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Artículo

Two new pulsating low-mass pre-white dwarfs or SX Phoenicis stars?

Corti, Mariela AlejandraIcon ; Kanaan, Antonio; Corsico, Alejandro HugoIcon ; Kepler, S.O.; Althaus, Leandro GabrielIcon ; Koester, D.; Sánchez Arias, Julieta PazIcon
Fecha de publicación: 03/2016
Editorial: EDP Sciences
Revista: Astronomy and Astrophysics
ISSN: 0004-6361
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias Físicas

Resumen

Context. The discovery of pulsations in low-mass stars opens an opportunity to probe their interiors and determine their evolution by employing the tools of asteroseismology. Aims. We aim to analyse high-speed photometry of SDSS J145847.02+070754.46 and SDSS J173001.94+070600.25 and discover brightness variabilities. In order to locate these stars in the Teff − log g diagram, we fit optical spectra (SDSS) with synthetic non-magnetic spectra derived from model atmospheres. Methods. To carry out this study, we used the photometric data we obtained for these stars with the 2.15 m telescope at CASLEO, Argentina. We analysed their light curves and applied the discrete Fourier transform (FT) to determine the pulsation frequencies. Finally, we compare both stars in the Teff − log g diagram, with two known pre-white dwarfs and seven pulsating pre-ELM white dwarf stars, δ Scuti, and SX Phe stars Results. We report the discovery of pulsations in SDSS J145847.02+070754.46 and SDSS J173001.94+070600.25. We determine their effective temperature and surface gravity to be Teff = 7972 ± 200 K, log g = 4.25 ± 0.5 and Teff = 7925 ± 200 K, log g = 4.25 ± 0.5, respectively. With these parameters, these new pulsating low-mass stars can be identified with either ELM white dwarfs (with ~0.17 M⊙) or more massive SX Phe stars. We identified pulsation periods of 3278.7 and 1633.9 s for SDSS J145847.02+070754.46 and a pulsation period of 3367.1 s for SDSS J173001.94+070600.25. These two new objects, together with those of Maxted et al. (2013, 2014), indicate the possible existence of a new instability domain towards the late stages of evolution of low-mass white dwarf stars, although their identification with SX Phe stars cannot be discarded.
Palabras clave: White Dwarfs , Sdssj145847.02+070754.46 (Estrella) , Sdssj173001.94+070600.25 (Estrella) , Low Mass
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/25951
DOI: http://dx.doi.org/10.1051/0004-6361/201527458
URL: https://www.aanda.org/articles/aa/abs/2016/03/aa27458-15/aa27458-15.html
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Articulos de INST.ARG.DE RADIOASTRONOMIA (I)
Citación
Corti, Mariela Alejandra; Kanaan, Antonio; Corsico, Alejandro Hugo; Kepler, S.O.; Althaus, Leandro Gabriel; et al.; Two new pulsating low-mass pre-white dwarfs or SX Phoenicis stars?; EDP Sciences; Astronomy and Astrophysics; 587; 3-2016; 5-8
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