Results 51 to 60 of about 2,679,498 (179)

Pulsation Properties of Blazhko and Non-Blazhko RRab Stars

The Astrophysical Journal Supplement Series
In this study, we conduct a comparative analysis of the properties of Blazhko and non-Blazhko RRab stars. We identified 1054 non-Blazhko and 785 Blazhko RRab stars in the photometric data observed by the K2 mission, which, combined with those 37 stars ...
Peng Zong, Jian-Ning Fu, Jie Su, Bing-Kai Zhang, Gao-Chao Liu, Weichao Sun, Jiaxin Wang, Bo Zhang, Xueying Hu, Zhongrui Bai, Weikai Zong   +10 more
doaj   +1 more source

The magnificent past of RR Lyrae variables [PDF]

, 2016
We briefly review the results obtained by using the times of maximum brightness of RR Lyrae variables. They cover more than 120 years and have been used to study the evolutionary changes of the pulsational periods, the different shapes of the Blazhko ...
Le Borgne, J. -F., Klotz, A., PORETTI, Ennio, Audejean, M., Hirosawa, K.   +4 more
core  

The RR Lyrae Luminosity Metallicity Relation Revisited

The Astronomical Journal
We utilize a set of internally consistent absolute ages for a sample of ten Galactic globular clusters to determine the variation of the slope with the zero point of the M _V (RR) ∼ [Fe/H] relation for RR Lyrae variables.
Ata Sarajedini
doaj   +1 more source

Precise Empirical Determination of Metallicity Dependence of Near-infrared Period–Luminosity Relations for RR Lyrae Variables

The Astrophysical Journal Letters, 2023
RR Lyrae variables are excellent Population II distance indicators thanks to their well-defined period–luminosity relations (PLRs) at infrared wavelengths.
Anupam Bhardwaj, Marcella Marconi, Marina Rejkuba, Richard de Grijs, Harinder P. Singh, Vittorio F. Braga, Shashi Kanbur, Chow-Choong Ngeow, Vincenzo Ripepi, Giuseppe Bono, Giulia De Somma, Massimo Dall’Ora   +11 more
doaj   +1 more source

Helium abundance effects on RR Lyrae pulsation properties [PDF]

, 2016
A new set of nonlinear convective pulsation models of RR Lyrae stars has been computed varying both the metallicity and the helium content. To constrain the helium dependence of pulsation observables we adopted, for each metal content, at least three ...
MARCONI, Marcella, Coppola, G., Braga, Vittorio Francesco, PIETRINFERNI, Adriano, Bono, G.   +4 more
core  

Asteroseismological Analysis of the Non-Blazhko RRab Star EPIC 248846335 in the LAMOST–Kepler/K2 Project

The Astronomical Journal
We conduct an asteroseismological analysis on the non-Blazhko ab-type RR Lyrae star EPIC 248846335, employing the Radial Stellar Pulsations module of the Modules for Experiments in Stellar Astrophysics based on the set of stellar parameters.
Peng Zong, Jian-Ning Fu, Jie Su, Xueying Hu, Bo Zhang, Jiaxin Wang, Gao-Chao Liu, Gang Meng, Gianni Catanzaro, Antonio Frasca, Haotian Wang, Weikai Zong   +11 more
doaj   +1 more source

Two Different Weak Modulations in ab-type RR Lyrae Variable V838 Cyg, and Potential Influence of Metal Abundance on Blazhko Modulation

The Astronomical Journal, 2023
Noting the weakest modulation and relatively high metal abundance of the ab-type RR Lyrae star V838 Cyg, we collected the photometric data of this star from several sky surveys to carry out an in-depth analysis. The O − C diagram shows that the pulsation
L.-J. Li, S.-B. Qian, X.-D. Shi, L.-Y. Zhu   +3 more
doaj   +1 more source

Cyclic Variations in the Periods of RR Lyrae Stars [PDF]

, 2018
We report here on two types of cyclic variations that can be observed in the periods of RR Lyrae stars, i.e., the Blazhko and the light-time effects. The former has been investigated by studying the amplitude variations recorded in RR Lyr itself, firstly
Correa, Mercedes, Klotz, Alain, PORETTI, Ennio, Le Borgne, Jean-François, RAINER, Monica   +4 more
core  

Creating a Gold Standard Set of KELT RR Lyrae Stars

, 2020
2020 Celebration of Student Research and Creativity presentationThe Kilodegree Extremely Little Telescope (KELT) Survey is an exoplanet hunting survey that also finds variable stars.  In this project, we focus on  a type of pulsating variable star called
Fryman, Jacob
core   +1 more source

Faint (and bright) variable stars in the satellites of the Milky Way

EPJ Web of Conferences, 2017
I describe two ongoing projects related with variable stars in the satellites of the MilkyWay. In the first project, we are searching for dwarf Cepheid stars (a.k.a δ Scuti and/or SX Phe) in some of the classical dwarf spheroidal galaxies. Our goal is to
Vivas A. Katherina
doaj   +1 more source