Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199..925l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 199, June 1982, p. 925-941.
Astronomy and Astrophysics
Astronomy
41
Binary Stars, Cepheid Variables, Radial Velocity, Astronomical Photometry, Companion Stars, Infrared Photometry, Orbital Elements, Stellar Mass, Tables (Data), Ultraviolet Spectroscopy
Scientific paper
A homogeneous set of 769 radial velocity observations of 50 classical Cepheids in the period 1966-70 is used to detect possible binaries by comparison with earlier velocity curves. Seven stars are considered probable binaries: U Aql, AX Cir, R Mus, BF Oph, R TrA, V350 Sgr and AH Vel. The binary frequency is found to be 18%. Orbits were determined for the known binaries S Mus and V636 Sco and the period of FF Aql was confirmed. S Mus has the shortest orbital period so far reported for a Cepheid, 506 days. This is in reasonable agreement with the minimum orbital period of 200 days permitting such a star to survive the preceding evolutionary stage of maximum radius at the time of helium ignition in the core. Published photometric data and some new infrared photometry permit detection of some of the companions. Ultraviolet spectroscopy of a blue companion from a satellite appears to offer the best method of determining the dynamical mass of a Cepheid
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