SWS H_2_ observations in the BD+40 4124 group.

Details SWS H_2_ observations in the BD+40 4124 group. SWS H_2_ observations in the BD+40 4124 group.

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...315l.197w&link_type=abstract

Astronomy and Astrophysics, v.315, p.L197-L200

Astronomy and Astrophysics

Astrophysics

13

Sircumstellar Matter, Stars: Formation, Stars: Pre-Main Sequence, Infrared: Stars

Scientific paper

We report the detection of pure rotational lines of H_2_observed in the direction of three young stellar objects in the BD+40 4124 group, with the short-wavelength spectrometer (SWS) on board ISO. The rotational population distributions of all three stars are consistent with a thermal distribution. The derived kinetic temperatures are =~500K for BD+40 4124 and LkHα 224 and =~800K for LkHα 225. The amounts of molecular hydrogen detected are 0.01 to 0.04 Msun_. The relative abundances of ortho- and para-hydrogen are consistent with a high temperature equilibrium distribution. We conclude that the molecular hydrogen emission in all three regions appears to lie behind approximately 10-25mag of visual extinction and is probably not directly associated with any of the optical sources.

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