Interstellar Molecules

Details Interstellar Molecules Interstellar Molecules

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974rspsa.340..457d&link_type=abstract

Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 340, Issue 1623, pp. 457-469

Physics

1

Scientific paper

Scans were made at the absorption wavelengths of 14 molecules resulting in the detection of three molecules: H2, HD and CO. Lines of H2 are measured in all 11 reddened stars (EB-V>0.10) analysed with f, the fraction of hydrogen in molecular form, exceeding 10-1. In eight of nine unreddened stars (EB-V<0.05) no H2 lines are detected limiting f to less than 10-7. Ratios of orthohydrogen (J = 1) to parahydrogen (J = 0) correspond to an average excitation temperature of 81 K. Two HD lines have been measured in nine stars yielding a ratio of HD to H2 of about 10-6. Consideration of the differences in self-shielding between H2 and HD for disruption by ultraviolet photons indicates that one HD molecule is formed and dissociated for about every 200 H2 molecules. Column densities for CO for four reddened stars have been determined. Ratios of the J = 1 to J = 0 rotational levels in CO yield an excitation temperature of 5 K for CO toward three stars.

Affiliated with

Also associated with

No associations

Rating

Interstellar Molecules does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Interstellar Molecules, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interstellar Molecules will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-793749