FUSE observations of molecular hydrogen on the line of sight towards HD141569A

Details FUSE observations of molecular hydrogen on the line of sight towards HD141569A FUSE observations of molecular hydrogen on the line of sight towards HD141569A

2005-06-13

arxiv.org/abs/astro-ph/0506276v1

Astronomy and Astrophysics

Astrophysics

accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20042559

We present an analysis of the Far Ultraviolet Spectroscopic Explorer (FUSE) spectrum of HD141569A, a transitional object known to possess a circumstellar disk. We observe two components of gas at widely different temperatures along the line of sight. We detect cold H2, which is thermalized up to J=2 at a kinetic temperature of 51K. Such low temperatures are typical of the diffuse interstellar medium. Since the line of sight to HD141569A does not pass through its disk, it appears that we are observing the cold H2 in a low extinction envelope associated with the high Galactic latitude dark cloud complex L134N, which is in the same direction and at nearly the same distance as HD141569A. The column densities of the higher J-levels of H2 suggest the presence of warm gas along the line of sight. The excitation conditions do not seem to be consistent with what is generally observed in diffuse interstellar clouds. The observed radial velocity of the gas implies that the UV spectral lines we observe are likely interstellar in origin rather than circumstellar, although our absorption line study does not definitely rule out the possibility that the warm gas is close to the star. The discovery of such warm gas along the line of sight may provide evidence for turbulent phenomena in the dark cloud L134N.

Affiliated with

Also associated with

No associations

Rating

FUSE observations of molecular hydrogen on the line of sight towards HD141569A 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 FUSE observations of molecular hydrogen on the line of sight towards HD141569A, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and FUSE observations of molecular hydrogen on the line of sight towards HD141569A will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-649991