Journal
ASTRONOMISCHE NACHRICHTEN
Volume 324, Issue 3, Pages 219-237Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asna.200310081
Keywords
infrared radiation; stars : fundamental parameters (total-to-selective extinction ratios); stars : early-type
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The paper presents an extensive list of the total to selective extinction ratios R calculated from the infrared magnitudes of 597 0 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.
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