| dc.creator | Serenelli, Aldo Marcelo | |
| dc.creator | Althaus, Leandro Gabriel | |
| dc.creator | Benvenuto, Omar Gustavo | |
| dc.date | 2001 | |
| dc.date | 2010-08-25T03:00:00Z | |
| dc.identifier | http://sedici.unlp.edu.ar/handle/10915/2055 | |
| dc.identifier | http://fcaglp.fcaglp.unlp.edu.ar/evolgroup/Papers/ARTICLES/2001/MNRAS_325_607_2001.pdf | |
| dc.identifier | http://mnras.oxfordjournals.org/content/325/2/607 | |
| dc.identifier | issn:1365-2966 | |
| dc.description | The purpose of this work is to explore the evolution of helium-core white dwarf stars in a self-consistent way with the predictions of detailed non-grey model atmospheres and element diffusion. To this end, we consider helium-core white dwarf models with stellar masses of 0.406, 0.360, 0.327, 0.292, 0.242, 0.196 and 0.169 Msolar and follow their evolution from the end of mass-loss episodes, during their pre-white dwarf evolution, down to very low surface luminosities. We find that when the effective temperature decreases below 4000K, the emergent spectrum of these stars becomes bluer within time-scales of astrophysical interest. In particular, we analyse the evolution of our models in the colour-colour and in the colour-magnitude diagrams and find that helium-core white dwarfs with masses ranging from ~0.18 to 0.3Msolar can reach the turn-off in their colours and become blue again within cooling times much less than 15Gyr and then remain brighter than MV~16.5. In view of these results, many low-mass helium white dwarfs could have had enough time to evolve to the domain of collision-induced absorption from molecular hydrogen, showing blue colours. | |
| dc.description | Facultad de Ciencias Astronómicas y Geofísicas | |
| dc.format | application/pdf | |
| dc.format | 607-616 | |
| dc.language | en | |
| dc.rights | http://creativecommons.org/licenses/by-nc-nd/4.0/ | |
| dc.rights | Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) | |
| dc.subject | Ciencias Astronómicas | |
| dc.subject | stars: atmospheres | |
| dc.subject | stars: evolution | |
| dc.subject | stars: fundamental parameters | |
| dc.subject | stars: interiors | |
| dc.subject | white dwarfs | |
| dc.title | The ages and colours of cool helium-core white dwarf stars | |
| dc.type | Articulo | |
| dc.type | Articulo | |
