2026-04-13T07:16:07Zhttps://recercat.cat/oai/requestoai:recercat.cat:2117/1042102026-01-28T04:22:46Zcom_2072_1033col_2072_452950
RECERCAT
author
Córsico, Alejandro H.
author
Romero, Alejandra Daniela
author
Althaus, Leandro G.
author
García-Berro Montilla, Enrique
author
Isern Vilaboy, Jordi
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Kepler, S.O.
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Miller Bartolami, Marcelo M.
author
Sullivan, Denis J.
2016-07-01
We employ an asteroseismic model of L19-2, a relatively massive (Msstarf ~ 0.75 M¿) and hot (Teff ~ 12 100 K) pulsating DA (H-rich atmosphere) white dwarf star (DAV or ZZ Ceti variable), and use the observed values of the temporal rates of period change of its dominant pulsation modes (¿ ~ 113 s and ¿ ~ 192 s), to derive a new constraint on the mass of the axion, the hypothetical non-barionic particle considered as a possible component of the dark matter of the Universe. If the asteroseismic model employed is an accurate representation of L19-2, then our results indicate hints of extra cooling in this star, compatible with emission of axions of mass ma cos2ß lesssim 25 meV or an axion-electron coupling constant of gae lesssim 7 × 10-13.Peer ReviewedPostprint (published version)
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access Attribution-NonCommercial-NoDerivs 3.0 Spain
Àrees temàtiques de la UPC::Física::Astronomia i astrofísica
White dwarfs
Particles (Nuclear physics)
Elementary particles - stars
Oscillations - stars
ZZ Ceti stars
White dwarfs
Estels nans
An asteroseismic constraint on the mass of the axion from the period drift of the pulsating da white dwarf star L19-2
Article