The extreme-ultraviolet continuum of a strong stellar flare

D. J. Christian; M. Mathioudakis; D. Jevremović; J. Dupuis; S. Vennes; A. Kawka

doi:10.1086/378217

The extreme-ultraviolet continuum of a strong stellar flare

D. J. Christian^*, M. Mathioudakis, D. Jevremović, J. Dupuis, S. Vennes, A. Kawka

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

We present the serendipitous detection of an extreme-ultraviolet flare on EUVE J0613 -23.9B. The flare showed over a 200-fold increase above the quiescent emission in the DS/Lexan 60-200 Å wavelength band. Optical spectroscopy revealed that the event was associated with an active dM3.5e star. The EUVE spectra are dominated by emission lines formed at temperatures in excess of 10⁷ K. The observation is unique as we have detected, for the first time, a strong Lyman continuum in the EUVE long-wavelength range (320-650 Å). The flare in the continuum (T ≈ 20,000-30,000 K) was extremely short, lasting for less than 500 s, while in the DS (T ≈ 10 ⁷ K) its duration was ≈28 ks. The total energy of the flare in the DS is ∼3 × 10³⁴ ergs. We have made a fit to the continuum using semiempirical model atmospheres and derived the time-averaged temperature and density structures.

Original language	English
Pages (from-to)	L105-L108
Journal	Astrophysical Journal
Volume	593
Issue number	2 II
DOIs	https://doi.org/10.1086/378217
Publication status	Published - 20 Aug 2003

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@article{a238735e6f574e45883db5a05dc834f6,

title = "The extreme-ultraviolet continuum of a strong stellar flare",

abstract = "We present the serendipitous detection of an extreme-ultraviolet flare on EUVE J0613 -23.9B. The flare showed over a 200-fold increase above the quiescent emission in the DS/Lexan 60-200 {\AA} wavelength band. Optical spectroscopy revealed that the event was associated with an active dM3.5e star. The EUVE spectra are dominated by emission lines formed at temperatures in excess of 107 K. The observation is unique as we have detected, for the first time, a strong Lyman continuum in the EUVE long-wavelength range (320-650 {\AA}). The flare in the continuum (T ≈ 20,000-30,000 K) was extremely short, lasting for less than 500 s, while in the DS (T ≈ 10 7 K) its duration was ≈28 ks. The total energy of the flare in the DS is ∼3 × 1034 ergs. We have made a fit to the continuum using semiempirical model atmospheres and derived the time-averaged temperature and density structures.",

keywords = "Stars: flare, Stars: late-type, Ultraviolet: stars",

author = "Christian, {D. J.} and M. Mathioudakis and D. Jevremovi{\'c} and J. Dupuis and S. Vennes and A. Kawka",

year = "2003",

month = aug,

day = "20",

doi = "10.1086/378217",

language = "English",

volume = "593",

pages = "L105--L108",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

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TY - JOUR

T1 - The extreme-ultraviolet continuum of a strong stellar flare

AU - Christian, D. J.

AU - Mathioudakis, M.

AU - Jevremović, D.

AU - Dupuis, J.

AU - Vennes, S.

AU - Kawka, A.

PY - 2003/8/20

Y1 - 2003/8/20

N2 - We present the serendipitous detection of an extreme-ultraviolet flare on EUVE J0613 -23.9B. The flare showed over a 200-fold increase above the quiescent emission in the DS/Lexan 60-200 Å wavelength band. Optical spectroscopy revealed that the event was associated with an active dM3.5e star. The EUVE spectra are dominated by emission lines formed at temperatures in excess of 107 K. The observation is unique as we have detected, for the first time, a strong Lyman continuum in the EUVE long-wavelength range (320-650 Å). The flare in the continuum (T ≈ 20,000-30,000 K) was extremely short, lasting for less than 500 s, while in the DS (T ≈ 10 7 K) its duration was ≈28 ks. The total energy of the flare in the DS is ∼3 × 1034 ergs. We have made a fit to the continuum using semiempirical model atmospheres and derived the time-averaged temperature and density structures.

AB - We present the serendipitous detection of an extreme-ultraviolet flare on EUVE J0613 -23.9B. The flare showed over a 200-fold increase above the quiescent emission in the DS/Lexan 60-200 Å wavelength band. Optical spectroscopy revealed that the event was associated with an active dM3.5e star. The EUVE spectra are dominated by emission lines formed at temperatures in excess of 107 K. The observation is unique as we have detected, for the first time, a strong Lyman continuum in the EUVE long-wavelength range (320-650 Å). The flare in the continuum (T ≈ 20,000-30,000 K) was extremely short, lasting for less than 500 s, while in the DS (T ≈ 10 7 K) its duration was ≈28 ks. The total energy of the flare in the DS is ∼3 × 1034 ergs. We have made a fit to the continuum using semiempirical model atmospheres and derived the time-averaged temperature and density structures.

KW - Stars: flare

KW - Stars: late-type

KW - Ultraviolet: stars

UR - http://www.scopus.com/inward/record.url?scp=0242428159&partnerID=8YFLogxK

U2 - 10.1086/378217

DO - 10.1086/378217

M3 - Article

SN - 0004-637X

VL - 593

SP - L105-L108

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 II

ER -

The extreme-ultraviolet continuum of a strong stellar flare

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