PHOTOELECTRIC OBSERVATIONS OF VARIABLE STARS JOHN B. PRISER* Lowell Observatory Flagstaff, Arizona INTRODUCTION Twenty-eight variable and suspected variable stars were chosen for observation (see Table No. 1) from the "General Catalogue of Variable Stars". An attempt was made to choose stars of questionable classification and also to include some semi-regular and irregular variables which had not been well observed. The stars were also chosen for favorable positions in the sky for the observing period involved. EQUIPMENT All observations were made with the Lowell Observatory 21-inch reflector and other photoelectric equipment used for the Solar Variation Program. This equipment includes a photometer with a 1P21, standard B and V filters, a GR 1230 DC amplifier, and a Brown recorder. OBSERVATIONS The 1P21 was cooled with dry ice at least two hours prior to the beginning of observations, and dry ice was added each two hours thereafter during the night. Every six or eight weeks the amplifier was calibrated in half and two and a half magnitude steps (Serkowski, 1961). The deflections were recorded on a Brown recorder strip-chart potentiometer in the sequence B, sky B, V, sky V; these were followed by observations of a radioactive source and the dark current. Many primary and secondary UBV standard stars were observed at various air masses throughout the night (Johnson and Harris, 1954) in order to determine the extinction and color corrections. No observations were made within three days of full moon and no observations were attempted if clouds were suspected. REDUCTIONS The reductions were made by means of the formulae and least-squares method described by Serkowski (1961) *Presently at the Flagstaff Station of the U. S. Naval Observatory. LIGHT CURVES Drawings showing B, V, and B-V data are given (Figures 1-17) for 17 of the 28 stars observed. Only the most interesting data are shown. The B observations are shown by filled circles, the V observations by the open circles, and the B-V color points below. DESCRIPTION OF TABLE AND FIGURES Table No. 1 lists all stars observed. The first four columns list the star names, the type of variable, the period and the spectral types as given in the "General Catalogue of Variable Stars" (second edition). The fifth and sixth columns list the observed B-V values at maximum and minimum light. Figure 18 is a B-V vs. spectral type diagram for the 28 stars. The long dashed line represents the main-sequence and the small dashed line below the yellow giants according to Johnson and Morgan (1953). Most of the variables plotted appear