The ratio of total to selective absorption in the Carina OB2 association |
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| Authors: | B García J J Clariá H Levato |
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| Institution: | (1) Facultad de Ciencias Astronómicas y Geofisicas, Universidad Nacional de La Plata, Argentina;(2) Observatorio Astronómico, Universidad Nacional de Córdoba, Argentina;(3) Complejo Astronómico El Leoncito, San Juan, Argentina;(4) Present address: Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina, Argentina;(5) Present address: Carrera del Investigator Científico del Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina, Argentina |
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| Abstract: | Several previous studies in and around the Great Carina nebula (NGC 3372) have strongly indicated an abnormal interstellar extinction law with a high ratio of total to selective absorptionR. In the present study, newUBV photometric data and accurate MK spectral-types of stars in the region of the Carina OB2 association are used to show that (1) Car OB2 is a genuine stellar association located at a distance of 3.2 kpc, and (2) the interstellar extinction law seems to be normal throughout most of the region. A representative value ofR = A
v/E(B – V) = 3.0 is derived for Car OB2 from the variable extinction method.Visiting Astronomer, Cerro Tololo Inter-American Observatory, operated by AURA, Inc. under contract with the National Science Foundation. |
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