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Long-term photometry of the near-contact detached binary GR Tauri
We present photometric observations of the eclipsing binary GR Tau madein 1985, 1993, 1998, 2000 and 2001. New times of minima and ephemeridesare given. Based on a statistical analysis of the times of minimaobtained by photoelectric and CCD photometry, the orbital period of thesystem is found to be decreasing with a rate of Delta P/P = 3.27*E-10 during the past decades. An assumed hot spot on thetrailing hemisphere of the secondary enables us to reconstruct thepeculiar asymmetry of the distorted light curves. The photometricsolution with the Wilson-Devinney code reveals that GR Tau is anear-contact detached system with the two components almost fillingtheir respective critical Roche lobes. The photometric mass ratio turnsout to be q=0.22, and the masses and radii are derived for thecomponents as M1=1.42+/- 0.18 Msun,M2=0.31+/- 0.04 Msun, R1=1.47+/- 0.19Rsun and R2=0.70+/- 0.09 Rsun. Theauthors discuss the possible evolutionary status of the component starsand the probable nature of the assumed hot spot. Tables A.1 to A.3 areonly available in electronic at the CDS via anonymous ftp tocdsarc.u-strasbg.fr (130.79.125.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/395/587
| A Study of the Binary GR Tauri from Optical and Infrared Observations
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1995AJ....110.1796L&db_key=AST
| Photoelectric Observations of GR Tauri
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| Short-period noncontact close binary systems. II - GR Tauri
The results of photoelectric and spectrographic surveys and a lightcurve analysis of the closed binary system GR Tau are reported. Thecomponent masses are calculated to be 0.54 and 0.17 solar mass withradii of 1.03 and 0.49 solar radii, respectively. The primary componentis an A5 V spectral type and the secondary an M dwarf. The primary hasan absolute visual magnitude of 3.2 and the secondary, 7.3. Theeffective temperature of the primary is assumed to be about 8500 K. Thelack of observed changes in the last 50 yr leads to the conclusion thatmass transfer has not yet begun, unless GR Tau is in a temporaryout-of-contact phase. The light curve, however, indicates that theprimary component has nearly filled its Roche lobe.
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