On the evolutionary status and pulsations of the recently discovered blue Large-Amplitude Pulsators (BLAPs)

The blue large-amplitude pulsators (BLAPs) constitute a new class of pulsating stars. They are hot stars with effective temperatures of ∼30 000 K and surface gravities of log g ∼ 4.9, that pulsate with periods in the range 20−40 min. Until now, their origin and evolutionary state, as well as the nat...

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Detalles Bibliográficos
Autores principales: Romero, Alejandra Daniela, Córsico, Alejandro Hugo, Althaus, Leandro Gabriel, Pelisoli, I., Kepler, S. O.
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2018
Materias:
Ciencias Astronómicas
stars:evolution
stars:variables:general
pre- white dwarf
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/93683
https://academic.oup.com/mnrasl/article/477/1/L30/4956058
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-93683
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
stars:evolution
stars:variables:general
pre- white dwarf
spellingShingle Ciencias Astronómicas
stars:evolution
stars:variables:general
pre- white dwarf
Romero, Alejandra Daniela
Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
Pelisoli, I.
Kepler, S. O.
On the evolutionary status and pulsations of the recently discovered blue Large-Amplitude Pulsators (BLAPs)
topic_facet Ciencias Astronómicas
stars:evolution
stars:variables:general
pre- white dwarf
description The blue large-amplitude pulsators (BLAPs) constitute a new class of pulsating stars. They are hot stars with effective temperatures of ∼30 000 K and surface gravities of log g ∼ 4.9, that pulsate with periods in the range 20−40 min. Until now, their origin and evolutionary state, as well as the nature of their pulsations, were not been unveiled. In this paper, we propose that the BLAPs are the hot counterpart of the already known pulsating pre-extremely low mass (pre-ELM) white dwarf (WD) stars, that are He-core low-mass stars resulting from interacting binary evolution. Using fully evolutionary sequences, we show that the BLAPs are well represented by pre-ELM WD models with high effective temperature and stellar masses ∼0.34 M⊙. From the analysis of their pulsational properties, we find that the observed variabilities can be explained by high-order non-radial g-mode pulsations or, in the case of the shortest periods, also by low-order radial modes, including the fundamental radial mode. The theoretical modes with periods in the observed range are unstable due to the κ mechanism associated with the Z-bump in the opacity at log T ∼ 5.25.
format Articulo
Preprint
author Romero, Alejandra Daniela
Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
Pelisoli, I.
Kepler, S. O.
author_facet Romero, Alejandra Daniela
Córsico, Alejandro Hugo
Althaus, Leandro Gabriel
Pelisoli, I.
Kepler, S. O.
author_sort Romero, Alejandra Daniela
title On the evolutionary status and pulsations of the recently discovered blue Large-Amplitude Pulsators (BLAPs)
title_short On the evolutionary status and pulsations of the recently discovered blue Large-Amplitude Pulsators (BLAPs)
title_full On the evolutionary status and pulsations of the recently discovered blue Large-Amplitude Pulsators (BLAPs)
title_fullStr On the evolutionary status and pulsations of the recently discovered blue Large-Amplitude Pulsators (BLAPs)
title_full_unstemmed On the evolutionary status and pulsations of the recently discovered blue Large-Amplitude Pulsators (BLAPs)
title_sort on the evolutionary status and pulsations of the recently discovered blue large-amplitude pulsators (blaps)
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/93683
https://academic.oup.com/mnrasl/article/477/1/L30/4956058
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