Evidence of a supernova origin for the black hole in the system GRO J1655-40

Article Abstract:

Stars greater than ten solar masses in size are thought to end their lives as a black hole remnant, either in a direct gravitational collapse or a supernova. A new study of Nova Scorpii 1994, also known as GRO J1655-40, shows that the star orbiting its black hole contains an overabundance of oxygen, magnesium, sulphur and silicon. This could be the first direct link between a supernova explosion and the birth of a black hole. The extra elements could have been captured from supernova ejecta by the companion star.

Supernovae, Supernovas

---

High lithium abundance in the secondary of the black-hole binary system V404 Cygni

Article Abstract:

High levels of lithium have been detected in the spectrum of V404 Cygni, which may be a binary system consisting of a secondary star orbiting a black hole primary. Black hole binary systems may therefore be at least one source for cosmic lithium. Production of lithium by binary systems may result either from the supernova explosion that formed the black hole or from spallation that occurs as material from the secondary is accreted within the black hole.

Research, Lithium, Lithium (Metal), Cosmic abundances, Stars, Double, Binary stars

---

Discovery of a brown dwarf in the Pleiades star cluster

Article Abstract:

A brown dwarf, Which is a celestial body that is like a star only cooler, was detected near the center of the Pleiades star cluster. On the basis of its low luminescence, the mass of the brown dwarf was estimated to be less than 0.08 solar masses. It was concluded on the basis of the single finding of a brown dwarf that these bodiesprobably make up less than 1% of the Galactic disk mass.

Discovery and exploration, Stars, Brown dwarfs, Star clusters

Similar abstracts:

• Abstracts: Effect of a spring hunt on nutrient storage by greater snow geese in southern Quebec. Carrying capacity of wetland habitats used by breeding Greater Snow Geese
• Abstracts: Effects of economic prosperity on numbers of threatened species. Weitzman's approach and conservation of breed diversity: an application to African cattle breeds
• Abstracts: Memory: maintenance is presynaptic. Presynaptic mechanism for the long-term potentiation in the hippocampus. A synaptic model of memory: long-term potentiation in the hippocampus
• Abstracts: NSF gets a pat on the back in report suggesting stronger industrial ties. First meeting of commission gives Massey a boost in plotting viable future for NSF
• Abstracts: The view from the North. Technology dodging the cuts

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.