Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...714l..16h&link_type=abstract
The Astrophysical Journal Letters, Volume 714, Issue 1, pp. L16-L20 (2010).
Astronomy and Astrophysics
Astronomy
3
Stars: Formation, Stars: Individual: V1647 Ori, Stars: Pre-Main Sequence, X-Rays: Stars
Scientific paper
The Suzaku X-ray satellite observed the young stellar object (YSO) V1647 Ori on 2008 October 8 during the new mass accretion outburst reported in 2008 August. During the 87 ks observation with a net exposure of 40 ks, V1647 Ori showed a high level of X-ray emission with a gradual decrease in flux by a factor of 5 and then displayed an abrupt flux increase by an order of magnitude. Such enhanced X-ray variability was also seen in XMM-Newton observations in 2004 and 2005 during the 2003-2005 outburst, but has rarely been observed for other YSOs. The spectrum clearly displays emission from Helium-like iron, which is a signature of hot plasma (kT ~ 5 keV). It also shows a fluorescent iron Kα line with a remarkably large equivalent width (EW) of ~600 eV. Such a large EW suggests that a part of the incident X-ray emission that irradiates the circumstellar material and/or the stellar surface is hidden from our line of sight. XMM-Newton spectra during the 2003-2005 outburst did not show a strong fluorescent iron Kα line, so that the structure of the circumstellar gas very close to the stellar core that absorbs and re-emits X-ray emission from the central object may have changed in between 2005 and 2008. This phenomenon may be related to changes in the infrared morphology of McNeil's nebula between 2004 and 2008.
Grosso Nicolas
Hamaguchi Kenji
Kastner Joel H.
Richmond Michael
Weintraub David A.
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