학술논문
Gaia 18dvy: a new FUor in the Cygnus OB3 association
Document Type
Working Paper
Author
Szegedi-Elek, E.; Ábrahám, P.; Wyrzykowski, L.; Kun, M.; Kóspál, A.; Chen, L.; Marton, G.; Moór, A.; Kiss, Cs.; Pál, A.; Szabados, L.; Varga, J.; Varga-Verebélyi, E.; Andreas, C.; Bachelet, E.; Bischoff, R.; Bódi, A.; Breedt, E.; Burgaz, U.; Butterley, T.; 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.
Source
Subject
Language
Abstract
We present optical-infrared photometric and spectroscopic observations of Gaia18dvy, located in the Cygnus OB3 association at a distance of 1.88 kpc. The object was noted by the Gaia alerts system when its lightcurve exhibited a $\gtrsim$4 mag rise in 2018-2019. The brightening was also observable at mid-infared wavelengths. The infrared colors of Gaia18dvy 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 $\sim$3 mag. A radiative transfer modeling of the circumstellar structure, based on the quiescent spectral energy distribution, indicates a disk with a mass of $4{\times}10^{-3}\,M_{\odot}$. Our simple accretion disk modeling implies that the accretion rate had been exponentially increasing for more than 3 years until mid-2019, when it reached a peak value of $6.9 \times 10^{-6}\,M_{\odot}$yr$^{-1}$. In many respects, Gaia18dvy is similar to the FU Ori-type object HBC 722
Comment: 11 pages, 7 figures, accepted for publication in ApJ
Comment: 11 pages, 7 figures, accepted for publication in ApJ