2013A&A...549A..37G


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.14CEST21:35:15

2013A&A...549A..37G - Astronomy and Astrophysics, volume 549A, 37-37 (2013/1-1)

Interstellar H2 toward HD 147888.

GNACINSKI P.

Abstract (from CDS):

The ultraviolet and far-ultraviolet spectra of HD 147888 allows the H2 vibrational level ν=0 to be accessed along with higher vibrational levels of the ground H2 electronic level. The large number of H2 absorption lines in the HST spectra allows column densities to be determined even from a noisy spectra. We have determined column densities of the H2 molecule on vibrational levels ν=0-5 and rotational levels J=0-6 using the profile fitting method. No variations in the column densities of H2 on vibrationally excited levels were observed from 2000 through 2009. The ortho to para H2 ratio (O/P)* for the excited vibrational states ν=1-4 equals to 1.13. For the lowest vibrational state ν=0 and rotational level J=1 the ortho to para H2 ratio is only 0.15. The temperature of ortho-para thermodynamical equilibrium is TOP=42±3K. The measurements of H2 column densities on excited vibrational levels (from the HST spectra) leads to constraints on the radiation field in photon-dominated region (PDR) models of the interstellar cloud towards HD 147888. The Meudon PDR model locates the cloud 0.62 pc from the star. The modeled hydrogen cloud density (89-336cm–3) agrees with independent density estimations based on the C2 molecule and the chemical model. The observed (O/P)J=1 and (O/P)* H2 ratios cannot be explained by a simple model.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: molecules - ultraviolet: ISM

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 HD 34078 Or* 05 16 18.1489437436 +34 18 44.347016027 5.48 6.18 5.96     O9.5V 514 1
2 * tet01 Ori B Al* 05 35 16.112 -05 23 06.89 7.71 8.20 7.96     B1V 337 2
3 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 690 0
4 HD 37061 Or* 05 35 31.3653515656 -05 16 02.586154009 6.44 7.09 6.83     O9V 311 0
5 HD 37903 Em* 05 41 38.3889407943 -02 15 32.476182358 7.32 7.94 7.83 7.64 7.52 B3IV 316 1
6 * rho Oph D ** 16 25 24.2937199705 -23 27 36.816821785 6.71 7.05 6.74     B3/4V 187 1
7 * rho Oph A * 16 25 35.142 -23 26 49.90 4.3 5.22 5.05     B2/3V 379 0
8 NAME rho Oph A Cloud MoC 16 26 26.4 -24 22 33           ~ 235 1
9 NAME rho Oph C Cloud MoC 16 26 53.1 -24 32 31           ~ 54 0
10 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 2925 0
11 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1705 2

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2019.10.14-21:35:15

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