V1647 ORIONIS: Keck/Nirspec 2 MICRON Echelle Observations

Abstract

We present new Keck II NIRSPEC high-spectral resolution 2 um echelle observations of the young eruptive variable star V1647 Orionis. This star went into outburst in late 2003 and faded to its pre-outburst brightness after approximately 26 months. V1647 Orionis is the illuminating star of McNeil's Nebula and is located near M 78 in the Lynds 1630 dark cloud. Our spectra have a resolving power of approximately 18,000 and allow us to study in detail the weak absorption features present on the strong near-IR veiled continuum. An analysis of the echelle orders containing Mg I (2.1066 um) and Al I (2.1099 um), Br-gamma (2.1661 um), the Na I doublet (2.206 and 2.209 um), and the CO overtone bandhead (2.2935 um) gives us considerable information on the physical and geometric characteristics of the regions producing these spectral features. We find that, at high-spectral resolution, V1647 Orionis in quiescence resembles a significant number of FU Orionis type eruptive variables and does not appear similar to the quiescent EX Lupi variables observed. This correspondence is discussed and implications for the evolutionary state of the star are considered.

37 pages, 3 Tables, 17 Figures

References in corpus (13)

• Using FU Orionis Outbursts to Constrain Self-Regulated Protostellar Disk Models
• The Physical Natures of Class I and Flat-Spectrum Protostellar Photospheres: A Near-Infrared Spectroscopic Study
• IRAS 05436-0007 and the Emergence of McNeil's Nebula
• Mc Neil's Nebula in Orion: The Outburst History
• The outburst of the eruptive young star OO Serpentis between 1995 and 2006
• High Resolution Near-Infrared Spectroscopy of FUors and FUor-like stars
• Mid-Infrared and Submillimeter Observations of the Illuminating Source of McNeil's Variable Nebula
• Near-Infrared Spectroscopy of McNeil's Nebula Object
• The infrared properties of the new outburst star IRAS 05436-0007 in quiescent phase
• V1647 Orionis: One Year into Quiescence
• Optical and infrared properties of V1647 Orionis during the 2003-2006 outburst. II. Temporal evolution of the eruptive source
• V1647 Ori (IRAS 05436-0007) in Outburst: the First Three Months
• Post-Outburst Observations of V1647 Ori: Detection of a Brief Warm, Molecular Outflow

Cited by in corpus (9)

• A population of eruptive variable protostars in VVV
• Infrared spectroscopy of eruptive variable protostars from VVV
• V1647 Orionis: Optical Photometric and Spectroscopic Monitoring Through the 2003-2006 Outburst
• The New EXor Outburst of ESO-H-alpha~99 observed by Gaia ATLAS and TESS
• The Continuing Outburst of V1647~Orionis: Winter/Spring 2011 Observations
• EXORCISM: a spectroscopic survey of young eruptive variables (EXor and candidates)
• Periodic Accretion Instabilities in the Protostar L1634 IRS 7
• Near Infrared Spectroscopic Study of V1647 Ori
• High Cadence Time-Series Photometry of V1647 Orionis