Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542513w&link_type=abstract
American Astronomical Society, AAS Meeting #215, #425.13; Bulletin of the American Astronomical Society, Vol. 42, p.338
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Johnson-Cousins UBVRIJHK color sequences in old, metal rich open cluster NGC 6791 are assembled and analyzed. Multiple color-color sequences favor a reddening that is on the mild end of recent estimates, around E(B-V) = 0.12 mag when compared to metal-sensitive color-color calibration sequences. Distance and age estimates show much larger scatter and depend strongly on isochrone author. This cluster is a Space Interferometry Mission target, and this work is a spinoff of SIM preparatory science.
The color-color calibration work is interesting in itself and shows several as yet unexploited methods for estimating the reddening, especially of sequences of KM dwarfs. Attachment of color-temperature relations yields an almost completely empirical color calibration suitable for attachment to isochrone sets at all metallicities.
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