2011A&A...532A.122G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:03:50

2011A&A...532A.122G - Astronomy and Astrophysics, volume 532A, 122-122 (2011/8-1)

Interstellar H2 toward HD 37903.

GNACINSKI P.

Abstract (from CDS):

We present an analysis of interstellar H2 toward object HD 37903 , which is a hot B 1.5 V star located in the NGC 2023 reflection nebula. Meyer et al. (2001ApJ...553L..59M) used a rich spectrum of vibrationally excited H2 observed by the HST to calculate a model of the interstellar cloud toward HD 37903. We extend their analysis by including the ν''=0 vibrational level observed by the FUSE satellite. The temperature calculated from the two lowest rotational levels (J''=0, 1) of the H2 molecule should not be interpreted as a ``rotational temperature'', but rather as a temperature of thermal equilibrium between the ortho and para H2. The ortho-to-para H2 ratio is lower for the lowest rotational levels than for the higher levels populated by fluorescence. The PDR model of the cloud located in front of HD 37903 points to a gas kinetic temperature ranging from 110K on the observer side of the cloud to 377K on the star side. The hydrogen density changes from nH=1874cm–3 on the observer side to 544cm–3 on the star side. The star-cloud distance in our model is 0.45pc.

Abstract Copyright:

Journal keyword(s): ISM: molecules - photon-dominated region (PDR) - ISM: general

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* AE Aur Or* 05 16 18.1489437436 +34 18 44.347016027 5.48 6.18 5.96     O9.5V 524 1
2 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 570 1
3 HD 37903 Em* 05 41 38.3889407943 -02 15 32.476182358 7.32 7.94 7.83 7.64 7.52 B3IV 322 1
4 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1723 2

    Equat.    Gal    SGal    Ecl

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2020.07.08-03:03:50

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