Near-infrared H/sub 2/ emission from Herbig-Haro objects. I. A survey of low excitation objects

Journal Article · Sun Nov 01 00:00:00 EST 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165739· OSTI ID:5293786

Schwartz, R D; Cohen, M; Williams, P M

A survey for H/sub 2/ 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 H/sub 2/ 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 H/sub 2/ density and temperature ranges in these objects. The role of ultraviolet H/sub 2/ 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. 35 references.

• Research Organization: Missouri Univ., Saint Louis (USA); California Univ., Berkeley (USA); Royal Observatory, Edinburgh, Scotland (England)
• OSTI ID: 5293786
• Journal Information: Astrophys. J.; (United States), Vol. 322
• Country of Publication: United States
• Language: English

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71 CLASSICAL AND QUANTUM MECHANICS
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NEAR INFRARED RADIATION
COSMIC GASES
EMISSION SPECTRA
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NEBULAE
T TAURI STARS
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA
ELECTROMAGNETIC RADIATION
ELEMENTS
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STARS
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640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
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