2MASS J16211735+4412541 – a cataclysmic variable in disguise

Τρίτη 18 Δεκεμβρίου 2018, 12:00-13:00

ΣΧΟΛΗ ΘΕΤΙΚΩΝ ΕΠΙΣΤΗΜΩΝ ΕΚΠΑ
ΤΜΗΜΑ ΦΥΣΙΚΗΣ
ΤΟΜΕΑΣ ΑΣΤΡΟΦΥΣΙΚΗΣ ΑΣΤΡΟΝΟΜΙΑΣ ΚΑΙ ΜΗΧΑΝΙΚΗΣ

Σ Ε Μ Ι Ν Α Ρ Ι Ο

Τρίτη 18 Δεκεμβρίου 2018, 12:00-13:00

Prof. Staszek Zola
Jagiellonian University, Mt. Suhora Astronomical Observatory, Krakow, Poland

Τίτλος: 2MASS J16211735+4412541 – a cataclysmic variable in disguise

Περίληψη: 2MASS J16211735+4412541 is a short period eclipsing binary that was classified as a contact system based on its light curve gathered by large surveys. In June 2016 it unexpectedly brightened by about 2 magnitudes and stayed in this high state close to 2 weeks. The shape of the light curve changed in the outburst but within a week the system returned to its pre-outburst state. This behavior suggest the system is of a cataclysmic type.
I will present the system basic properties based on photometric, spectroscopic and X/UV data taken in 2016/17 season. I will also describe follow-up, multifilter observations taken in BVRI colors in 2017 and 2018. I will also present evolution of the system light curve shape and preliminary system modeling. We infer that the system contains an accretion disk, more than two years after the outburst, and not a bare white dwarf proposed as an alternative model.

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