Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.291..749h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 291, p. 749
Astronomy and Astrophysics
Astronomy
20
Eclipsing Binary Stars, Stellar Spectra, Stellar Mass Ejection, Astronomical Spectroscopy, Astronomical Maps, Accretion Disks
Scientific paper
We present the first spectroscopic investigation of the short-period (P = 0.309614 d) mass-exchanging binary system V361 Lyr. The spectral type of the primary component is estimated to be F8-G0. The H-alpha line profile clearly shows two absorption components when the system is at its brightest and bluest stage, around orbital phases 0.35-0.45. The published V and I light curves are analyzed with LIGHT2 to show that the primary component (T= 6200 K) fills its Roche lobe, while the secondary (T = 4500 K) is detached and fills about 57 percent of the available Roche volume. Eclipse maps of both stellar surfaces are derived via DOTS from light curves obtained in 1988, 1989, and 1992. These show that the secondary has a persistent elongated hot structure on its equator with an estimated temperature of 10,000 K which is consistent with the expectations of a theoretical mass transfer stream leaving the primary at its inner Lagrangian point and falling onto the secondary.
Bell Aaron S.
Collier Cameron Andrew
Harries Tim J.
Hilditch Ron W.
Hill Gary
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