Document Type

Article

Publication Date

4-1-2006

Publication Title

The Astrophyical Journal

Volume

641

Publisher

The American Astronomical Society

Abstract

V1647 Ori is a low mass star in the L1630 star-forming region that underwent an outburst in late 2003/early 2004. We present post-outburst infrared spectra obtained with NIRSPEC (Keck II) and SpeX (IRTF) and compare these to spectra taken during the outburst. The results show that the temperature of the hot CO formed in the inner part of the disk has declined by ~800 K, while the water and CO ice and low-J CO gas features remained unchanged, consistent with previous assertions that the latter, low-temperature features arise in the foreground cloud. The P-Cygni profiles of the Paschen series that were present in the outburst spectra taken in March 2004 disappeared by late 2004. The equivalent width of the helium absorption line at 1.0830 µm decreased from 8.9 Å to 3.9 Å between March and November 2004, evidence that the hot, fast wind has decreased substantially. We discuss the implications for categorizing V1647 Ori among the known classes of outbursting young stars.

Comments

This article has been published in the Astrophysical Journal. Please find the published version here (note that a subscription may be necessary to access this version):

http://iopscience.iop.org/0004-637X/641/1/383/pdf/63961.web.pdf

The American Astronomical Society holds the copyright in this article.

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