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

**Authors:** Tigran Yu. Magakian, Elena H. Nikogossian, Tigran Movsessian, Alexei Moiseev, Colin Aspin, Chris J. Davis, Tae-Soo Pyo, Tigran Khanzadyan, Dirk Froebrich, Michael D. Smith, Gerald H. Moriarty-Schieven, Tracy L. Beck  
**arXiv:** [1304.5033](https://arxiv.org/abs/1304.5033)  
**Date:** 2013-04-18  
**Summary page:** https://www.summarizepaper.com/en/paper/1304.5033v1/

## Key points

- A study of the variable star V2494 Cyg in the L 1003 dark cloud is presented by Tigran Yu. Magakian et al.
- The star experienced a brightness increase of 2.5 mag in R (likely in the 1980s) and has since remained nearly constant.
- This event caused V2494 Cyg to illuminate a bipolar cometary nebula with similar morphological and spectral characteristics to Hubble's Variable Nebula (R Monocerotis/NGC 2261).
- The stellar spectrum exhibits several features typical of the FU Ori type, including very strong Halpha and forbidden emission lines with high-velocity components originating from 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 produces an extended outflow, making it the first known FUor with both an observed outburst and a parsec-sized HH flow.
- This study provides new insights into V2494 Cyg's unique properties within the Cygnus OB7 complex.

## Summary

A photometric and spectral study of the variable star V2494 Cyg in the L 1003 dark cloud is presented by Tigran Yu. Magakian et al. The star experienced a brightness increase of 2.5 mag in R (likely in the 1980s) and has since remained nearly constant. This event caused V2494 Cyg to illuminate a bipolar cometary nebula with similar morphological and spectral characteristics to Hubble's Variable Nebula (R Monocerotis/NGC 2261). The stellar spectrum exhibits several features typical of the FU Ori type, including very strong Halpha and forbidden emission lines with high-velocity components originating from 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. Additionally, V2494 Cyg produces an extended outflow, making it the first known FUor with both an observed outburst and a parsec-sized HH flow. This study provides new insights into V2494 Cyg's unique properties within the Cygnus OB7 complex.