Bibcode
Zsidi, G.; Ábrahám, P.; Acosta-Pulido, J. A.; Kóspál, Á.; Kun, M.; Szabó, Zs. M.; Bódi, A.; Cseh, B.; Castro Segura, N.; Hanyecz, O.; Ignácz, B.; Kalup, Cs.; Kriskovics, L.; Mészáros, L.; Ordasi, A.; Pál, A.; Sárneczky, K.; Seli, B.; Sódor, Á.; Szakáts, R.
Bibliographical reference
The Astrophysical Journal, Volume 873, Issue 2, article id. 130, 6 pp. (2019).
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2019
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Citations
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Description
V582 Aur is a pre-main-sequence FU Orionis type eruptive star, which
entered a brightness minimum in 2016 March due to changes in the
line-of-sight extinction. Here, we present and analyze new optical B, V,
R C , and I C band multiepoch observations and
new near-infrared J, H, and K S band photometric
measurements from 2018 January–2019 February, as well as publicly
available midinfrared Wide-field Infrared Survey Explorer (WISE) data.
We found that the source shows a significant optical–near-infrared
variability, and the current brightness minimum has not completely
finished yet. If the present dimming originates from the same orbiting
dust clump that caused a similar brightness variation in 2012, then our
results suggest a viscous spreading of the dust particles along the
orbit. Another scenario is that the current minimum is caused by a dust
structure, that is entering and leaving the inner part of the system.
The WISE measurements could be consistent with this scenario. Our
long-term data, as well as an accretion disk modeling hint at a general
fading of V582 Aur, suggesting that the source will reach the quiescent
level in ∼80 yr.
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Active Galactic Nuclei (AGN) are characterized by a strong emission coming from a very compact region (only few pcs) at the galaxy center. Blazars form a class of AGN, characterized by high luminosity in a broad frequency range, from radiofrequencies to high energies (X-rays and γ -rays), as well as extreme variability and high polarization at
José Antonio
Acosta Pulido