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Publikováno v:
Memoirs of the American Academy in Rome, 2020 Jan 01. 65, 172-193.
Externí odkaz:
https://www.jstor.org/stable/27031298
Akademický článek
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Publikováno v:
Astron.Astrophys. 405 (2003) 249-262
We present high resolution optical and UV spectra of the 46 min orbital period, helium binary, GP Com. Our data contains simultaneous photometric correction which confirms the flaring behaviour observed in previous optical and UV data. In this system
Externí odkaz:
http://arxiv.org/abs/astro-ph/0304265
Subdwarf B (sdB) stars are thought to be helium burning stars with low mass hydrogen envelopes. Several evolutionary paths have been proposed to explain the formation of these systems. One of these scenarios is the evolution of the sdB progenitor wit
Externí odkaz:
http://arxiv.org/abs/astro-ph/0209552
Publikováno v:
Mon.Not.Roy.Astron.Soc. 338 (2003) 752
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 through interaction with a binary companion and continue to reside in bin
Externí odkaz:
http://arxiv.org/abs/astro-ph/0209472
Publikováno v:
Mon.Not.Roy.Astron.Soc. 333 (2002) 231
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 orbital period, P=0.073d, and the mass function, f_m = 0.0010 +/- 0.0
Externí odkaz:
http://arxiv.org/abs/astro-ph/0202177
Publikováno v:
Mon.Not.Roy.Astron.Soc. 337 (2002) 1215
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 affected by strong selection effects. A test has been discovered which is
Externí odkaz:
http://arxiv.org/abs/astro-ph/0201538
Publikováno v:
Mon.Not.Roy.Astron.Soc.326:1391,2001
(Abbreviated) We have used precise radial velocity measurements of subdwarf-B stars from the Palomar-Green catalogue to look for binary extreme horizontal branch (EHB) stars. We identify 36 EHB stars in our sample and find that at least 21 of these s
Externí odkaz:
http://arxiv.org/abs/astro-ph/0103342
We present high resolution spectra of the AM CVn helium binary GP Com at two different wavelength ranges. The spectra show the same flaring behaviour observed in previous UV and optical data. We find that the central spike contributes to the flare sp
Externí odkaz:
http://arxiv.org/abs/astro-ph/0008450
Publikováno v:
Mon.Not.Roy.Astron.Soc. 317 (2000) L41
We present spectra of the pulsating sdB star KPD1930+2752 which confirm that this star is a binary. The radial velocities measured from the H-alpha and HeI6678 spectral lines vary sinusoidally with the same period (2h 17m) as the ellipsoidal variabil
Externí odkaz:
http://arxiv.org/abs/astro-ph/0007257