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Article: The discovery of an X-ray/UV stellar flare from the late-K/early-M dwarf LMC 335

TitleThe discovery of an X-ray/UV stellar flare from the late-K/early-M dwarf LMC 335
Authors
KeywordsStars: activity
Stars: coronae
Stars: flare
Stars: individual (LMC 335)
Stars: late-type
Issue Date2012
PublisherInstitute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/
Citation
The Astrophysical Journal, 2012, v. 754 n. 2, article no. 107 How to Cite?
AbstractWe report the discovery of an X-ray/UV stellar flare from the source LMC 335, captured by XMM-Newton in the field of the Large Magellanic Cloud. The flare event was recorded continuously in X-ray for its first 10 hr from the precursor to the late decay phases. The observed fluxes increased by more than two orders of magnitude at its peak in X-ray and at least one in the UV as compared to quiescence. The peak 0.1-7.0keV X-ray flux is derived from the two-temperature APEC model to be (8.4 ± 0.6) × 10 -12ergcm -2 s -1. Combining astrometric information from multiple X-ray observations in the quiescent and flare states, we identify the NIR counterpart of LMC 335 as the Two Micron All Sky Survey source J05414534-6921512. The NIR color relations and spectroscopic parallax characterize the source as a Galactic K7-M4 dwarf at a foreground distance of (100-264)pc, implying a total energy output of the entire event of (0.4-2.9) × 10 35erg. This report comprises detailed analyses of this late-K/early-M dwarf flare event that has the longest time coverage yet reported in the literature. The flare decay can be modeled with two exponential components with timescales of 28 minutes and 4 hr, with a single-component decay firmly ruled out. The X-ray spectra during flare can be described by two components, a dominant high-temperature component of 40-60MK and a low-temperature component of 10MK, with a flare loop length of about 1.1-1.3 stellar radius. © 2012. The American Astronomical Society. All rights reserved..
Persistent Identifierhttp://hdl.handle.net/10722/164518
ISSN
2015 Impact Factor: 5.909
2015 SCImago Journal Rankings: 3.266
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorTsang, BTHen_HK
dc.contributor.authorPun, CSJen_HK
dc.contributor.authorDi Stefano, Ren_HK
dc.contributor.authorLi, KLen_HK
dc.contributor.authorKong, AKHen_HK
dc.date.accessioned2012-09-20T08:04:55Z-
dc.date.available2012-09-20T08:04:55Z-
dc.date.issued2012en_HK
dc.identifier.citationThe Astrophysical Journal, 2012, v. 754 n. 2, article no. 107en_HK
dc.identifier.issn0004-637Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/164518-
dc.description.abstractWe report the discovery of an X-ray/UV stellar flare from the source LMC 335, captured by XMM-Newton in the field of the Large Magellanic Cloud. The flare event was recorded continuously in X-ray for its first 10 hr from the precursor to the late decay phases. The observed fluxes increased by more than two orders of magnitude at its peak in X-ray and at least one in the UV as compared to quiescence. The peak 0.1-7.0keV X-ray flux is derived from the two-temperature APEC model to be (8.4 ± 0.6) × 10 -12ergcm -2 s -1. Combining astrometric information from multiple X-ray observations in the quiescent and flare states, we identify the NIR counterpart of LMC 335 as the Two Micron All Sky Survey source J05414534-6921512. The NIR color relations and spectroscopic parallax characterize the source as a Galactic K7-M4 dwarf at a foreground distance of (100-264)pc, implying a total energy output of the entire event of (0.4-2.9) × 10 35erg. This report comprises detailed analyses of this late-K/early-M dwarf flare event that has the longest time coverage yet reported in the literature. The flare decay can be modeled with two exponential components with timescales of 28 minutes and 4 hr, with a single-component decay firmly ruled out. The X-ray spectra during flare can be described by two components, a dominant high-temperature component of 40-60MK and a low-temperature component of 10MK, with a flare loop length of about 1.1-1.3 stellar radius. © 2012. The American Astronomical Society. All rights reserved..en_HK
dc.languageengen_US
dc.publisherInstitute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/en_HK
dc.relation.ispartofThe Astrophysical Journalen_HK
dc.rightsThe Astrophysical Journal. Copyright © Institute of Physics Publishing, Inc.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectStars: activityen_HK
dc.subjectStars: coronaeen_HK
dc.subjectStars: flareen_HK
dc.subjectStars: individual (LMC 335)en_HK
dc.subjectStars: late-typeen_HK
dc.titleThe discovery of an X-ray/UV stellar flare from the late-K/early-M dwarf LMC 335en_HK
dc.typeArticleen_HK
dc.identifier.emailPun, CSJ: jcspun@hkucc.hku.hken_HK
dc.identifier.authorityPun, CSJ=rp00772en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1088/0004-637X/754/2/107en_HK
dc.identifier.scopuseid_2-s2.0-84864228300en_HK
dc.identifier.hkuros211073en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84864228300&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume754en_HK
dc.identifier.issue2, article no. 107en_HK
dc.identifier.isiWOS:000306666700028-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridKong, AKH=35185316600en_HK
dc.identifier.scopusauthoridLi, KL=55321123300en_HK
dc.identifier.scopusauthoridDi Stefano, R=35737247400en_HK
dc.identifier.scopusauthoridPun, CSJ=7003931846en_HK
dc.identifier.scopusauthoridTsang, BTH=55320270700en_HK

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