Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-04-09
Astrophys.J. 589 (2003) L41-L44
Astronomy and Astrophysics
Astrophysics
12 pages, 4 figures, accepted by ApJL
Scientific paper
10.1086/375729
We present a detailed study of the Halpha and He I spectral features of COM J1740-5340 (the companion to PSR J1740-5340 in the Galactic Globular Cluster NGC 6397), exploiting a series of high resolution spectra obtained at different orbital phases. The Halpha absorption line shows a complex two-component structure, revealing that optically thin hydrogen gas resides outside the Roche lobe of COM J1740-5340. The line morphology precludes the existence of any residual disk around the millisecond pulsar, and suggests the presence of a stream of material going from the companion toward the neutron star. This material never reaches the neutron star surface, being driven back by the pulsar radiation far beyond COM J1740-5340. By analyzing the He I absorption lines as a function of orbital phase, we infer the presence of an overheated longitudinal strip (about 150 times narrower than it is long) on the COM J1740-5340 surface facing the radio pulsar.
Bragaglia Angela
Camilo Fernando
D'Amico Nichi
Ferraro Francesco R.
Gratton Raffaele
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