Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382l..31s&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 382, Nov. 20, 1991, p. L31-L35. Research supported by NSF.
Astronomy and Astrophysics
Astrophysics
127
Molecular Clouds, Shell Stars, Stellar Envelopes, Carbon Monoxide, Pre-Main Sequence Stars
Scientific paper
High-resolution (2.7 arcsec) observations of (C-13)O (1-0) emission around the young star HL Tauri confirm the presence of circumstellar gas distributed in an elongated structure. Thermal continuum emission, centered on the stellar position, is unresolved (radius 190 AU or less) and suggests a mass equal to or greater than 0.1 solar mass. The (C-13)O extends along PA 160 deg to radii of almost 2000 AU but is less than 380 AU in width. Extended molecular emission is observed only at velocities close to the systemic value, about 6.6 km/s. Higher velocity gas, and most of the system mass, is confined to a core of radius 190 AU or less. Satellite condensations, with masses only a few percent of the main concentration, are also observed; these must be less than 100 AU in size to survive. The general form of the rotation curve is consistent with the gas moving in bound orbits about the central star. A low-velocity molecular feature, emanating from the stellar position along the disk axis, may be a low-velocity neutral flow from the disk itself.
Beckwith Steve V. W.
Sargent Anneila I.
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