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

C. Sneden; G. E. Langer; I. I. Ivans; J. P. Fulbright; N. B. Suntzeff; R. P. Kraft; V. V. Smith

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

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arxiv astro-ph/0005595 v1 pith:DQNDLF4N submitted 2000-05-31 astro-ph

I. I. Ivans , C. Sneden , R. P. Kraft , N. B. Suntzeff , V. V. Smith , G. E. Langer , J. P. Fulbright This is my paper · ORCID

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keywords dustheavilyinterstellarreddenedregionsstudiesagreementapproach

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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.

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