منابع مشابه
Superbursts at near-Eddington mass accretion rates
Models for superbursts from neutron stars involving carbon shell flashes predict that the mass accretion rate should be anywhere in excess of one tenth of the Eddington limit. Yet, superbursts have so far only been detected in systems for which the accretion rate is limited between 0.1 and 0.25 times that limit. The question arises whether this is a selection effect or an intrinsic property. Th...
متن کاملStrange stars and superbursts at near-Eddington mass accretion rates
Superbursts (SBs) were observed in systems for which accretion rate were derived to be between 0.1 to 0.25 times the Eddington limit. Recent careful assessment of four good SB candidates for GX 17+2 reveals that SB is possible even at near Eddington mass accretion rates. The scenario for SB in strange stars is that a micron-thick layer of diquarks, at the star surface, get broken due to repeate...
متن کاملProtostellar mass accretion rates from gravoturbulent fragmentation
We analyse protostellar mass accretion rates Ṁ from numerical models of star formation based on gravoturbulent fragmentation, considering a large number of different environments. To within one order of magnitude, Ṁ ≈ MJ/τff with MJ being the mean thermal Jeans mass and τff the corresponding free-fall time. However, mass accretion rates are highly timevariant, with a sharp peak shortly after th...
متن کاملMass loss at the lowest stellar masses ⋆
We report the discovery of a jet in a [SII] image of Par-Lup3-4, a remarkable M5-type pre-main sequence object in the Lupus 3 star-forming cloud. The spectrum of this star is dominated by the emission lines commonly interpreted as tracers of accretion and outflows. Par-Lup3-4 is therefore at the very low-mass end of the exciting sources of jets. High resolution spectroscopy shows that the [SII]...
متن کاملTracing Quasar Accretion Rates at Higher Redshifts
In this work we connect some measurable properties of the CIVλ1549 emission line with the quasar accretion rates (Eddington ratios). A tight correlation is found for a sample of more than a hundred nearby objects, suggesting a possible method for a relatively accurate estimate of the Eddington ratio of high-redshift quasars, at least for the radio-quiet ones. This paper further confirms the exi...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2010
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s174392131001567x