HR 4511 - A probable Cepheid with a supergiant-like hot companion

Details HR 4511 - A probable Cepheid with a supergiant-like hot companion HR 4511 - A probable Cepheid with a supergiant-like hot companion

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..201p&link_type=abstract

Astrophysical Journal, Part 1, vol. 245, Apr. 1, 1981, p. 201-207. Research supported by the University of Texas;

Astronomy and Astrophysics

Astrophysics

11

B Stars, Binary Stars, Cepheid Variables, Companion Stars, Stellar Spectra, Supergiant Stars, H Lines, Iue, Resonance Lines, Spectral Energy Distribution, Stellar Winds, Ultraviolet Spectra

Scientific paper

IUE observations have shown HR 4511 to have an early B-type companion with a strong stellar wind. Fitting the energy distribution of the system from far-UV to middle-IR yields a difference of about 3.2 mag at the V passband. Since HR 4511 is in the small cluster Stock 14 and has M(V) = -7.8, M(V) for the secondary is about -4.6, which is only slightly more luminous than the known BO.5 III and B1 stars at the turnoff point. This implies an inconsistency between the deduced luminosity of the secondary and the nature of its UV spectrum, which mimics stars of considerably greater luminosity. It is suggested that the secondary may have been observed in a brief stage between core and shell H burning.

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