Results 101 to 110 of about 2,783 (176)

The Rotation Properties of δ Sct and γ Dor Stars

The Astrophysical Journal
Based on the LAMOST spectroscopy and TESS time-series photometry, we have obtained a main-sequence star sample of δ Scuti and γ Doradus stars. The sample includes 1534 δ Sct stars, 367 γ Dor stars, 1703 δ Sct ∣ γ Dor stars, 270 γ Dor ∣ δ Sct stars, along
Jiyu Wang, Xiaodian Chen, Licai Deng, Jianxing Zhang, Weijia Sun   +4 more
doaj   +1 more source

Multimode δ Sct stars from the Zwicky Transient Facility Survey

The Astrophysical Journal Supplement Series
We obtain the largest catalog of multimode δ Sct stars in the northern sky to date using the Zwicky Transient Facility (ZTF) Data Release 20. The catalog includes 2254 objects, of which 2181 are new to our study.
Qi Jia, Xiaodian Chen, Shu Wang, Licai Deng, Yangping Luo, Qingquan Jiang   +5 more
doaj   +1 more source

Stellar Variability toward the Galactic Open Cluster NGC 7209

The Astrophysical Journal
We present the analysis of stellar variability in an open cluster NGC 7209 using optical V -band CCD photometric observations. Out of 4499 stars in our study, we detected 284 candidate variables, including one identified previously.
Dorothy M. Mwanzia, Sneh Lata, W. P. Chen, Soumen Mondal, Geoffrey Okeng’o, John Buers, Samrat Ghosh, Athul Dileep, Arjav Jain, Alisher S. Hojaev, Santosh Joshi   +10 more
doaj   +1 more source

Tidally Distorted Stars Are Triaxial Pulsators

The Astrophysical Journal
Stars in close binaries are tidally distorted, and this has a strong effect on their pulsation modes. We compute the mode frequencies and geometries of tidally distorted stars using perturbation theory, accounting for the effects of the Coriolis force ...
Jim Fuller, Saul Rappaport, Rahul Jayaraman, Don Kurtz, Gerald Handler   +4 more
doaj   +1 more source

Monoperiodic $\delta$ Scuti star UY Cam: an analogue of SX Phe and RR Lyr-type variables

, 2003
We present the results of a four-year photometric study of the high-amplitude $\delta$ Scuti star (HADS) UY Camelopardalis. Analyses on the available data from 1985 to 2003 show that UY Cam is monoperiodic. Fourier solutions for individual data sets do not reveal period changes in the star. Although forced parabolic fits to the $O-C$ residuals indicate
Zhou, A. -Y., Liu, Z. -L.
openaire   +2 more sources

HIP 65426 is a High-frequency Delta Scuti Pulsator in Plausible Spin–Orbit Alignment with its Directly Imaged Exoplanet

The Astronomical Journal
HIP 65426 hosts a young giant planet that has become the first exoplanet directly imaged with JWST. Using time-series photometry from the Transiting Exoplanet Survey Satellite (TESS), we classify HIP 65426 as a high-frequency δ Scuti pulsator with a ...
Aldo G. Sepulveda, Daniel Huber, Timothy R. Bedding, Daniel R. Hey, Simon J. Murphy, Zhoujian Zhang, Michael C. Liu   +6 more
doaj   +1 more source

A New Catalog of 100,000 Variable TESS A-F Stars Reveals a Correlation between δ Scuti Pulsator Fraction and Stellar Rotation

The Astrophysical Journal
δ Scuti variables are found at the intersection of the classical instability strip and the main sequence on the Hertzsprung–Russell diagram. With space-based photometry providing millions of light curves of A-F type stars, we can now probe the occurrence
Keyan Gootkin, Marc Hon, Daniel Huber, Daniel R. Hey, Timothy R. Bedding, Simon J. Murphy   +5 more
doaj   +1 more source

Short-period Variables in TESS Full-frame Image Light Curves Identified via Convolutional Neural Networks

The Astronomical Journal
The Transiting Exoplanet Survey Satellite (TESS) mission measured light from stars in ∼85% of the sky throughout its 2 yr primary mission, resulting in millions of TESS 30-minute-cadence light curves to analyze in the search for transiting exoplanets. To
Greg Olmschenk, Richard K. Barry, Stela Ishitani Silva, Jeremy D. Schnittman, Agnieszka M. Cieplak, Brian P. Powell, Ethan Kruse, Thomas Barclay, Siddhant Solanki, Bianca Ortega, John Baker, Mamani Yesenia Helem Salinas   +11 more
doaj   +1 more source

Establishing Baselines for Six Short-period δ Scuti Variables

The Astronomical Journal
As part of our variable star follow-up program, we have examined a number of stars from the Asteroid Terrestrial-impact Last Alert System (ATLAS) survey. Using a combination of our own data, ATLAS data, and other archival data, we confirmed the published
Christiana Z. Suggs, Eric G. Hintz, Denise C. Stephens   +2 more
doaj   +1 more source

A Search of Periodic Variable Stars in the LMC by JWST Photometry

The Astrophysical Journal Supplement Series
Based on high-resolution near-infrared photometric data from the James Webb Space Telescope (JWST) targeting the Large Magellanic Cloud, this study attempts to evaluate the feasibility and sensitivity limits of variable star detection in crowded stellar ...
Jiyu Wang, Xiaodian Chen, Jianxing Zhang, Ziming Yan, Shu Wang, Licai Deng   +5 more
doaj   +1 more source