to lie close to the giant sequence if one assumes that the giant branch crosses the main-sequence at approximately B-V = + 1.6. Figure 19 is the observed color B-V amplitude vs. the visual V magnitude amplitude. This indicates that a large amplitude in brightness necessitates a large color change for this group of stars. Figure 20 shows the relation between the log of the period and color at minimum light, after Kron and Svolopoulas (1959) and transformed to the B, V system. The small filled circles to the left indicate 25 galactic cepheid variables observed at minimum light by Eggen, Gascoigne, and Burr (1957) and transformed here to B-V. The open circles to the right show the 12 semiregular variables observed at minimum light by Smak (1964). The large filled circles to the right are observations from this paper where a period could be found. The author extends thanks to John S. Hall, G. E. Kron and K. Serkowski for their help in writing this paper. September 14, 1967 TABLE NO. 1 From "General Catalogue Present observations of Variable Stars" B-V at Name Second Edition type period spect. maximum light minimum light W BOO ? M3 1.70 - Y BOO cst? K0 III 1.05 - RX BOO SRb (210+-) M7e-8e 1.76 1.79 BY BOO cst? F6-IV .44 - UV BOO Ia F5 .41 - X CNC SRb 170+- N3(C5_4) 3.39 3.24 RS CNC SRc? 120 M6 1.70 1.66 RT CNC SRb 90 M5 III 1.56 1.46 V CVN SRa 191.88 M4e-M6e 1.51 1.60 TU CVN Ib (50+-) M6 1.62 1.58 TW COM Ib K5 1.51 1.42 VW GEM Ib N(C3_9) 2.44 2.48 BN GEM Ia? O8V : pe -.12 - BQ GEM ? (50+-) M4 1.64 1.61 VV LEO SR 181.5 M7 1.82 1.84 WX LEO Ib M5 1.54 1.46 AI LEO Ib M5 1.79 1.66 AK LEO Ib (60+-) M5 1.49 1.52 SV LYN SR? (70+-) gM5 1.56 1.61 ST UMA SRb 81 M4 III 1.67 1.63 TV UMA SRb 50.38 M5 III 1.54 1.52 SW VIR SRb 150+- M7 1.80 1.76 BG VIR I ? (50+-) M5 1.50 1.48 BK VIR Ib (150+-) M7 1.62 1.63 CN VIR Ib (60+-) M3 1.68 1.63 CO VIR Ib (70+-) M5 1.57 1.55 CP VIR ?I M7 1.55 1.46 CQ VIR Ib M3 1.71 1.60 Those periods given in parentheses () above are estimated from the observations here. NOTES TO TABLE 1. W BOO: Listed as ? Observations here still leave doubt as to variability. Y BOO: Listed as cst? Observations here indicate it is probably not variable. RX BOO: Listed as SRb. Light curves appear to confirm this classification. Period 210d+-. See Fig. 1. RY BOO: Listed as cst? Eighteen observations here indicate it probably is not variable. UV BOO: Listed as Ia. Sixteen observations here indicate it is probably not variable. X CNC: Listed as SRb: Light curves appear to confirm this classification. See Fig. 2. RS CNC: Appears to be as listed (SRc), but with a 160 (+-) day period. See Fig. 3. RT CNC: Appears to be as listed (SRb), with a period for these observations of 140d. Note how the B-V changed (bluer) as the star passed through minimum light. See Fig. 4. V CVN: Listed as SRa with period of 191.88d. These observations confirm the above. See Fig. 5. TU CVN: Listed as Ib. Light curve here appears to suggest SRb with period of 50d+-. See Fig. 6. TW COM: Listed as Ib. Too few observations here. VW GEM: Too few observations here. BN GEM: Listed as Ia? Twenty-two observations here indicate it probably not variable. BQ GEM: Type listed as ? The light curves here indicate an SRb type with a period of 50 days (+-). See Fig. 7. VV LEO: Too few observations here. WX LEO: Too few observations here. AI LEO: Listed as Ib, light curves here indicate an SRb type with too few observations to determine a period. See Fig. 8. AK LEO: Listed as Ib, light curve here suggests it may be SRb with period of 60d+-. See Fig. 9. SV LYN: Listed as SR? Observations here indicate type SRb with a period of 70 days (+-). See Fig. 10. ST UMA: Type listed as SRb with a period of 81 days. Observations here confirm the type, but the period appears to be longer (~90d). See Fig. 11. TV UMA: Listed as SRb with period of 50.38 days, observations here confirm the type but the average period (~42d) appears to be shorter. See Fig. 12. SW VIR: Type listed as SRb with period of 150 days (+-). Too few observations here to confirm. See Fig. 13. BG VIR: Listed as type I? Observations here indicate this star may be type SRb with a period of 50 days(+-). See Fig. 14. BK VIR: Listed as type Ib. Observations here indicate an SRb star with a period of 150d+-. See Fig. 15. CN VIR: Type listed is Ib. Observations here suggest an SRb star with a period of 60d+-. See Fig. 16. CO VIR: Listed as type Ib. Too few observations to confirm this classification. CP VIR: Listed as type ?I. Observations here indicate an SRb type with a period of ~70 days. See Fig. 17. CQ VIR: Type listed as Ib. Observation here suggest an SRb star with too few observations to determine a period. STAR REFERENCES W BOO - E. Mendoza, Tonantzintla Bol. 28, 4, 1967 AAVSO Quarterly Reports P. Ahnert, MVS No 109, 1947 Y BOO - AAVSO Quarterly Reports RY BOO - Kuibyshev Astro. Obs. VS Bull 14, 1962 AAVSO Quarterly Reports RN BOO - AAVSO Quarterly Reports UV BOO - AAVSO Quarterly Reports P. Ahnert, MVS, 109, 1947 N CNC - E. Mendoza, Tonantzintla Bol. 28, 4, 1967 AAVSO Quarterly Reports LANDOLT, A. U., P.A.S.P., 78, 531. RS CNC - AAVSO Quarterly Reports Japan. Astr. Study Assoc. Circ. 182-3, 1958 RT CNC - AAVSO