Oscillations of the Eddington capture sphere

J 2012

Oscillations of the Eddington capture sphere

ABRAMOWICZ, Marek and M. WIELGUS

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

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

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

Abstract

V originále

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.

Citovat

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.

@article{43584,
   author = {Abramowicz, Marek and Wielgus, M.},
   article_location = {FR - Francouzská republika},
   article_number = {A123},
   doi = {http://dx.doi.org/10.1051/0004-6361/201220228},
   keywords = {Accretion; Accretion disks; Gravitation; Relativistic processes; Stars: neutron; X-rays: binaries},
   language = {eng},
   issn = {0004-6361},
   journal = {Astronomy & Astrophysics},
   title = {Oscillations of the Eddington capture sphere},
   url = {https://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201220228&Itemid=129},
   volume = {545},
   year = {2012}
}

TY  - JOUR
ID  - 43584
AU  - Abramowicz, Marek - Wielgus, M.
PY  - 2012
TI  - Oscillations of the Eddington capture sphere
JF  - Astronomy & Astrophysics
VL  - 545
IS  - A123
SN  - 00046361
KW  - Accretion
KW  - Accretion disks
KW  - Gravitation
KW  - Relativistic processes
KW  - Stars: neutron
KW  - X-rays: binaries
UR  - https://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201220228&Itemid=129
N2  - 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.
ER  -

ABRAMOWICZ, Marek and M. WIELGUS. Oscillations of the Eddington capture sphere. \textit{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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