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J/A+A/509/A70    Study of an eclipsing binary in M31 (Vilardell+, 2010)

The distance to the Andromeda galaxy from eclipsing binaries. Vilardell F., Ribas I., Jordi C., Fitzpatrick E.L., Guinan E.F. <Astron. Astrophys. 509, A70 (2010)> =2010A&A...509A..70V
ADC_Keywords: Galaxies, nearby ; Binaries, eclipsing ; Radial velocities Keywords: stars: binaries: eclipsing - stars: fundamental parameters - stars: distances - cosmology: distance scale - galaxies: individual: M31 Abstract: The cosmic distance scale largely depends on distance determinations to galaxies of the Local Group. In this sense, the Andromeda galaxy (M31) is a key rung to better constrain the cosmic distance ladder. A project was started in 1999 to firmly establish a direct and accurate distance to M31 using eclipsing binaries (EBs). After the determination of the first direct distance to M31 from EBs, the second direct distance to an EB system is presented: M31V J00443610+4129194. Light and radial velocity curves were obtained and fitted to derive the masses and radii of the components. The acquired spectra were combined and disentangled to determine the temperature of the components. The analysis of the studied EB resulted in a distance determination to M31 of (m-M)0=24.30±0.11mag. This result, when combined with the previous distance determination to M31, results in a distance modulus of (m-M)0=24.36±0.08mag (744±33kpc), fully compatible with other distance determinations to M31. With an error of only project. Description: Log of spectroscopic observations and heliocentric radial velocity determinations (when available) used to determine the fundamental properties of M31V_J00443610+4129194. Objects: --------------------------------------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------------------------------------- 00 44 36.10 +41 29 19.4 M31V_J00443610+4129194 = D31 J004436.1+412919.6 --------------------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 49 9 Radial velocities of M31V_J00443610+4129194
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 F11.3 --- HJD Heliocentric Julian date 13- 16 I4 s ExpTime Exposure time 18- 19 I2 --- S/N Signal-to-noise ratio 21- 25 F5.3 --- Phase Orbital phase 27- 32 F6.1 km/s RVp ? Radial velocity for primary 34- 37 F4.1 km/s e_RVp ? Radial velocity error for primary 39- 44 F6.1 km/s RVs ? Radial velocity for secondary 46- 49 F4.1 km/s e_RVs ? Radial velocity error for secondary
Acknowledgements: Francesc Vilardell, francesc.vilardell(at)
(End) F. Vilardell, [Univ. Barcelona, Spain], P. Vannier [CDS] 28-Jan-2010
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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