Results 91 to 100 of about 1,219 (138)

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

Position and Time Determination Without Prior State Knowledge via Onboard Optical Observations of Delta Scuti Variable Stars

The Journal of the Astronautical Sciences
We present a navigation concept for solving the lost in space and time problem using optical observations of $δ$ Scuti variable stars. Only a small number of techniques exist that allow a spacecraft to recover from being lost in both space and time, which can be caused by a failure of the onboard clock and navigation systems. Optical observations of $δ$
Linyi Hou, Ishaan Bansal, Clark Davis, Siegfried Eggl   +3 more
openaire   +2 more sources

Precise Parameter Determination of the Open Cluster NGC 1647 via Asteroseismology of p-mode Pulsators

The Astrophysical Journal
Asteroseismology of member pulsators provides a robust physical constraint on cluster parameters by linking internal stellar structures to the global properties of the host cluster.
Mingfeng Qin, Jian-Ning Fu, Weikai Zong, Tianqi Cang, Antonio Frasca, Gang Meng, Xiran Xie   +6 more
doaj   +1 more source

Discovery and Characterization of Three New High-amplitude δ Scuti Stars from TESS Observations

The Astrophysical Journal
We report the discovery and detailed analysis of three new high-amplitude δ Scuti (HADS) stars, TIC 408074920, TIC 189714989, and TIC 34137913, identified from Transiting Exoplanet Survey Satellite short-cadence observations.
Chenglong Lv, Ali Esamdin, J. Pascual-Granado, Guojie Feng, Haozhi Wang, Rivkat Karimov, Bolkin Juraev, Shuhrat A. Ehgamberdiev   +7 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

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

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

Variability of the Delta Scuti Stars

The Astrophysical Journal, 1967
Kam-Ching Leung, William Wehlau
openaire   +1 more source