Other
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.275..100c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 275, Issue 1, pp. 100-114.
Other
21
Binaries: Close, Stars: Individual: Ec11575-1845, Novae, Cataclysmic Variables, Stars: Variables: Other
Scientific paper
EC11575-1845 is a non-eclipsing binary consisting of an sdO primary and a late M-type secondary showing a large reflection effect. UBVRI photometry reveals an orbital period of 7.86h, with the amplitude of the reflection effect increasing with wavelength as expected. The spectroscopic behaviour reveals absorption lines from the primary and variable intensity emission-line features from the heated face of the secondary. The radial velocity variations of both components restrict the mass ratio to M_2/M_1=0.29-0.32. A self-consistent model can be derived for the system using Napier's algorithm, which constrains the masses and radii of the components, the orbital inclination and the effective temperature of the primary. From evolutionary considerations it is shown that EC11575-1845 belongs to a small class of progenitors of cataclysmic variable stars which on a time-scale of 10^8-10^10 yr may develop cataclysmic activity.
Chen Aiqing
Kilkenny Dave
O'Donoghue Darragh
Roberts Gareth
Stobie Robert S.
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