Computer Science
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.182..115b&link_type=abstract
In ESA Ultraviolet Stellar Classification p 115-120 (SEE N82-26119 16-89)
Computer Science
Classifications, Parameter Identification, Stellar Spectra, Ultraviolet Spectra, Blue Stars, Chemical Composition, Iue, Photosphere, Spectral Resolution, Stellar Atmospheres, Stellar Temperature, Subdwarf Stars
Scientific paper
Stellar atmosphere parameters and the importance of spectral resolution for stellar classification are discussed and analyses of blue halo stars are summarized. A UV classification scheme, involving effective temperature, surface gravity, an abundance parameter (given variations in He, CNO, or metal abundance) and peculiarity affixes similar to the MK system, is advocated. Spectral resolution of 1 A at 1500 A can be achieved, using high dispersion IUE spectra. Analysis of the OB subdwarf HD 149382 shows the importance of high dispersion spectra compared with the 6A low dispersion observations. Anomalies such as silicon underabundance by a factor 40,000, are clearly revealed. Lack of atomic data (line identification lists, oscillator strengths) limits line identification, so quantitative calibration, especially at low reduction, is difficult unless the classification features are dominated by a very few, very strong, lines.
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