Neues zur Urbanistik der Zivilstädte von Aquincum-Budapest und Carnuntum-Petronell

In this paper the new results of an Austrian-Hungarian research cooperation (2011–2014) on the urbanism of the Civil towns of Aquincum and Carnuntum are to be presented. In synthesis of geophysical surveys, the interpretation of archaeological excavations and the reinterpretation of elder evidences, a new picture of the diachronic development of the two Civil Towns from an early vicus to a fortified city can be drawn

Dipper-like variability of the Gaia alerted young star V555 Ori

V555 Ori is a T Tauri star, whose 1.5 mag brightening was published as a Gaia science alert in 2017. We carried out optical and near-infrared photometric, and optical spectroscopic observations to understand the light variations. The light curves show that V555 Ori was faint before 2017, entered a high state for about a year, and returned to the faint state by mid-2018. In addition to the long-term flux evolution, quasi-periodic brightness oscillations were also evident, with a period of about 5 days. At optical wavelengths both the long-term and short-term variations exhibited colourless changes, while in the near-infrared they were consistent with changing extinction. We explain the brightness variations as the consequence of changing extinction. The object has a low accretion rate whose variation in itself would not be enough to reproduce the optical flux changes. This behaviour makes V555 Ori similar to the pre-main sequence star AA Tau, where the light changes are interpreted as periodic eclipses of the star by a rotating inner disc warp. The brightness maximum of V555 Ori was a moderately obscured ($A_V$=2.3 mag) state, while the extinction in the low state was $A_V$=6.4 mag. We found that while the Gaia alert hinted at an accretion burst, V555 Ori is a standard dipper, similar to the prototype AA Tau. However, unlike in AA Tau, the periodic behaviour was also detectable in the faint phase, implying that the inner disc warp remained stable in both the high and low states of the system.Comment: Accepted to MNRA

Szemle

Szabó Miklós: Doktori képzés az ELTE Régészettudományi Intézetében; Borhy László: Válogatás a Régészeti Doktori Program doktori témáiból (ELTE BTK Régészettudományi Intézet); Kocsis László: ROMEC XV. világkonferencia Budapesten, a Magyar Nemzeti Múzeumban; Fodor István: A X. Nemzetközi Finnugor Kongresszus (Joskar-Ola, 2005. augusztus 15-21.); Siegmar von Schnurbein: A magyarországi régészeti kutatás és a Römisch-Germanische Kommission kapcsolata; Zsidi Paula: Beszámoló a Magyar Tudományos Akadémia Régészeti Bizottságának 2003-2005. évi tevékenységéről; Szabó Miklós, Raczky Pál, Zsidi Paula: Az MTA Régészeti Bizottságának szakmai javaslatai; Raczky Pál: A régészeti lelőhely fogalmának tudományfilozófiai alapon történő axiomatikus meghatározása; Jankovich-Bésán Dénes: Magyar Régész Szövetség alakul