Spectral classification criteria for some early type stars in the UV region/atl> |
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| Authors: | MA Hamdy MS Abo Elazm SM Saad HO Nafie HE Abdel Baeth |
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| Institution: | (1) Department of Astronomy, National Research Institute of Astronomy and Geophysics, Cairo, Egypt;(2) Department of Physics, Faculty of Science, Zagazig University, Benha Branch, Egypt |
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| 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 λ λ 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.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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