V1647 Ori: The X-ray evolution of a Pre-main Sequence Accretion Burst

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dc.contributor.author Kastner, Joel
dc.contributor.author Richmond, Michael
dc.contributor.author Grosso, Nicolas
dc.contributor.author Weintraub, David
dc.contributor.author Simon, Theodore
dc.contributor.author Henden, Arne
dc.contributor.author Hamaguchi, Kenji
dc.contributor.author Frank, Adam
dc.contributor.author Ozawa, Hideki
dc.date.accessioned 2008-11-17T20:40:42Z
dc.date.available 2008-11-17T20:40:42Z
dc.date.issued 2006-09-01
dc.identifier.citation Astrophysical Journal Letters 648 (2008) L43-L46 en_US
dc.identifier.uri http://hdl.handle.net/1850/7539
dc.description Also archived in: arXiv:astro-ph/0607653 v1 Jul 28 2006 en_US
dc.description.abstract We present Chandra X-ray Observatory monitoring observations of the recent accretion outburst displayed by the pre-main sequence (pre-MS) star V1647 Ori. The X-ray observations were obtained over a period beginning prior to outburst onset in late 2003 and continuing through its apparent cessation in late 2005, and demonstrate that the mean flux of the spatially coincident X-ray source closely tracked the near-infrared luminosity of V1647 Ori throughout its eruption. We find negligible likelihood that the correspondence between X-ray and infrared light curves over this period was the result of multiple X-ray flares unrelated to the accretion burst. The recent Chandra data confirm that the X-ray spectrum of V1647 Ori hardened during outburst, relative both to its pre-outburst state and to the X-ray spectra of nearby pre-MS stars in the L1630 cloud. We conclude that the observed changes in the X-ray emission from V1647 Ori over the course of its 2003–2005 eruption were generated by a sudden increase and subsequent decline in its accretion rate. These results for V1647 Ori indicate that the flux of hard X-ray emission from erupting low-mass, pre-MS stars, and the duration and intensity of such eruptions, reflect the degree to which star-disk magnetic fields are reorganized before and during major accretion events. en_US
dc.language.iso en_US en_US
dc.publisher University of Chicago Press: Astrophysical Journal Letters en_US
dc.relation.ispartofseries vol. 648 en_US
dc.relation.ispartofseries no. 1 en_US
dc.relation.ispartofseries pps. L43-L46 en_US
dc.subject Stars - formation en_US
dc.subject Stars - individual (V1647 Ori) en_US
dc.subject Stars - pre-main sequence en_US
dc.subject X-rays - stars en_US
dc.title V1647 Ori: The X-ray evolution of a Pre-main Sequence Accretion Burst en_US
dc.type Article en_US

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