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Title:
A potential φ Per-type (Be+sdO) binary: FY CMa
Authors:
Rivinius, Th.; Štefl, S.; Maintz, M.; Stahl, O.; Baade, D.
Affiliation:
AA(Landessternwarte Königstuhl, 69117 Heidelberg, Germany ), AB(Astronomical Institute, Academy of Sciences, 251 65 Ondřejov, Czech Republic), AC(Landessternwarte Königstuhl, 69117 Heidelberg, Germany), AD(Landessternwarte Königstuhl, 69117 Heidelberg, Germany), AE(European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany)
Publication:
Astronomy and Astrophysics, v.427, p.307-311 (2004) (A&A Homepage)
Publication Date:
11/2004
Origin:
A&A
A&A Keywords:
stars: emission-line, Be, stars: binaries: spectroscopic, stars: individual: FY CMa
DOI:
10.1051/0004-6361:20041161
Bibliographic Code:
2004A&A...427..307R

Abstract

The spectrum of the Be star FY CMa is shown to vary periodically with P=37.26±0.03 d. The types of variation, exhibiting transient strong shell phases and a radial-velocity variable He I emission component, suggest the star to be of the same type as φ Per, i.e. having an evolved hot companion ionizing the outer parts of the primary's circumstellar disc where it faces the hot companion. After φ Per and the candidates 59 Cyg and HR 2142, this is only the fourth promising candidate, although such systems should be relatively abundant. The similarities found between φ Per, 59 Cyg, and FY CMa include a radial velocity-variable He I emission feature and a phase-locked V/R cycle. An ephemeris is given that allows a test of the proposed recurrent nature of a strong shell feature observed only in a single spectrum at present.

Based on observations collected at the South African Astronomical Observatory.

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