Variability and Spectra of Two Neutron Stars in 47 Tucanae

Details Variability and Spectra of Two Neutron Stars in 47 Tucanae Variability and Spectra of Two Neutron Stars in 47 Tucanae

2001-12-06

arxiv.org/abs/astro-ph/0112127v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, to appear in "Neutron Stars in Supernova Remnants" (ASP Conference Proceedings), eds P. O. Slane and B. M.

Scientific paper

We report spectral and variability analysis of two quiescent low mass x-ray binaries (previously identified with ROSAT HRI as X5 and X7) in the globular cluster 47 Tuc, from a Chandra ACIS-I observation. X5 demonstrates sharp eclipses with an 8.666+-0.008 hr period, as well as dips showing an increased N_H column. Their thermal spectra are well-modelled by unmagnetized hydrogen atmospheres of hot neutron stars, most likely heated by transient accretion, with little to no hard power law component.

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