Gaia 18dvy : a new FUor in the Cygnus OB3 association
Makaleler > Tam Makale · 2020
Yazarlar: 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, JM, 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, C, 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, KA, Sárneczky, K, Seli, B, Simon, A, Šiškauskaitė, K, Sódor, Á, Sokolovsky, KV, Stenglein, W, Street, R, Szakáts, R, Tomasella, L, Tsapras, Y, Vida, K, Zdanavičius, J, Zieliński, M, Zieliński, P, Ziółkowska, O
White Rose Research Online (University of Leeds, The University of Sheffield, University of York), Uluslararası, 2020
Özet
We present optical-infrared photometric and spectroscopic observations of Gaia 18dvy, 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 4 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 years 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.