Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..111k&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, Feb. 1992, p. 111-120.
Astronomy and Astrophysics
Astronomy
19
Abundance, Metallicity, Sky Surveys (Astronomy), Variable Stars, Solar Neighborhood, Spectral Resolution, Stellar Magnitude, Stellar Spectrophotometry
Scientific paper
Preston Delta S metallicities are derived for 35 type ab field RR Lyrae stars from low-resolution resolution (9 A) scans with the Intensified Reticon Scanner (IRS) on the Kitt Peak No. 2 0.9-m telescope. No abundances were previously known for 14 of these stars. The rms error in the Delta S derived from one of these IRS scans (of good quality) was +/- 1.6. The anomalous colors and spectra of the type ab RR Lyr BB Virginis can be understood if it is a binary whose nonvariable component is a blue horizontal branch star; in this case the Delta S of the RR Lyr component is about 9. It is speculated that the unusual color of AR Herculis may have a similar explanation; techniques for finding further members of this class are considered. The advisability of using the Ca II K line alone for determining metallicities is briefly discussed.
Carretta Eugenio
Kinman Thomas D.
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