Other
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.1638e&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, no. 5, May 1992, p. 1638-1646. Research supported by NSERC.
Other
11
Binary Stars, Cepheid Variables, Stellar Evolution, Stellar Spectra, Interstellar Extinction, Iue, Stellar Luminosity, Stellar Magnitude, Stellar Spectrophotometry
Scientific paper
IUE spectra of the system containing the Cepheid BP Cir are used to derive the magnitude difference between the two stars (Δ V = 1.88 ± 0.3 mag) and the spectral type of the companion (B6.OV). This is the first system yet encountered for which the standard Seaton reddening law is inappropriate. For BP Cir, a stronger 2200 Å bump than the standard law is required. However, this does not affect the determination of the temperature of the hot star or the magnitude difference between the two stars, because those use the wavelength regions shorter than 1600 Å and longer than 2500 Å. The stars are very similar in mass. Possible pulsation in the first overtone mode implies that BP Cir B is evolved beyond the ZAMS but is still in the main sequence band. The best match to BP Cir A and B is with isochrones by Stothers and Chin (1991) with Inglesias and Rogers (1991) opacities and no core convective overshoot and Cepheid pulsation in the first overtone.
Arellano Ferro Armando
Remage Evans Nancy
Udalska Joanna
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