SIMBAD references

1999A&A...341L..51S - Astronomy and Astrophysics, volume 341, L51-54 (1999/1-2)

The isolated neutron star candidate RBS 1223 (1RXS J130848.6+212708).

SCHWOPE A.D., HASINGER G., SCHWARZ R., HABERL F. and SCHMIDT M.

Abstract (from CDS):

In the ROSAT Bright Survey (RBS) we have almost completely optically identified the brightest ∼2000 high-galactic latitude sources from the ROSAT All-Sky Survey Bright Source Catalogue (1RXS). A small number of sources has empty X-ray error circles on optical images. ROSAT HRI follow-up observations of RBS 1223 (=1RXS J130848.6+212708), a soft object with extreme X-ray to optical flux ratio, have confirmed a relatively bright X-ray source, whose position could be determined to an accuracy of 1.6 arcsec (90%) due to the presence of a nearby, X-ray detected bright star. Deep Keck R- and B-band images of the field were taken, but the refined X-ray error circle remains empty to a limiting magnitude B∼26m. With an X-ray to optical flux ratio of log(fX/fopt)>4.1 this object is almost certainly an isolated neutron star, similar to the two so far best-known examples RX J1856.4-3754 and RX J0720.4-3125. We discuss limits on the number of similar objects in the RBS catalogue.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: neutron - X-rays: stars - stars: individual: RBS 1223

Simbad objects: 5

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