NGC 2175 - The cluster age and the nature of the nebulosity surrounding S 252a

Details NGC 2175 - The cluster age and the nature of the nebulosity surrounding S 252a NGC 2175 - The cluster age and the nature of the nebulosity surrounding S 252a

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....43..259g&link_type=abstract

Astronomy and Astrophysics, vol. 43, no. 2, Oct. 1975, p. 259-265.

Astronomy and Astrophysics

Astrophysics

22

B Stars, Chronology, Galactic Clusters, Nebulae, Stellar Evolution, Ubv Spectra, Condensates, Cosmology, Galactic Evolution, Main Sequence Stars, Stellar Atmospheres, Stellar Spectra

Scientific paper

The galactic cluster NGC 2175 has been proposed as an extraordinarily young stellar association. New photometric and spectroscopic data do not support this suggestion. There do not appear to be any pre-main-sequence B stars present in the cluster. We have derived an age for the cluster of 2 million years. The physical nature of an optical nebulosity associated with the B star S 252a was investigated. It is concluded that the object is primarily a reflection nebula due to a dense neutral cloud. This cloud is surrounded by a thin, high density, low excitation ionized zone. An evolutionary model for the cloud is proposed.

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