2002A&A...395..587Z


Query : 2002A&A...395..587Z

2002A&A...395..587Z - Astronomy and Astrophysics, volume 395, 587-593 (2002/11-4)

Long-term photometry of the near-contact detached binary GR Tauri.

ZHANG X.B., ZHANG R.X. and FANG M.J.

Abstract (from CDS):

We present photometric observations of the eclipsing binary GR Tau made in 1985, 1993, 1998, 2000 and 2001. New times of minima and ephemerides are given. Based on a statistical analysis of the times of minima obtained by photoelectric and CCD photometry, the orbital period of the system is found to be decreasing with a rate of ΔP/P=3.27x10–10 during the past decades. An assumed hot spot on the trailing hemisphere of the secondary enables us to reconstruct the peculiar asymmetry of the distorted light curves. The photometric solution with the Wilson-Devinney code reveals that GR Tau is a near-contact detached system with the two components almost filling their respective critical Roche lobes. The photometric mass ratio turns out to be q=0.22, and the masses and radii are derived for the components as M1=1.42±0.18M, M2=0.31±0.04M, R1=1.47±0.19R and R2=0.70±0.09R. The authors discuss the possible evolutionary status of the component stars and the probable nature of the assumed hot spot.

Abstract Copyright:

Journal keyword(s): stars: binaries: eclipsing - stars: individual: GR Tau

VizieR on-line data: <Available at CDS (J/A+A/395/587): tablea1.dat tablea2.dat tablea3.dat tables.tex>

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 BD+19 642 * 04 00 39.9581916961 +20 18 11.876880081   9.86 9.34     F8 10 0
2 HD 25161 * 04 00 40.6536222641 +20 24 48.001830079   8.25 8.05     A0 12 0
3 V* GR Tau EB* 04 01 03.2346895884 +20 24 50.251325044   10.80 10.36 10.43   A5V 75 0
4 GSC 01258-00171 * 04 01 03.3157601487 +20 22 33.311885606   12.80       ~ 2 0
5 V* V1010 Oph EB* 16 49 27.6691070212 -15 40 04.682104216   6.40 6.19     A3V 144 0

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2021.10.21-15:04:56

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