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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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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.