Getting the Red Out: A Stellar Approach to Determining Spatial Variations of Interstellar Dust

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By employing two different spectroscopic techniques we have mapped out the variable ISM dust extinction endemic to globular cluster M4. We derive an average E(B-V) reddening of 0.33 +/- 0.01 and R = 3.4 +/- 0.4, both in good agreement with previous studies of M4. For individual stars in the most heavily reddened regions of M4, we find E(B-V) values significantly higher than those inferred by studies of interstellar gas; for heavily reddened regions, the gas measured in column density measurements may not completely trace the dust.
4 pages, 1 figure, to appear in Revista Mexicana de Astronomia y Astrofisica Serie de Conferencias: ``The Seventh Texas-Mexico Conference on Astrophysics: Glows, Flows & Blows'' April 6-8, 2000, Austin, Texas

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Astrophysics

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http://salesiana.dossiersoluciones.com/handle/123456789/1104

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/astro-ph/0005595
 http://arxiv.org/abs/astro-ph/0005595

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arXiv