Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...146..175c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 146, no. 1, May 1985, p. 175-180.
Astronomy and Astrophysics
Astrophysics
21
Infrared Spectra, Stellar Envelopes, Stellar Evolution, Stellar Spectrophotometry, Abundance, H Ii Regions, Interstellar Extinction, Radiation Pressure, Spectral Energy Distribution, Stellar Models
Scientific paper
Photometric data between 2 and 20 μm for eight very young stars within M17 are presented. Combining these observations with previous UBVRIJH measurements the authors obtain energy distributions that exhibit the largest IR excesses known for optically visible stars today. From spectroscopy between 6800 and 9400 Å they derive spectral types that are very uniform, either B1 V or B2 V. Detailed radiative transfer models for the emission from these stars are constructed. Assuming that matter is distributed spherically around the stars all spectra could be fitted by a superposition of three distinct components. It is not possible to fit the data for a matter density around the stars that is constant or displays a power law distribution. The authors interpret the cocoons as remnants from the protostellar clouds and argue that the outer ones are formed by the effects of radiation pressure on the dust.
Chini Rolf
Kruegel Endrick
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