Dust-enshrouded star near supermassive black hole: predictions for high-eccentricity passages near low-luminosity galactic nuclei

0427787 - ASÚ 2015 RIV FR eng J - Journal Article
Zajaček, Michal - Karas, Vladimír - Eckart, A.
Dust-enshrouded star near supermassive black hole: predictions for high-eccentricity passages near low-luminosity galactic nuclei.
Astronomy & Astrophysics. Roč. 565, May (2014), A17/1-A17/15. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA ČR(CZ) GC13-00070J
Grant - others:UK(CZ) SVV-26089
Institutional support: RVO:67985815
Keywords : galactic centre * black holes * accretion disks
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
Impact factor: 4.378, year: 2014

We model the pericentre passage of a dust-enshrouded star during which the dusty envelope becomes stretched by tidal forces and is affected by the interaction with the surrounding medium. In particular, we explore under which conditions these encounters can lead to periods of enhanced accretion activity. We determine the fraction of the total mass of the dust component that is diverted from the original path during the passages through the pericentre at cca103 Schwarzschild radii and find that the main part of the dust (more than 90% of its mass) is significantly affected upon the first crossing. The fraction of mass captured at the second passage generally decreases to very low values.
Permanent Link: http://hdl.handle.net/11104/0234420