AAS 205th Meeting, 9-13 January 2005
Session 91 Surveys and Catalogs
Poster, Wednesday, January 12, 2005, 9:20am-6:30pm, Exhibit Hall

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[91.07] Photometric Observations of Grid Giant Star Survey Candidates

D. Bizyaev (UTEP, SAI), V.V. Smith (NOAO, UTEP), J. Arenas (CTIO), D. Geisler (Universidad de Concepcion)

We compare variability of radial velocity (RV) and brightness for a sample of red giants which were selected as candidates for the Grid Giant Star Survey (GGSS). The purpose of the survey is to select astrometrically stable stars as a reference frame for the future Space Interferometry Mission. We incorporate photometric data taken by ROTSE-I and being taken by ROTSE-IIIb robotic telescopes. Typically half of all GGSS stars to the north of DEC=-35 were observed 76 and 4 times by ROTSE-I and III respectively in white-light filters. It is shown that photometric stability at the 0.01-0.02 mag level cannot be used effectively for a pre-selection of RV-stable stars, and the most important tool remains high-resolution spectroscopy. We deeply thank the ROTSE collaboration providing us observing time at the ROTSE-IIIb telescope. We gratefully acknowledge NASA grant NRA-99-04-OSS-058.

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© 2004. The American Astronomical Society.