Abstract
We present an observational analysis of the eclipsing double-lined spectroscopic binary HR 1300 = GW Eri. Fifteen spectra with resolution R=35000 were obtained with the 2.15-m telescope and the bench echelle spectrograph EBASIM of the CASLEO, while photometric observations in the V band were carried out with the 61-cm telescope at CASLEO. We measured radial velocities for both stellar components by cross-correlations using the IRAF task fxcor. We use as template an observed spectrum of a low rotation star (HR8641) taken from the ELODIE database, which has a similar spectral resolution. This template was previously convolved with an appropriate rotational profile.
>From our light and radial velocity curves we derived orbital and physical parameters for the system using the Wilson & Devinney code. Assuming a temperature of 9000 K for the primary component, as estimated from the spectral type, we obtained for the secondary companion a temperature of 8680 +/- 30 K. The resulting values for absolute masses and radii were 1.797 +/- 0.006 M_sun and 1.811 +/- 0.008 R_sun for the primary component, and 1.779 +/- 0.011 M_sun and 1.786 +/- 0.016 R_sun for the secondary. The comparison with theoretical stellar models of Girardi et al. (2000, A&AS 141, 371) for solar composition suggests an age of 10^{8.7} yr. However, despite the high precision of the calculated masses and radii, the great similarity of the two stellar components prevents us from using this system as a test for stellar models.