Circumstellar molecular gas of the HH 34 and HH 111 exciting stars

Details Circumstellar molecular gas of the HH 34 and HH 111 exciting stars Circumstellar molecular gas of the HH 34 and HH 111 exciting stars

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...408..239s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 408, no. 1, p. 239-250.

Astronomy and Astrophysics

Astrophysics

28

Herbig-Haro Objects, Molecular Gases, Pre-Main Sequence Stars, Stellar Envelopes, Carbon Monoxide, Carbon 13, Spectral Energy Distribution, Stellar Evolution

Scientific paper

The HH 34 and HH 111 exciting stars, two pre-main-sequence objects which are the sources of highly collimated optical jets, have been observed in the J = 1-0 transition of (C-13)O and in the 2.7 mm continuum using the Owens Valley Radio Observatory Millimeter Interferometer. The high-resolution aperture synthesis maps reveal dense molecular gas concentrations at the positions of both stars. The morphology and kinematics of the bright emission-line cores suggest that the molecular gas is distributed in circumstellar disks, each about 2000 AU in diameter, elongated perpendicular to each system's outflow axis. A fainter component of (C-13)O emission extends along each source's outflow axis. Independent mass determinations based on the dust continuum and molecular line fluxes indicate for HH 34, a disk mass of 0.2 solar mass; and for HH 111, a disk mass of 0.3 solar mass. The inferred circumstellar disks of these two jet sources are significantly more massive than those found associated with T Tauri stars and are therefore among the most massive disks known in association with low-mass pre-main-sequence stars.

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