A new slowly pulsating subdwarf-B star: HD 4539

Details A new slowly pulsating subdwarf-B star: HD 4539 A new slowly pulsating subdwarf-B star: HD 4539

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007coast.151...67s&link_type=abstract

Communications in Asteroseismology, Vol.151, p. 67-76

Physics

3

Scientific paper

We report the spectroscopic discovery of slow pulsations in the subdwarf-B (sdB) star HD 4539. It is amongst the brightest sdB stars and, as such, has been well studied. Its temperature and gravity would place it squarely where the so-called "Betsy" stars (long-period sdB pulsators) are found, and this has been confirmed by the discovery of line-profile variations reported in this paper for the first time. As periodogram analyses of radial velocity curves obtained in 2005 and 2006 yield several significant frequencies, line-profile variations are very probably a consequence of pulsation.

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