Gaia 18dvy: A New FUor in the Cygnus OB3 Association

Szegedi-Elek, E.; Ábrahám, P.; Wyrzykowski, Ł; Kun, M.; Kóspál, Á; Chen, L.; Marton, G.; Moór, A.; Kiss, C.; Pál, A.; Szabados, L.; Varga, J.; Varga-Verebélyi, E.; Andreas, C.; Bachelet, E.; Bischoff, R.; Bódi, A.; Breedt, E.; Burgaz, U.; Butterley, T.; Carrasco, J.M.; Čepas, V.; Damljanovic, G.; Gezer, I.; Godunova, V.; Gromadzki, M.; Gurgul, A.; Hardy, L.; Hildebrandt, F.; Hoffmann, S.; Hundertmark, M.; Ihanec, N.; Janulis, R.; Kalup, Cs; Kaczmarek, Z.; Könyves-Tóth, R.; Krezinger, M.; Kruszyńska, K.; Littlefair, S.; Maskoliūnas, M.; Mészáros, L.; Mikołajczyk, P.; Mugrauer, M.; Netzel, H.; Ordasi, A.; Pakštienė, E.; Rybicki, K.A.; Sárneczky, K.; Seli, B.; Simon, A.; Šiškauskaitė, K.; Sódor, Á; Sokolovsky, K.V.; Stenglein, W.; Street, R.; Szakáts, R.; Tomasella, L.; Tsapras, Y.; Vida, K.; Zdanavičius, J.; Zieliński, M.; Zieliński, P.; Ziółkowska, O.

Abstract

We present optical–infrared photometric and spectroscopic observations of Gaia 18dvy, located in the Cygnus OB3 association at a distance of 1.88 kpc. Gaia 18dvy was noted by the Gaia alerts system when its light curve exhibited a gsim4 mag rise in 2018–2019. The brightening was also observable at mid-infared wavelengths. The infrared colors of Gaia 18dvy became bluer as the outburst progressed. Its optical and near-infrared spectroscopic characteristics in the outburst phase are consistent with those of bona fide FU Orionis-type young eruptive stars. The progenitor of the outburst is probably a low-mass K-type star with an optical extinction of ~3 mag. A radiative transfer modeling of the circumstellar structure, based on the quiescent spectral energy distribution, indicates a disk with a mass of 4 × 10−3 M⊙. Our simple accretion disk modeling implies that the accretion rate had been exponentially increasing for more than 3 yr until mid-2019, when it reached a peak value of 6.9 × 10−6 M⊙ yr−1. In many respects, Gaia 18dvy is similar to the FU Ori-type object HBC 722.

Citation

Szegedi-Elek, E., Ábrahám, P., Wyrzykowski, Ł., Kun, M., Kóspál, Á., Chen, L., Marton, G., Moór, A., Kiss, C., Pál, A., Szabados, L., Varga, J., Varga-Verebélyi, E., Andreas, C., Bachelet, E., Bischoff, R., Bódi, A., Breedt, E., Burgaz, U., Butterley, T., …Ziółkowska, O. (2020). Gaia 18dvy: A New FUor in the Cygnus OB3 Association. Astrophysical Journal, 899(2), Article 130. https://doi.org/10.3847/1538-4357/aba129

• Journal Article Type: Article
• Acceptance Date: May 22, 2020
• Online Publication Date: Aug 20, 2020
• Publication Date: 2020-08
• Deposit Date: Sep 9, 2020
• Publicly Available Date: Sep 9, 2020
• Journal: Astrophysical Journal
• Print ISSN: 0004-637X
• Publisher: American Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 899
• Issue: 2
• Article Number: 130
• DOI: https://doi.org/10.3847/1538-4357/aba129
• Public URL: https://durham-repository.worktribe.com/output/1256575