Radial velocities and iron abundances of field RR Lyraes. I.

Details Radial velocities and iron abundances of field RR Lyraes. I. Radial velocities and iron abundances of field RR Lyraes. I.

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..125..313f&link_type=abstract

A & A Supplement series, Vol. 125, October II 1997, 313-319.

Astronomy and Astrophysics

Astronomy

22

Stars: Abundances, V 363 Cas, At And, Stars: Binaries Spectroscopic, Stars: Variable, Stars: Kinematics

Scientific paper

We present systemic velocities and iron abundances for 56 RR Lyraes, the majority of which have been observed by the HIPPARCOS satellite. Comparison between our systemic velocities and previous values identifies several binary candidates only one of which, TU UMa, was previously suspected of being a binary. However, spectra of the unusual RR Lyrae BB Vir show no evidence of line doubling and hence do not support the recent claims that this star may have a Blue Horizontal Branch companion. Comparison between our abundances and previous determinations shows reasonable agreement except with the recent work of \cite[Layden (1994)]{Lay94} where we find systematic differences. Several of the stars included on the HIPPARCOS observing list as RR Lyraes are shown to be mis-classified. Of particular interest are the stars V363 Cas and AT And which, by analogy with XZ Cet, may be anomalous Cepheids. The Appendix is available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

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