Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998exdu.work..289s&link_type=abstract
Exozodiacal Dust Workshop, p. 289
Astronomy and Astrophysics
Astronomy
Stellar Envelopes, T Tauri Stars, Microwave Interferometers, Microwave Imagery, Sky Surveys (Astronomy), Nebulae, Frequency Measurement, Hubble Space Telescope, Star Formation
Scientific paper
In the nearest star-forming regions, protoplanetary disks have angular sizes of only 3-4". Millimeter interferometry has generally been limited to a resolution of 1". Groundbased coronagraphic imaging of YSOs has been restricted to radii exterior to an occulting mask (r >2"), and detect nebulosity only in the most extreme dusty systems. The Hubble Space Telescope (HST) is the only observatory which can provide a spatial resolution of approx. 10 AU in combination with a stable point-spread function for high dynamic range imaging at visual wavelengths. Since the December 1993 servicing mission, only 12 nearby young stars have been observed by HST with the sensitivity needed to detect circumstellar reflection nebulosity. All six of the classical T Tauri stars observed so far have shown nebulosity; three objects are compact bipolar nebulae without an optically visible star; and the three weak-line T Tauri stars observed show no evidence for circumstellar nebulosity. Disks have been directly observed in 3 of the 12 systems studied so far: HH 30, GM Aurigae, and Haro 6-5B. A larger survey offers the prospect of many more detections, and thereby can address such fundamental questions as: What is the frequency for direct detection of disks around premain sequence stars? What is the range of disk masses and sizes? How are disks different in binary systems? Our proposal for an HST T Tauri Star SNAPshot survey was approved for 75 targets in Cycle 7. A SNAPshot survey consists of short-duration (25 minutes or less) sequences of observations which can be used to fill gaps in the HST observing schedule. This is well-matched to the needs of disk imaging, where typical T Tauri stars (11 < V < 14) saturate the WFPC2 detectors in a minute or less. Only wide-band R and I images will be taken.
No associations
LandOfFree
The HST T tauri star SNAPshot survey 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 HST T tauri star SNAPshot survey, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The HST T tauri star SNAPshot survey will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1603790