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J/AJ/118/346        M31D eclipsing binaries and Cepheids        (Kaluzny+ 1999)

DIRECT distances to nearby galaxies using detached eclipsing binaries and Cepheids. IV. Variables in the field M31D. Kaluzny J., Mochejska B.J., Stanek K.Z., Krockenberger M., Sasselov D.D., Tonry J.L., Mateo M. <Astron. J. 118, 346 (1999)> =1999AJ....118..346K
ADC_Keywords: Stars, variable ; Binaries, eclipsing ; Photometry Keywords: binaries: close - Cepheids - distance scale - galaxies: individual (M31) - stars: variables: other Abstract: We undertook a long-term project, DIRECT, to obtain the direct distances to two important galaxies in the cosmological distance ladder - M31 and M33 - using detached eclipsing binaries (DEBs) and Cepheids. While rare and difficult to detect, DEBs provide us with the potential to determine these distances with an accuracy better than 5%. The extensive photometry obtained in order to detect DEBs provides us with good light curves for the Cepheid variables. These are essential to the parallel project to derive direct Baade-Wesselink distances to Cepheids in M31 and M33. For both Cepheids and eclipsing binaries, the distance estimates will be free of any intermediate steps. As a first step in the DIRECT project, between 1996 September and 1997 October we obtained 95 full/partial nights on the F. L. Whipple Observatory 1.2 m telescope and 36 full nights on the Michigan-Dartmouth-MIT 1.3 m telescope to search for DEBs and new Cepheids in the M31 and M33 galaxies. In this paper, the fourth in the series, we present the catalog of variable stars, most of them newly detected, found in the field M31D [(RA, DE)=(11.03°, 41.27°), J2000.0]. We have found 71 variable stars: five eclipsing binaries, 38 Cepheids, and 28 other periodic, possible long-period or nonperiodic variables. The catalog of variables, as well as their photometry and finding charts, is available via anonymous ftp and the World Wide Web. The complete set of the CCD frames is available upon request. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 71 5 DIRECT eclipsing binaries in M31D table2.dat 68 38 DIRECT Cepheids in M31D table3.dat 78 15 DIRECT other periodic variables in M31D table4.dat 71 13 DIRECT miscellaneous variables in M31D
See also: http://cfa-www.harvard.edu/~kstanek/DIRECT : DIRECT project J/AJ/115/1894 : M31A eclipsing binaries and Cepheids (Stanek+ 1998) J/AJ/115/1016 : M31B eclipsing binaries and Cepheids (Kaluzny+ 1998) J/AJ/117/2810 : M31C eclipsing binaries and Cepheids (Stanek+, 1999) J/AJ/118/2211 : M31F eclipsing binaries and Cepheids (Mochejska+ 1999) J/AJ/122/1383 : DIRECT BVI photometry in M31 (Mochejska+, 2001) J/A+AS/126/401 : M 31 Cepheids periods (Magnier+ 1997) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 A11 --- M31D Variable name (DIRECT VNNNN M31D in Simbad) 13- 19 F7.4 deg RAdeg Right ascension (J2000.0) 21- 27 F7.4 deg DEdeg Declination (J2000.0) 29- 35 F7.4 d Per Period 37- 41 F5.2 mag Vmax Maximum Johnson V magnitude 43- 47 F5.2 mag Imax ? Maximum Cousins I magnitude 49- 53 F5.2 mag Bmax Maximum Johnson B magnitude 55- 58 F4.2 --- R1 First component radius (1) 60- 63 F4.2 --- R2 Second component radius (1) 65- 66 I2 deg i Inclination angle 68- 71 F4.2 --- e Ellipticity
Note (1): in orbital separation units
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 11 A11 --- M31D Variable name (DIRECT VNNNN M31D in Simbad) 13- 19 F7.4 deg RAdeg Right ascension (J2000.0) 21- 27 F7.4 deg DEdeg Declination (J2000.0) 29- 34 F6.3 d Per Period 36- 40 F5.2 mag <Vmag> Flux-weighted mean Johnson V magnitude 42- 46 F5.2 mag <Imag> ? Flux-weighted mean Cousins I magnitude 48- 52 F5.2 mag <Bmag> ? Flux-weighted mean Johnson B magnitude 54- 57 F4.2 mag A V-band amplitude of the variation 59- 68 A10 --- Com Comments (1)
Note (1): V7122 D31D (Ma97 75) was found in Paper III (Cat. J/AJ/117/2810) as V7557 D31C, with P=16.726 days, <V≥20.85, <I≥19.14, and B=21.98 V5565 D31D was found as V3277 D31C, with P=17.599 days, <V≥21.02, <I≥19.60, and B=22.29, V7483 D31D was found in Paper III (Cat. J/AJ/117/2810) as V9029 D31C, with P=35.861 days, <V≥20.31, <I≥18.62, and B=21.39.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 11 A11 --- M31D Variable name (DIRECT VNNNN M31D in Simbad) 13- 19 F7.4 deg RAdeg Right ascension (J2000.0) 21- 27 F7.4 deg DEdeg Declination (J2000.0) 29- 33 F5.1 d Per Period 35- 39 F5.2 mag Vmag Error-weighted mean Johnson V magnitude 41- 45 F5.2 mag Imag ? Error-weighted mean Cousins I magnitude 47- 51 F5.2 mag Bmag ? Error-weighted mean Johnson B magnitude 53- 56 F4.2 mag e_Vmag Standard deviation in Johnson V band 58- 61 F4.2 mag e_Imag ? Standard deviation in Cousins I band 63- 66 F4.2 mag e_Bmag ? Standard deviation in Johnson B band 68- 78 A11 --- Com Comments (1)
Note (1): Variables V7280 and V4627 were also found in Paper III (Cat. J/AJ/117/2810).
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 11 A11 --- M31D Variable name (DIRECT VNNNN M31D in Simbad) 13- 19 F7.4 deg RAdeg Right ascension (J2000.0) 21- 27 F7.4 deg DEdeg Declination (J2000.0) 29- 33 F5.2 mag Vmag Mean Johnson V magnitude 35- 39 F5.2 mag Imag ? Mean Cousins I magnitude 41- 45 F5.2 mag Bmag ? Mean Johnson B magnitude 47- 50 F4.2 mag e_Vmag Standard deviation in Johnson V band 52- 55 F4.2 mag e_Imag ? Standard deviation in Cousins I band 57- 60 F4.2 mag e_Bmag ? Standard deviation in Johnson B band 62- 71 A10 --- Com Comments (1)
Note (1): Variables V5309 and V5323 were also found in Paper III (Cat. J/AJ/117/2810).
History: * 14-Sep-1999: From AJ electronic version * 11-Aug-2012: removed incomplete tables 5--8
(End) James Marcout, Patricia Bauer [CDS] 14-Sep-1999
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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