Results 61 to 70 of about 224 (157)

Dealing With δ-Scuti Variables: Transit Light Curve Analysis of Planets Orbiting Rapidly Rotating, Seismically Active A/F Stars [PDF]

The Astronomical Journal, 2019
Abstract We measure the bulk system parameters of the seismically active, rapidly rotating δ-Scuti KOI-976 and constrain the orbit geometry of its transiting binary companion using a combined approach of asteroseismology and gravity-darkening light curve analysis. KOI-976 is a 1.62 ± 0.2 M ⊙ star with a measured v sin(i)
John P. Ahlers, Jason W. Barnes, Samuel A. Myers   +2 more
openaire   +2 more sources

The puzzling new class of variable stars in NGC 3766 : old friend pulsators? [PDF]

, 2014
peer reviewedThe recent variability survey of the NGC 3766 cluster revealed a considerable number of periodic variable stars in a region of the H-R diagram where no pulsation is expected. This region lies between the instability strips of the delta Scuti
J. Montalbán, Reese, Daniel, Dupret, Marc-Antoine, S. J. A. J. Salmon, Reese, D. R., Salmon, S. J. A. J., Eggenberger, P., Montalban Iglesias, Josefa, Eggenberger, Patrick, Salmon, Sébastien, M.-A. Dupret, D. R. Reese, P. Eggenberger, Montalbàn, J., Dupret, M. -A.   +14 more
core   +1 more source

Joint Long-baseline Study Based on WASP, Kepler, and TESS: Revealing the Pulsation Characteristics of δ Scuti Star KIC 8712760

The Astrophysical Journal
We report a significant nonperiodic amplitude modulation in the δ Scuti star KIC 8712760. In this study, we conduct a long-term, multimission analysis of KIC 8712760, using uniformly processed light curves from the Wide Angle Search for Planets (WASP ...
Jianwei Yao, Ali Esamdin, Haozhi Wang, Chenglong Lv, Ayzada Jumahali, Kedieryemu Kamili, Ting Wu, Rivkat Karimov, Shuhrat A. Ehgamberdiev   +8 more
doaj   +1 more source

Delta Scuti stars in stellar systems: on the variability of HD 220392 and HD 220391

, 2000
9 pages, 5 figures, accepted for publication in A& ...
Lampens, P., Van Camp, M., Sinachopoulos, D.   +2 more
openaire   +2 more sources

Asteroseismology of Triple-mode Radial δ Scuti Star: TIC 400562821

The Astrophysical Journal
We investigated the pulsating behavior of TIC 400562821 using high-precision observations from TESS. Fourier analysis of time-series data revealed three independent frequencies.
Xiao-Ya Sun, Zhao-Yu Zuo, Tao-Zhi Yang, Mariel Lares-Martiz, Zhi Li, Zhao Guo   +5 more
doaj   +1 more source

A Need to Revise Stellar Opacities from Asteroseismology of δ Scuti Stars

The Astrophysical Journal Letters, 2023
We construct seismic models of the four double-mode radial δ Scuti stars adopting opacities from three databases: OPAL, OP, and OPLIB. The aim is to find the models that fit the observed frequencies of the two radial modes and have the effective ...
Jadwiga Daszyńska-Daszkiewicz, Przemysław Walczak, Alexey Pamyatnykh, Wojciech Szewczuk, Wojciech Niewiadomski   +4 more
doaj   +1 more source

Amplitude Variability in gamma Dor and delta Scuti stars observed by the Kepler Spacecraft

, 2016
Proceedings of IAU Focus Meeting 17, Advances in Stellar Physics from Asteroseismology, XXIXth IAU General Assembly, Honolulu, Hawaii, August 2015. Focus meeting proceedings edited by C.S. Jeffery, J.A.
Guzik, Joyce A., Kosak, Katie, Bradley, Paul A., Jackiewicz, Jason   +3 more
openaire   +2 more sources

Resonant Mode Coupling in δ Scuti Stars

The Astrophysical Journal, 2023
Delta Scuti ( δ Sct) variables are intermediate-mass stars that lie at the intersection of the main sequence and the instability strip on the Hertzsprung–Russell diagram.
Mohammed Mourabit, Nevin N. Weinberg
doaj   +1 more source

MOST discovers a multimode delta Scuti star in a triple system: HD 61199 [PDF]

, 2008
Context. A field star, HD 61199 ($V \approx 8$), simultaneously observed with Procyon by the MOST (Microvariability & Oscillations of STars) satellite in continuous runs of 34, 17, and 34 days in 2004, 2005, and 2007, was found to pulsate in 11 ...
G. A. H. Walker, Hareter, Markus (Department of Astrophysics, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna), Scholtz, A., Matthews, J. M., W. W. Weiss, Sasselov, D., A. Scholtz, Kuschnig, R., R. Kuschnig, Lenz, P., S. Rucinski, Lehmann, Günther (Technische Universität Dresden), Rucinski, S., Kochukhov, Oleg (Department of Astronomy and Space Physics), Kochukhov, O.,, Huber, D., Lenz, Patrick (Department of Astrophysics, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna), O. Kochukhov, A. F. J. Moffat, D. Sasselov, Guenther, D. B., J. F. Rowe, V. Tsymbal, Rowe, J. F., H. Lehmann, J. M. Matthews, M. Hareter, Tsymbal, V., Walker, G. A. H., Hareter, M., Weiss, Werner Wolfgang (Department of Astrophysics, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna), Kochukhov, O., D. Huber, Kuschnig, Rainer (Department of Astrophysics, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna), Weiss, W. W., Moffat, A. F. J., Tsymbal, Vadim (Tavrical National University), D. B. Guenther, Lehmann, H., P. Lenz   +39 more
core   +1 more source

Modeling of Two Low-amplitude Radially Pulsating δ Scuti Stars: KIC 12602250 and KIC 5768203

The Astrophysical Journal
In this research, we conducted systematic photometric, spectroscopic, and theoretical modeling analyses of two δ Scuti stars—KIC 12602250 and KIC 5768203—that pulsate only in radial modes.
Shuguo Ma, A-Li Luo, Peng Wei, Chenglong Lv, Ming Yang, Fang Zuo, Yingzhen Cui, Shuo Li, Gang Meng, Wen Hou, Yuji He, Yinbi Li, Zhongyang Liu, Xiao-Xiao Ma, Jun-Chao Liang, Fei Dang, Daoye Yang, Ali Esamdin, Hao Zeng, Cai-Xia Qu   +19 more
doaj   +1 more source