27th Young Scientists' Conference on Astronomy and Space Physics

Photometric and spectrophotometric study of UGSU-type dwarf nova Gaia18awg, based on ground and space observations in optical and X-ray wavelengths (12+3)

28 Apr 2021, 17:05

15m

https://us02web.zoom.us/j/2709113918?pwd=ZnIyUml2VEN6YnkvSi90eTlwUzNLUT09

Stellar Astrophysics and Interstellar Medium

Speaker

Mr Oleksii Sokoliuk (Kyiv Astronomical Observatory, Kyiv, Ukraine)

Description

In this work we present optical, X-ray, UV photometry, X-ray spectroscopy of dwarf nova Gaia18awg (ASASSN-16le).We report an analysis of photometry, spectroscopy and measurements of physical, orbital characteristics. Gaia18awg is a U Gem + SU Uma dwarf nova system. That system showing non-periodic outbursts and super-outbursts, superhumps during superoutbursts. From Lisnyky (MPC 585) data we determined superhump period. This system shows positive (calculated) and negative (observed) superhumps with periods of 1.647 and 1.56-hr, respectively, and we identify an orbital period of 1.60-hr. We determined the hitherto unknown masses of the two components, their radii and orbital characteristics (like binary separation, semi-major and semi-minor axis). Analysis of the X-ray spectra showed strong Fe K$\alpha$ lines at 6.7-6.8KeV, Fe L complex around 1.1KeV, Ne K$\alpha$ , Mg K$\alpha$ , Si K$\beta$ lines with energies 0.9KeV, 1.3KeV, 1.83KeV respectively. EPIC-pn, RGS photometry shows dominant soft x-rays during quiescence. We interpreted this as the radiation of the boundary layer.