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Suggested UV spectral classification criteria for A starsCriteria for determining effective temperature and electron density independently of abundances, for A, late B, and F stars are given. Comparison of IUE data with standard classification techniques, shows that for late B and A stars, temperature classification by UV spectra is more sensitive than classification using visual spectra. The long wavelength wing of the Lyman is recommended for these stars. For A and F stars, the ratio of the Mg (2580 A) and Mg+ (2800A) resonance lines gives a good temperature/electron density (ne) criterion which is nearly independent of metal abundance (Z). The SiI discontinuities give an excellent temperature classification for A and F stars, but it is dependent on Z and ne. If the absolute intensities of either of the Mg lines are added to the criteria, three classification criteria for a three dimensional classification, according to temperature, ne and Z, are obtained.
Document ID
19820018254
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Boehm-Vitense, E.
(Washington Univ. Seattle, WA, United States)
Date Acquired
August 10, 2013
Publication Date
March 1, 1982
Publication Information
Publication: ESA Ultraviolet Stellar Classification
Subject Category
Astronomy
Accession Number
82N26130
Funding Number(s)
CONTRACT_GRANT: NSG-5398
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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