Real-Time Stellar Evolution of Sakurai's Object
After a hot white dwarf ceases its nuclear burning, its helium may briefly and explosively reignite. This causes the star to evolve back into a cool giant, whereupon it experiences renewed mass ejection before reheating. A reignition event of this kind was observed in 1996 in V4334 Sgr (Sakurai'...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2005-04, Vol.308 (5719), p.231-233 |
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| creator | Hajduk, Marcin Zijlstra, Albert A Herwig, Falk van Hoof, Peter A. M Kerber, Florian Kimeswenger, Stefan Pollacco, Don L Evans, Aneurin Lopéz, José A Bryce, Myfanwy Eyres, Stewart P. S Matsuura, Mikako |
| description | After a hot white dwarf ceases its nuclear burning, its helium may briefly and explosively reignite. This causes the star to evolve back into a cool giant, whereupon it experiences renewed mass ejection before reheating. A reignition event of this kind was observed in 1996 in V4334 Sgr (Sakurai's object). Its temperature decrease was 100 times the predicted rate. To understand its unexpectedly fast evolution, we have developed a model in which convective mixing is strongly suppressed under the influence of flash burning. The model predicts equally rapid reheating of the star. Radio emission from freshly ionized matter now shows that this reheating has begun. Such events may be an important source of carbon and carbonaceous dust in the Galaxy. |
| doi_str_mv | 10.1126/science.1108953 |
| format | Article |
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Its temperature decrease was 100 times the predicted rate. To understand its unexpectedly fast evolution, we have developed a model in which convective mixing is strongly suppressed under the influence of flash burning. The model predicts equally rapid reheating of the star. Radio emission from freshly ionized matter now shows that this reheating has begun. Such events may be an important source of carbon and carbonaceous dust in the Galaxy.</abstract><cop>Washington, DC</cop><pub>American Association for the Advancement of Science</pub><pmid>15821085</pmid><doi>10.1126/science.1108953</doi><tpages>3</tpages></addata></record> |
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| identifier | ISSN: 0036-8075 |
| ispartof | Science (American Association for the Advancement of Science), 2005-04, Vol.308 (5719), p.231-233 |
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| source | American Association for the Advancement of Science; Jstor Complete Legacy |
| subjects | Analysis Astronomical objects Astronomy Carbon stars Climate Computer Simulation Earth, ocean, space Exact sciences and technology Faint blue stars (including blue stragglers), white dwarfs, degenerate stars, nuclei of planetary nebulae Giant stars Helium Infrared spectroscopy Modeling Nebulae Normal stars (by class): general or individual Observational astronomy Observations Physics Planetary nebulae Radio Solar mass Star & galaxy formation Stars Stellar characteristics and properties Stellar evolution Stellar structure, interiors, evolution, nucleosynthesis, ages |
| title | Real-Time Stellar Evolution of Sakurai's Object |
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