EDP Sciences
Free access
Volume 368, Number 2, March III 2001
Page(s) 569 - 571
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010023

A&A 368, 569-571 (2001)
DOI: 10.1051/0004-6361:20010023

Spectroscopic confirmation of the optical identification of X-ray sources used to determine accurate positions for the anomalous X-ray pulsars 1E 2259+58.6 and 4U 0142+61

M. van den Berg and F. Verbunt

Astronomical Institute, Utrecht University, PO Box 80000, 3508 TA Utrecht, The Netherlands

(Received 7 September 2000 / Accepted 14 December 2000 )

Optical spectra show that two proposed counterparts for X-ray sources detected near 1E 2259+58.6 are late G stars, and a proposed counterpart for a source near 4U 0142+61 is a dMe star. The X-ray luminosities are as expected for such stars. We thus confirm the optical identification of the three X-ray objects, and thereby the correctness of the accurate positions for 1E 2259+58.6 and 4U 0142+61 based on them.

Key words: pulsars: individual: 1E 2259+58.6, 4U 0142+61 -- stars: neutron -- X-rays: stars

Offprint request: M. van den Berg, m.c.vandenberg@astro.uu.nl

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