The 2018 eruption and long term evolution of the new high-mass Herbig Ae/Be object Gaia-18azl = VES 263
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY(2019)
摘要
We have been monitoring, at high cadence, the photometric and spectroscopic evolution of VES 263 following the discovery in 2018 of a brightening labelled as event Gaia-18azl. VES 263 is so far a neglected emission-line object discovered in the 1960s on objective prism plates, tentatively classified as a semiregular AGB cool giant by automated analysis of ASASSN light curves. We have discovered that VES 263 is a bona fide massive pre-main-sequence object (similar to 12M(circle dot)), of the Herbig AeBe type. It is located at 1.68 +/- 0.07kpc distance, within the Cyg OB2 star-forming region, and it is highly reddened [E(B - V) =1.80 +/- 0.05] by interstellar extinction. In quiescence, the spectral energy distribution is dominated by the similar to 20000K photospheric emission from the central B1II star, and at lambda >= 6m by emission from circumstellar warm dust (T <= 400 K). The 2018-19 eruption was caused by a marked brightening of the accretion disc around the B1II star as traced by the evolution with time of the integrated flux and the double-peaked profile of emission lines. At the peak of the eruption, the disc has a bulk temperature of similar to 7500K and a luminosity L >= 860L(circle dot), corresponding to a mass accretion rate >= 1.1x10(-5)M(circle dot) yr(-1). Spectroscopic signatures of possible bipolar jets (at -700 and +700kms(-1)) of variable intensity are found. We have reconstructed from Harvard, Moscow, and Sonneberg photographic plates the photometric history of VES 263 from 1896 to 1995.
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关键词
stars: pre-main-sequence,stars: variables: T Tauri, Herbig Ae/Be,open clusters and associations: individual: Cyg OB2
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