New spectroscopic binaries among classical Cepheids

Research output: Contribution to journalArticle

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Abstract

An extensive study of radial velocity data of more than 250 Cepheid variables taken from the literature has resulted in revealing spectroscopic-binary nature of 22 classical Cepheids: SS CMa, VZ CMa, VY Car, EY Car, FR Car, SY Cas, CG Cas, VW Cen, OO Cen, SU Cru, VX Cru, TZ Mon, XX Mon, RT Mus, CR Ori, LS Pup, YZ Sgr, AV Sgr, RU Sct, DP Vel, U Vul and SV Vul. The amplitude of the orbital effect superimposed on the pulsational radial velocity variation exceeds 10 km s-1 in eight cases and there are obvious changes in the γ-velocity for the other Cepheids, as well. Additional photometric evidence of duplicity is available for 8 variables in this sample. Each star discussed in this paper is recommended for thorough study in order to determine the orbital elements and physical parameters of companion star(s). The large number of newly found spectroscopic binaries confirms the recent result (Szabados, 1995) that incidence of binaries among classical Cepheids is higher than usually believed.

Original languageEnglish
Pages (from-to)189-196
Number of pages8
JournalAstronomy and Astrophysics
Volume311
Issue number1
Publication statusPublished - Jul 1 1996

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radial velocity
automobile
cepheid variables
companion stars
orbital elements
incidence
stars
orbitals
effect
parameter

Keywords

  • Binaries: spectroscopic
  • Cepheids

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

New spectroscopic binaries among classical Cepheids. / Szabados, L.

In: Astronomy and Astrophysics, Vol. 311, No. 1, 01.07.1996, p. 189-196.

Research output: Contribution to journalArticle

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