Blue companions of Cepheids

Details Blue companions of Cepheids Blue companions of Cepheids

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...296..175b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 296, Sept. 1, 1985, p. 175-184.

Astronomy and Astrophysics

Astrophysics

44

Binary Stars, Blue Stars, Cepheid Variables, Stellar Luminosity, Stellar Temperature, Helium, Stellar Evolution, Stellar Mass, Stellar Oscillations, Ultraviolet Spectra

Scientific paper

Twenty-one Cepheids, known or suspected to have blue companions, were studied with the International Ultraviolet Explorer satellite. For 13 of them, companions were indeed seen, though they were generally fainter in the UV than expected. For four Population I Cepheids, the suspected companions were not seen. For none of the Population II Cepheids could a companion be detected. The effective temperatures and luminosities of the companions which could be observed are discussed, and the positions of Cepheids and companions in the T(eff) luminosity diagrams are compared with positions expected from stellar evolution calculations.

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