Interstellar matter near the Pleiades. III - A search for H2 2.4-micron vibration-rotation emission

Details Interstellar matter near the Pleiades. III - A search for H2 2.4-micron vibration-rotation emission Interstellar matter near the Pleiades. III - A search for H2 2.4-micron vibration-rotation emission

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96..145w&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, July 1988, p. 145-147.

Astronomy and Astrophysics

Astronomy

2

Emission Spectra, Hydrogen, Interstellar Gas, Interstellar Matter, Molecular Clouds, Pleiades Cluster, Gas Temperature, Line Spectra, Molecular Gases, Photodissociation

Scientific paper

Observations at 20 positions near five Pleiades stars yielded upper limits on H2 υ = 1-0 Q branch emission in the range (2.6 - 7.2)×10-5erg s-1cm-2sr-1. Corresponding limits on the column density in J = 1-5 of υ = 1 range from (1.3 - 3.7)×1015cm-2. Interpretation in terms of gas fluorescing and dissociating as it flows past the stars yields corresponding H2 density limits 400 - 1100 cm-3, values consistent with prior indirect estimates. An alternative interpretation in terms of collisional excitation yields less stringent limits.

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