Dynamical Masses for Population I and Population II Cepheids

Details Dynamical Masses for Population I and Population II Cepheids Dynamical Masses for Population I and Population II Cepheids

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1764b&link_type=abstract

IUE Proposal ID #CBGEB

Computer Science

Scientific paper

We would like to obtain additional LWR 1) high resolution spectra of Pop I Cepheid binaries in order to determine the orbital velocities of the companions. (Actually, the velocity difference between Cepheid and companion). The velocities of the Cepheids are known from ground-based observation. The ratio of the velocities and thereby the mass ratio of the stars can then be determined. The spectral type of the companion is determined from the measured SWP spectrum energy distribution and yields the mass of the companion. The mass of the Cepheid can thereby be found. We can thereby check pulsational and evolutionary masses. We would like to extend our observations to the peculiar Pop II binary Cepheid AU Peg, whose orbital elements have recently been determined.

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