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First lunar occultation results from the 2.4 m Thai National Telescope equipped with ultraspec
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Richichi, A., Irawati, P., Soonthornthum, B., Dhillon, V. S. and Marsh, Tom (2014) First lunar occultation results from the 2.4 m Thai National Telescope equipped with ultraspec. The Astronomical Journal, Volume 148 (Number 5). Article number 100. doi:10.1088/0004-6256/148/5/100 ISSN 0004-6256.
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Official URL: http://dx.doi.org/10.1088/0004-6256/148/5/100
Abstract
The recently inaugurated 2.4 m Thai National Telescope (TNT) is equipped with, among other instruments, the ULTRASPEC low-noise, frame-transfer EMCCD camera. At the end of its first official observing season, we report on the use of this facility to record high time resolution imaging using small detector subarrays with a sampling as fast as several 102 Hz. In particular, we have recorded lunar occultations of several stars that represent the first contribution to this area of research made from Southeast Asia with a telescope of this class. Among the results, we discuss an accurate measurement of α Cnc, which has been reported previously as a suspected close binary. Attempts by several authors to resolve this star have so far met with a lack of unambiguous confirmation. With our observation we are able to place stringent limits on the projected angular separation (<0.''003) and brightness (Δm > 5) of a putative companion. We also present a measurement of the binary HR 7072, which extends considerably the time coverage available for its yet undetermined orbit. We discuss our precise determination of the flux ratio and projected separation in the context of other available data. We conclude by providing an estimate of the performance of ULTRASPEC at TNT for lunar occultation work. This facility can help to extend the lunar occultation technique in a geographical area where no comparable resources were available until now.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Journal or Publication Title: | The Astronomical Journal | ||||||||
| Publisher: | Institute of Physics Publishing, Inc. | ||||||||
| ISSN: | 0004-6256 | ||||||||
| Official Date: | 17 October 2014 | ||||||||
| Dates: |
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| Volume: | Volume 148 | ||||||||
| Number: | Number 5 | ||||||||
| Article Number: | Article number 100 | ||||||||
| DOI: | 10.1088/0004-6256/148/5/100 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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