Probing for Circumstellar Gas Emission Around Early-Type Stars in the Upper Scorpius OB Association

Details Probing for Circumstellar Gas Emission Around Early-Type Stars in the Upper Scorpius OB Association Probing for Circumstellar Gas Emission Around Early-Type Stars in the Upper Scorpius OB Association

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21360107d&link_type=abstract

American Astronomical Society, AAS Meeting #213, #601.07

Astronomy and Astrophysics

Astronomy

Scientific paper

We present initial results of a Spitzer Infrared Spectrograph (IRS) high resolution spectroscopic survey of 10 early (A+B spectral type) disk-bearing members of the 5 Myr old Upper Scorpius OB Association. The IRS observations are merged with optical (λλ4800-9200), near infrared (4.7-5.0 μm), and sub-millimeter (CO J=3-2) spectroscopy to probe for gas emission over the entire disk. The high resolution optical spectra were examined for broadened emission line profiles of Hα, He I λ5876, and Ca II λλ8498, 8542, 8662, established signatures of gaseous accretion. The M-band spectra were examined for CO ro-vibrational emission, a sensitive tracer of warm molecular gas. The CO J=3-2 observations probed the outer disk regions for cold gas emission. None of the early-type excess stars are found to be accreting or to exhibit CO fundamental band emission, implying that the inner ( 10 AU) disks are devoid of significant quantities of gas. Preliminary results from the analysis of the H2 S(2), S(1), and S(0) transitions place only upper limits on the remaining gas in these systems. Even more striking is the non-detection of sub-millimeter CO emission, suggesting that gas within these systems is depleted across all disk radii.

Affiliated with

Also associated with

No associations

Rating

Probing for Circumstellar Gas Emission Around Early-Type Stars in the Upper Scorpius OB Association 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 Probing for Circumstellar Gas Emission Around Early-Type Stars in the Upper Scorpius OB Association, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Probing for Circumstellar Gas Emission Around Early-Type Stars in the Upper Scorpius OB Association will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1765472