| Issue |
A&A
Volume 395, Number 2, November IV 2002
|
|
|---|---|---|
| Page(s) | 587 - 593 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20021317 | |
| Published online | 14 November 2002 | |
Long-term photometry of the near-contact detached binary GR Tauri *
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China
Corresponding author: X. Zhang, xzhang@bao.ac.cn
Received:
3
June
2002
Accepted:
9
September
2002
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 
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 
, and the masses and radii are derived
for the components as 
, 
,
and 
. The authors discuss the possible
evolutionary status of the component stars
and the probable nature of the assumed hot spot.
Key words: stars: binaries: eclipsing / stars: individual: GR Tau
© ESO, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.