2000A&A...357L..25P


Query : 2000A&A...357L..25P

2000A&A...357L..25P - Astronomy and Astrophysics, volume 357, L25-28 (2000/5-1)

Chandra measurement of the geometrical distance to Cyg X-3 using its X-ray scattering halo.

PREDEHL P., BURWITZ V., PAERELS F. and TRUEMPER J.

Abstract (from CDS):

Using Chandra-HETGS data of Cyg X-3 we succeeded for the first time in applying a method, developed 27 years ago, to directly determine the geometric distance to X-ray sources. The method implies the existence of a halo of radiation scattered on interstellar dust. Any intensity variations of the source itself appear delayed and smeared out in the halo. By analysing and correlating the X-ray lightcurves at different radial distances from the source, we could determine the distance to Cyg X-3 to be approximately 9 kpc. Even though the statistics in this dataset are meager the usefulness and the possibilities of this method are convincingly demonstrated.

Abstract Copyright:

Journal keyword(s): scattering - stars: binaries: eclipsing - ISM: clouds - X-rays: galaxies - X-rays: ISM

Simbad objects: 2

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Number of rows : 2
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* V818 Sco LXB 16 19 55.0692669024 -15 38 25.017666540 11.60 12.40 11.1     Oev 1570 0
2 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1856 2

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2022.05.23-22:36:31

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