The luminosities of the binary cepheids SU Cyg, SU CAS and W SGR

Details The luminosities of the binary cepheids SU Cyg, SU CAS and W SGR The luminosities of the binary cepheids SU Cyg, SU CAS and W SGR

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263..403r&link_type=abstract

In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 403-40

Astronomy and Astrophysics

Astrophysics

1

Cepheid Variables, Stellar Luminosity, Stellar Magnitude, Stellar Spectra, Blue Stars, Companion Stars, Iue

Scientific paper

Absolute magnitudes for binary classical Cepheids were derived by ratioing IUE low dispersion spectra in regions where the blue companion dominates with spectra of main sequence spectral type standards. The IUE spectra are also used to determine the magnitude difference between the Cepheid and the blue companion. Absolute magnitudes determined for SU Cyg and W Sgr agree with the absolute magnitudes of Sandage and Tammann and Caldwell within the + or - 0m2 estimated uncertainty, but not with the fainter absolute magnitudes of Schmidt. The absolute magnitude of SU Cas is in better agreement with the PLC relations if it is pulsating in the first overtone mode.

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