Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apjs...69..301g&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 69, Feb. 1989, p. 301-321. Research supported by NSERC.
Astronomy and Astrophysics
Astrophysics
128
F Stars, Stellar Composition, Stellar Rotation, Stellar Spectra, Astronomical Photometry, Hertzsprung-Russell Diagram, Metallicity, Stellar Evolution, Stellar Luminosity, Stellar Temperature
Scientific paper
The classification for early F-type stars in the MK spectral classification system presented by Gray and Garrison (1987) is refined. The effect of rotation on spectral classification and ubvy-beta photometry of early F-type stars is examined. It is found that the classical luminosity criterion, the 4417 A/4481 A ratio gives inconsistent results. It is shown that most of the stars in the Delta Delphini class of metallic-line stars are either normal or are indistinguishable from proto-Am stars. It is suggested that the designation Delta Delphini should be dropped. The classifications are compared with Stromgren photometry. The effects of rotation on the delta-c1 index in the early-F field dwarfs is demonstrated.
Garrison Robert F.
Gray Richard O.
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