Title: SWS H-2 observations in the BD+40 degrees 4124 group
Authors: Wesselius, PR
vandenAncker, ME
Young, ET
Clark, FO
Prusti, T
Roelfsema, PR
Waelkens, Christoffel
Wooden, DH
Boxhoorn, DR
Heras, AM
Huygen, Eric
Kester, DJM
Lahuis, F
Issue Date: Nov-1996
Publisher: Springer verlag
Series Title: Astronomy and astrophysics vol:315 issue:2 pages:L197-L200
Abstract: We report the detection of pure rotational lines of H-2 observed in the direction of three young stellar objects in the BD+40 degrees 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 approximate to 500 K for BD+40 degrees 4124 and LkH alpha 224 and approximate to 800 K for LkH alpha 225. The amounts of molecular hydrogen detected are 0.01 to 0.04 M.. 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 10-25(m) of visual extinction and is probably not directly associated with any of the optical sources.
ISSN: 0004-6361
Publication status: published
KU Leuven publication type: DI
Appears in Collections:Institute of Astronomy

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