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Title:
The late A-type stars - Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation
Authors:
Gray, R. O.; Garrison, R. F.
Affiliation:
AA(Toronto, University, Canada), AB(Toronto, University, Canada)
Publication:
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 70, July 1989, p. 623-636. Research supported by NSERC. (ApJS Homepage)
Publication Date:
07/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
A Stars, Astronomical Catalogs, Early Stars, Stellar Rotation, Stellar Spectrophotometry, Stellar Luminosity, Stellar Temperature, Ubv Spectra
DOI:
10.1086/191349
Bibliographic Code:
1989ApJS...70..623G

Abstract

The MK spectral classification for late A-type stars is refined and the effects of rotation of spectral classification and uvby(beta) photometry for these stars are examined. It is found that, for A3 stars, the 4417/4481 A wavelength ratio produces results that are inconsistent with the Stark broadening of the H lines. It is suggested that this ratio is not useful as a luminosity criterion at any spectral type. Self-consistent sequences of narrow- and broadline standards are established. The results of the refined classification system are compared with Stromgren photometry, showing a set of low-v sin i A-type stars with anomalously large delta(c1) indices for their luminosity types. It is proposed that these stars are rapid rotators seen at fairly low inclination angles.

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