Modeling the gas reservoir of circumstellar disks around young G-type stars

Details Modeling the gas reservoir of circumstellar disks around young G-type stars Modeling the gas reservoir of circumstellar disks around young G-type stars

2004-07-28

arxiv.org/abs/astro-ph/0407578v1

Astron.Astrophys. 427 (2004) 561-566

Astronomy and Astrophysics

Astrophysics

8 pages, 6 figures, A&A accepted

Scientific paper

10.1051/0004-6361:20034235

Interpretation of molecular line observations in tenuous circumstellar disks around young G-type stars in terms of a disk mass is difficult without a model that describes the chemical structure of these disks. This paper now discusses the chemistry in tenuous disks around young solar-type stars based on disk models that take into account the presence of a stellar chromosphere. The example of the disk around a 70 Myr old solar-type star shows that the dissociating radiation from the chromosphere is stronger than the interstellar ultraviolet radiation field up to a distance of ~400 AU from the star. Similar to other studies in this research field, it is found that, due to photodissociation, the CO-to-H_2 ratio is far from the canonical value of 10^-4 for molecular clouds. Moreover, the dust-to-gas mass ratio, as well as the dust grain size play an important role for the H_2 abundance in these disks.

Affiliated with

Also associated with

No associations

Rating

Modeling the gas reservoir of circumstellar disks around young G-type stars 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 Modeling the gas reservoir of circumstellar disks around young G-type stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modeling the gas reservoir of circumstellar disks around young G-type stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-622239