Detailed Information on Publication Record

ABRAMOWICZ, Marek and M. WIELGUS. Oscillations of the Eddington capture sphere. Astronomy & Astrophysics. FR - Francouzská republika, 2012, vol. 545, A123, 3 pp. ISSN 0004-6361. Available from: https://dx.doi.org/10.1051/0004-6361/201220228.

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Basic information
Original name	Oscillations of the Eddington capture sphere
Authors	ABRAMOWICZ, Marek and M. WIELGUS.
Edition	Astronomy & Astrophysics, FR - Francouzská republika, 2012, 0004-6361.

Other information
Original language	English
Type of outcome	Article in a journal
Field of Study	10308 Astronomy
Confidentiality degree	is not subject to a state or trade secret
WWW	URL
Organization unit	Faculty of Philosophy and Science in Opava
Doi	http://dx.doi.org/10.1051/0004-6361/201220228
UT WoS	000309254900123
Keywords in English	Accretion; Accretion disks; Gravitation; Relativistic processes; Stars: neutron; X-rays: binaries
Tags	FÚ
Tags	International impact, Reviewed
Changed by	Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 15/4/2021 10:01.

Abstract
We present a toy model of mildly super-Eddington, optically thin accretion onto a compact star in the Schwarzschild metric, which predicts periodic variations of luminosity when matter is supplied to the system at a constant accretion rate. These are related to the periodic appearance and disappearance of the Eddington capture sphere. In the model the frequency is found to vary inversely with the luminosity. If the input accretion rate varies (strictly) periodically, the luminosity variation is quasi-periodic, and the quality factor is inversely proportional to the relative amplitude of mass accretion fluctuations, with its largest value Q approximate to 1/(10\|delta(M)over dot/(M)over dot\|) attained in oscillations at about 1 to 2 kHz frequencies for a2 M-circle dot star.

Abstract

We present a toy model of mildly super-Eddington, optically thin accretion onto a compact star in the Schwarzschild metric, which predicts periodic variations of luminosity when matter is supplied to the system at a constant accretion rate. These are related to the periodic appearance and disappearance of the Eddington capture sphere. In the model the frequency is found to vary inversely with the luminosity. If the input accretion rate varies (strictly) periodically, the luminosity variation is quasi-periodic, and the quality factor is inversely proportional to the relative amplitude of mass accretion fluctuations, with its largest value Q approximate to 1/(10|delta(M)over dot/(M)over dot|) attained in oscillations at about 1 to 2 kHz frequencies for a2 M-circle dot star.