Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-06-26
Astronomy and Astrophysics
Astrophysics
Proceedings of Puerto Vallarta 07, "New Quests in Stellar Astrophysics. II. The Ultraviolet Properties of Evolved Stellar Popu
Scientific paper
The discovery of an excess of light in the far-ultraviolet (UV) spectrum in elliptical galaxies was a major surprise in 1969. While it is now clear that this UV excess is caused by an old population of hot helium-burning stars without large hydrogen-rich envelopes rather than young stars, their origin has remained a mystery. Here we show that these stars most likely lost their envelopes because of binary interactions, similar to the hot subdwarf population in our own Galaxy. This has major implications for understanding the evolution of the UV excess and of elliptical galaxies in general. In particular, it implies that the UV excess is not a sign of age, as had been postulated previously, and predicts that it should not be strongly dependent on the metallicity of the population.
Han Zhanwen
Lynas-Gray Anthony E.
Podsiadlowski Philipp
No associations
LandOfFree
Binary Stars as the Source of the Far-UV Excess in Elliptical Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Binary Stars as the Source of the Far-UV Excess in Elliptical Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Binary Stars as the Source of the Far-UV Excess in Elliptical Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-505589