Query : 2002A&A...383..919G

2002A&A...383..919G - Astronomy and Astrophysics, volume 383, 919-932 (2002/3-1)

Structure and evolution of FK Comae corona.


Abstract (from CDS):

FK Comae (HD117555) is a rapidly rotating single G giant whose distinctive characteristics include a quasisinusoidal optical light curve and high X-ray luminosity. FK Comae was observed twice at two weeks interval in January 2001 by the XMM-Newton space observatory. Analysis results suggest a scenario where the corona of FK Comae is dominated by large magnetic structures similar in size to interconnecting loops between solar active regions but significantly hotter. The interaction of these structures themselves could explain the permanent flaring activity on large scales that is responsible for heating FK Comae plasma to high temperatures. During our observations, these flares were not randomly distributed on the star surface but were partly grouped within a large compact region of about 30 degree extent in longitude reminiscent of a large photospheric spot. We argue that the α-Ω dynamo driven activity on FK Comae will disappear in the future with the effect of suppressing large scale magnetic structures in its corona.

Abstract Copyright:

Journal keyword(s): stars: individual: FK Comae - stars: activity - stars: coronae - stars: evolution - stars: late-type - X-ray: stars

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1064 0
2 V* FK Com PM* 13 30 46.7993742986 +24 13 57.786184235   9.04 8.245   7.204 G4III 356 1
3 HD 117567 * 13 30 52.2102597150 +24 14 15.415103714 8.000 8.050 7.620     F2 55 0
4 BD+24 2593B * 13 30 53.567 +24 14 19.66     13.0 12.541   ~ 3 0

    Equat.    Gal    SGal    Ecl

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