BL Andromedae and GW Tauri: close binary stars in a key evolutionary stage

Details BL Andromedae and GW Tauri: close binary stars in a key evolutionary stage BL Andromedae and GW Tauri: close binary stars in a key evolutionary stage

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.367..423z&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 367, Issue 1, pp. 423-432.

Astronomy and Astrophysics

Astronomy

12

Binaries: Close-Binaries: Eclipsing-Stars: Evolution-Stars: Individual: Bl Andromedae-Stars: Individual: Gw Tauri

Scientific paper

A photoelectric light curve of BL And is presented along with the first CCD light curve of GW Tau. Both objects are short-period eclipsing binaries and were observed in 2003 or 2004. Photometric elements were computed using the latest version of the Wilson-Van Hamme code. The results reveal that BL And is a semidetached system with the primary component filling its Roche lobe and the secondary one almost filling but still detached, while GW Tau is a marginal-contact binary system with a small degree of contact (f= 10.9 per cent) and a large temperature difference of about 3100K. All available eclipse times, including new ones, were analysed for each system. It was found that the orbital period of BL And is decreasing at the rate of dP/dt=-2.36 × 10-8 (+/-0.09)dyr-1 while that of GW Tau may be decreasing or oscillating. We think period decrease is more probable. The derived configuration and secular period decrease for BL And combined with the asymmetry of the light curve indicate that this system may evolve from the present semidetached phase into a contact stage, with mass transfer from the primary component to the secondary one through the L1 point, or that it might just undergo the broken stage predicted by the theory of thermal relaxation oscillations. In contrast, GW Tau is a marginal-contact binary in poor thermal contact and may be at the beginning of the contact phase.

Affiliated with

Also associated with

No associations

Rating

BL Andromedae and GW Tauri: close binary stars in a key evolutionary stage does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with BL Andromedae and GW Tauri: close binary stars in a key evolutionary stage, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and BL Andromedae and GW Tauri: close binary stars in a key evolutionary stage will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-975841