NOAO > Observing Info > Proposals > CHARA Community Access
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NOAO > Observing Info > Proposals > CHARA Community Access |
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NOAO and Georgia State University are announcing a one-time opportunity for observations with the Center for High Angular Resolution Astronomy (CHARA) Array at Mt. Wilson Observatory. About 50 hours will be available during calendar year 2010. Observations will be carried out by CHARA staff. This is intended primarily for scientists who would benefit from a small amount of data and wish to gain experience with optical interferometry capabilities.
Requests should be submitted using the standard NOAO proposal form by selecting "CHARA" in the telescope and instrument lists, and with "nights requested" as a decimal assuming 10 hrs/night (e.g. 1.6 nights = 16 hours). Proposals must be submitted by the standard 2010A deadline of Sep 30 2009. Note that this one-time call covers all of calendar year 2010, as opposed to the six-month period of Feb-Jul 2010 for other resources in the 2010A proposal cycle.
ReSTAR and ALTAIR reports have identified community interest in optical interferometry. Foreseeing increasing community access to the CHARA Array in the future, GSU would like to gain experience with visitor access to its Mt Wilson facility. NOAO would like to learn about reviewing interferometry proposals and allocating time on an optical array. This is intended to be an introductory opportunity, and previous experience with interferometry is not required.
The best way to study the capability of the instruments is to look over some of the science papers from the array. A bibliography of CHARA Array science is available: http://www.chara.gsu.edu/CHARA/techreport.php
The following table gives a high level view of the performance for the three most mature beam combiners. CHARA has additional capabilities in various stages of commissioning - these will be made available where possible for approved programs.
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Steve Ridgway (ridgway@noao.edu) is the NOAO point of contact for proposal preparation, and he can steer you to more expert advice as needed.
If you decide to prepare a proposal, you will probably want to look at the optical interferometry planning tools supported by the NASA Exoplanet Science Institute at http://nexsciweb.ipac.caltech.edu/
There are no reserved targets or science, though proposers may optionally be put in contact with groups pursuing similar programs. NOAO policy on data proprietary period will apply.
A single "snapshop", including calibrators, requires ~30-90 minutes. This may produce between one and several dozen UV points, depending on the instrument. This amount of data can determine, for example, an angular diameter, a limb darkening strength, a binary separation, or the fraction of emission in a shell.
This call is not well suited for survey programs, for time variable studies, or for imaging of complex sources.
CHARA cannot guarantee productive observations, but is prepared to devote more telescope time than the allocated total in order to increase the odds of success.
All observing will be done by CHARA consortium staff. Visitors are welcome to travel to the Array - however, observation dates may not adhere to an advance schedule.
Consortium members will also support data reduction to Optical Interferometry FITS format, though users will probably find it interesting and not difficult to run the reduction suites.
A very complete bibliography of interferometry science is available at the OLBIN website, http://olbin.jpl.nasa.gov/papers/index.html , and may be the best guide for conventional ways to interpret data. However, optical interferometry is a young field and is wide open for new approaches.
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NOAO is operated by the
Association of Universities for Research in Astronomy (AURA),
Inc. under cooperative agreement with the
National Science Foundation.
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NOAO > Observing Info > Proposals > CHARA Community Access |
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