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Photometric and spectroscopic study of the EXor-like eruptive young star Gaia19fct
Sunkyung Park, Ágnes Kóspál, Péter Ábrahám +19
Gaia19fct is one of the Gaia-alerted eruptive young stars that has undergone several brightening events. We conducted monitoring observations using multi-filter optical and near-in…
Optical variability of eight FRII-type quasars with 13-yr photometric light curves
Agnieszka Kuźmicz, Arti Goyal, Stanisław Zola +7
We characterize the optical variability properties of eight lobe-dominated radio quasars (QSOs): B2 070937, FBQS J095206.3235245, PG 1004130, [HB89] 1156631, [HB89] 142…
Photometric and spectroscopic study of the burst-like brightening of two Gaia-alerted young stellar objects
Zsófia Nagy, Péter Ábrahám, Ágnes Kóspál +18
Young stars show variability on different time-scales from hours to decades, with a range of amplitudes. We studied two young stars, which triggered the Gaia Science Alerts system…
A multi-epoch, multi-wavelength study of the classical FUor V1515 Cyg approaching quiescence
Zs. M. Szabó, Á. Kóspál, P. Ábrahám +28
Historically, FU Orionis-type stars are low-mass, pre-main sequence stars. The members of this class experience powerful accretion outbursts and remain in an enhanced accretion sta…
Host galaxy magnitude of OJ 287 from its colours at minimum light
Mauri J. Valtonen, Lankeswar Dey, S. Zola +54
OJ 287 is a BL Lacertae type quasar in which the active galactic nucleus (AGN) outshines the host galaxy by an order of magnitude. The only exception to this may be at minimum ligh…
The disk of FU Orionis viewed with MATISSE/VLTI: first interferometric observations in and bands
F. Lykou, P. Ábrahám, L. Chen +30
The disk of FU Orionis is marginally resolved with MATISSE, suggesting that the region emitting in the thermal infrared is rather compact. An upper limit of mas (in…