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Gaia 18dvy : a new FUor in the Cygnus OB3 association.

Szegedi-Elek, E. and Ábrahám, P. and Wyrzykowski, Ł. and Kun, M. and Kóspál, Á. and Chen, L. and Marton, G. and Moór, A. and Kiss, C. and Pál, A. and Szabados, L. and Varga, J. and Varga-Verebélyi, E. and Andreas, C. and Bachelet, E. and Bischoff, R. and Bódi, A. and Breedt, E. and Burgaz, U. and Butterley, T. and Carrasco, J. M. and Čepas, V. and Damljanovic, G. and Gezer, I. and Godunova, V. and Gromadzki, M. and Gurgul, A. and Hardy, L. and Hildebrandt, F. and Hoffmann, S. and Hundertmark, M. and Ihanec, N. and Janulis, R. and Kalup, Cs. and Kaczmarek, Z. and Könyves-Tóth, R. and Krezinger, M. and Kruszyńska, K. and Littlefair, S. and Maskoliūnas, M. and Mészáros, L. and Mikołajczyk, P. and Mugrauer, M. and Netzel, H. and Ordasi, A. and Pakštienė, E. and Rybicki, K. A. and Sárneczky, K. and Seli, B. and Simon, A. and Šiškauskaitė, K. and Sódor, Á. and Sokolovsky, K. V. and Stenglein, W. and Street, R. and Szakáts, R. and Tomasella, L. and Tsapras, Y. and Vida, K. and Zdanavičius, J. and Zieliński, M. and Zieliński, P. and Ziółkowska, O. (2020) 'Gaia 18dvy : a new FUor in the Cygnus OB3 association.', Astrophysical journal., 899 (2). p. 130.


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.

Item Type:Article
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Publisher statement:© 2020. The American Astronomical Society. All rights reserved.
Date accepted:22 May 2020
Date deposited:09 September 2020
Date of first online publication:20 August 2020
Date first made open access:09 September 2020

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