Ages of white dwarf-red subdwarf systems
DOI:
https://doi.org/10.5585/exacta.v4i2.755Keywords:
words, Aging estimates. Binaries. Subdwarfs. White dwarfs.Abstract
We provide the fi rst age estimates for two recently discovered white dwarf-red subdwarf systems, LHS 193AB and LHS 300AB. These systems provide a new opportunity for linking the reliable age estimates for the white dwarfs to the (measurable) metallicities of the red subdwarfs. We have obtained precise photometry in the VJRKCIKCJH bands and spectroscopy covering from 6,000°A to 9,000°A (our spectral coverage)for the two new systems, as well as for a comparison white dwarfmain sequence red dwarf system, GJ 283 AB. Using model grids, we estimate the cooling age as well as temperature, surface gravity, mass, progenitor mass and total lifetimes of the white dwarfs. The results indicate that the two new systems are probably ancient thick disk objects with ages of at least 6-9 gigayears (Gyr).Downloads
Download data is not yet available.
Downloads
Published
2008-03-24
How to Cite
Monteiro, H., Jao, W. C., Henry, T., Subasavage, J., & Beaulieu, T. (2008). Ages of white dwarf-red subdwarf systems. Exacta, 4(2), 273–280. https://doi.org/10.5585/exacta.v4i2.755
Issue
Section
Papers
License
Autores que tiverem artigos aceitos para publicação na Revista Exacta concordam com os seguintes termos:
- A Cessão dos Direitos Autorais da publicação do artigo à Revista Exacta;
- Os autores que tiverem seus trabalhos aceitos e publicados na Revista Exacta estão sujeitos a Política de Direitos Autorais CC BY NC SA https://creativecommons.org/licenses/by-nc-sa/4.0/;
- A publicação do artigo pela Revista Exacta, em caráter de exclusividade e em meio eletrônico;
- A indexação do artigo em bases de dados nacionais e internacionais, diretórios, bibliotecas digitais e bases bibliométricas em que a Revista estiver e vir a estar indexada.
