The Absolute Magnitudes of Rr-Lyrae Stars - Part Four - V445-OPHIUCHI Ss-Leonis and Vy-Serpentis

Details The Absolute Magnitudes of Rr-Lyrae Stars - Part Four - V445-OPHIUCHI Ss-Leonis and Vy-Serpentis The Absolute Magnitudes of Rr-Lyrae Stars - Part Four - V445-OPHIUCHI Ss-Leonis and Vy-Serpentis

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.247..287f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 247, NO.2/NOV15, P. 287, 1990

Astronomy and Astrophysics

Astronomy

33

Scientific paper

We present optical and infrared light curves for the RR Lyrae stars V445 Oph, SS Leo and VY Ser. We also present radial-velocity curves for V445 Oph and SS Leo. Using these, plus previously published observations, we derive absolute magnitudes for the three stars using a variation of the Baade-Wesselink method. We find =0.29 and 0.63 for the metal-poor stars SS Leo and VY Ser and = 1.18 for the metal-rich RR Lyrae V445 Oph. Our results for VY Ser are compared with previous Baade-Wesselink work on this star and the discrepancies analysed. Finally we discuss the main sources of error in our method, in particular the errors associated with the radial-velocity curve.

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