Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...404..631a&link_type=abstract
Astronomy and Astrophysics, v.404, p.631-636 (2003)
Astronomy and Astrophysics
Astrophysics
12
Stars: Activity, Stars: Fundamental Parameters, Stars: Late-Type
Scientific paper
We confirm the existence of an ``excess'' in the mean dereddened (U-B)0 colour of active single-lined spectroscopic giants over quiescent stars of the same spectral type and find evidence for this ``excess'' in (B-V)0, although at a lower scale, when plotted against (R-I)0. This result suggests that the use of (B-V)0 calibrations to determine fundamental parameters or spectral types for late-type active stars should be taken with caution. Since magnetic activity is definitely involved, these and similar calibrations using (U-B)0 and/or (B-V)0 should not be used for the study of late-type young clusters' members or late-type pre-main sequence stars without some consideration. Instead, near-infrared colours like (R-I)0 should be better temperature indicators for these stars.
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