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2020ApJ...899..130S - Astrophys. J., 899, 130-130 (2020/August-3)

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

SZEGEDI-ELEK E., ABRAHAM P., WYRZYKOWSKI L., KUN M., KOSPAL A., CHEN L., MARTON G., MOOR A., KISS C., PAL A., SZABADOS L., VARGA J., VARGA-VEREBELYI E., ANDREAS C., BACHELET E., BISCHOFF R., BODI A., BREEDT E., BURGAZ U., BUTTERLEY T., CARRASCO J.M., CEPAS 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., KONYVES-TOTH R., KREZINGER M., KRUSZYNSKA K., LITTLEFAIR S., MASKOLIUNAS M., MESZAROS L., MIKOLAJCZYK P., MUGRAUER M., NETZEL H., ORDASI A., PAKSTIENE E., RYBICKI K.A., SARNECZKY K., SELI B., SIMON A., SISKAUSKAITE K., SODOR A., SOKOLOVSKY K.V., STENGLEIN W., STREET R., SZAKATS R., TOMASELLA L., TSAPRAS Y., VIDA K., ZDANAVICIUS J., ZIELINSKI M., ZIELINSKI P. and ZIOLKOWSKA O.

Abstract (from CDS):

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 >=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 x 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 x 10–6 M☉ yr–1. In many respects, Gaia 18dvy is similar to the FU Ori-type object HBC 722.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Star formation - Accretion - Protoplanetary disks - Eruptive variable stars

VizieR on-line data: <Available at CDS (J/ApJ/899/130): table1.dat>

Simbad objects: 16

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