Variability in a Large Sample of Sun-Like Stars

Details Variability in a Large Sample of Sun-Like Stars Variability in a Large Sample of Sun-Like Stars

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..269f&link_type=abstract

Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held

Astronomy and Astrophysics

Astronomy

Scientific paper

At Fairborn Observatory we have observed a sample of about 350 nearby late-F to early-K dwarfs and subgiants of various ages. In particular over half of the sample are G0--G5 dwarfs. For up to a decade photometric obervations have been obtained with a nightly precision of 0.001 mag and 0.0001 mag for yearly means. Complimentary high-dispersion spectra obtained at Kitt Peak National Observatory have been used to determine spectral types radial velocities projected rotational velocities and estimate metallicities for the stars in the sample. The photometric results will be examined in the context of contemporaneous Mt. Wilson Observatory measurements of chromospheric emission a proxy for magnetic activity. Preliminary results on short-term and long-term light variability will be discussed. The Sun's position in this stellar sample will be examined.

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