Oscillations of the Eddington capture sphere

J 2012

Oscillations of the Eddington capture sphere

ABRAMOWICZ, Marek a M. WIELGUS

Základní údaje

Originální název

Oscillations of the Eddington capture sphere

Autoři

ABRAMOWICZ, Marek a M. WIELGUS

Vydání

Astronomy & Astrophysics, FR - Francouzská republika, 2012, 0004-6361

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Organizační jednotka

Filozoficko-přírodovědecká fakulta v Opavě

DOI

http://dx.doi.org/10.1051/0004-6361/201220228

UT WoS

000309254900123

Klíčová slova anglicky

Accretion; Accretion disks; Gravitation; Relativistic processes; Stars: neutron; X-rays: binaries

Štítky

FÚ

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 15. 4. 2021 10:01, Mgr. Pavlína Jalůvková

Anotace

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 a M. WIELGUS. Oscillations of the Eddington capture sphere. Astronomy & Astrophysics. FR - Francouzská republika, 2012, roč. 545, A123, 3 s. ISSN 0004-6361. Dostupné z: 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 a M. WIELGUS. Oscillations of the Eddington capture sphere. \textit{Astronomy \&{} Astrophysics}. FR - Francouzská republika, 2012, roč.~545, A123, 3 s. ISSN~0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201220228.

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