Results 71 to 80 of about 1,219 (138)

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

Variable stars in the globular cluster NGC 3201. I. Multimode SX Phe-type variables

, 2003
We report on the discovery of eleven multimode SX Phoenicis--type blue stragglers in the field of the southern globular cluster NGC 3201. In these variables both radial and non-radial modes are excited.
Krzeminski, W., Mazur, B., Thompson, I. B.   +2 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

Modelling of the fast rotating delta Scuti star Altair

, 2005
We present an asteroseismic study of the fast rotating star HD187642 (Altair), recently discovered to be a delta Scuti pulsator. We have computed models taking into account rotation for increasing rotational velocities.
Bruntt, H., Buzasi, D., Suarez, J. C.
core   +1 more source

The Identification of RR Lyrae and Delta Scuti Stars from Variable GALEX Ultraviolet Sources

, 2014
We identify the RR Lyrae and delta Scuti (DSCT) stars in three catalogs of GALEX variable sources. The NUV amplitude of RR Lyrae stars is about twice that in V-band, so we find a larger percentage of low amplitude variables than catalogs such as Abbas et al (2014).
Kinman, T. D., Brown, Warren R.
openaire   +2 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

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

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

PLoS One, 2021
Muñoz V, Garcés NE.
europepmc   +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

Ensemble Machine Learning Approach to Estimate the Asteroseismic Indices for δ Scuti Stars Observed by TESS

The Astronomical Journal
We develop an ensemble machine learning framework to estimate key asteroseismic parameters—namely the frequency of the highest peak ( ν ( A _max )), the frequency of maximum oscillation power ( ν _max ), and the large frequency separation (Δ ν )—directly
Akram Bolouki, Amir Hasanzadeh, Hossein Safari   +2 more
doaj   +1 more source