Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...449l..41a&link_type=abstract
Astrophysical Journal Letters v.449, p.L41
Astronomy and Astrophysics
Astronomy
62
Stars: Binaries: Close, Stars: Individual Alphanumeric: 4U 1626-67, X-Rays: Stars
Scientific paper
Using the ASCA Observatory we have discovered a strong emission-line complex centered on 1 keV in the X-ray spectrum of the 7 s pulsar 4U 1626-67. The strongest line is identified with hydrogen-like Ne Ly alpha at 1.008 keV. The strength of the neon emission compared to the expected iron L complex implies a large neon overabundance relative to iron. 4U 1626-67 is a low-mass X-ray binary (LMXRB) system with an orbital period of 2485 s, and is unusual because it is one of a few LMXRB to contain an X-ray pulsar. A hydrogen burning companion star was suggested to explain the X-ray and optical characteristics. Neon is a by-product of helium burning and its overabundance in this system may indicate instead that the companion star is burning (or has burned) helium.
Angelini Leonardo
Becker Christoph
Kallman Tim R.
Nagase Fumiaki
Paerels Frederic
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