Structural parameters of the hot pulsating B subdwarf PG 1219+534 from asteroseismology

S. Charpinet; G. Fontaine; P. Brassard; E. M. Green; P. Chayer

doi:10.1051/0004-6361:20052709

Structural parameters of the hot pulsating B subdwarf PG 1219+534 from asteroseismology

S. Charpinet, G. Fontaine, P. Brassard, E. M. Green, P. Chayer

Steward Observatory

Research output: Contribution to journal › Article › peer-review

84 Scopus citations

Abstract

The observations and thorough analysis of the rapidly pulsating sdB star PG 1219+534 were discussed. A standard Fourier analysis of our high signal-to-noise ratio Canada-France-Hawaii Telescope (CFHT) light curves revealed the presence of nine distinct harmonic oscillations with periods in the range 122-172 s. It was found that PG 1219+534 had a relatively simple pulsation spectrum characterized by well separated components easily recognizable as independent modes. The results show that the optimal model solution was able to produce simultaneously the 9 periods observed in pG 1219+534 with an average dispersion of only ∼0.6%.

Original language	English (US)
Pages (from-to)	575-597
Number of pages	23
Journal	Astronomy and astrophysics
Volume	437
Issue number	2
DOIs	https://doi.org/10.1051/0004-6361:20052709
State	Published - Jul 2005

Keywords

Stars: fundamental parameters
Stars: horizontal-branch
Stars: individual: PG 1219+534
Stars: interiors
Stars: oscillations
Stars: subdwarfs

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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title = "Structural parameters of the hot pulsating B subdwarf PG 1219+534 from asteroseismology",

abstract = "The observations and thorough analysis of the rapidly pulsating sdB star PG 1219+534 were discussed. A standard Fourier analysis of our high signal-to-noise ratio Canada-France-Hawaii Telescope (CFHT) light curves revealed the presence of nine distinct harmonic oscillations with periods in the range 122-172 s. It was found that PG 1219+534 had a relatively simple pulsation spectrum characterized by well separated components easily recognizable as independent modes. The results show that the optimal model solution was able to produce simultaneously the 9 periods observed in pG 1219+534 with an average dispersion of only ∼0.6%.",

keywords = "Stars: fundamental parameters, Stars: horizontal-branch, Stars: individual: PG 1219+534, Stars: interiors, Stars: oscillations, Stars: subdwarfs",

author = "S. Charpinet and G. Fontaine and P. Brassard and Green, {E. M.} and P. Chayer",

year = "2005",

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language = "English (US)",

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T1 - Structural parameters of the hot pulsating B subdwarf PG 1219+534 from asteroseismology

AU - Charpinet, S.

AU - Fontaine, G.

AU - Brassard, P.

AU - Green, E. M.

AU - Chayer, P.

PY - 2005/7

Y1 - 2005/7

N2 - The observations and thorough analysis of the rapidly pulsating sdB star PG 1219+534 were discussed. A standard Fourier analysis of our high signal-to-noise ratio Canada-France-Hawaii Telescope (CFHT) light curves revealed the presence of nine distinct harmonic oscillations with periods in the range 122-172 s. It was found that PG 1219+534 had a relatively simple pulsation spectrum characterized by well separated components easily recognizable as independent modes. The results show that the optimal model solution was able to produce simultaneously the 9 periods observed in pG 1219+534 with an average dispersion of only ∼0.6%.

AB - The observations and thorough analysis of the rapidly pulsating sdB star PG 1219+534 were discussed. A standard Fourier analysis of our high signal-to-noise ratio Canada-France-Hawaii Telescope (CFHT) light curves revealed the presence of nine distinct harmonic oscillations with periods in the range 122-172 s. It was found that PG 1219+534 had a relatively simple pulsation spectrum characterized by well separated components easily recognizable as independent modes. The results show that the optimal model solution was able to produce simultaneously the 9 periods observed in pG 1219+534 with an average dispersion of only ∼0.6%.

KW - Stars: fundamental parameters

KW - Stars: horizontal-branch

KW - Stars: individual: PG 1219+534

KW - Stars: interiors

KW - Stars: oscillations

KW - Stars: subdwarfs

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Structural parameters of the hot pulsating B subdwarf PG 1219+534 from asteroseismology

Abstract

Keywords

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