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Spectral classification criteria for some early type stars in the UV region
Faculty
Science
Year:
2002
Type of Publication:
Article
Pages:
203-218
Authors:
Nafie, HO, Hamdy, MA, Elazm, MSA, Saad, SM, Baeth, HEA
DOI:
10.1023/A:1015194309270
Journal:
ASTROPHYSICS AND SPACE SCIENCE KLUWER ACADEMIC PUBL
Volume:
279
Research Area:
Astronomy \& Astrophysics
ISSN
ISI:000174968900002
Keywords :
Spectral classification criteria , some early type
Abstract:
The aim of this paper is to get new critertia for spectral classification of some early type stars which depend on the flux in the UV region lambdalambda 1500-2500 by carrying out spectrophotometric analysis of observational ultraviolet data of stars obtained by the S2/68 Ultraviolet Sky Survey Telescope (UVSST) aboard the European Space Research Organization (ESRO) Satellite TD1. We have developed these new criteria based on the Intrinsic Ultraviolet Colour Index (IUI), and the Intrinsic Flux Ratio (IFR). Using these quantities we are going to represent the results of spectral classification of 323 early type stars mainly from spectral type B and A. The results of calculations of the Intrinsic Flux Ratios for the stars under investigation together with their Colour Temperatures (Tc) are given. Comparison between our suggested two new criteria with the MK classification system and Cucchairo (1980) classification system was carried out.
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