2001A&A...365L.336G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST06:00:13

2001A&A...365L.336G - Astronomy and Astrophysics, volume 365, L336-343 (2001/1-1)

The XMM-Newton view of stellar coronae: X-ray spectroscopy of the corona of AB Doradus.

GUEDEL M., AUDARD M., BRIGGS K., HABERL F., MAGEE H., MAGGIO A., MEWE R., PALLAVICINI R. and PYE J.

Abstract (from CDS):

We report results of deep X-ray observations of AB Doradus obtained with the XMM-Newton observatory during its Performance Verification phase. The main objective of the analysis is a study of the spectral variability of coronal plasma in a very active star, including investigations of the variable thermal structure, abundance variations, and possible density changes during flares. AB Dor revealed both quiescent and flaring emission. The RGS spectra show flux changes in lines of highly ionized Fe during the flares, and an increase of the continuum. Elemental abundances increase in the early flare phases, by a factor of three. The quiescent abundances are lower than corresponding solar photospheric values, and tend to increase with increasing first ionization potential, contrary to the behavior in the solar corona. High-resolution spectra show an average density of the cool plasma of ≃3x1010cm–3; this value does not change during the flares. We analyse and model the temporal behavior of heating and cooling, and present model results for one of the flares. We find that magnetic loops with a semilength of the order of 2.5x1010cm ≃0.3R* are involved.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: activity - stars: coronae - stars: flare - stars: individual: AB Doradus - X-rays: stars

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 22468 RS* 03 36 47.2911034958 +00 35 15.938962144 7.09 6.63   5.4   K2:Vnk 1124 0
2 HD 36705 TT* 05 28 44.8916324761 -65 26 55.289846904 8.259 7.856 6.999 6.496 5.993 K0V 931 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-06:00:13

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