Classical Cepheid Masses: U Aquilae

Details Classical Cepheid Masses: U Aquilae Classical Cepheid Masses: U Aquilae

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...494..768e&link_type=abstract

Astrophysical Journal v.494, p.768

Astronomy and Astrophysics

Astronomy

20

Stars: Binaries: Spectroscopic, Stars: Individual Constellation Name: U Aquilae, Stars: Variables: Cepheids, Stars: Fundamental Parameters

Scientific paper

We have obtained medium-resolution spectra ( lambda / Delta lambda ~ 20,000) of the hot binary companion to the classical Cepheid U Aql with the Goddard High Resolution Spectrograph on the Hubble Space Telescope (HST). These have been used to determine the orbital velocity amplitude. Combining this with the orbital velocity amplitude of the Cepheid from the ground-based orbit and the mass of the companion inferred from its spectral type, we measure a mass of the Cepheid of 5.1 +/- 0.7 M&sun;. We discuss the full sample of Cepheids for which we have determined masses with HST (S Mus, V350 Sgr, Y Car, and U Aql) and also SU Cyg (mass from IUE). The HST masses are in agreement with the luminosities predicted by recent evolutionary tracks with moderate overshoot. This comparison, however, may be altered by reassessment of Cepheid distances based on Hipparcos parallaxes.

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