Quarterly Reports V CVN - Rep. No. 4 Groningen, Kapteyn Astro. Lab. 1963 AAVSO Quarterly Reports LANDOLT, A. U., 1966, P.A.S.P., 78, 531. TU CVN - AAVSO Quarterly Reports TW COM - M. Beyer, Erg. AN 12, 2, 1950 VW GEM - AAVSO Quarterly Reports M. Beyer, AN 263, 33, 1937 BN GEM - Kuibyshev Astro. Obs. VS Bull 14, 1962 AAVSO Quarterly Reports C. Hoffmeister, AN 253, 195, 1934 BQ GEM - Kuibyshev Astron. Obs. VS Bull 14, 1962 AAVSO Quarterly Reports J. Stebbins, C. M. Huffer, Washb. Publ. 15, 3, 1928 VV LEO - M. Esch, AN 264, 64, 1937 WX LEO - S. Bohme, AN 266, 169, 1938 AI LEO - M. Beyer, Erg AN 12, 2, 1950 AK LEO - M. Beyer, Erg AN 12, 2, 1950 SV LYN - A. B. Conosbee, AII, 159, 1955 ST UMA - Groningen Nr. 5, 6, Kapteyn Astro. Lab. 1964 AAVSO Quarterly Reports E. Loreta, AN 267, 397, 1939 LANDOLT, A. U., 1966, P.A.S.P., 78, 531. TV UMA - AAVSO Quarterly Reports C. Payne-Gaposchkin, HA 118, 13, 1952 SW VIR - AAVSO Quarterly Reports C. Payne-Gaposchkin, HA 115, 26, 1950 BG VIR - C. Hoffmeister, AN 255, 401, 1935 BK VIR - AAVSO Quarterly Reports M. Beyer, Erg AN 12, 2, 1950 CN VIR - AAVSO Quarterly Reports M. Beyer, Erg AN 12, 2, 1950 CO VIR - AAVSO. Quarterly Reports M. Beyer, Erg AN 12, 2, 1950 CP VIR - H. Sandig, AN 276, 173, 1948 CQ VIR - M. Beyer, Erg AN 12, 2, 1950 OBSERVATIONS W BOO Date J. D. 1963 B V 2,438,051 Jan. 21 6.44 4.77 053 23 6.45 4.76 055 25 6.46 4.79 064 Feb. 3 6.49 4.82 067 6 6.44 4.77 082 21 6.45 4.79 096 Mar. 7 6.43 4.73 109 20 6.43 4.74 124 Apr. 4 6.46 4.78 163 May 13 6.43 4.77 186 June 5 6.45 4.79 Y BOO Date D. 1963 B V 2,438,055 Jan. 25 8.98 7.95 058 28 8.98 7.95 064 Feb. 3 8.98 7.95 067 6 8.98 7.95 082 21 8.96 7.94 085 24 8.98 7.95 096 Mar. 7 8.97 7.93 109 20 8.98 7.94 124 Apr. 4 8.99 7.95 162 May 12 8.98 7.96 166 16 8.98 7.96 RX BOO Date J. D. 1963 B V 2,438,053 Jan. 23 9.53 7.72 055 25 9.54 7.76 058 28 9.51 7.75 064 Feb. 3 9.55 7.76 007 6 9.50 7.72 082 21 9.40 7.64 096 Mar. 7 9.34 7.57 109 20 9.29 7.53 124 Apr. 4 9.32 7.59 149 29 9.58 7.84 162 May 12 9.74 8.00 166 16 9.79 8.02 171 21 9.83 8.06 174 24 9.86 8.06 179 29 9.89 8.11 186 June 5 9.91 8.12 191 10 9.91 8.11 194 13 9.88 8.12 RY BOO Date J.D. 1962 B V 2,438,021 Dec. 22 7.56 7.12 029 30 7.56 7.12 1963 037 Jan. 7 7.55 7.12 039 9 7.56 7.12 045 15 7.56 7.13 047 17 7.56 7.12 051 21 7.59 7.15 053 23 7.56 7.12 064 Feb. 3 7.60 7.16 067 6 7.56 7.12 082 21 7.56 7.12 085 24 7.56 7.13 096 Mar. 7 7.56 7.12 109 20 7.58 7.15 124 Apr. 4 7.60 7.15 153 May 3 7.56 7.12 162 12 7.58 7.14 166 16 7.56 7.13 UV BOO Date J. D. 1963 B V 2,438,045 Jan. 15 8.55 8.14 047 17 8.55 8.14 051 21 8.55 8.14 053 23 