Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.6206a&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #62.06; Bulletin of the American Astronomical Society, Vol. 26, p.1416
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Using the ASCA Observatory we have discovered a strong 1kev Neon emission line complex in X-ray spectra of the 7s X-ray pulsar 4U1626-67. The Ly--alpha , Ly--beta , and Helium-like-alpha lines are detected at 1.05, 1.10 and 0.95 keV, respectively as well as a L-alpha Ne recombination edge at 1.20 keV. This is the first time a recombination line has been detected from a cosmic X-ray source. The strength of the neon emission compared to the expected iron L complex implies a factor of ~ 10 Neon overabundance relative to iron. 4U1626-67 is a low mass X-ray binary, LMXRB, system with an orbital period of 2485s, and is unusual in that it is one of the few LMXRB to contain an X-ray pulsar. Neon is a by-product of Helium burning and its overabundance in this system indicates that the companion star is burning, or has in the past burnt Helium. This supports the evolutionary scenario for 4U1626-67 where the donor star is a helium-burning star.
Angelini Leonardo
Becker Christoph
Kallman Tim R.
Nagase Fumiaki
Takeshima Toshi
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