Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
Flares as Heating Agents of Active Late-Type Stellar M. Audard 1;2 , M. Gudel 1;2 , J. J. Drake 3 , V. L. Kashyap 3 , E. F. Guinan 4
 

Summary: Flares as Heating Agents of Active Late-Type Stellar
Coronae?
M. Audard 1;2 , M. Gudel 1;2 , J. J. Drake 3 , V. L. Kashyap 3 , E. F. Guinan 4
Abstract.
We present results from a study of statistical ares on active late-type
stars (spectral type F to M) using Extreme Ultraviolet Explorer (EUVE )
archival data. We used several methods to investigate the are rate dis-
tributions as a function of observed EUV and X-ray emitted thermal en-
ergy (found to be dN=dE / E ); we include stars with di erent spectral
types, and di erent intrinsic parameters such as the projected rotational
velocity, the rotation period, the X-ray luminosity and the ratio LX =L bol .
We used a are identi cation method based on count distributions of
\quiescent" emission as a function of temporal bin size. Di erent types
of ts to the cumulative and di erential distributions were performed.
The derived power-law indices suggest a weak dependence on spectral
type. F and G stars are characterized by  > 2, while K and M stars
have best- t values below 2, although > 2 cannot be excluded. We
test several correlations between the above intrinsic parameters and the
power-law indices or the occurrence rates of ares with energies larger
than 10 32 ergs.

  

Source: Audard, Marc - INTEGRAL Science Data Centre & Observatory of Geneva, Université de Genève
Guedel, Manuel - Institut für Astronomie, Universität Wien

 

Collections: Physics