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J/A+A/397/147 Activity-rotation relationship in stars (Pizzolato+ 2003)
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Beginning of ReadMe :J/A+A/397/147 Activity-rotation relationship in stars (Pizzolato+ 2003)
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The stellar activity-rotation relationship revisited: Dependence of saturated
and non-saturated X-ray emission regimes on stellar mass for late-type dwarfs.
Pizzolato N., Maggio A., Micela G., Sciortino S., Ventura P.
<Astron. Astrophys. 397, 147 (2003)>
=2003A&A...397..147P
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ADC_Keywords: Stars, late-type ; X-ray sources ; Photometry, UBV
Keywords: stars: activity - stars: late-type - X-rays: stars
Abstract:
We present the results of a new study on the relationship between
coronal X-ray emission and stellar rotation in late-type main-sequence
stars. We have selected a sample of 259 dwarfs in the B-V range
0.5-2.0, including 110 field stars and 149 members of the Pleiades,
Hyades, alpha Persei, IC 2602 and IC 2391 open clusters. All the
stars have been observed with ROSAT, and most of them have
photometrically-measured rotation periods available. Our results
confirm that two emission regimes exist, one in which the rotation
period is a good predictor of the total X-ray luminosity, and the
other in which a constant saturated X-ray to bolometric luminosity
ratio is attained; we present a quantitative estimate of the critical
rotation periods below which stars of different masses (or spectral
types) enter the saturated regime.