8.55 8.13 055 25 8.54 8.14 058 28 8.55 8.14 064 Feb. 3 8.56 8.15 067 6 8.55 8.13 082 21 8.54 8.12 096 Mar. 7 8.56 8.14 109 20 8.56 8.16 124 Apr. 4 8.58 8.14 149 29 8.55 8.14 162 May 12 8.55 8.14 166 16 8.55 8.14 179 29 8.54 8.11 X CNC Date J. D. 1962 B V 2,437.970 Nov. 1 10.14 6.80 971 2 10.15 6.91 972 3 10.17 6.89 974 5 10.20 6.96 977 8 10.19 6.95 980 11 10.21 6.98 992 23 10.23 6.98 996 27 10.26 7.02 2,438,003 Dec. 4 10.24 7.00 005 6 10.24 6.99 007 8 10.23 7.00 021 22 10.16 6.88 029 30 10.10 6.82 1963 039 Jan. 9 10.05 6.55 045 15 9.94 6.42 047 17 9.89 6.44 051 21 9.87 6.42 053 23 9.83 6.37 058 28 9.79 6.35 2,438,064 Feb. 3 9.72 6.30 067 6 9.70 6.28 077 16 9.65 6.26 082 21 9.66 6.27 104 Mar. 15 9.78 6.31 132 Apr. 12 9.80 6.41 145 25 9.77 6.39 153 May 3 9.68 6.39 163 13 9.62 6.34 RS CNC Date J. D. 1962 B V 2,437,970 Nov. 1 7.27 - 971 2 7.27 5.67 972 3 7.28 5.66 974 5 7.30 5.67 977 8 7.31 5.67 979 10 7.31 5.70 980 11 7.35 5.71 996 27 7.42 5.78 2,438,003 Dec. 4 7.48 5.86 005 6 7.50 5.85 007 8 7.49 5.85 020 21 7.63 5.99 021 22 7.64 6.00 029 30 7.68 6.04 1963 039 Jan. 9 7.71 6.05 045 15 7.68 6.03 047 17 7.60 5.99 051 21 7.57 5.95 053 23 7.53 5.89 055 25 7.48 5.86 064 Feb. 3 7.30 5.68 067 6 7.25 5.64 077 16 7.09 5.47 080 19 7.08 5.44 082 21 7.01 5.40 086 25 6.93 5.30 104 Mar. 15 6.77 5.1 2,438,109 Mar. 20 6.76 5.06 132 Apr. 12 7.17 5.50 143 23 7.35 5.68 145 25 7.38 5.70 149 29 7.45 5.74 153 May 3 7.48 5.82 162 12 7.55 5.91 163 13 7.57 5.89 166 16 7.60 5.91 179 29 7.72 6.03 RT CNC Date J. D. 1962 B V 2,437,974 Nov. 5 9.09 7.57 977 8 9.10 7.58 979 10 9.11 - 980 11 9.12 7.59 992 23 9.13 7.59 996 27 9.06 7.54 2,438,003 Dec. 4 9.04 7.50 005 6 9.00 7.44 007 8 8.99 7.44 021 22 9.06 7.48 029 30 9.13 7.55 1963 039 Jan. 9 9.18 7.61 045 15 9.21 7.70 047 17 9.20 7.72 051 21 9.26 7.78 052 23 9.30 7.80 055 25 9.33 7.83 064 Feb. 3 9.37 7.90 067 6 9.36 7.90 077 16 9.27 7.80 082 21 9.17 7.71 086 25 9.10 7.63 104 Mar. 15 9.11 7.58 132 Apr. 12 8.97 7.41 143 23 8.93 7.36 145 25 8.93 7.36 153 May 3 8.92 7.36 163 13 8.95 7.38 166 16 8.97 7.39 V CVN Date J. D. 1962 B V 2,438,005 Dec. 6 8.86 7.20 021 22 9.05 7.39 029 30 9.26 7.58 1963 037 Jan. 7 9.57 7.92 039 9 9.65 8.02 045 15 9.82 8.16 047 17 9.83 8.19 051 21 9.89 8.24 053 23 9.90 8.25 055 25 9.90 8.27 058 28 9.88 8.28 064 Febr. 3 9.81 8.21 067 6 9.79 8.18 082 21 9.81 8.20 124 Apr. 4 8.90 7.41 145 25 8.54 7.03 162 May 12 8.66 7.19 166 16 8.65 7.18 179 29 8.68 7.21 186 June 5 8.79 7.31 TU CVN Date J. D. 1962 B V 2,438,005 Dec. 6 7.33 5.75 020 21 7.33 5.77 029 30 7.25 5.68 1963 037 Jan. 7 7.28 5.70 039 9 7.27 5.69 045 15 7.34 5.75 047 