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 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, =20.85, =19.14, and B=21.98
V5565 D31D was found as
V3277 D31C, with P=17.599 days, =21.02, =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, =20.31, =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