Dust cleansing of star-forming gas I. Has radiation from bright stars affected the chemical composition of the Sun and M67?

作者：Gustafsson Bengt

来源：Astronomy & Astrophysics, 2018, 616: A91.

DOI：10.1051/0004-6361/201732354

• Sun: abundances
• stars: abundances
• stars: early-type
• dust, extinction
• open clusters and associations: individual: Messier 67
• radiation mechanisms: general

Aims. We explore the possibility that solar chemical composition, as well as the similar composition of the rich open cluster M67, 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 HII 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 M67.

• 出版日期2018-8-28