Astronomy and Astrophysics – Astronomy
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mnras.350...95p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 350, Issue 1, pp. 95-112.
Astronomy and Astrophysics
Astronomy
15
Binaries: Spectroscopic, Cepheids
Scientific paper
High-resolution spectroscopic observations have been made of a number of southern Cepheids. The stars studied were part of a long-term programme to observe southern variable stars and to complete a data base of radial velocities over a long time interval. The radial velocities have a precision of ~300 m s-1, allowing the detection of velocity differences of ~1 km s-1 with confidence. Our new data provide a consistent set of data against which other sources of data can be compared.
Masses were determined for two systems, the 9-d Cepheid S Mus (6.2 +/- 0.2 Msolar) and the 5-d Cepheid V350 Sgr (6.0 +/- 0.9 Msolar). For another seven Cepheids (Y Car, YZ Car, AX Cir, BP Cir, V636 Sco, W Sgr and T Mon), new or improved orbital solutions were found.
New results presented here include the first orbital solution for AX Cir, a completely revised orbital solution for YZ Car, which established its eccentricity and orbital motion, and a new pulsation period (2.398 19 d) for BP Cir. The pulsational mass determinations provide further confirmation of the convergence of mass determinations between dynamical and evolutionary methods.
Albrow Michael D.
Cottrell Peter L.
Petterson Orlon K. L.
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