Optical spectroscopy of known and suspected Herbig-Haro objects

Journal Article · Sun Sep 01 04:00:00 EDT 1985 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/163480· OSTI ID:5612472

Cohen, M; Fuller, G A

Optical spectra of a number of suspected Herbig-Haro objects are presented. From these, the nature of these nebulosities are determined. Several of the nebulae are of very high density, perhaps due to their extreme youth. Extinctions measured toward DG Tau HH and the L1551 IRS 5 optical jet are in each case substantially less than the stellar values. It is suggested that this phenomenon reflects the existence of appreciably thick circumstellar dust disks around these, and two additional, exciting stars. Shock model diagnostics suggest that the emission lines in these Herbig-Haro nebulae arise in modest velocity shocks with sizable preshock densities in several cases. Radial velocities enable lower limits to be placed on the mass loss rates of those stars that have been detected in the radio continuum. 39 references.

• Research Organization: NASA, Ames Research Center, Moffett Field, CA; California Univ., Berkeley
• OSTI ID: 5612472
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 296; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC DUST
DUSTS
EMISSION SPECTRA
MAIN SEQUENCE STARS
MASS TRANSFER
NEBULAE
RADIAL VELOCITY
SPECTRA
STAR EVOLUTION
STARS
VELOCITY
VISIBLE SPECTRA