Far-infrared observations of optical emission-line stars - Evidence for extensive cool dust clouds

Details Far-infrared observations of optical emission-line stars - Evidence for extensive cool dust clouds Far-infrared observations of optical emission-line stars - Evidence for extensive cool dust clouds

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231..115h&link_type=abstract

Astrophysical Journal, Part 1, vol. 231, July 1, 1979, p. 115-123.

Astronomy and Astrophysics

Astronomy

138

Cosmic Dust, Far Infrared Radiation, Infrared Astronomy, Line Spectra, Stellar Spectra, Astronomical Models, H Ii Regions, Infrared Spectra, Photometers, Spectral Energy Distribution, T Tauri Stars

Scientific paper

Far-infrared observations (40-160 microns) of eight optical emission-line stars are presented. Six of these stars, LkH-alpha 198, T Tau, LkH-alpha 101, V380 Ori, R Mon, and MWC 1080, show substantially more far-infrared emission than would be expected on the basis of a blackbody extrapolation of their 10-20-micron fluxes. Additionally, in three cases, the far-infrared emission is shown to be spatially extended (greater than 40 arcsec). A simple model of the thermal emission from cool circumstellar dust (30-70 K) shows that these stars are surrounded by material left over from the star formation process; this result confirms the extreme youth of these stars. MWC 349 was detected at a level consistent with the expected free-free flux from its surrounding H II region, and RY Tau was not detected in the far-infrared; there is little circumstellar dust with temperatures of 20-100 K in these objects.

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