Computer Science
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop...53p&link_type=abstract
NOAO Proposal ID #1999A-0053
Computer Science
Scientific paper
We propose to use the University of Florida mid-IR imager/spectrometer (OSCIR) at the CTIO 4m telescope to observe a set of nearby intermediate mass (2-10 M_&sun;), pre-main-sequence stars, the Herbig stars, in the 8-20 (micron) range. These young stars have large IR excesses which are assumed to originate in circumstellar disks within which planets may be forming. However, some researchers have suggested alternative origins for the IR excess, such as spherical halos of dust, emission from PAH grains, or hidden IR-bright companions. We will observe these stars in the mid-IR where emission from warm dust dominates their flux. Our mid-IR imaging will reveal for the first time the detailed structure of the circumstellar environments. We will also conduct the first spatially resolved mid-IR spectroscopic study of these objects. Our spectroscopy will reveal the composition of the grains and determine whether silicate or PAH dust dominates the emission. We have already detected extended mid-IR emission and binary companions around two Herbig stars we observed during a recent CTIO observing run and we plan to complete our sample by observing further objects. Our final data set will be used to determine whether emission from companion objects, PAH grains, or circumstellar shells can account for the IR excesses of these stars and thereby eliminate the need for a circumstellar disk.
Polomski Elisha
Telesco Charles
No associations
LandOfFree
The Infrared Excess of Nearby Southern Herbig 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 The Infrared Excess of Nearby Southern Herbig Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Infrared Excess of Nearby Southern Herbig Stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-947492