C.D.S. - SIMBAD4 rel 1.7 - 2020.08.04CEST22:47:08

2005A&A...429..645S - Astronomy and Astrophysics, volume 429, 645-655 (2005/1-2)

Eclipsing binaries as standard candles. HD 23642 and the distance to the Pleiades.


Abstract (from CDS):

We present a reanalysis of the light curves of HD 23642, a detached eclipsing binary star in the Pleiades open cluster, with emphasis on a detailed error analysis. We compare the masses and radii of the two stars to predictions of stellar evolutionary models and find that the metal and helium abundances of the Pleiades are approximately solar. We present a new method for finding distances to eclipsing binaries, of spectral types A to M, using the empirical calibrations of effective temperature versus surface brightness given by Kervella et al. (2004A&A...426..297K). We use the calibration for K-filter surface brightness to determine a distance of 139.1±3.5pc to HD 23642 and the Pleiades. This distance is in excellent agreement with distances found from the use of theoretical and empirical bolometric corrections. We show that the determination of distance, both from the use of surface brightness relations and from the use of bolometric corrections, is more accurate and precise at infrared wavelengths than at optical wavelengths. The distance to HD 23642 is consistent with that derived from photometric methods and Hubble Space Telescope parallaxes, but is inconsistent with the distance measured using Hipparcos parallaxes of HD 23642 and of other Pleiades stars.

Abstract Copyright:

Journal keyword(s): stars: distances - stars: fundamental parameters - stars: binaries: eclipsing - stars: chemically peculiar - Galaxy: open clusters and associations: general - stars: binaries: spectroscopic

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2989 0
2 V* V1229 Tau Al* 03 47 29.4535999265 +24 17 18.016988974   6.87 6.81   6.74 A0VpSi+Am 173 0
3 * 27 Tau SB* 03 49 09.7425852 +24 03 12.300277 3.18 3.54 3.63 3.62 3.68 B8III 363 0

    Equat.    Gal    SGal    Ecl

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