Broadband photometric calibrations of Fundamental Stellar Properties for Stars in the Tycho 2 Catalog

Details Broadband photometric calibrations of Fundamental Stellar Properties for Stars in the Tycho 2 Catalog Broadband photometric calibrations of Fundamental Stellar Properties for Stars in the Tycho 2 Catalog

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20517601a&link_type=abstract

American Astronomical Society Meeting 205, #176.01; Bulletin of the American Astronomical Society, Vol. 37, p.379

Astronomy and Astrophysics

Astronomy

Scientific paper

We have developed a procedure that uniformly estimates fundamental stellar properties and errors of Tycho 2 stars using broadband photometry and proper motion only. We provide estimates of effective temperature, log(g), parallax, and absolute magnitude V for 2.4 million stars. For stars with temperature and log(g) consistent with FGK dwarfs, we also derive [Fe/H] and identify unresolved binary systems with mass ratios 1.25 < M1/M2 < 3.0 with over 30% accuracy. These estimates were produced by calibrations of B, V from Hipparcos, Tycho 2, and the UBV Photoelectric catalog, J, H, and Ks photometry from the 2MASS all-sky infrared mission, and proper motion from Hipparcos and Tycho 2. Our flux calibrations were all developed with a generalized least-squares fitting program that uses the Levenberg-Marquardt function minimization scheme. The calibrations perform as follows for stars with photometric error less than 0.5 magnitudes: Effective temperature T: +316/-522 K; surface gravity log(g): +.465/-.666 dex (cgs); parallax: +3.03/-3.96 mas; and dwarf metallicity [Fe/H]: +0.165/-0.215 dex. Our estimates of absolute magnitude, log(g), and spectral type enable us to isolate 414,371 Tycho 2 dwarfs, 384,226 of which are absent from Hipparcos, with giant and subgiant contamination at 2.6% and 6.1%, respectively. Roughly 100,000 of these stars have sufficiently low photometric errors to retain 0.2-0.3 dex [Fe/H] accuracy. The catalog of stellar properties that we derive and our generalized calibration procedure can be used to further large-scale studies of Galactic structure and chemical evolution, to construct candidate lists for targeted planet searches, and to provide potential reference stars for narrow angle astrometry programs such as SIM and Keck Interferometry.
This work has been funded by the National Science Foundation.

Affiliated with

Also associated with

No associations

Rating

Broadband photometric calibrations of Fundamental Stellar Properties for Stars in the Tycho 2 Catalog does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Broadband photometric calibrations of Fundamental Stellar Properties for Stars in the Tycho 2 Catalog, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Broadband photometric calibrations of Fundamental Stellar Properties for Stars in the Tycho 2 Catalog will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1645894