The 2 micron spectrum of L1551 IRS 5

Details The 2 micron spectrum of L1551 IRS 5 The 2 micron spectrum of L1551 IRS 5

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...321l..71c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 321, Oct. 1, 1987, p. L71-L74.

Astronomy and Astrophysics

Astronomy

60

Infrared Sources (Astronomy), Molecular Spectra, Nebulae, Pre-Main Sequence Stars, Spectroscopic Analysis, Carbon Monoxide, Molecular Clouds, Stellar Spectra, Water Vapor

Scientific paper

Two-micron spectroscopy of L1551 IRS 5 is presented. The main result is the presence of strong absorption in the first-overtone bands of CO. From the equivalent width of the CO bands, a spectral type of K2 III is derived. The CO bands and marginal evidence for H2O vapor absorption provide additional evidence that IRS 5 may be a member of the FU Ori class of pre-main-sequence stars. Emission lines of H2 are detected, suggesting the presence of shocked molecular gas in the vicinity of IRS 5. A marginal detection of the hydrogen Br-gamma line was also made. The measured flux limit for Br-gamma and the 6-cm radio continuum flux are consistent with optically thin recombination and not with an optically thick wind.

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