Pulsational properties of ten new slowly pulsating B stars

J 2020

Pulsational properties of ten new slowly pulsating B stars

FEDURCO, Miroslav, Ernst PAUNZEN, Stefan HUEMMERICH, Klaus BERNHARD, Stefan PARIMUCHA et. al.

Základní údaje

Originální název

Pulsational properties of ten new slowly pulsating B stars

Autoři

FEDURCO, Miroslav (703 Slovensko), Ernst PAUNZEN (40 Rakousko, garant, domácí), Stefan HUEMMERICH (276 Německo), Klaus BERNHARD (40 Rakousko) a Stefan PARIMUCHA (703 Slovensko)

Vydání

Astronomy & Astrophysics, Les Ulis Cedex, EDP Sciences, 2020, 0004-6361

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Francie

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 5.802

Kód RIV

RIV/00216224:14310/20:00115735

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1051/0004-6361/201935478

UT WoS

000508936600004

Klíčová slova anglicky

asteroseismology; stars: early-type; stars: variables: general

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 23. 11. 2020 13:27, Mgr. Marie Šípková, DiS.

Anotace

V originále

Context. Slowly pulsating B (SPB) stars are upper main-sequence multi-periodic pulsators that show non-radial g-mode oscillations driven by the kappa mechanism acting on the iron bump. These multi-periodic pulsators have great asteroseismic potential and can be employed for the calibration of stellar structure and evolution models of massive stars. Aims. We collected a sample of ten hitherto unidentified SPB stars with the aim of describing their pulsational properties and identifying pulsational modes. Methods. Photometric time series data from various surveys were collected and analyzed using diverse frequency search algorithms. We calculated astrophysical parameters and investigated the location of our sample stars in the log T-eff vs. log L/L-circle dot diagram. Current pulsational models were calculated and used for the identification of pulsational modes in our sample stars. An extensive grid of stellar models along with their g-mode eigenfrequencies was calculated and subsequently cross-matched with the observed pulsational frequencies. The best-fit models were then used in an attempt to constrain stellar parameters such as mass, age, metallicity, and convective overshoot. Results. We present detected frequencies, corresponding g-mode identifications, and the masses and ages of the stellar models producing the best frequency cross-matches. We partially succeeded in constraining stellar parameters, in particular concerning mass and age. Where applicable, rotation periods have been derived from the spacing of triplet component frequencies. No evolved SPB stars are present in our sample. We identify two candidate high-metallicity objects (HD 86424 and HD 163285), one young SPB star (HD 36999), and two candidate young SPB stars (HD 61712 and HD 61076). Conclusions. We demonstrate the feasibility of using ground-based observations to perform basic asteroseismological analyses of SPB stars. Our results significantly enlarge the sample of known SPB stars with reliable pulsational mode identifications, which provides important input parameters for modeling attempts aiming to investigate the internal processes at work in upper main-sequence stars.

Citovat

FEDURCO, Miroslav, Ernst PAUNZEN, Stefan HUEMMERICH, Klaus BERNHARD a Stefan PARIMUCHA. Pulsational properties of ten new slowly pulsating B stars. Astronomy & Astrophysics. Les Ulis Cedex: EDP Sciences, 2020, roč. 633, č. 1, s. 122-132. ISSN 0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201935478.

@article{1660117,
   author = {Fedurco, Miroslav and Paunzen, Ernst and Huemmerich, Stefan and Bernhard, Klaus and Parimucha, Stefan},
   article_location = {Les Ulis Cedex},
   article_number = {1},
   doi = {http://dx.doi.org/10.1051/0004-6361/201935478},
   keywords = {asteroseismology; stars: early-type; stars: variables: general},
   language = {eng},
   issn = {0004-6361},
   journal = {Astronomy & Astrophysics},
   title = {Pulsational properties of ten new slowly pulsating B stars},
   url = {https://www.aanda.org/articles/aa/pdf/2020/01/aa35478-19.pdf},
   volume = {633},
   year = {2020}
}

TY  - JOUR
ID  - 1660117
AU  - Fedurco, Miroslav - Paunzen, Ernst - Huemmerich, Stefan - Bernhard, Klaus - Parimucha, Stefan
PY  - 2020
TI  - Pulsational properties of ten new slowly pulsating B stars
JF  - Astronomy & Astrophysics
VL  - 633
IS  - 1
SP  - 122-132
EP  - 122-132
PB  - EDP Sciences
SN  - 00046361
KW  - asteroseismology
KW  - stars: early-type
KW  - stars: variables: general
UR  - https://www.aanda.org/articles/aa/pdf/2020/01/aa35478-19.pdf
L2  - https://www.aanda.org/articles/aa/pdf/2020/01/aa35478-19.pdf
N2  - Context. Slowly pulsating B (SPB) stars are upper main-sequence multi-periodic pulsators that show non-radial g-mode oscillations driven by the kappa mechanism acting on the iron bump. These multi-periodic pulsators have great asteroseismic potential and can be employed for the calibration of stellar structure and evolution models of massive stars. Aims. We collected a sample of ten hitherto unidentified SPB stars with the aim of describing their pulsational properties and identifying pulsational modes. Methods. Photometric time series data from various surveys were collected and analyzed using diverse frequency search algorithms. We calculated astrophysical parameters and investigated the location of our sample stars in the log T-eff vs. log L/L-circle dot diagram. Current pulsational models were calculated and used for the identification of pulsational modes in our sample stars. An extensive grid of stellar models along with their g-mode eigenfrequencies was calculated and subsequently cross-matched with the observed pulsational frequencies. The best-fit models were then used in an attempt to constrain stellar parameters such as mass, age, metallicity, and convective overshoot. Results. We present detected frequencies, corresponding g-mode identifications, and the masses and ages of the stellar models producing the best frequency cross-matches. We partially succeeded in constraining stellar parameters, in particular concerning mass and age. Where applicable, rotation periods have been derived from the spacing of triplet component frequencies. No evolved SPB stars are present in our sample. We identify two candidate high-metallicity objects (HD 86424 and HD 163285), one young SPB star (HD 36999), and two candidate young SPB stars (HD 61712 and HD 61076). Conclusions. We demonstrate the feasibility of using ground-based observations to perform basic asteroseismological analyses of SPB stars. Our results significantly enlarge the sample of known SPB stars with reliable pulsational mode identifications, which provides important input parameters for modeling attempts aiming to investigate the internal processes at work in upper main-sequence stars.
ER  -

FEDURCO, Miroslav, Ernst PAUNZEN, Stefan HUEMMERICH, Klaus BERNHARD a Stefan PARIMUCHA. Pulsational properties of ten new slowly pulsating B stars. \textit{Astronomy \&{} Astrophysics}. Les Ulis Cedex: EDP Sciences, 2020, roč.~633, č.~1, s.~122-132. ISSN~0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201935478.

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