2026-04-13T01:32:21Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/1042102026-01-28T04:22:46Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Córsico, Alejandro H. author Romero, Alejandra Daniela author Althaus, Leandro G. author García-Berro Montilla, Enrique author Isern Vilaboy, Jordi author Kepler, S.O. author Miller Bartolami, Marcelo M. author Sullivan, Denis J. author 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 Reviewed Postprint (published version) 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