K2 observations of the pulsating subdwarf B star EQ Piscium: an sdB+dM binary

C. S. Jeffery; Gavin Ramsay

doi:10.1093/mnrasl/slu059

K2 observations of the pulsating subdwarf B star EQ Piscium: an sdB+dM binary

Solar and Stellar Astrophysics 2015-06-19 v1

Authors: C. S. Jeffery , Gavin Ramsay

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

K2, the two-wheel mission of the Kepler space telescope, observed the pulsating subdwarf B star EQ Psc during engineering tests in 2014 February. In addition to a rich spectrum of g-mode pulsation frequencies, the observations demonstrate a light variation with a period of 19.2 h and a full amplitude of 2%. We suggest that this is due to reflection from a cool companion, making EQ\,Psc the longest-period member of some 30 binaries comprising a hot subdwarf and a cool dwarf companion (sdB+dM), and hence useful for exploring the common-envelope ejection mechanism in low-mass binaries.

Keywords

subdwarf B star pulsation binary star K2 mission reflection effect common-envelope ejection

Cite

@article{arxiv.1404.7470,
  title  = {K2 observations of the pulsating subdwarf B star EQ Piscium: an sdB+dM binary},
  author = {C. S. Jeffery and Gavin Ramsay},
  journal= {arXiv preprint arXiv:1404.7470},
  year   = {2015}
}

Comments

Accepted for publication in MNRAS

Related papers

View all related →