Detection of a Strong Stellar Flare from EUVE J1438−432 | Zendy

D. J. Christian | Zendy; S. Vennes | Zendy

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Detection of a Strong Stellar Flare from EUVE J1438−432

Author(s) -

D. J. Christian,

S. Vennes

Publication year - 1999

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/300809

Subject(s) - physics , flare , astrophysics , extreme ultraviolet lithography , extreme ultraviolet , balmer series , stars , luminosity , flare star , astronomy , emission spectrum , spectral line , t tauri star , k type main sequence star , galaxy , optics , laser

We present extreme-ultraviolet (EUV) observations of a strong flare from EUVE J1438-432, a source serendipitously detected with the Extreme Ultraviolet Explorer (EUVE) Right Angle Program. The flare was detected in the Lexan/boron (100 A) band and showed a 16-fold increase over quiescent emission with a rise time of ~10 ks and a decay time of ~40 ks. Optical spectroscopy of objects within the EUVE pointing uncertainty circle revealed a pair of late-type stars (WT 486 and WT 487) both showing Balmer series in emission; either star is a good candidate for production of the flare. The peak luminosity of the flare is 5.7 × 1029 ergs s-1 with a total energy of ~5 × 1033 ergs. The flare energetics are about 2 orders of magnitude lower than the large EUV flare detected from AU Mic in 1992, but similar to other EUV-detected flares from late-type stars.

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