Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199..465w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 199, May 1982, p. 465-470. Research supported by the British Council.
Astronomy and Astrophysics
Astronomy
15
Cosmic Dust, Gravitational Fields, Interstellar Matter, Molecular Clouds, Nebulae, Radiation Pressure, Density Distribution, Grains, Line Of Sight
Scientific paper
Bok and Reilly (1947) have pointed out the existence of small, quasi-spherical relatively opaque interstellar clouds. These clouds have become known as Bok globules. In studies of the globules conducted by Schmidt (1975) and by Bok (1977), star counts have been used to measure the extinction Av as a function of radial distance from the globule center. In the present investigation, an expression is derived for the density of grains as a function of distance from the globule center, taking into account aspects of radiation driven grain motion. From this expression the line of sight density can be calculated which in turn is converted into extinction Av. The theoretical results are compared with the observational data. Attention is given to a scenario in which dust grains settle to the center of globules due to the gravitational field. Radiation pressure also drives in grains from the surroundings to replace these grains.
Bhatt Harish C.
Williams Iwan P.
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