V2494 Cyg: A unique FU Ori type object in the Cygnus OB7 complex

Abstract

A photometric and spectral study of the variable star V2494 Cyg in the L 1003 dark cloud is presented. The brightness of the star, formerly known as HH 381 IRS, increased by 2.5 mag in R (probably in the 1980s) and since then has remained nearly constant. Since the brightness increase, V2494 Cyg has illuminated a bipolar cometary nebula. The stellar spectrum has several features typical of the FU Ori type, plus it exhibits very strong Halpha and forbidden emission lines with high-velocity components. These emission lines originate in the HH jet near the star. The kinematic age of the jet is consistent with it forming at the time of the outburst leading to the luminosity increase. V2494 Cyg also produces a rather extended outflow; it is the first known FUor with both an observed outburst and a parsec-sized HH flow. The nebula, illuminated by V2494 Cyg, possesses similar morphological and spectral characteristics to Hubble's Variable Nebula (R Monocerotis/NGC 2261).

12 pages, 5 figures. To be published in MNRAS

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Cited by in corpus (15)

• A Near-IR Spectroscopic Survey of FU Orionis Objects
• Infrared spectroscopy of eruptive variable protostars from VVV
• Distinguishing between different mechanisms of FU-Orionis-type luminosity outbursts
• A 1.3 mm SMA Survey of 29 Variable Young Stellar Objects
• Extreme Infrared Variables from UKIDSS - I. A Concentration in Star Forming Regions
• High-resolution spectroscopic monitoring observations of FU Orionis-type object, V960 Mon
• Photometric and spectroscopic study of the EXor-like eruptive young star Gaia19fct
• The Spectroscopic Variations of the FU Orionis Object V960 Mon
• A Study of Millimeter Variability in FUor Objects
• Spectroscopy of 9 eruptive young variables using TANSPEC
• A Study of Mid-Infrared Sources that Dramatically Brightened
• PV Cep and V350 Cep: stars on the way between FUors AND EXors
• Molecular inventory of a young eruptive star's environment -- Case study of the classical FU Orionis star V1057 Cyg
• Optical Photometric Variable Stars towards Cygnus OB7
• A study of the photometric and spectroscopic variations of the prototypical FU Orionis-type star V1057 Cyg