On the presence and absence of disks around O-type stars
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چکیده
منابع مشابه
On the presence and absence of disks around O-type stars
Context. As the favoured progenitors of long-duration gamma-ray bursts, massive stars may represent our best signposts of individual objects in the early Universe, but special conditions seem required to make these bursters. These are thought to originate from the progenitor’s rapid rotation and associated asymmetry. Aims. To obtain empirical constraints on the interplay between stellar rotatio...
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Disks are a natural outcome of the star formation process in which they play a crucial role. Luminous, massive stars of spectral type earlier than B4 are likely to be those that benefit most from the existence of accretion disks, which may significantly reduce the effect of radiation pressure on the accreting material. The scope of the present contribution is to review the current knowledge abo...
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چکیده ندارد.
Hyperaccretion Disks around Neutron Stars
It is usually proposed that hyperaccretion disks surrounding stellar-mass black holes at an accretion rate of a fraction of one solar mass per second, which are produced during the mergers of double compact stars or the collapses of massive stars, are central engines of gamma-ray bursts (GRBs). In some origin/afterglow models, however, newborn compact objects are invoked to be neutron stars rat...
متن کاملOn the Evidence of Disks around Blue Straggler Stars
Recent observations of blue stragglers by O. De Marco et al. have revealed continuum deficits on the blue side of the Balmer discontinuity, leading these authors to infer the presence of disks around the stars. This intriguing possibility may throw light on aspects of the mechanisms responsible for at least some of these objects; current theories of blue straggler formation invoke stellar colli...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2009
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/200912610