J/AJ/126/175 M31Y eclipsing binaries and Cepheids (Bonanos+, 2003)
DIRECT distances to nearby galaxies using detached eclipsing binaries and
Cepheids. IX. Variables in the field M31Y discovered with image subtraction.
Bonanos A.Z., Stanek K.Z., Sasselov D.D., Mochejska B.J., Macri L.M.,
Kaluzny J.
<Astron. J. 126, 175 (2003)>
=2003AJ....126..175B 2003AJ....126..175B
ADC_Keywords: Binaries, eclipsing ; Stars, variable ; Photometry, UBVRI
Stars, diameters
Keywords: binaries: eclipsing - Cepheids - distance scale -
galaxies: individual (M31) - stars: variables: other
Abstract:
The DIRECT Project aims to obtain direct distances to two Local Group
galaxies, M31 and M33, which occupy a crucial position near the base
of the cosmological distance ladder. The first step is to search for
detached eclipsing binaries (DEBs) and Cepheids using 1m class
telescopes to select good candidates, which will be followed up
spectroscopically on 6.510m class telescopes. In this ninth paper, we
present a catalog of variable stars discovered with image subtraction
in field M31Y (RA=10.97°, DE=41.69°; J2000.0). The data were
obtained with the Fred Lawrence Whipple Observatory 1.2m telescope on
25 nights, over a period of 6 months. In our search covering 22x22,
we discovered 41 eclipsing binaries, 126 Cepheids, and 97 other
periodic or nonperiodic variables, including a luminous blue variable
candidate, a nova, and a Galactic cataclysmic variable. The catalog of
variables, as well as their photometry and finding charts, is
available electronically via anonymous ftp and the World Wide Web, at
http://cfa-www.harvard.edu/~kstanek/DIRECT . The complete set of the
CCD frames is available upon request.
Description:
The data for M31 field Y was taken with the 1.2m telescope at the
Fred Lawrence Whipple Observatory (FLWO) on Mount Hopkins, Arizona,
between 1999 July 19 and 2000 January 2, over 25 nights.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 98 41 DIRECT Eclipsing Binaries in M31Y
table3.dat 54 7217 Light Curves of Eclipsing Binaries in M31Y
table4.dat 76 126 DIRECT Cepheids in M31Y
table5.dat 54 22314 Light Curves of Cepheids in M31Y
table6.dat 62 48 DIRECT Other Periodic Variables in M31Y
table7.dat 54 8552 Light Curves of Other Periodic Variables in M31Y
table8.dat 49 49 DIRECT Miscellaneous Variables in M31Y
--------------------------------------------------------------------------------
See also:
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/118/346 : M31D eclipsing binaries and Cepheids (Kaluzny+ 1999)
J/AJ/118/2211 : M31F eclipsing binaries and Cepheids (Mochejska+ 1999)
J/AJ/122/1383 : DIRECT BVI photometry in M31 (Mochejska+, 2001)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [D31]
4- 21 A18 --- D31 Object name (JHHMMSS.s+DDMMSS.s)
23- 29 F7.5 d Per Period
31- 35 F5.2 mag Bmag ? Maximum Johnson B-band magnitude outside of eclipse
37- 41 F5.2 mag Vmag ? Maximum Johnson V-band magnitude outside of eclipse
43- 47 F5.2 mag Imag ? Maximum Johnson I-band magnitude outside of eclipse
49- 52 F4.2 --- Rad1 ? Primary radius in units of orbital separation (1)
54- 57 F4.2 --- Rad2 ? Secondary radius in units of orbital separation (1)
59- 63 F5.2 deg Inc ? Inclination angle (1)
65- 68 F4.2 --- Ecc ? Eccentricity (1)
70- 84 A15 --- Com Additional comments
--------------------------------------------------------------------------------
Note (1): Determined from a simple model of the eclipsing system, so values
should be treated only as reasonable estimates of the ``true'' values.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat table5.dat table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [D31]
4- 21 A18 --- D31 Object name (JHHMMSS.s+DDMMSS.s)
23 A1 --- Filter Filter passband (1)
25- 36 F12.4 d Obs.D Julian Date of observation (HJD)
38- 47 F10.3 --- Data Observed magnitude or differential flux
49- 55 F7.3 --- e_Data Uncertainty in Data
--------------------------------------------------------------------------------
Note (1): Filter passbands as follows:
B = Indicates Data is the Johnson B passband magnitude
V = Indicates Data is the Johnson V passband magnitude
I = Indicates Data is the Johnson I passband magnitude
b = Indicates Data is the Johnson B passband differential flux
v = Indicates Data is the Johnson V passband differential flux
i = Indicates Data is the Johnson I passband differential flux
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [D31]
4- 21 A18 --- D31 Object name (JHHMMSS.s+DDMMSS.s)
23- 29 F7.4 d Per Period
31- 34 F4.2 mag AV ? The V-band amplitude
36- 40 F5.2 mag Vmag ? Flux-weighted average Johnson V-band magnitude
42- 46 F5.2 mag Imag ? Flux-weighted average Johnson I-band magnitude
48- 52 F5.2 mag Bmag ? Flux-weighted average Johnson B-band magnitude
54- 76 A23 --- Com Additional comments
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [D31]
4- 21 A18 --- D31 Object name (JHHMMSS.s+DDMMSS.s)
23- 30 F8.4 d Per Period
32- 36 F5.2 mag Vmag Flux-weighted average Johnson V-band magnitude
38- 42 F5.2 mag Imag ? Flux-weighted average Johnson I-band magnitude
44- 48 F5.2 mag Bmag ? Flux-weighted average Johnson B-band magnitude
50- 62 A13 --- Com Additional comments
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table8.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [D31]
4- 21 A18 --- D31 Object name (JHHMMSS.s+DDMMSS.s)
23- 27 F5.2 mag Vmag ? The average Johnson V-band magnitude
29- 33 F5.2 mag Imag ? The average Johnson I-band magnitude
35- 39 F5.2 mag Bmag ? The average Johnson B-band magnitude
41- 49 A9 --- Com Additional comments
--------------------------------------------------------------------------------
History:
* 26-Sep-2003: From electronic version of the journal
* 21-Dec-2005: Corrected all D31 names: 2 zeroes are required for 00h.
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 26-Sep-2003