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Astron. Astrophys. 318, L43-L46 (1997)

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Letter to the Editor

On the X-ray position and deep optical imaging of the neutron star candidate RXJ1856.5-3754 *

R. Neuhäuser 1, H.-C. Thomas 2, R. Danner 1, S. Peschke 3 and F.M. Walter 4

1 Max-Planck-Institut für extraterrestrische Physik, D-85740 Garching, Germany
2 Max-Planck-Institut für Astrophysik, D-85740 Garching, Germany
3 Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany
4 Dept. of Earth and Space Science, State University of New York, Stony Brook 11793-2100, USA

Received 31 October 1996 / Accepted 7 January 1997


We present X-ray and optical studies of the ROSAT source RXJ1856.5-3754, a neutron star candidate. With recent optical observations of a potential optical counterpart to another X-ray source in the field and correcting the X-ray positions for two effects not taken into account before, we determine the ROSAT X-ray source position and its error, both different from previous work. Also, we present deep optical imaging in B and V obtained with the ESO - MPI 2.2 m telescope on La Silla and in B and R obtained with the Keck telescope.

Key words: Neutron star: individual: RXJ1856.5-3754

* partly based on observations collected at the European Southern Observatory 1.5m and 2.2m telescopes on La Silla during programs 57.E-0646, 57.MPI-3, and 57.MPI-5

Send offprint requests to: Ralph Neuhäuser, Internet: rne@hpth03.mpe-garching.mpg.de

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© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998