Detection of a strong stellar flare from euve J1438-432

D. J. Christian; S. Vennes

doi:10.1086/300809

Detection of a strong stellar flare from euve J1438-432

D. J. Christian^*, S. Vennes

^*Corresponding author for this work

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

4 Citations (Scopus)

Abstract

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 Å) 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.

Original language	English
Pages (from-to)	1852-1856
Number of pages	5
Journal	Astronomical Journal
Volume	117
Issue number	4
DOIs	https://doi.org/10.1086/300809
Publication status	Published - Apr 1999

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title = "Detection of a strong stellar flare from euve J1438-432",

abstract = "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 {\AA}) 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.",

keywords = "Stars: Flare, Stars: Late-type, Ultraviolet emission",

author = "Christian, \{D. J.\} and S. Vennes",

year = "1999",

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doi = "10.1086/300809",

language = "English",

volume = "117",

pages = "1852--1856",

journal = "Astronomical Journal",

issn = "0004-6256",

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TY - JOUR

T1 - Detection of a strong stellar flare from euve J1438-432

AU - Christian, D. J.

AU - Vennes, S.

PY - 1999/4

Y1 - 1999/4

N2 - 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 Å) 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.

AB - 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 Å) 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.

KW - Stars: Flare

KW - Stars: Late-type

KW - Ultraviolet emission

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U2 - 10.1086/300809

DO - 10.1086/300809

M3 - Article

SN - 0004-6256

VL - 117

SP - 1852

EP - 1856

JO - Astronomical Journal

JF - Astronomical Journal

IS - 4

ER -

Detection of a strong stellar flare from euve J1438-432

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