Extreme-Ultraviolet Flares in an F2 Star

Details Extreme-Ultraviolet Flares in an F2 Star Extreme-Ultraviolet Flares in an F2 Star

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...544..475m&link_type=abstract

The Astrophysical Journal, Volume 544, Issue 1, pp. 475-480.

Astronomy and Astrophysics

Astronomy

4

Stars: Activity, Stars: Coronae, Stars: Individual (Hr 120, 71 Taurus)

Scientific paper

We report on the coronal properties of two early F dwarfs. For both stars, spectroscopic data reveal a hot corona with material at temperatures as high as 107.1-107.2 K. The EUV photometric observations of one of the stars (HR 120: F2) reveal two large flares with rapid decay times. The rapid decays are in striking contrast with previously published slowly decaying flares on a late type F star (HR 1817: F8/9). Analysis of decay times suggests that the loop sizes which flared in the F2 star are significantly shorter than those which flared in the F8/9 star. We discuss these results in the context of a proposal made by Giampapa & Rosner.

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