English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

V2492 Cyg is a young pre-main sequence star presenting repetitive brightnessvariations of significant amplitude (Delta R > 5 mag) whose physical origin hasbeen ascribed to both extinction (UXor-type) and accretion (EXor-type)variability, although their mutual proportion has not been clarified yet.Recently, V2492 Cyg has reached a level of brightness ever registered in theperiod of its documented activity. Optical and near-infrared photometry andspectroscopy have been obtained in October 2016 and between March and July2017. The source has remained bright until the end of May 2017, then it startedto rapidly fade since the beginning of June at a rate of about 0.08 mag/day. Onmid-July 2017 the source has reached the same low-brightness level as two yearsbefore. Extinction and mass accretion rate were derived by means of theluminosity of the brightest lines, in particular Halpha and Hbeta. A couple ofoptical high-resolution spectra are also presented to derive information on thegas kinematics. Visual extinction variations do not exceed a few magnitudes,while the mass accretion rate is estimated to vary from less than 10^-8 up to afew 10^-7 M_sun/yr. This latter is comparable to that estimated on the previoushigh-state in 2010, likely occurred under more severe extinction conditions.The combined analysis of the optical and near-infrared (NIR) observationsextends to the present event the original suggestion that the V2492 Cygvariability is a combination of changing extinction and accretion.

The 2016-2017 peak luminosity of the pre-main sequence variable V2492 Cyg