EDP Sciences
Free access
Issue
A&A
Volume 384, Number 1, March II 2002
Page(s) 190 - 194
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20011837


A&A 384, 190-194 (2002)
DOI: 10.1051/0004-6361:20011837

CHANDRA detection of 16 new X-ray sources

A. Küpcü Yoldas and S. Balman

Department of Physics, Middle East Technical University, Inönü Bulvari, 06531 Ankara, Turkey

(Received 6 November 2001 / Accepted 20 December 2001)

Abstract
We have detected 18 sources over 6 $\sigma$ threshold within two regions 8 $\farcm$3 $\times$16 $\farcm$9 and 8 $\farcm$3 $\times$ 33 $\farcm$6 in the vicinity of the point with $\alpha=$ 03 $^{\rm h}$31 $^{\rm m}$02 $\fs$45 (J2000) and $\delta=$ +43 $\degr$47 $\arcmin$58 $\farcs$5 (J2000) using a CHANDRA ACIS (S+I) observation. Two of the sources were detected before with ROSAT HRI and one source could be closely identified with a star in the optical catalog, USNO A-2. We have also studied source spectra applying four spectral models to the data. Most of the sources can be classified as Cataclysmic Variable, Low Mass X-ray Binary or single star candidates due to their spectral characteristics and luminosities. We also searched for the extragalactic origin for these 18 sources. The source count rates vary between 5.8 $\times 10^{-4}$-4.7 $\times 10^{-3}$ counts/s. Due to low count rates temporal characteristics of the sources can not be studied effectively.


Key words: X-rays: stars -- X-rays: galaxies -- X-rays: binaries -- stars: cataclysmic variables, neutron

Offprint request: A. Küpcü Yoldas, aybuke@astroa.physics.metu.edu.tr

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