Sign on

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (123) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (288)
· Also-Read Articles (Reads History)
·
· Translate This Page
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.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences



More Article Retrieval Options

HELP for Article Retrieval


Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

  New!

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints