Near-infrared H2 emission from Herbig-Haro objects. I - A survey of low excitation objects

Details Near-infrared H2 emission from Herbig-Haro objects. I - A survey of low excitation objects Near-infrared H2 emission from Herbig-Haro objects. I - A survey of low excitation objects

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...322..403s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 322, Nov. 1, 1987, p. 403-411. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

44

H Lines, Herbig-Haro Objects, Near Infrared Radiation, Nebulae, Pre-Main Sequence Stars, Stellar Spectra, Emission Spectra, Hydrogen, Molecular Clouds, T Tauri Stars

Scientific paper

A survey for H2 1-0 S(1) emission in 16 Herbig-Haro (HH) objects and three exciting stars for HH objects is reported. Eleven HH objects which show low-excitation optical spectra exhibit H2 emission. One object (HH 43) is more than twice as bright as any previously reported HH object. In addition, spectra in the range 1.6-2.55 microns are reported for HH 43 and HH 120, and a 2.0-2.55 micron spectrum is presented for HH 26. The spectra yield estimates of the H2 density and temperature ranges in these objects. The role of ultraviolet H2 emission-line fluorescence in HH 43 with respect to cascading among excited vibrational states of the ground electronic state is discussed. Models which may account for the combined ultraviolet, optical, and near-IR spectra of HHs are briefly analyzed.

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