PRUDIL, Zdeněk, Radoslaw SMOLEC, Marek SKARKA a Henryka NETZEL. Peculiar double-periodic pulsation in RR Lyrae stars of the OGLE collection - II. Short-period stars with a dominant radial fundamental mode. Monthly Notices of the Royal Astronomical Society. Oxford: Oxford University Press, roč. 465, č. 4, s. 4074-4084. ISSN 0035-8711. doi:10.1093/mnras/stw3010. 2017.
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Základní údaje
Originální název Peculiar double-periodic pulsation in RR Lyrae stars of the OGLE collection - II. Short-period stars with a dominant radial fundamental mode
Autoři PRUDIL, Zdeněk (203 Česká republika, garant, domácí), Radoslaw SMOLEC, Marek SKARKA (203 Česká republika) a Henryka NETZEL.
Vydání Monthly Notices of the Royal Astronomical Society, Oxford, Oxford University Press, 2017, 0035-8711.
Další údaje
Originální 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
WWW Full Text
Impakt faktor Impact factor: 5.194
Kód RIV RIV/00216224:14310/17:00108887
Organizační jednotka Přírodovědecká fakulta
Doi http://dx.doi.org/10.1093/mnras/stw3010
UT WoS 000395170200024
Klíčová slova anglicky stars: horizontal branch; stars: oscillations; stars: variables: RR Lyrae; methods: data analysis
Štítky rivok
Příznaky Mezinárodní význam, Recenzováno
Změnil Změnila: Mgr. Marie Šípková, DiS., učo 437722. Změněno: 24. 2. 2020 15:20.
Anotace
We report the discovery of a new group of double-periodic stars in the OGLE Galactic bulge photometry. In 38 stars identified as fundamental-mode RR Lyrae and four classified as firstovertone RR Lyrae, we detected an additional shorter periodicity. The periods of the dominant variability in the newly discovered group are 0.28 < P-D < 0.41 d. Period ratios (0.68-0.72) are smaller than the period ratios of the Galactic bulge RRd stars. The typical amplitude ratio (of the additional to the dominant periodicity) is 20 per cent for the stars identified as fundamental-mode RR Lyrae and 50 per cent for stars classified as first-overtone RR Lyrae. 10 stars from our sample exhibit equidistant peaks in the frequency spectrum, which suggests the Blazhko-type modulation of the main pulsation frequency and/ or additional periodicity. The Fourier coefficients R-21 and R-31 are some of the lowest among fundamental-mode RR Lyrae stars, but among the highest for the first-overtone pulsators. For the phase Fourier coefficients phi(21) and phi(31), our stars lie between RRab and RRc stars. The stars discussedwere compared with radial linear pulsation models. Their position in the Petersen diagram cannot be reproduced by assuming that two radial modes are excited and their physical parameters are like those characteristic of RR Lyrae stars. The non-radial-mode scenario also faces difficulties. We conclude that the dominant variability is most likely due to pulsation in the radial fundamental mode, which applies to stars classified as first-overtone mode pulsators. At this point, we cannot explain the nature of the additional periodicity. Even more, the classification of the stars as RR Lyrae should be treated as tentative.
VytisknoutZobrazeno: 28. 3. 2024 14:40