文章基本信息

标题：Dust cleansing of star-forming gas
其他标题：I. Has radiation from bright stars affected the chemical composition of the Sun and M 67?
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作者：Bengt Gustafsson
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2018
卷号：616
DOI：10.1051/0004-6361/201732354
语种：English
出版社：EDP Sciences
摘要：Aims. We explore the possibility that solar chemical composition, as well as the similar composition of the rich open cluster M 67, have been affected by dust cleansing of the presolar or precluster cloud due to the radiative forces from bright early-type stars in its neighbourhood.Methods. We estimate possible cleansing effects using semi-analytical methods, which are essentially based on momentum conservation.Results. Our calculations indicate that the amounts of cleansed neutral gas are limited to a relatively thin shell surrounding the H II region around the early-type stars.Conclusions. It seems possible that the proposed mechanism acting in individual giant molecular clouds may produce significant abundance effects for masses corresponding to single stars or small groups of stars. The effects of cleansing are, however, severely constrained by the thinness of the cleansed shell of gas and by turbulence in the cloud. This is why the mechanism can hardly be important in cleansing masses corresponding to rich clusters, such as the mass of the original M 67.
关键词：enSun: abundancesstars: abundancesstars: early-typedustextinctionopen clusters and associations: individual: Messier 67radiation mechanisms: general