An Outbursting Protostar of the FU~Orionis type in the Cygnus OB7 Molecular Cloud

Abstract

Context: To follow the early evolution of stars we need to understand how young stars accrete and eject mass. It is generally assumed that the FU Orionis phenomenon is related to the variations in the disk accretion, but many questions remain still open, in particular because of the rarity of FU Ori type stars. Aims: We explore here the characteristics of the outburst and of the environment of one new object, discovered recently in the in the active star formation region containing RNO127, within the Cygnus OB7 dark cloud complex. Methods: We present an extensive optical and near-infrared study of a new candidate of FU Orionis object, including its direct imaging, spectroscopy and scanning Fabry-Perot interferometry. Results: The source, associated with the variable reflection nebula, underwent prodigious outburst. The "Braid" nebula, which appeared in 2000, as is indicated by its name, consists of two intertwined features, illuminated by the outburst. Subsequent NIR observations revealed the bright source, which was not visible on 2MASS images, and its estimated brightening was more than 4 magnitudes. Optical and infrared spectral data show features, which are necessary for the system to be referred to as a FUor object. The bipolar optical flow directed by the axis of nebula also was found. Various estimates give the November/December 1999 as the most probable date for the eruption.

arXiv commentPreprint with high resolution images can be accessed from : http://www.astro.up.pt/~khtig/publications.php

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• A Method of Correcting Near-Infrared Spectra for Telluric Absorption
• The SCORPIO focal reducer
• High-Resolution Spectroscopy of FUors
• IRAS 05436-0007 and the Emergence of McNeil's Nebula

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• Multiwavelength Observations of V2775 Ori, an Outbursting Protostar in L 1641: Exploring the Edge of the FU Orionis Regime
• Encounter-driven accretion in young stellar clusters - A connection to FUors?
• Near-IR Variability in Young Stars in Cygnus OB7
• A 1.3 mm SMA Survey of 29 Variable Young Stellar Objects
• Near-infrared Variability among YSOs in the Star Formation Region Cygnus OB7
• The Continuing Outburst of V1647~Orionis: Winter/Spring 2011 Observations
• Photometric and spectroscopic variability of the FUor star V582 Aurigae
• V2494 Cyg: A unique FU Ori type object in the Cygnus OB7 complex
• The new nebula in LDN 1415 - A cry from the cradle of a low-luminosity source
• Astrophysics in 2006
• A Wide-Field Near-Ir H2 2.122$\mu$m line survey of the Braid Nebula Star Formation Region in Cygnus OB7
• The Local Environment of the FUor-like Objects AR 6A and 6B
• Optical Photometric Variable Stars towards Cygnus OB7