The potential of the variable DA white dwarf G117-B15A as a tool for Fundamental Physics

White dwarfs are well studied objects. The relative simplicity of their physics allows to obtain very detailed models which can be ultimately compared with their observed properties. Among white dwarfs there is a speciﬁc class of stars, known as ZZ-Ceti objects, which have a hydrogen-rich envelope a...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Córsico, Alejandro Hugo, Benvenuto, Omar Gustavo, Althaus, Leandro Gabriel, Isern, Jordi, García Berro, Enrique
Formato:	Articulo Preprint
Lenguaje:	Inglés
Publicado:	2001
Materias:	Ciencias Astronómicas estrellas elementary particles: astronomical observations; elementary particles: astrophysics; stars: oscillations; stars: white dwarfs astrofísica
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/2066 http://arxiv.org/pdf/astro-ph/0104103v1.pdf http://www.sciencedirect.com/science/article/pii/S1384107601000550
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-2066
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Astronómicas estrellas elementary particles: astronomical observations; elementary particles: astrophysics; stars: oscillations; stars: white dwarfs astrofísica
spellingShingle	Ciencias Astronómicas estrellas elementary particles: astronomical observations; elementary particles: astrophysics; stars: oscillations; stars: white dwarfs astrofísica Córsico, Alejandro Hugo Benvenuto, Omar Gustavo Althaus, Leandro Gabriel Isern, Jordi García Berro, Enrique The potential of the variable DA white dwarf G117-B15A as a tool for Fundamental Physics
topic_facet	Ciencias Astronómicas estrellas elementary particles: astronomical observations; elementary particles: astrophysics; stars: oscillations; stars: white dwarfs astrofísica
description	White dwarfs are well studied objects. The relative simplicity of their physics allows to obtain very detailed models which can be ultimately compared with their observed properties. Among white dwarfs there is a speciﬁc class of stars, known as ZZ-Ceti objects, which have a hydrogen-rich envelope and show periodic variations in their light curves. G117-B15A belongs to this particular set of stars. The luminosity variations have been successfully explained as due to g-mode pulsations. G117-B15A has been recently claimed to be the most stable optical clock ever found, being the rate of change of its 215.2 s period very small: P˙ = (2.3±1.4)×10<SUP>−15</SUP>ss<SUP>−1</SUP>, with a stability comparable to that of the most stable millisecond pulsars. The rate of change of the period is closely related to its cooling timescale, which can be accurately computed. In this paper we study the pulsational properties of G117-B15A and we use the observed rate of change of the period to impose constraints on the axion emissivity and, thus, to obtain a preliminary upper bound to the mass of the axion. This upper bound turns out to be 4cos<SUP>2</SUP> β meV at the 95% conﬁdence level. Although there are still several observational and theoretical uncertainties, we conclude that G117-B15A is a very promising stellar object to set up constraints on particle physics.
format	Articulo Preprint
author	Córsico, Alejandro Hugo Benvenuto, Omar Gustavo Althaus, Leandro Gabriel Isern, Jordi García Berro, Enrique
author_facet	Córsico, Alejandro Hugo Benvenuto, Omar Gustavo Althaus, Leandro Gabriel Isern, Jordi García Berro, Enrique
author_sort	Córsico, Alejandro Hugo
title	The potential of the variable DA white dwarf G117-B15A as a tool for Fundamental Physics
title_short	The potential of the variable DA white dwarf G117-B15A as a tool for Fundamental Physics
title_full	The potential of the variable DA white dwarf G117-B15A as a tool for Fundamental Physics
title_fullStr	The potential of the variable DA white dwarf G117-B15A as a tool for Fundamental Physics
title_full_unstemmed	The potential of the variable DA white dwarf G117-B15A as a tool for Fundamental Physics
title_sort	potential of the variable da white dwarf g117-b15a as a tool for fundamental physics
publishDate	2001
url	http://sedici.unlp.edu.ar/handle/10915/2066 http://arxiv.org/pdf/astro-ph/0104103v1.pdf http://www.sciencedirect.com/science/article/pii/S1384107601000550
work_keys_str_mv	AT corsicoalejandrohugo thepotentialofthevariabledawhitedwarfg117b15aasatoolforfundamentalphysics AT benvenutoomargustavo thepotentialofthevariabledawhitedwarfg117b15aasatoolforfundamentalphysics AT althausleandrogabriel thepotentialofthevariabledawhitedwarfg117b15aasatoolforfundamentalphysics AT isernjordi thepotentialofthevariabledawhitedwarfg117b15aasatoolforfundamentalphysics AT garciaberroenrique thepotentialofthevariabledawhitedwarfg117b15aasatoolforfundamentalphysics AT corsicoalejandrohugo potentialofthevariabledawhitedwarfg117b15aasatoolforfundamentalphysics AT benvenutoomargustavo potentialofthevariabledawhitedwarfg117b15aasatoolforfundamentalphysics AT althausleandrogabriel potentialofthevariabledawhitedwarfg117b15aasatoolforfundamentalphysics AT isernjordi potentialofthevariabledawhitedwarfg117b15aasatoolforfundamentalphysics AT garciaberroenrique potentialofthevariabledawhitedwarfg117b15aasatoolforfundamentalphysics
bdutipo_str	Repositorios
_version_	1764820464704684032

The potential of the variable DA white dwarf G117-B15A as a tool for Fundamental Physics

Ejemplares similares