HR 5110 superflare: an interbinary flare identified?
Identifieur interne : 000A90 ( Istex/Checkpoint ); précédent : 000A89; suivant : 000A91HR 5110 superflare: an interbinary flare identified?
Auteurs : V. G. Graffagnino [Royaume-Uni] ; D. Wonnacott [Royaume-Uni] ; S. Schaeidt [Allemagne]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 1995.
Abstract
A 73-ks pointed ROSAT observation revealed the RS CVn system HR 5110 to be in an outburst lasting over 3 d. Although the rise to outburst was not observed, over this 3-d period the PSPC count rate decayed to one-half of its initial value, which itself was some 4–5 times larger than the all-sky survey value. The count rate for the simultaneous WFC observations remained virtually constant throughout the pointing but was about a factor of 3.6 higher than its value during the all-sky survey. Calculations based on the spectral parameters show that a simple flare mechanism and standard two-ribbon flare models cannot explain the observations satisfactorily. This is the first time that such departures from a two-ribbon flare model have been identified unambiguously, and instead an interbinary flare is suggested as the cause of the outburst.
Url:
DOI: 10.1093/mnras/275.1.129
Affiliations:
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<front><div type="abstract">A 73-ks pointed ROSAT observation revealed the RS CVn system HR 5110 to be in an outburst lasting over 3 d. Although the rise to outburst was not observed, over this 3-d period the PSPC count rate decayed to one-half of its initial value, which itself was some 4–5 times larger than the all-sky survey value. The count rate for the simultaneous WFC observations remained virtually constant throughout the pointing but was about a factor of 3.6 higher than its value during the all-sky survey. Calculations based on the spectral parameters show that a simple flare mechanism and standard two-ribbon flare models cannot explain the observations satisfactorily. This is the first time that such departures from a two-ribbon flare model have been identified unambiguously, and instead an interbinary flare is suggested as the cause of the outburst.</div>
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