Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-05-31
Astronomy and Astrophysics
Astrophysics
4 pages, 1 figure, to appear in Revista Mexicana de Astronomia y Astrofisica Serie de Conferencias: ``The Seventh Texas-Mexico
Scientific paper
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.
Fulbright Jon P.
Ivans Inese I.
Kraft Ralph Porter
Langer Edward G.
Smith Verne V.
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