Results 61 to 70 of about 2,888,460 (154)

A study of the stellar photosphere-hydrogen ionization front interaction in $\delta$ Scuti stars [PDF]

, 2023
Pulsating variable $\delta$ Scuti stars are intermediate-mass stars with masses in the range of $1-3$ $M_{\odot}$ and spectral types between $A2$ and $F2$.
Deb, Sukanta, Das, Susmita, Deka, Mami, Kanbur, Shashi M.   +3 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

The connection between Delta Scuti stars and close binary parameters

, 2011
With recent advances in CCD technology, it has become possible to detect low-amplitude variability in stars. Thus, the number of low-amplitude variables has increased at an exceptional rate over the past decade.
Turner, Garrison H.
core  

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

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

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

Pulsation models of selected Delta Scuti stars [PDF]

, 2009
Delta Scuti Sterne sind pulsierende Sterne, die sowohl radiale Schwingungsmoden als auch nicht-radiale Druck- und Schwerkraftmoden aufweisen. Der Hauptaspekt dieser Arbeit ist die Bestimmung der Geometrie der Schwingungsmoden (Modenidentifikation) und ...
Lenz, Patrick
core  

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

Pulsation Mode Identification and Classification of 46 High-amplitude δ Scuti Stars from 50 Candidates with TESS Observations

The Astrophysical Journal
Asteroseismic modeling of high-amplitude δ Scuti (HADS) variables critically depends on their accurate classification, which provides robust constraints on stellar physical parameters.
Taozhi Yang, Zhaoyu Zuo
doaj   +1 more source

Analysis of pulsating variable stars using the visibility graph algorithm. [PDF]

PLoS One, 2021
Muñoz V, Garcés NE.
europepmc   +1 more source