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).
Keywords
Cite
@article{arxiv.1304.5033,
title = {V2494 Cyg: A unique FU Ori type object in the Cygnus OB7 complex},
author = {Tigran Yu. Magakian and Elena H. Nikogossian and Tigran Movsessian and Alexei Moiseev and Colin Aspin and Chris J. Davis and Tae-Soo Pyo and Tigran Khanzadyan and Dirk Froebrich and Michael D. Smith and Gerald H. Moriarty-Schieven and Tracy L. Beck},
journal= {arXiv preprint arXiv:1304.5033},
year = {2015}
}
Comments
12 pages, 5 figures. To be published in MNRAS