17 7.32 5.74 051 21 7.33 5.74 053 23 7.31 5.71 055 25 7.30 5.71 058 28 7.27 5.69 064 Feb. 3 7.27 5.68 067 6 7.26 5.67 082 21 7.37 5.78 096 Mar. 7 7.36 5.75 2,438,104 Mar. 15 7.17 5.57 109 20 7.17 5.55 124 Apr. 4 7.37 5.78 132 12 7.41 5.83 143 23 7.30 5.73 149 29 7.29 5.70 151 May 1 7.28 5.70 153 3 7.28 5.70 162 12 7.29 5.71 163 13 7.28 5.69 166 16 7.26 5.67 174 24 7.24 5.65 179 29 7.26 5.69 186 June 5 7.34 5.76 194 13 7.32 5.76 TW COM Date J. D. 1963 B V 2,438,051 Jan. 21 11.25 9.77 053 23 11.24 9.82 055 25 11.28 9.82 058 28 11.26 9.78 064 Feb. 3 11.18 9.69 124 Apr. 4 10.95 9.44 143 23 11.33 9.90 162 May 12 11.10 9.64 VW GEM Date J. D. 1962 B V 2,437,979 Nov. 10 11.00 8.52 2.438,007 Dec. 8 10.88 8.42 021 22 10.82 8.39 1963 047 Jan. 17 10.74 8.32 053 23 10.72 8.27 064 Feb. 3 10.75 8.33 077 16 10.76 8.35 082 21 10.81 8.39 BN GEM Date J. D. 1962 B V 2.437,970 Nov. 1 6.63 - 971 2 6.64 6.78 972 3 6.63 6.79 974 5 6.64 6.81 977 8 6.63 6.79 992 23 6.62 6.78 995 26 6.64 6.76 996 27 6.64 6.77 2,438,003 Dec. 4 6.62 6.77 005 6 6.62 6.75 007 8 6.63 6.76 021 22 6.64 6.77 1963 047 Jan. 17 6.64 6.79 051 21 6.65 6.79 053 23 6.64 6.79 064 Febr. 3 6.64 6.79 077 16 6.63 6.77 082 21 6.63 6.76 104 Mar. 15 6.61 6.76 132 Apr. 12 6.63 6.75 145 25 6.61 6.74 153 May 3 6.64 6.76 BQ GEM Date J. D. 1962 B V 2,437,972 Nov. 3 6.80 - 977 8 6.81 5.19 979 10 6.83 5.20 980 11 6.84 5.21 992 23 6.93 - 995 26 6.93 5.31 996 27 6.94 5.34 2,438,003 Dec. 4 6.94 5.32 005 6 6.92 5.29 007 8 6.92 5.27 021 22 6.77 5.13 1963 047 Jan. 17 6.81 5.19 051 21 6.80 5.15 053 23 6.78 5.14 2,438,064 Feb. 3 6.72 5.07 077 16 6.63 4.98 080 19 6.73 5.04 082 21 6.68 5.04 104 Mar. 15 6.93 5.27 132 Apr. 12 6.72 5.05 145 25 6.90 5.23 153 May 3 7.01 5.33 VV LEO Date J. D. 1962 B V 2,438,021 Dec. 22 11.78 10.07 1963 047 Jan. 17 11.73 10.00 051 21 11.79 9.97 053 23 11.80 9.98 058 28 11.85 10.01 082 Feb. 21 12.05 10.21 WX LEO Date J. D. 1963 B V 2,438,051 Jan. 21 9.89 8.39 053 23 9.93 8.44 055 25 9.97 8.48 058 28 9.99 8.46 064 Febr. 3 9.96 8.50 067 6 9.95 8.48 124 Apr. 4 9.56 8.05 163 May 13 9.59 8.06 166 16 9.57 8.04 186 June 5 9.48 7.94 AI LEO Date J. D. 1963 B V 2,438,047 Jan. 17 10.23 8.44 051 21 10.26 8.50 053 23 10.29 8.50 055 25 10.32 8.54 058 28 10.36 8.59 082 Feb. 21 10.66 8.93 109 Mar. 20 11.85 9.13 143 Apr. 23 11.09 9.38 162 May 12 11.11 9.45 163 13 11.13 9.44 166 16 11.13 9.42 174 24 11.02 9.31 179 29 10.88 9.18 194 June 13 10.43 8.69 AK LEO Date J. D. 1962 B V 2.438,003 Dec. 4 10.25 8.72 005 6 10.24 8.68 007 8 10.25 8.68 009 10 10.21 8.71 020 21 10.19 8.70 021 22 10.19 8.66 029 30 10.23 8.75 1963 037 Jan. 7 10.26 