The nature of the Be binary HR 2142

Details The nature of the Be binary HR 2142 The nature of the Be binary HR 2142

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250..437w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 2, Oct. 1991, p. 437-444.

Astronomy and Astrophysics

Astrophysics

12

B Stars, Binary Stars, Stellar Envelopes, Stellar Evolution, Stellar Luminosity, Companion Stars, Cool Stars, Roche Limit, Spectral Energy Distribution

Scientific paper

The energy distribution of the interactive binary HR 2142 (B2 IVne + ?) is studied in order to derive constraints on the luminosity of the companion and to test the model in which the companion is a cool, Roche lobe filling giant. For any reasonable choice of T(eff), the companion should have been detected in the red part of the spectrum if it were filling its Roche lobe, corresponding to a radius of 31 R solar radii. An alternative model is proposed where the companion is a Helium star, and the disk around the Be star is not an accretion disk but a mass loss disk. Alternatively the companion may already have evolved into a white dwarf.

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