Absolute Magnitude Calibration for the W UMa-type Contact Binary Stars

Details Absolute Magnitude Calibration for the W UMa-type Contact Binary Stars Absolute Magnitude Calibration for the W UMa-type Contact Binary Stars

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..457r&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 457-460

Physics

2

Scientific paper

Hipparcos parallax data for 19 contact binary stars of the W UMa-type (with epsilon M_V < 0.25) are used to check the previous absolute-magnitude calibration of the form M_V = M_V (log (P),B-V), and to derive a new one. The new calibration covers the ranges 0.15 < (B-V)_0 < 0.93, 0.27 < P < 0.65 day, 1.7 < M_V < 5.5, and gives practically identical predictions for M_V as the previous one, although it is based on entirely independent M_V data, with only 2 systems common to both input datasets. The main limitations of the calibration are the inadequate quality of the ground-based photometric data and its sensitivity to the inclusion of rare systems which lie far from the general period-colour relation.

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