8.77 039 9 10.26 8.78 045 15 10.28 8.78 047 17 10.28 8.78 051 21 10.33 8.81 053 23 10.35 8.82 055 25 10.36 8.83 058 28 10.38 8.85 064 Feb. 3 10.39 8.87 067 6 10.38 8.89 082 21 10.38 8.88 109 Mar. 20 10.15 8.67 124 Apr. 4 10.53 9.00 132 12 10.25 8.71 143 23 10.29 8.77 145 25 10.27 8.74 2,438,149 Apr. 29 10.22 8.69 151 May 1 9.85 8.36 162 12 10.03 8.54 163 13 10.09 8.54 166 16 10.09 8.54 174 24 10.13 8.59 179 29 10.12 8.62 186 June 5 10.06 8.54 194 13 10.01 8.49 SV LYN Date J. D. 1962 B V 2,437,972 Nov. 3 8.40 6.84 977 8 8.42 6.84 979 10 8.42 - 992 23 8.55 6.97 996 27 8.59 7.00 2,438,003 Dec. 4 8.60 7.06 005 6 8.59 7.01 007 8 8.59 - 021 22 8.67 7.09 1963 051 Jan. 21 8.51 6.89 053 23 8.51 6.89 058 28 8.42 6.85 064 Feb. 3 8.63 7.03 067 6 8.66 7.07 077 16 8.84 7.24 082 21 8.83 7.26 104 Mar. 15 8.55 6.92 132 Apr. 12 8.50 6.90 145 25 8.65 7.06 153 May 3 8.63 7.03 162 12 8.58 7.00 163 13 8.59 6.96 166 16 8.60 6.94 ST UMA Date J. D. 1962 B V 2,438,003 Dec. 4 8.55 6.92 005 6 - 6.89 009 10 8.42 6.82 020 21 8.20 6.57 021 22 8.18 6.51 209 30 8.15 6.48 1963 037 Jan. 7 8.18 6.50 039 9 8.18 6.53 045 15 8.21 6.57 047 17 8.22 6.59 051 21 8.30 6.65 053 23 8.32 6.67 055 25 8.37 6.74 058 28 8.42 6.77 064 Feb. 3 8.50 6.89 067 6 8.55 6.94 082 21 8.60 6.97 086 25 8.56 6.94 087 26 8.55 6.94 096 Mar. 7 8.44 6.81 104 15 8.34 6.70 109 20 8.28 6.63 123 Apr. 3 8.24 6.58 124 4 8.22 6.56 132 12 8.18 6.54 143 23 8.23 6.59 145 25 8.23 6.58 149 29 8.24 6.59 151 May 1 8.25 6.60 153 3 8.25 6.61 160 10 8.23 6.60 162 12 8.21 6.61 163 13 8.24 6.61 166 16 8.22 6.58 174 24 8.21 6.53 179 29 8.15 6.55 186 June 5 8.22 6.56 194 13 8.19 6.54 TV UMA Date J. D. 1962 B V 2.438,003 Dec. 4 8.66 7.13 005 6 8.61 7.06 009 10 8.54 7.03 020 21 8.70 7.20 021 22 8.71 7.18 029 20 8.81 7.28 1963 037 Jan. 7 8.75 7.24 039 9 8.73 7.22 045 15 8.74 7.22 047 17 8.73 7.21 051 21 8.78 7.26 053 23 8.78 7.25 - 25 8.79 7.27 058 28 8.79 7.28 064 Feb. 3 8.81 7.29 067 6 8.80 7.29 082 21 8.59 7.04 086 25 8.59 7.04 087 26 8.58 7.03 096 Mar. 7 8.64 7.11 104 15 8.67 7.15 109 20 8.65 7.13 124 Apr. 4 8.41 6.85 132 12 8.49 6.95 143 23 8.64 7.14 145 25 8.66 7.14 149 29 8.70 7.18 151 May 1 8.73 7.22 153 3 8.74 7.24 160 10 8.72 7.22 162 12 8.70 7.19 163 13 8.69 7.16 166 16 8.63 7.11 174 24 8.48 6.93 179 29 8.36 6.83 186 June 5 8.29 6.75 194 13 8.33 6.78 SW VIR Date J. D. 1963 B V 2,438,051 Jan. 21 8.64 6.90 053 23 8.63 6.88 055 25 8.63 6.89 058 28 8.61 6.88 064 Feb. 3 8.62 6.87 067 6 8.62 6.87 082 21 8.64 6.86 096 Mar. 7 8.59 6.82 109 20 8.61 6.82 124 Apr. 4 8.79 7.02 144 24 8.92 7.17 149 29 8.96 7.19 151 May 1 8.96 7.20 153 3 8.95 7.19 162 