Query : 2004A&A...414L...5J

2004A&A...414L...5J - Astronomy and Astrophysics, volume 414, L5-8 (2004/1-4)

Coronal stripping in supersaturated stars.


Abstract (from CDS):

A recent unambiguous detection of X-ray rotational modulation of the supersaturated star VXR45 (P=0.223days) has shown that its corona has discrete dark and bright X-ray regions. We suggest that due to the rapid rotation, the X-ray emitting corona has been centrifugally stripped away, creating open field regions that are dark in X-rays. This leads naturally both to a significant rotational modulation in X-rays but also to the lower X-ray luminosity of supersaturated stars compared to those rotating more slowly. To demonstrate the effect, we take as an example a more slowly rotating star for which surface magnetograms are available. We extrapolate the potential coronal magnetic field based on these magnetograms and determine for a hydrostatic, isothermal atmosphere the structure of the density and of the optically-thin X-ray emission. We show that if the rotation rate of this star were increased, the magnitude of the X-ray luminosity would decrease while its rotational modulation would increase in a way that is consistent with the recent observations of VXR45.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: coronae - stars: late-type - stars: magnetic fields - stars: rotation - X-ray: stars

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 V* AB Dor TT* 05 28 44.8712165880 -65 26 55.199147208 8.259 7.856 6.999 6.496 5.993 K0V 1015 0
2 IC 2391 OpC 08 41 10.1 -52 59 28           ~ 816 0
3 V* V370 Vel BY* 08 42 14.7556955232 -52 56 02.325566004   11.775 10.827 10.541 9.620 G9V 38 0

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