Photometric Observations of Grid Giant Star Survey Candidates

Details Photometric Observations of Grid Giant Star Survey Candidates Photometric Observations of Grid Giant Star Survey Candidates

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.9107b&link_type=abstract

American Astronomical Society Meeting 205, #91.07; Bulletin of the American Astronomical Society, Vol. 36, p.1488

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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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