The pulsation properties of lambda bootis stars I. the southern
TESS sample

J 2020

The pulsation properties of lambda bootis stars I. the southern TESS sample

MURPHY, Simon; Ernst PAUNZEN; Tim BEDDING; Przemyslaw WALCZAK; Daniel HUBER et al.

Základní údaje

Originální název

The pulsation properties of lambda bootis stars I. the southern TESS sample

Autoři

MURPHY, Simon; Ernst PAUNZEN; Tim BEDDING; Przemyslaw WALCZAK a Daniel HUBER

Vydání

Monthly Notices of the Royal Astronomical Society, Oxford, Oxford University Press, 2020, 0035-8711

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 5.287

Kód RIV

RIV/00216224:14310/20:00116124

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.1093/mnras/staa1271

UT WoS

000543015800025

EID Scopus

2-s2.0-85095536018

Klíčová slova anglicky

asteroseismology; stars: chemically peculiar; stars: oscillations

Štítky

14312040, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 16. 4. 2021 16:14, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

We analyse TESS light curves for 70 southern lambda Boo stars to identify binaries and to determine which of them pulsate as delta Scuti stars. We find two heartbeat stars and two eclipsing binaries among the sample. We calculate that 81 per cent of lambda Boo stars pulsate as delta Sct variables, which is about twice that of normal stars over the same parameter space. We determine the temperatures and luminosities of the lambda Boo stars from photometry and Gaia DR2 parallaxes. A subset of 40 lambda Boo stars have 2-min TESS data, reliable temperatures and luminosities, and delta Sct pulsation. We use Petersen diagrams (period ratios), echelle diagrams, and the periodluminosity relation to identify the fundamental mode in 20 of those 40 stars and conclude that a further 8 stars are not pulsating in this mode. For the remaining 12, the fundamental mode cannot be unambiguously identified. Further mode identification is possible for 12 of the fundamental mode pulsators that have regular sequences of pulsation overtones in their echelle diagrams. We use stellar evolutionmodels to determine statistically that the lambda Boo stars are only superficially metal weak. Simple pulsation models also better fit the observations at a metallicity of Z = 0.01 than at Z = 0.001. The TESS observations reveal the great potential of asteroseismology on lambda Boo stars, for determining precise stellar ages and shedding light on the origin(s) of the lambda Boo phenomenon.

Citovat

MURPHY, Simon; Ernst PAUNZEN; Tim BEDDING; Przemyslaw WALCZAK a Daniel HUBER. The pulsation properties of lambda bootis stars I. the southern TESS sample. Monthly Notices of the Royal Astronomical Society. Oxford: Oxford University Press, 2020, roč. 495, č. 2, s. 1888-1912. ISSN 0035-8711. Dostupné z: https://doi.org/10.1093/mnras/staa1271.

@article{1673081,
   author = {Murphy, Simon and Paunzen, Ernst and Bedding, Tim and Walczak, Przemyslaw and Huber, Daniel},
   article_location = {Oxford},
   article_number = {2},
   doi = {https://doi.org/10.1093/mnras/staa1271},
   keywords = {asteroseismology; stars: chemically peculiar; stars: oscillations},
   language = {eng},
   issn = {0035-8711},
   journal = {Monthly Notices of the Royal Astronomical Society},
   title = {The pulsation properties of lambda bootis stars I. the southern TESS sample},
   url = {https://academic.oup.com/mnras/article-abstract/495/2/1888/5834555},
   volume = {495},
   year = {2020}
}

TY  - JOUR
ID  - 1673081
AU  - Murphy, Simon - Paunzen, Ernst - Bedding, Tim - Walczak, Przemyslaw - Huber, Daniel
PY  - 2020
TI  - The pulsation properties of lambda bootis stars I. the southern TESS sample
JF  - Monthly Notices of the Royal Astronomical Society
VL  - 495
IS  - 2
SP  - 1888-1912
EP  - 1888-1912
PB  - Oxford University Press
SN  - 00358711
KW  - asteroseismology
KW  - stars: chemically peculiar
KW  - stars: oscillations
UR  - https://academic.oup.com/mnras/article-abstract/495/2/1888/5834555
L2  - https://academic.oup.com/mnras/article-abstract/495/2/1888/5834555
N2  - We analyse TESS light curves for 70 southern lambda Boo stars to identify binaries and to determine which of them pulsate as delta Scuti stars. We find two heartbeat stars and two eclipsing binaries among the sample. We calculate that 81 per cent of lambda Boo stars pulsate as delta Sct variables, which is about twice that of normal stars over the same parameter space. We determine the temperatures and luminosities of the lambda Boo stars from photometry and Gaia DR2 parallaxes. A subset of 40 lambda Boo stars have 2-min TESS data, reliable temperatures and luminosities, and delta Sct pulsation. We use Petersen diagrams (period ratios), echelle diagrams, and the periodluminosity relation to identify the fundamental mode in 20 of those 40 stars and conclude that a further 8 stars are not pulsating in this mode. For the remaining 12, the fundamental mode cannot be unambiguously identified. Further mode identification is possible for 12 of the fundamental mode pulsators that have regular sequences of pulsation overtones in their echelle diagrams. We use stellar evolutionmodels to determine statistically that the lambda Boo stars are only superficially metal weak. Simple pulsation models also better fit the observations at a metallicity of Z = 0.01 than at Z = 0.001. The TESS observations reveal the great potential of asteroseismology on lambda Boo stars, for determining precise stellar ages and shedding light on the origin(s) of the lambda Boo phenomenon.
ER  -

MURPHY, Simon; Ernst PAUNZEN; Tim BEDDING; Przemyslaw WALCZAK a Daniel HUBER. The pulsation properties of lambda bootis stars I. the southern TESS sample. \textit{Monthly Notices of the Royal Astronomical Society}. Oxford: Oxford University Press, 2020, roč.~495, č.~2, s.~1888-1912. ISSN~0035-8711. Dostupné z: https://doi.org/10.1093/mnras/staa1271.

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