Results 71 to 80 of about 224 (157)

Two High-amplitude δ Scuti–γ Doradus Hybrids Constrained by the Radial Fundamental p and Equally Spaced g Modes

The Astrophysical Journal
Based on 2 minutes cadence TESS data, we investigate pulsations of TIC 65138566 and TIC 139729335 and discover them to be two new high-amplitude δ Scuti stars with equally spaced g modes.
Xinghao Chen, Xiaobin Zhang, Yan Li, Jie Su   +3 more
doaj   +1 more source

A search for delta Scuti stars in northern open clusters [PDF]

, 2007
. In an effort to test stellar structure and evolution models, analysis of oscillations in A and F stars in open clusters is carried out by the STACC network (Frandsen 1992).
M. Viskum, S. Frandsen, Ccd Photometry
core  

Equidistant frequency triplets in pulsating stars: The Combination Mode Hypothesis [PDF]

, 2006
Multiplet structures are a common feature in pulsating stars, and can be the consequence of rotational splitting, mode interaction or sinusoidal amplitude variations.
Breger, M., Kolenberg, Katrien (Department of Astrophysics, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna), M. Breger, Kolenberg, K., K. Kolenberg, Breger, Michel (Department of Astrophysics, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna)   +5 more
core   +1 more source

KIC 3868420: A High-amplitude δ Scuti–γ Dor Hybrid Star Crossing the Hertzsprung Gap

The Astrophysical Journal
We report a photometric and asteroseismic analysis of KIC 3868420, a newly identified high-amplitude δ Scuti– γ Doradus hybrid star located in the Hertzsprung gap—a short-lived and rarely observed post-main-sequence phase.
Tao-Zhi Yang, Zhao-Yu Zuo
doaj   +1 more source

Population of the lower part of the instability strip: Delta Scuti stars and dwarf Cepheids (or AI Velorum) [PDF]

, 1980
Some of the properties of the atmospheric variations in delta Scuti stars were investigated with emphasis on the amplitude and the shape of both light curves and radial velocity curves.
Lecontel, J. M., Valtier, J. C., Baglin, A., Auvergne, M.   +3 more
core   +1 more source

Hilbert Transform Reveals Unusual Modulation in Delta Scuti Star KIC 10407873

The Astrophysical Journal
We report a δ Scuti star, KIC 10407873, exhibiting significant amplitude modulation. Fourier analysis of Kepler long-cadence data (i.e., Q0-Q17, spanning 1471 days) reveals two distinct features: harmonic series of frequencies in the low-frequency region
Haozhi Wang, Ali Esamdin, Chenglong Lv, Lixian Shen, Rivkat Karimov, Shuhrat A. Ehgamberdiev   +5 more
doaj   +1 more source

Hybrid γ Doradus-δ Scuti Pulsators: New Insights into the Physics of the Oscilations from Kepler Observations [PDF]

Observations of the pulsations of stars can be used to infer their interior structure and test theoretical models. The main-sequence gamma Doradus (Dor) and delta Scuti (Sct) stars with masses 1.2-2.5 M(circle dot) are particularly useful for these ...
Martín-Ruíz, S., Moya Bedón, Andrés, Ventura, R., Moya, A, Grigahcène, A., Suárez, J. C.   +5 more
core   +3 more sources

Signature of High-amplitude Pulsations in Seven δ Sct Stars via TESS Observations

The Astrophysical Journal
The regular behavior of the pulsations of high-amplitude δ Sct (HADS) stars gives a greater chance to investigate the interiors of stars. We analyzed seven HADS stars showing peak-to-peak amplitudes of more than 0.3 mag that were newly observed by TESS ...
Fatemeh Vasigh, Elham Ziaali, Hossein Safari   +2 more
doaj   +1 more source

The TAOS Project Stellar Variability I. Detection of Low-Amplitude delta Scuti Stars

, 2009
Accepted for publication in ...
Kim, D. -W., Protopapas, P., Alcock, C., Byun, Y. -I., Kyeong, J., Lee, B. -C., Wright, N. J., Axelrod, T., Bianco, F. B., Chen, W. -P., Coehlo, N. K., Cook, K. H., Dave, R., King, S. -K., Lee, T., Lehner, M. J., Lin, H. -C., Marshall, S. L., Porrata, R., Rice, J. A., Schwamb, M. E., Wang, J. -H., Wang, S. -Y., Wen, C. -Y., Zhang, Z. -W.   +24 more
openaire   +2 more sources

Search for exoplanets through pulsation timing of Delta Scuti stars in the first Plato field. [PDF]

openThe PLATO mission to be launched in 2026 by ESA is a curial mission for the development of Exoplanetary studies. Prior study of the list of candidate stars are important to identify the most important field of view to be selected. Out of many methods
BOSE, UTSAV
core