Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263..137a&link_type=abstract
In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 137-14
Astronomy and Astrophysics
Astrophysics
4
Flare Stars, Stellar Mass Ejection, Stellar Rotation, Stellar Spectrophotometry, Exosat Satellite, H Beta Line, Iue, Space Observations (From Earth)
Scientific paper
In October 1985, observations of the M-dwarf flare star EV Lacertae were conducted for nine consecutive days with IUE, along with contemporaneous ground-based photometric and spectrophotometric coverage, and two extended pointings by EXOSAT to search for atmospheric anomalies which might help to explain the unusually violent flaring behavior of this star. On the night of 8 October 1985 all measured UV fluxes dropped by a factor 2 for 1.5 hr, apparently the result of a major episode of mass expulsion. The simultaneous Ca K (lambda 3934) and H beta light curves imply that a significant flare took place shortly before the start of the IUE observations on this night. No rotational modulation of the light curve was detected, and the mean Mg II (lamdba 2800) and C IV (lamdba 1550) fluxes are very similar to the values for YZ CMi, from which no superflares are reported.
Ambruster Carol W.
Coleman Arthur L.
Hawley Scott
Pettersen Bjorn Ragnvald
Sandmann William H.
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