Dust within globular clusters

Details Dust within globular clusters Dust within globular clusters

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95..500f&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 95, Feb. 1988, p. 500-509. Research supported by the Universidad Nacional de La Plat

Astronomy and Astrophysics

Astronomy

12

Brightness Distribution, Cosmic Dust, Globular Clusters, Interstellar Extinction, Stellar Spectrophotometry, Astronomical Models, Charge Coupled Devices, Signal To Noise Ratios, Ubv Spectra

Scientific paper

This paper presents a four-color (BVRIKC) CCD survey of ten southern globular clusters. Surface-brightness analysis shows the existence of regions with light deficiency, which are likely to be identified as obscured areas. The behavior of the apparent extinction can be explained, assuming that relatively dark clouds (intrinsic AV = 2.5 mag, on the average) are located within the clusters. Color sampling on 21 cloud candidates reveals that, in 18 cases, the apparent extinction as a function of wavelength is consistent with a combination of geometrical (position) and scattering effects. Dust masses are on the order of 5×10-3M_sun; per cloud, but the minimum total dust content in each cluster may be one order of magnitude larger.

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