Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-04-08
Astron.Astrophys. 426 (2004) 297-307
Astronomy and Astrophysics
Astrophysics
14 pages, 7 figures, accepted for publication in Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20035930
The availability of a number of new interferometric measurements of Main Sequence and subgiant stars makes it possible to calibrate the surface brightness relations of these stars using exclusively direct angular diameter measurements. These empirical laws allow to predict the limb darkened angular diameters theta_LD of dwarfs and subgiants using their dereddened Johnson magnitudes, or their effective temperature. The smallest intrinsic dispersions of sigma < 1% on theta_LD are obtained for the relations based on the K and L magnitudes, for instance log theta_LD = 0.0502 (B-L) + 0.5133 - 0.2 L or log theta_LD = 0.0755 (V-K) + 0.5170 - 0.2 K. Our calibrations are valid between the spectral types A0 and M2 for dwarf stars (with a possible extension to later types when using the effective temperature), and between A0 and K0 for subgiants. Such relations are particularly useful to estimate the angular size of calibrators for long baseline interferometry from readily available broadband photometry.
Folco E. di
Kervella Pierre
Segransan Damien
Thévenin Frédéric
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