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HD 43125


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VLT-ISAAC 3-5 mu m spectroscopy as a new tool for investigating H2 emission in protostellar jets
We report 3-5 mu m IR spectroscopy obtained with VLT-ISAAC on the IRS17molecular hydrogen jet in the Vela-D Molecular Cloud. Together withH2 emission lines from the v = 1 rovibrational state, thespectra show several pure rotational lines of the fundamental state withexcitation temperature up to ~ 22 000 K. We show how theoreticalrotation diagrams indicate these lines as unique both to probe thepresence of collisionally excited gas in NLTE conditions and to inferthe gas density.

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Observation and Astrometry data

Constellation:Lynx
Right ascension:06h17m59.66s
Declination:+56°37'31.6"
Apparent magnitude:8.578
Distance:452.489 parsecs
Proper motion RA:-1.2
Proper motion Dec:-15.1
B-T magnitude:10.206
V-T magnitude:8.713

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 43125
TYCHO-2 2000TYC 3772-2450-1
USNO-A2.0USNO-A2 1425-06515909
HIPHIP 29924

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