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2006MNRAS.371.1793K - Mon. Not. R. Astron. Soc., 371, 1793-1812 (2006/October-1)
Metallicity and absolute magnitude calibrations for UBV photometry.
KARATAS Y. and SCHUSTER W.J.
Abstract (from CDS):
For dwarf and turn-off stars, a new hybrid MVcalibration is presented, based on Hipparcos parallaxes with σπ/π ≤ 0.1 and with a dispersion of ±0.24 in MV. This hybrid MVcalibration contains δ0.6 and (B - V) terms, plus higher order cross-terms of these, and is valid for the ranges of +0.37 ≤ (B - V)0≤ +0.88,- 0.10 ≤ δ0.6≤ +0.29 and 3.44 ≤ MV≤ 7.23. For dwarf and turn-off stars, the relation for ΔMHV is revised and updated in terms of (B - V) and δ0.6, for the ranges of -0.10 ≤ δ0.6≤ +0.29, and +0.49 ≤ (B - V)0≤ +0.89, again making use of Hipparcos parallaxes with σπ/π ≤ 0.1. These parallaxes for metal-poor dwarf and turn-off stars in our sample reveal that the difference of ΔMH_V_(B - V) relative to Hyades at (B - V) = +0.70 should be 1.37mag, instead of the 1.58mag given by Laird et al. In general, Hipparcos parallaxes are larger than ground-based ones, causing a divergence of our ΔMHV(B - V,δ0.6) relation (the solid line in Fig. 15b), from the one of Laird et al. (the dashed line) for the range +0.10 ≤ δ0.6≤ +0.29; our absolute magnitudes are fainter, as has been confirmed for local subdwarfs by Reid. Our final calibrations for ΔMHV(B - V, δ0.6), equations (16) and (17)), are third-order polynomials in δ0.6, pass through the origin, and provide photometric distances in reasonable agreement with those obtained directly from Hipparcos parallaxes (Fig. 18).
Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS
Journal keyword(s): stars: abundances - stars: distances - solar neighbourhood
VizieR on-line data: <Available at CDS (J/MNRAS/371/1793): table1.dat refs.dat>
Simbad objects: 533
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