Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...278..208k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 278, March 1, 1984, p. 208-214.
Astronomy and Astrophysics
Astrophysics
14
Astronomical Spectroscopy, Early Stars, High Dispersion Spectrographs, Horizontal Branch Stars, Main Sequence Stars, Stellar Atmospheres, Abundance, Chemical Composition, Interstellar Extinction, Line Spectra, Radial Velocity, Variable Stars
Scientific paper
High-dispersion spectra (12.5 A/mm) were taken of 11 early-type stars with the Cassegrain image-tube spectrograph on the CTIO 4 m telescope, in order to improve previous classifications based on low-dispersion and/or photometric studies. Atmospheric parameters were determined, as well as interstellar reddenings and radial velocities. Five of the stars were classified as field horizontal-branch stars, two as high-luminosity stars, three as main-sequence stars, and one as an RR Lyrae variable star. Abundances of 11 elements were derived for the five field horizontal-branch stars and for one moderate high-luminosity star. A wide range of variation in (Ca/Fe) was detected, and its implications are discussed briefly.
Davis Philip A. G.
Kodaira Keichi
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