2013A&A...560A...1G


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.16CEST17:10:57

2013A&A...560A...1G - Astronomy and Astrophysics, volume 560A, 1-1 (2013/12-1)

Time delay between the optical and X-ray outbursts in the high-mass X-ray transient A0 535+26/HDE 245770.

GIOVANNELLI F., BISNOVATYI-KOGAN G.S. and KLEPNEV A.S.

Abstract (from CDS):

The optical behavior of the Be star in the high-mass X-ray transient A0535+26/HDE245770 shows that at periastron the luminosity is typically enhanced by 0.02 to a few tenths mag, and the X-ray outburst occurs eight days after the periastron. We constructed a quantitative model for this event based on a nonstationary accretion disk behavior, connected with a high ellipticity of the orbital motion. We explain the observed time delay between the peaks of the optical and X-ray outbursts in this system by the time of radial motion of the matter in the accretion disk, after an increase of the mass flux in the vicinity of a periastral point in the binary. This time is determined by the turbulent viscosity with a parameter of α=0.1-0.3. The increase of the mass flux is a sort of flush that reaches the external part of the accretion disk around the neutron star, which enhances the optical luminosity. The subsequent X-ray flare occurs when the matter reaches the hot central parts of the accretion disk and the neutron star's surface.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: neutron - X-rays: binaries - X-rays: individuals: A0535+26 - stars: individual: V725 Tau - stars: emission-line, Be

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 Mrk 1506 Sy1 04 33 11.0958197353 +05 21 15.617543663   15.72 15.05 10.08   ~ 1798 2
2 HD 245770 HXB 05 38 54.5749436467 +26 18 56.839215267 9.30 9.84 9.39 8.77 8.30 O9/B0III/Ve 853 0
3 NGC 3516 Sy1 11 06 47.4596406816 +72 34 07.189563769   13.12 12.40     ~ 1383 0
4 Mrk 509 Sy1 20 44 09.7504131334 -10 43 24.724854084   13.35 13.12 10.7   ~ 1089 0
5 NGC 7469 Sy1 23 03 15.674 +08 52 25.28 12.60 13.00 12.34     ~ 1834 3

    Equat.    Gal    SGal    Ecl

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2019.09.16-17:10:57

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