High-amplitude gamma Doradus variables

J 2020

High-amplitude gamma Doradus variables

PAUNZEN, Ernst; Klaus BERNHARD; Stefan HÜMMERICH; Franz Josef HAMBSCH; Christopher LLOYD et. al.

Základní údaje

Originální název

High-amplitude gamma Doradus variables

Autoři

PAUNZEN, Ernst (40 Rakousko, garant, domácí); Klaus BERNHARD; Stefan HÜMMERICH; Franz Josef HAMBSCH; Christopher LLOYD a Sebastián A. OTERO

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/00216224:14310/20:00117438

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1093/mnras/staa2905

UT WoS

000593116100065

EID Scopus

2-s2.0-85097112220

Klíčová slova anglicky

stars: oscillations; stars: variables: general

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 4. 1. 2021 16:10, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

According to most literature sources, the amplitude of the pulsational variability observed in gamma Doradus stars does not exceed 0.1 mag in Johnson V. We have analysed fifteen high-amplitude gamma Doradus stars with photometric peak-to-peak amplitudes well beyond this limit, with the aim of unraveling the mechanisms behind the observed high amplitudes and investigating whether these objects are in any way physically distinct from their low-amplitude counterparts. We have calculated astrophysical parameters and investigated the location of the high-amplitude gamma Doradus stars and a control sample of fifteen low-amplitude objects in the log T-eff versus log L/L-circle dot diagram. Employing survey data and our own observations, we analysed the photometric variability of our target stars using discrete Fourier transform. Correlations between the observed primary frequencies, amplitudes and other parameters like effective temperature and luminosity were investigated. The unusually high amplitudes of the high-amplitude gamma Doradus stars can be explained by the superposition of several base frequencies in interaction with their combination and overtone frequencies. Although the maximum amplitude of the primary frequencies does not exceed an amplitude of 0.1 mag, total light variability amplitudes of over 0.3 mag (V) can be attained in this way. Low- and high-amplitude gamma Doradus stars do not appear to be physically distinct in any other respect than their total variability amplitudes but merely represent two ends of the same, uniform group of variables.

Citovat

PAUNZEN, Ernst; Klaus BERNHARD; Stefan HÜMMERICH; Franz Josef HAMBSCH; Christopher LLOYD a Sebastián A. OTERO. High-amplitude gamma Doradus variables. Monthly Notices of the Royal Astronomical Society. Oxford: Oxford University Press, 2020, roč. 499, č. 3, s. 3976-3991. ISSN 0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/staa2905.

@article{1712316,
   author = {Paunzen, Ernst and Bernhard, Klaus and Hümmerich, Stefan and Hambsch, Franz Josef and Lloyd, Christopher and Otero, Sebastián A.},
   article_location = {Oxford},
   article_number = {3},
   doi = {http://dx.doi.org/10.1093/mnras/staa2905},
   keywords = {stars: oscillations; stars: variables: general},
   language = {eng},
   issn = {0035-8711},
   journal = {Monthly Notices of the Royal Astronomical Society},
   title = {High-amplitude gamma Doradus variables},
   url = {https://doi.org/10.1093/mnras/staa2905},
   volume = {499},
   year = {2020}
}

TY  - JOUR
ID  - 1712316
AU  - Paunzen, Ernst - Bernhard, Klaus - Hümmerich, Stefan - Hambsch, Franz Josef - Lloyd, Christopher - Otero, Sebastián A.
PY  - 2020
TI  - High-amplitude gamma Doradus variables
JF  - Monthly Notices of the Royal Astronomical Society
VL  - 499
IS  - 3
SP  - 3976-3991
EP  - 3976-3991
PB  - Oxford University Press
SN  - 00358711
KW  - stars: oscillations
KW  - stars: variables: general
UR  - https://doi.org/10.1093/mnras/staa2905
L2  - https://doi.org/10.1093/mnras/staa2905
N2  - According to most literature sources, the amplitude of the pulsational variability observed in gamma Doradus stars does not exceed 0.1 mag in Johnson V. We have analysed fifteen high-amplitude gamma Doradus stars with photometric peak-to-peak amplitudes well beyond this limit, with the aim of unraveling the mechanisms behind the observed high amplitudes and investigating whether these objects are in any way physically distinct from their low-amplitude counterparts. We have calculated astrophysical parameters and investigated the location of the high-amplitude gamma Doradus stars and a control sample of fifteen low-amplitude objects in the log T-eff versus log L/L-circle dot diagram. Employing survey data and our own observations, we analysed the photometric variability of our target stars using discrete Fourier transform. Correlations between the observed primary frequencies, amplitudes and other parameters like effective temperature and luminosity were investigated. The unusually high amplitudes of the high-amplitude gamma Doradus stars can be explained by the superposition of several base frequencies in interaction with their combination and overtone frequencies. Although the maximum amplitude of the primary frequencies does not exceed an amplitude of 0.1 mag, total light variability amplitudes of over 0.3 mag (V) can be attained in this way. Low- and high-amplitude gamma Doradus stars do not appear to be physically distinct in any other respect than their total variability amplitudes but merely represent two ends of the same, uniform group of variables.
ER  -

PAUNZEN, Ernst; Klaus BERNHARD; Stefan HÜMMERICH; Franz Josef HAMBSCH; Christopher LLOYD a Sebastián A. OTERO. High-amplitude gamma Doradus variables. \textit{Monthly Notices of the Royal Astronomical Society}. Oxford: Oxford University Press, 2020, roč.~499, č.~3, s.~3976-3991. ISSN~0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/staa2905.

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