Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391..805n&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 2, June 1, 1992, p. 805-816. Research supported by ASI.
Astronomy and Astrophysics
Astronomy
50
Infrared Astronomy, Infrared Stars, Pre-Main Sequence Stars, Spectral Energy Distribution, Stellar Envelopes, Stellar Luminosity, Near Infrared Radiation, Star Formation, Stellar Mass
Scientific paper
The paper presents FIR scans of LkHα 198 at 50 and 100 microns along several directions; the observations reveal an extended, roughly spherical source diameter of 33 arcsec, or 20,000 AU, at 100 microns and not more than 10 arcsec, or 15,000 AU, at 50 microns. A luminosity of 250 solar luminosities at a distance of 600 pc is estimated on the basis of a comparison of the observed properties at optical, IR, and millimeter wavelengths with the predictions of radiation transfer models. The optical depth at 100 microns is 0.004-0.006, implying a mass of about 2 solar masses with a radius of 10,000 AU. It is argued that the inner radius of the dusty envelope is rather small, less than about 300 AU (0.5 arcsec), and it may be as small as the dust destruction front: in LkHα 198 there is no evidence of a large region devoid of grains.
Butner Harold M.
Evans Neal J. II
Harvey Paul Michael
Natta Antonella
Palla Francesco
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