SRGe J194401.8+284452—an X-ray Cataclysmic Variable in the Field of the Gamma-Ray Source 4FGL J1943.9+2841

We have carried out multiwavelength spectroscopic and photometric studies of the object SRGe J194401.8+284452 (2RXS J194401.4+284456, XMMSL2 J194402.0+284451, 2SXPS J194401.7+284450), the brightest X-ray source in the position uncertainty ellipse of the unidentified gamma-ray source 4FGL J1943.9+284...

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Главные авторы:	Kolbin, A. I., Колбин, А. И.
Формат:	Статья
Язык:	English
Опубликовано:	Pleiades Publishing 2024
Темы:	Spectroscopy Methods—photometry Stars—cataclysmic variables White dwarfs X-ray sources
Online-ссылка:	https://dspace.ncfu.ru/handle/123456789/29239
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spelling	ir-123456789-292392024-11-27T08:29:00Z SRGe J194401.8+284452—an X-ray Cataclysmic Variable in the Field of the Gamma-Ray Source 4FGL J1943.9+2841 Kolbin, A. I. Колбин, А. И. Spectroscopy Methods—photometry Stars—cataclysmic variables White dwarfs X-ray sources We have carried out multiwavelength spectroscopic and photometric studies of the object SRGe J194401.8+284452 (2RXS J194401.4+284456, XMMSL2 J194402.0+284451, 2SXPS J194401.7+284450), the brightest X-ray source in the position uncertainty ellipse of the unidentified gamma-ray source 4FGL J1943.9+2841, with the goal of determining its nature and the possible association with the gamma-ray source. The object is shown to be a cataclysmic variable with an orbital period of about 1.5 h and clear evidence for the presence of an accretion disk around the white dwarf. It can be classified by its properties as an intermediate polar whose association with the gamma-ray source is unlikely. SRGe J194401.8+284452 exhibits abrupt transitions between its high and low luminosity states simultaneously in the optical and X-ray bands, which remain relatively stable on time scales of several months/years. This may be related to the change in the accretion rate by an order of magnitude. We have obtained constraints on the mass (0.3–0.9) and temperature (K) of the accreting white dwarf in the low state, the mass of the donor star (), and the orbital inclination of the binary system (). In the low state we have detected an 8-min brightness variability in the optical band that is most likely related to the white-dwarf spin and not to the nonradial pulsations. In the high state we have revealed stochastic brightness variations on time scales of 1–15 min with amplitudes of 0.2–. SRGe J194401.8+284452 replenishes the small group of intermediate polars with the shortest orbital periods lying below the gap in the period distribution of these systems and exhibiting transitions between the states with high and low accretion rates. The brightness of the source at a level of in the 2000–8000 Å range and erg s cm in the range 0.3–10 keV makes it an interesting object for a detailed study of the physics of such systems. 2024-11-27T08:28:04Z 2024-11-27T08:28:04Z 2024 Статья Kolbin A.I., Karpova A.V., ... Malygin E.A. SRGe J194401.8+284452—an X-ray Cataclysmic Variable in the Field of the Gamma-Ray Source 4FGL J1943.9+2841 // Astronomy Letters. - 2024. - 50 (6). - pp. 351 - 372. - DOI: 10.1134/S1063773724700221 https://dspace.ncfu.ru/handle/123456789/29239 en Astronomy Letters application/pdf application/pdf Pleiades Publishing
institution	СКФУ
collection	Репозиторий
language	English
topic	Spectroscopy Methods—photometry Stars—cataclysmic variables White dwarfs X-ray sources
spellingShingle	Spectroscopy Methods—photometry Stars—cataclysmic variables White dwarfs X-ray sources Kolbin, A. I. Колбин, А. И. SRGe J194401.8+284452—an X-ray Cataclysmic Variable in the Field of the Gamma-Ray Source 4FGL J1943.9+2841
description	We have carried out multiwavelength spectroscopic and photometric studies of the object SRGe J194401.8+284452 (2RXS J194401.4+284456, XMMSL2 J194402.0+284451, 2SXPS J194401.7+284450), the brightest X-ray source in the position uncertainty ellipse of the unidentified gamma-ray source 4FGL J1943.9+2841, with the goal of determining its nature and the possible association with the gamma-ray source. The object is shown to be a cataclysmic variable with an orbital period of about 1.5 h and clear evidence for the presence of an accretion disk around the white dwarf. It can be classified by its properties as an intermediate polar whose association with the gamma-ray source is unlikely. SRGe J194401.8+284452 exhibits abrupt transitions between its high and low luminosity states simultaneously in the optical and X-ray bands, which remain relatively stable on time scales of several months/years. This may be related to the change in the accretion rate by an order of magnitude. We have obtained constraints on the mass (0.3–0.9) and temperature (K) of the accreting white dwarf in the low state, the mass of the donor star (), and the orbital inclination of the binary system (). In the low state we have detected an 8-min brightness variability in the optical band that is most likely related to the white-dwarf spin and not to the nonradial pulsations. In the high state we have revealed stochastic brightness variations on time scales of 1–15 min with amplitudes of 0.2–. SRGe J194401.8+284452 replenishes the small group of intermediate polars with the shortest orbital periods lying below the gap in the period distribution of these systems and exhibiting transitions between the states with high and low accretion rates. The brightness of the source at a level of in the 2000–8000 Å range and erg s cm in the range 0.3–10 keV makes it an interesting object for a detailed study of the physics of such systems.
format	Статья
author	Kolbin, A. I. Колбин, А. И.
author_facet	Kolbin, A. I. Колбин, А. И.
author_sort	Kolbin, A. I.
title	SRGe J194401.8+284452—an X-ray Cataclysmic Variable in the Field of the Gamma-Ray Source 4FGL J1943.9+2841
title_short	SRGe J194401.8+284452—an X-ray Cataclysmic Variable in the Field of the Gamma-Ray Source 4FGL J1943.9+2841
title_full	SRGe J194401.8+284452—an X-ray Cataclysmic Variable in the Field of the Gamma-Ray Source 4FGL J1943.9+2841
title_fullStr	SRGe J194401.8+284452—an X-ray Cataclysmic Variable in the Field of the Gamma-Ray Source 4FGL J1943.9+2841
title_full_unstemmed	SRGe J194401.8+284452—an X-ray Cataclysmic Variable in the Field of the Gamma-Ray Source 4FGL J1943.9+2841
title_sort	srge j194401.8+284452—an x-ray cataclysmic variable in the field of the gamma-ray source 4fgl j1943.9+2841
publisher	Pleiades Publishing
publishDate	2024
url	https://dspace.ncfu.ru/handle/123456789/29239
work_keys_str_mv	AT kolbinai srgej1944018284452anxraycataclysmicvariableinthefieldofthegammaraysource4fglj194392841 AT kolbinai srgej1944018284452anxraycataclysmicvariableinthefieldofthegammaraysource4fglj194392841
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SRGe J194401.8+284452—an X-ray Cataclysmic Variable in the Field of the Gamma-Ray Source 4FGL J1943.9+2841

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