Confirmation and revision on the orbital period change of the possible type Ia supernova progenitor V617 Sagittarii

This work reports new photometric results of eclipsing cataclysmic variable V617 Sagittarii (V617 Sgr). We analyzed the orbital period change of V617 Sgr by employing three new (since 2010) CCD eclipse timings along with all the available data from the literature. It was found that the orbital perio...

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Detalles Bibliográficos
Autores principales: Shi, Guang, Qian, Sheng Bang, Fernández Lajús, Eduardo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Ciencias Astronómicas
binaries: close
binaries: eclipsing
stars: evolution
stars: individual (V617 Sgr)
stars: winds, outflows
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85208
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85208
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
binaries: close
binaries: eclipsing
stars: evolution
stars: individual (V617 Sgr)
stars: winds, outflows
spellingShingle Ciencias Astronómicas
binaries: close
binaries: eclipsing
stars: evolution
stars: individual (V617 Sgr)
stars: winds, outflows
Shi, Guang
Qian, Sheng Bang
Fernández Lajús, Eduardo
Confirmation and revision on the orbital period change of the possible type Ia supernova progenitor V617 Sagittarii
topic_facet Ciencias Astronómicas
binaries: close
binaries: eclipsing
stars: evolution
stars: individual (V617 Sgr)
stars: winds, outflows
description This work reports new photometric results of eclipsing cataclysmic variable V617 Sagittarii (V617 Sgr). We analyzed the orbital period change of V617 Sgr by employing three new (since 2010) CCD eclipse timings along with all the available data from the literature. It was found that the orbital period of V617 Sgr undergoes an obvious long-term increase, which confirms the result revealed by Steiner et al. (2006). The rate of orbital period increase was calculated to be P = +2.14(0.05) × 10<SUP>-7</SUP> d yr<SUP>-1</SUP>. This suggests the lifetime of the secondary star will end in a timescale of 0.97 × 10<SUP>6</SUP> yr faster than that predicted previously. In particular, a cyclic variation with a period of 4.5 yr and an amplitude of 2.3 min may appear in the O - C diagram. Dominated by the wind-accretion mechanism, high mass transfer from the low mass secondary to the white dwarf is expected to continue in the V Sge-type star V617 Sgr during its long-term evolution. The mass transfer rate |M<SUB>tr</SUB>| was estimated to be in the range of about 2.2 × 10<SUP>-7</SUP> to 5.2 × 10<SUP>-7</SUP> M⊙ yr<SUP>-1</SUP>. Accordingly, the already massive (≥ 1.2 M⊙) white dwarf primary will process stable nuclear burning, accrete a fraction of the mass from its companion to reach the standard Chandrasekhar mass limit (≃ 1.38 M⊙), and ultimately produce a type Ia supernova (SN Ia) within about 4-8 × 10<SUP>5</SUP> yr or earlier.
format Articulo
Articulo
author Shi, Guang
Qian, Sheng Bang
Fernández Lajús, Eduardo
author_facet Shi, Guang
Qian, Sheng Bang
Fernández Lajús, Eduardo
author_sort Shi, Guang
title Confirmation and revision on the orbital period change of the possible type Ia supernova progenitor V617 Sagittarii
title_short Confirmation and revision on the orbital period change of the possible type Ia supernova progenitor V617 Sagittarii
title_full Confirmation and revision on the orbital period change of the possible type Ia supernova progenitor V617 Sagittarii
title_fullStr Confirmation and revision on the orbital period change of the possible type Ia supernova progenitor V617 Sagittarii
title_full_unstemmed Confirmation and revision on the orbital period change of the possible type Ia supernova progenitor V617 Sagittarii
title_sort confirmation and revision on the orbital period change of the possible type ia supernova progenitor v617 sagittarii
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/85208
work_keys_str_mv AT shiguang confirmationandrevisionontheorbitalperiodchangeofthepossibletypeiasupernovaprogenitorv617sagittarii
AT qianshengbang confirmationandrevisionontheorbitalperiodchangeofthepossibletypeiasupernovaprogenitorv617sagittarii
AT fernandezlajuseduardo confirmationandrevisionontheorbitalperiodchangeofthepossibletypeiasupernovaprogenitorv617sagittarii
bdutipo_str Repositorios
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