Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...446..267l&link_type=abstract
Astrophysical Journal v.446, p.267
Astronomy and Astrophysics
Astronomy
4
Gamma Rays: Bursts, Stars: Flare
Scientific paper
We have searched for gamma-ray bursts during stellar flares using Ulysses and BATSE/CGRO data and for a correlation between flare star positions and burst positions. More than 3000 stellar flares have been identified optically, but neither BATSE nor Ulysses observed any gamma-ray bursts which could be attributed to them. Using the BATSE trigger threshold, and the known distances to these flare stars, upper limits to the gamma-ray luminosity were obtained. We have also studied the conditions under which stellar flares could be detected by BATSE as weak GRBs. We found that if some weak events (10-7 ergs cm-2 s-1) are to be explained by flares as recently suggested, the X-ray emission (>25 keV) must be comparable to the stellar optical emission, and the ratio of Lx/Lopt Must be higher than that for solar flares by at least four orders of magnitude. The stellar flare log N-log S and spatial distributions are studied and their implications for gamma-ray bursts are discussed.
Fishman Gerald J.
Hartmann Dap
Hurley Kevein
Kouveliotou Chryssa
Li Peihua
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