12 8.94 7.20 163 13 8.93 7.17 166 16 8.92 7.15 179 29 8.89 7.13 194 June 13 8.90 7.14 BG VIR Date J. D. 1963 B V 2,438,064 Feb. 3 10.58 9.09 082 21 10.68 9.18 085 24 10.67 9.18 096 Mar. 7 10.52 9.01 109 20 10.58 9.04 124 Apr. 4 10.69 9.19 142 22 10.63 9.15 153 May 3 10.57 9.05 162 12 10.44 8.94 166 16 10.50 8.96 171 21 10.60 9.13 174 24 10.67 9.15 179 29 10.64 9.14 186 June 5 10.61 9.11 191 10 10.56 9.04 194 13 10.51 9.02 BK VIR Date J. D. 1963 B V 2,437,047 Jan. 17 9.75 8.12 051 21 9.80 8.15 053 23 9.74 8.10 055 25 9.74 8.14 058 28 9.80 8.18 064 Feb. 3 9.84 8.22 067 6 9.85 8.22 082 21 9.80 8.16 124 Apr. 4 8.92 7.30 132 12 8.89 7.28 143 23 8.90 7.28 149 29 8.96 7.32 151 May 1 8.96 7.34 162 12 9.10 7.51 163 13 9.13 7.50 166 16 9.18 7.55 174 24 9.31 7.65 179 29 9.36 7.74 186 June 5 9.44 7.79 194 13 9.54 7.88 CN VIR Date J. D. 1963 B V 2,438,047 Jan. 17 9.88 8.24 051 21 9.86 8.19 053 23 9.86 8.17 058 28 9.87 8.23 064 Feb. 3 9.98 8.32 067 6 10.02 8.39 082 21 10.13 8.49 124 Apr. 4 10.00 8.38 132 12 10.08 8.49 143 23 10.08 8.47 149 29 10.04 8.42 151 May 1 10.00 8.38 162 12 9.91 8.27 163 13 9.90 8.26 166 16 9.93 8.28 174 24 10.01 8.38 179 29 10.10 8.49 186 June 5 10.24 8.60 194 13 10.25 8.64 CO VIR Date J. D. 1963 B V 2,438,051 Jan. 21 10.56 9.01 053 23 10.57 9.02 056 25 10.58 9.06 058 28 10.61 9.07 064 Feb. 3 10.68 9.14 067 6 10.73 9.18 082 21 10.85 9.30 124 Apr. 4 10.67 9.13 151 May 1 10.66 9.11 162 12 10.57 9.02 163 13 10.55 9.01 166 16 10.51 8.97 179 29 10.35 8.80 186 June 5 10.33 8.76 194 13 10.40 8.83 CP VIR Date J. D. 1963 B V 2,438,051 Jan. 21 10.01 8.48 053 23 9.97 8.42 055 25 9.96 8.41 058 28 9.93 8.38 082 Feb. 21 10.18 8.66 096 Mar. 7 10.25 8.69 109 20 10.18 8.62 124 Apr. 4 10.02 8.45 142 22 10.07 8.53 143 23 10.09 8.53 144 24 10.11 8.56 149 29 10.17 8.63 151 May 1 10.22 8.67 153 3 10.23 8.69 162 12 10.37 8.91 163 13 10.38 8.89 166 16 10.37 8.90 179 29 10.31 8.86 180 June 5 10.16 8.63 194 13 10.09 8.52 CQ VIR Date J. D. 1963 B V 2,438,051 Jan. 21 10.76 9.06 053 23 10.74 9.03 055 25 10.75 9.05 064 Feb. 3 10.71 8.99 124 Apr. 4 11.02 9.35 162 May 12 11.24 9.64 166 16 11.25 9.64 174 24 11.22 9.59 179 29 11.23 9.64 186 June 5 11.21 9.57 194 13 11.09 9.51
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TEXT REFERENCES
Eggen, O. J., Gascoigne, S.C.B., and Burr, E. J., 1957, M.N.R.A.S., 117, 406.
Johnson, H. L. and Harris, D. L., 1954, Ap. J., 120, 196.
Johnson, H. J. and Morgan, W. W., 1953, Ap. J., 117, 313.
Kron, G. E. and Svolopoulas, S. N., 1959, P.A.S.P., 71, 126.
Serkowski, K., 1961, Lowell Bull., V, 157.
Smak, J., 1964, Ap. J. Supplement, 9, 159.