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V2494 cyg: A unique FU ori type object in the cygnus OB7 complex

Magakian, Tigran Yu., Nikogossian, Elena H., Movsessian, Tigran, Moiseev, Alexei, Aspin, Colin, Davis, Chris J., Pyo, Tae-Soo, Khanzadyan, Tigran, Froebrich, Dirk, Smith, Michael D., and others. (2013) V2494 cyg: A unique FU ori type object in the cygnus OB7 complex. Monthly Notices of the Royal Astronomical Society, 432 (4). pp. 2685-2695. ISSN 0035-8711. (doi:10.1093/mnras/stt626)

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 (FUor) type, plus it exhibits very strong Ha and forbidden emissionlines with high-velocity components. These emission lines originate in the Herbig-Haro (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). © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

Item Type: Article
DOI/Identification number: 10.1093/mnras/stt626
Additional information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record "V2494 Cyg: a unique FU Ori type object in the Cygnus OB7 complex", Tigran Magakian et al., is available online at: http://www.dx.doi.org/10.1093/mnras/stt626
Uncontrolled keywords: stars, V2494 Cyg, Herbig-Haro, jets and outflows
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Giles Tarver
Date Deposited: 20 Jul 2015 13:07 UTC
Last Modified: 29 May 2019 14:51 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49554 (The current URI for this page, for reference purposes)
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