期刊
ASTROPHYSICAL JOURNAL
卷 756, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/756/1/99
关键词
circumstellar matter; infrared: stars; stars: formation; stars: protostars
资金
- National Aeronautics and Space Administration (NASA) through Jet Propulsion Laboratory, California Institute of Technology (JPL/Caltech)
- NASA [NAS 5-26555]
- NASA/ESA Hubble Space Telescope [11548]
- National Science Foundation
- Wide-field Infrared Survey Explorer
- University of California, Los Angeles
- JPL/Caltech
- Cornell Atlas of Spitzer/IRS Sources
- JPL
- Division Of Physics
- Direct For Mathematical & Physical Scien [1004649] Funding Source: National Science Foundation
Individual outbursting young stars are important laboratories for studying the physics of episodic accretion and the extent to which this phenomenon can explain the luminosity distribution of protostars. We present new and archival data for V2775 Ori (HOPS 223), a protostar in the L 1641 region of the Orion molecular clouds that was discovered by Caratti o Garatti et al. to have recently undergone an order-of-magnitude increase in luminosity. Our near-infrared spectra of the source have strong blueshifted He I lambda 10830 absorption, strong H2O and CO absorption, and no H I emission, all typical of FU Orionis sources. With data from the Infrared Telescope Facility, the Two Micron All Sky Survey, the Hubble Space Telescope, Spitzer, the Wide-field Infrared Survey Explorer, Herschel, and the Atacama Pathfinder Experiment that span from 1 to 70 mu m pre-outburst and from 1 to 870 mu m post-outburst, we estimate that the outburst began between 2005 April and 2007 March. We also model the pre- and post-outburst spectral energy distributions of the source, finding it to be in the late stages of accreting its envelope with a disk-to-star accretion rate that increased from similar to 2 x 10(-6) M-circle dot yr(-1) to similar to 10(-5) M-circle dot yr(-1) during the outburst. The post-outburst luminosity at the epoch of the FU Orionis-like near-IR spectra is 28 L-circle dot, making V2775 Ori the least luminous documented FU Orionis outburster with a protostellar envelope. The existence of low-luminosity outbursts supports the notion that a range of episiodic accretion phenomena can partially explain the observed spread in protostellar luminosities.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据