* Astronomy

Title: Spectroscopic binaries among Hipparcos M giants I. Data, orbits, and intrinsic variations Authors: B. Famaey, D. Pourbaix, A. Frankowski, S. Van Eck, M. Mayor, S. Udry, A. Jorissen This paper is a follow-up of the vast effort to collect radial velocity data for stars belonging to the Hippar...

XMM-Newton has discovered an exploding star in the Milky Way. Usually that would be important in itself, but this time there is a special twist. Calculations show that the explosion must have been clearly visible to the unaided eye but was missed by the legions of star watchers around the planet. On 9...

Title: Multiple ring nebulae around blue supergiants Authors: S. M. Chita, N. Langer, A. J. van Marle, G. Garcia-Segura, A. Heger In the course of the life of a massive star, wind-wind interaction can give rise to the formation of circumstellar nebulae which are both predicted and observed in the na...

Sher 25 is an old blue supergiant star located approximately 20,000 ly from the sun. Its Apparent magnitude is 12.2 and it is a B spectral type. It is part of the constellation Carina. This star as commonly thought to be nearing the point of exploding as a supernova and is located in H II region NGC 3603. [...

How heavy can a star be? This conundrum has haunted astronomers for decades. Theory indicates that there should be an upper stellar mass limit somewhere between 120 and 300 solar masses. Even though heavy stars are very bright, measurements of their masses can be complicated. The majority of the he...

The Spitzer Space Telescope has identified two huge "hypergiant" stars circled by monstrous disks of what might be planet-forming dust. The findings surprised astronomers because stars as big as these were thought to be inhospitable to planets. "These extremely massive stars a...

Giant red dying stars may warm previously frozen worlds around them to the point where liquid water temperature exists long enough for life to form, according to a new analysis of the evolution of habitable zones around stars. ...

Title: The nature of B supergiants: clues from a steep drop in rotation rates at 22000 K. The possibility of Bi-stability braking Authors: Jorick S. Vink, I. Brott, G. Graefener, N. Langer, A. de Koter, D.J. Lennon The location of B supergiants in the Hertzsprung-Russell diagram (HRD) represents a...

	Forum	Replies	Views	Last Post
Giant M giant binaries (Preview)	Stars/galaxy News	0	1388	Jan 9 13:45 2009 by Blobrana
Title: Spectroscopic binaries among Hipparcos M giants I. Data, orbits, and intrinsic variations Authors: B. Famaey, D. Pourbaix, A. Frankowski, S. Van Eck, M. Mayor, S. Udry, A. Jorissen This paper is a follow-up of the vast effort to collect radial velocity data for stars belonging to the Hippar...
Nova Giant V598 Puppis (Preview)	Stars/galaxy News	1	2327	Jul 18 16:06 2008 by Blobrana
XMM-Newton has discovered an exploding star in the Milky Way. Usually that would be important in itself, but this time there is a special twist. Calculations show that the explosion must have been clearly visible to the unaided eye but was missed by the legions of star watchers around the planet. On 9...
Giant Blue supergiants (Preview)	Stars/galaxy News	1	1450	Dec 20 17:30 2011 by Blobrana
Title: Multiple ring nebulae around blue supergiants Authors: S. M. Chita, N. Langer, A. J. van Marle, G. Garcia-Segura, A. Heger In the course of the life of a massive star, wind-wind interaction can give rise to the formation of circumstellar nebulae which are both predicted and observed in the na...
Giant NGC3603 B supergiant Sher 25 (Preview)	Stars/galaxy News	2	3283	Apr 7 19:38 2013 by Blobrana
Sher 25 is an old blue supergiant star located approximately 20,000 ly from the sun. Its Apparent magnitude is 12.2 and it is a B spectral type. It is part of the constellation Carina. This star as commonly thought to be nearing the point of exploding as a supernova and is located in H II region NGC 3603. [...
Giant Pismis 24-1 (Preview)	Stars/galaxy News	7	7374	Feb 20 19:50 2013 by Blobrana
How heavy can a star be? This conundrum has haunted astronomers for decades. Theory indicates that there should be an upper stellar mass limit somewhere between 120 and 300 solar masses. Even though heavy stars are very bright, measurements of their masses can be complicated. The majority of the he...
Giant Hypergiant star R66 (Preview)	Stars/galaxy News	1	2590	Feb 8 20:53 2006 by Blobrana
The Spitzer Space Telescope has identified two huge "hypergiant" stars circled by monstrous disks of what might be planet-forming dust. The findings surprised astronomers because stars as big as these were thought to be inhospitable to planets. "These extremely massive stars a...
Giant Giant red dying stars (Preview)	Stars/galaxy News	1	3133	May 30 15:58 2013 by Blobrana
Giant red dying stars may warm previously frozen worlds around them to the point where liquid water temperature exists long enough for life to form, according to a new analysis of the evolution of habitable zones around stars. ...
Giant B supergiants (Preview)	Stars/galaxy News	0	1376	Mar 8 12:27 2010 by Blobrana
Title: The nature of B supergiants: clues from a steep drop in rotation rates at 22000 K. The possibility of Bi-stability braking Authors: Jorick S. Vink, I. Brott, G. Graefener, N. Langer, A. de Koter, D.J. Lennon The location of B supergiants in the Hertzsprung-Russell diagram (HRD) represents a...