The origin of QPO sources

Details The origin of QPO sources The origin of QPO sources

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...172l..23i&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 172, no. 1-2, Jan. 1987, p. L23-L25.

Astronomy and Astrophysics

Astrophysics

3

Neutron Stars, Periodic Variations, Stellar Mass Accretion, Stellar Oscillations, White Dwarf Stars, X Ray Binaries, Gravitational Collapse, Stellar Evolution, Stellar Models, X Ray Sources

Scientific paper

The problem of the origin of quasi-periodic X-ray oscillation (QPO) sources is examined, noting that direct collapse of a white dwarf to a neutron star is difficult to explain since mass-accreting white dwarfs approaching Chandrasekhar's limit are normally assumed to be progenitors of Type I supernovae and not in general to leave a neutron star remnant. QPO sources can be interpreted as rotating, mass-accreting neutron stars possessing a magnetic field of the order of 10 to the 9 gauss. This would suggest that the neutron star was recently formed. Such objects, however, are quite old - at least 5 billion years old. Thus it is very likely that the neutron star was produced from the collapse, with little or no explosion, of an old white dwarf.

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