2010A&A...516A..58G


Query : 2010A&A...516A..58G

2010A&A...516A..58G - Astronomy and Astrophysics, volume 516, A58-58 (2010/6-2)

Doppler tomography of the black hole binary A0620-00 and the origin of chromospheric emission. in quiescent X-ray binaries.

GONZALEZ HERNANDEZ J.I. and CASARES J.

Abstract (from CDS):

Doppler tomography of emission line profiles in low-mass X-ray binaries allows us to disentangle the different emission sites and study the structure and variability of accretion disks. We present UVES high-resolution spectroscopic observations of the black hole binary A0620-00 at quiescence. These spectroscopic data constrain the orbital parameters Porb=0.32301405(1) d and K2=437.1±2.0km/s. These values, together with the mass ratio q=M2/M1=0.062±0.010, imply a minimum mass for the compact object of M1sin3i =3.15±0.10M, consistent with previous works. The Hα emission from the accretion disk is much weaker than in previous studies, possibly because of a decrease in disk activity. Doppler imaging of the Hα line shows for the first time a narrow component coming from the secondary star, with an observed equivalent width of 1.4±0.3Å, perhaps associated to chromospheric activity. Subtracting a K-type template star and correcting for the veiling of the accretion disk yields an equivalent width of 2.8±0.3Å. A bright hot spot is also detected at the position where the gas stream trajectory intercepts the accretion disk. The Hα flux associated to the secondary star is too large to be powered by X-ray irradiation. It is comparable to those observed in RS CVn binaries with similar orbital periods and is probably triggered by the rapid stellar rotation.

Abstract Copyright:

Journal keyword(s): black hole physics - accretion, accretion disks - binaries: close - stars: individual: V616 Mon - X-rays: binaries - stars: activity

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 1A 0620-00 HXB 06 22 44.5423857312 -00 20 44.290460544 10.60 11.40 11.2     K3V-K7V 1082 0
2 V* KV UMa HXB 11 18 10.7930420496 +48 02 12.314730120     12.25     K5V-M1V 783 0
3 V* GU Mus HXB 11 26 26.5961559600 -68 40 32.877752952           K3V-K7V 694 1
4 V* V822 Cen LXB 14 58 21.9347842080 -31 40 07.515432768 11.95 12.85 12.8     K3-K7V 534 0
5 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1819 1
6 V* V2107 Oph HXB 17 08 14.520 -25 05 30.15   16.50 15.9     K3V-K7V 217 1
7 * eps Ind PM* 22 03 21.6536261624 -56 47 09.522795714   5.75 4.69     K5V 522 0

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2023.02.04-19:21:49

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