Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-05-31
Astronomy and Astrophysics
Astrophysics
12 pages and 2 figures, to be published in the Astrophysical Journal Letters
Scientific paper
10.1086/323160
We present a comprehensive classification of all observed QPOs within the framework of the transition layer model using a large set of Rossi X-ray Timing Explorer (RXTE) data for Sco X-1. The model assumes an optically thin material along the observer's line of sight in the horizontal branch and an increasingly optically thick material while in the other two branches that is consistent with X-ray and radio observations and the disk transition layer model of QPOs. We identify the ~ 6 Hz frequencies in the normal branch as acoustic oscillations of a spherical shell around the neutron star (NS) that is formed after radiation pressure near the Eddington accretion rate destroys the disk. The size of the shell is on the order of one NS radii from the NS. We also estimate the upper limit of Sco X-1's magnetic field to be 0.7 x 10^6 G at about one NS radii above the NS surface while in the horizontal X-ray branch.
Bradshaw Charles F.
Fomalont Edward B.
Geldzahler Barry J.
Titarchuk Lev
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