The detection of a companion star to the Cepheid variable Eta Aquilae

Details The detection of a companion star to the Cepheid variable Eta Aquilae The detection of a companion star to the Cepheid variable Eta Aquilae

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238l..87m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 238, June 1, 1980, p. L87-L90. NASA-supported research.

Astronomy and Astrophysics

Astronomy

17

Cepheid Variables, Companion Stars, Stellar Spectra, Ultraviolet Spectra, Iue, Stellar Luminosity, Stellar Temperature, Ultraviolet Astronomy

Scientific paper

Ultraviolet spectra have been obtained with IUE of the classical Cepheid Eta Aquilae at several phases in the 7.18 day period. Significant ultraviolet emission is detected at wavelengths less than 1600 A, where little flux is expected from classical Cepheids. Furthermore, the emission at wavelengths less than about 1600 A does not vary with phase. Comparison with model atmosphere flux distributions shows that the nonvariable emission is consistent with the flux expected from a main-sequence companion star with an effective temperature of about 9500 K (A0 V). The observed ultraviolet flux and spectral type are used to compute a distance of 300 pc to the system, in agreement with the distance predicted using the period luminosity relation.

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