Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..871m&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, March 1992, p. 871-890. Research supported by Vatican Research Group and CONICO
Astronomy and Astrophysics
Astronomy
24
Astronomical Polarimetry, Globular Clusters, Linear Polarization, Red Giant Stars, Stellar Envelopes, Infrared Astronomy Satellite, Interstellar Matter, Magellanic Clouds, Milky Way Galaxy, Star Formation
Scientific paper
Polarization measurements of more than 250 stars, most of them red giants, in the fields of seven metal-poor globular clusers are presented. Strong spatial variations of the polarization in the fields of NGC 4372, NGC 4833, M4, and NGC 6266 are found, and it is concluded that differential reddening is important in these clusters. Mild extinction variations are found across Omega Cen and M22, while the interstellar medium toward NGC 6397 appears fairly uniform. After taking the foreground polarization component into account, no evidence is found for significant intrinsic polarization in any of the stars observed. It is argued that an extreme Population II environment is very deficient in dust. This result is discussed in terms of different mechanisms for mass loss proposed for Population II red giants.
Claria Juan J.
Coyne George V.
~Minniti Dante
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