2006A&A...445.1089L


Query : 2006A&A...445.1089L

2006A&A...445.1089L - Astronomy and Astrophysics, volume 445, 1089-1092 (2006/1-3)

The broad-band spectrum of Cyg X-2 with INTEGRAL.

LAVAGETTO G., DI SALVO T., FALANGA M., IARIA R., ROBBA N.R., BURDERI L., LEWIN W.H.G., MENDEZ M., STELLA L. and VAN DER KLIS M.

Abstract (from CDS):

We study the broad band (3-100keV) spectrum of Cygnus X-2 with INTEGRAL. We find that the spectrum is well fitted by a Comptonized component with a seed-photons temperature of ∼1keV, an electron temperature of ∼3keV and an optical depth τ∼8. Assuming spherical geometry, the radius of the seed-photons emitting region is ∼17km. The source shows no hard X-ray emission; it was detected only at a 3 σ level above 40keV. We also analyzed public ISGRI data of Cyg X-2 to investigate the presence of a hard X-ray component. We report the possible presence of hard X-ray emission in one data set.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - binaries: close - stars: individual: Cygnus X-2 - stars: neutron

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* BR Cir HXB 15 20 40.85 -57 10 00.1   21.4 21.4     ~ 746 1
2 V* V818 Sco LXB 16 19 55.0692669024 -15 38 25.017666540 11.60 12.40 11.1     Oev 1577 0
3 V* V1101 Sco LXB 17 05 44.4916006152 -36 25 23.049324480   20.10 18.6     ~ 420 0
4 4U 1758-25 LXB 18 01 09.7308060816 -25 04 44.120221284     11.08     ~ 631 1
5 V* NP Ser LXB 18 16 01.389 -14 02 10.62   18.8       K 619 2
6 V* V1341 Cyg LXB 21 44 41.1544345272 +38 19 17.066570988 15.00 15.13 14.68 15.00   A9III 1108 1

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2022.08.11-01:10:36

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