Optical spectroscopy of the outflow source in L1551

Details Optical spectroscopy of the outflow source in L1551 Optical spectroscopy of the outflow source in L1551

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...288l..51s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 288, Jan. 15, 1985, p. L51-L54.

Other

49

Molecular Clouds, Optical Emission Spectroscopy, Pre-Main Sequence Stars, Carbon Monoxide, Electron Density (Concentration), H Alpha Line, Interstellar Extinction, Radial Velocity, Stellar Evolution

Scientific paper

Cassegrain spectra of the jet and the nebulosities associated with the molecular outflow region in L1551 have been used to derive radial velocities, electron densities, and extinction. The observed emission-line spectra show the characteristic features of a shock-excited gas. In the jet emanating from IRS 5, radial velocities up to -210 km/s and a mean electron density of 1000/cu cm are found. Away from the jet the average velocities are smaller. The extinction deduced from the H-alpha/H-beta ratio is rather low with values of A(v) less than 3 mag. On the other hand, an obscuration of A(v) greater than about 20 mag is derived for IRS 5 which appears to be a very young premain-sequence star of about 1 solar mass. The momentum supply rate due to the jet amounts only to about 1 percent of what is needed to drive the molecular gas.

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