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19 April 2024 |
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The origin of the tilted disk in the low mass X-ray binary GR Mus (XB 1254-690) | | R. Cornelisse
; M.M. Kotze
; J. Casares
; P.A. Charles
; P.J. Hakala
; | | Date: |
19 Sep 2013 | | Abstract: | We present photometric and spectroscopic observations of the low mass X-ray
binary GR Mus (XB 1254-690), and find strong evidence for the presence of a
negative superhump with a period that is 2.4+/-0.3% shorter than the orbital.
This provides further support that GR Mus indeed harbours a precessing
accretion disk (with a period of 6.74+/-0.07 day) that has retrograde
precession and is completely tilted out of the orbital plane along its line of
nodes. This tilt causes a large fraction of the gas in the accretion stream to
either over- or underflow the accretion disk instead of hitting the disk rim,
and could be a feature of all low mass X-ray binaries with characteristics
similar to GR Mus (i.e. the so-called atoll sources). Furthermore, we also find
marginal evidence for the presence of a positive superhump, suggesting that the
accretion disk in GR Mus is eccentric due to tidal resonances. If true, than
the relationship between the positive superhump period excess and the mass
ratio (q) provides a constraint of q=M_donor/M_NS=0.33-0.36. Together with the
radial velocity semi-amplitude measurements of the compact object, and previous
modeling of the inclination we obtain a mass for the neutron star of
1.2<M_NS/M_sun<1.8 (95% confidence). | | Source: | arXiv, 1309.4972 | | Services: | Forum | Review | PDF | Favorites | |
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