Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309..755b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 309, Oct. 15, 1986, p. 755-761. Research supported by the Sloan Foundation.
Astronomy and Astrophysics
Astrophysics
83
Pre-Main Sequence Stars, Stellar Envelopes, Carbon Monoxide, Continuous Spectra, Line Spectra, Mass Distribution
Scientific paper
Interferometric observations of CO (J = 1-0) emission in HL Tau and R Mon reveal small-scale concentrations of molecular gas coincident with both stars. The line widths are small, less than 3 km/s, and centered close to the stellar velocities, indicating that these condensations are bound to the stars. Lower limits to the circumstellar masses are derived from the CO measurements. HL Tau is also a source of 2.7 mm continuum radiation, which probably originates from dust near the star. Depending upon the dust emissivity law adopted, the continuum flux implies a total mass of gas and dust of 0.01 to 0.2 solar mass. These results, combined with near infrared speckle interferometry, suggest that both stars are embedded in disks with sizes and masses similar to those of the primitive solar nebula.
Beckwith Steve
Masson Colin R.
Phillips Thomas G.
Sargent Anneila I.
Scoville Nicholas Z.
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