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The total‐to‐selective extinction ratio determined from near IR photometry of OB stars
Author(s) -
Wegner W.
Publication year - 2003
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.200310081
Subject(s) - stars , extinction (optical mineralogy) , photometry (optics) , extrapolation , physics , astrophysics , photometric system , infrared , astronomy , mathematics , statistics , optics
The paper presents an extensive list of the total to selective extinction ratios R calculated from the infrared magnitudes of 597 O and B stars using the extrapolation method. The IR magnitudes of these stars were taken from the literature. The IR colour excesses are determined with the aid of “artificial standards” – Wegner (1994). The individual and mean values of total to selective extinction ratios R differ in most cases from the average value R = 3.10 ±0.05 – Wegner (1993) in different OB associations. The relation between total to selective extinction ratios R determined in this paper and those calculated using the “method of variable extinction” and the Cardelli et al. (1989) formulae is discussed. The R values presented in this paper can be used to determine individual absolute magnitudes of reddened OB stars with known trigonometric parallaxes.