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Orbital periods of twenty two subdwarf B stars
L. Morales-Rueda, P. F. L. Maxted, T. R. Marsh +2
Subdwarf B (sdB) stars are thought to be core helium burning stars with low mass hydrogen envelopes. In recent years it has become clear that many sdB stars lose their hydrogen thr…
Photometry of four binary subdwarf B stars and the nature of their unseen companion stars
P. F. L. Maxted, T. R. Marsh, U. Heber +3
We present lightcurves of four binary subdwarf B stars, Ton 245, Feige 11, PG1432+159 and PG1017-086. We also present new spectroscopic data for PG1017-086 from which we derive its…
The systemic velocities of four long-period cataclysmic variable stars
R. C. North, T. R. Marsh, U. Kolb +2
Although a large number of orbital periods of cataclysmic variable stars (CVs) have been measured, comparison of period and luminosity distributions with evolutionary theory is aff…