Results 61 to 70 of about 1,219 (138)

LASR-Guided Stellar Photometric Variability Subtraction: The Linear Algorithm For Significance Reduction

, 2018
We develop a technique for removing stellar variability in the light curves of $\delta$-Scuti and similar stars. Our technique, which we name the Linear Algorithm for Significance Reduction (LASR), subtracts oscillations from a time series by minimizing ...
Ahlers, John P., Barnes, Jason W., Hedman, Matthew M., Horvath, Sarah A., Myers, Samuel A.   +4 more
core   +1 more source

A Need to Revise Stellar Opacities from Asteroseismology of δ Scuti Stars

The Astrophysical Journal Letters, 2023
We construct seismic models of the four double-mode radial δ Scuti stars adopting opacities from three databases: OPAL, OP, and OPLIB. The aim is to find the models that fit the observed frequencies of the two radial modes and have the effective ...
Jadwiga Daszyńska-Daszkiewicz, Przemysław Walczak, Alexey Pamyatnykh, Wojciech Szewczuk, Wojciech Niewiadomski   +4 more
doaj   +1 more source

Variability of Young Massive Stars in the Galactic Super Star Cluster Westerlund 1

, 2007
This paper presents the first optical variability study of the Westerlund 1 super star cluster in search of massive eclipsing binary systems. A total of 129 new variable stars have been identified, including the discovery of 4 eclipsing binaries that are
Alceste Z. Bonanos, Rauw G., Schweickhardt J., Townsend R. H. D., Westerlund B. E.   +4 more
core   +3 more sources

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

Resonant Mode Coupling in δ Scuti Stars

The Astrophysical Journal, 2023
Delta Scuti ( δ Sct) variables are intermediate-mass stars that lie at the intersection of the main sequence and the instability strip on the Hertzsprung–Russell diagram.
Mohammed Mourabit, Nevin N. Weinberg
doaj   +1 more source

Constraining the properties of delta Scuti stars using spectroscopic eclipsing binary systems

, 2011
Many stars exhibit stellar pulsations, favoring them for asteroseismic analyses. Interpreting the oscillations requires some knowledge of the oscillation mode geometry (spherical degree, radial and azimuthal orders).
Aerts, Baglin, Borucki, Breger, Brown, Burke, Bíró, Böhm-Vitense, Creevey, Creevey, Creevey, Creevey, Daszynska-Daszkiewicz, Eggleton, Featherstone, Gamarova, Garrido, Gough, Guzik, Hadrava, Handler, Hekker, Henry, Horner, J. A. Belmonte, Kennelly, Lampens, Lastennet, Maceroni, Maceroni, MacGregor, Matthews, Metcalfe, Metcalfe, O. L. Creevey, Pamyatnykh, Press, Ribas, S. Jiménez-Reyes, Semeniuk, Southworth, Stello, T. M. Brown, T. S. Metcalfe, Talamantes, Templeton, Viskum, York   +47 more
core   +1 more source

Asteroseismology of Triple-mode Radial δ Scuti Star: TIC 400562821

The Astrophysical Journal
We investigated the pulsating behavior of TIC 400562821 using high-precision observations from TESS. Fourier analysis of time-series data revealed three independent frequencies.
Xiao-Ya Sun, Zhao-Yu Zuo, Tao-Zhi Yang, Mariel Lares-Martiz, Zhi Li, Zhao Guo   +5 more
doaj   +1 more source

The pulsation spectrum of VX Hydrae

, 2009
We present the results of a two-year, multisite observing campaign investigating the high-amplitude delta Scuti star VX Hydrae during the 2006 and 2007 observing seasons. The final data set consists of nearly 8500 V-band observations spanning HJD 2453763.
Butterworth, N., Dvorak, S., Gerner, H., Poklar, R., Samolyk, G., Templeton, M. R.   +5 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

CCD Photometry of Delta Scuti stars 7 Aql and 8 Aql

, 2008
As a continuation of the study of the Delta Scuti stars 7 Aql and 8 Aql; new CCD photometric data were acquired in 2007. We present a period analysis on these data that confirm the dominant modes detected in each star in the framework of the STEPHI XII ...
Alvarez, M., Castro, A., Machado, L. Fox, Michel, R., Parrao, L., Pena, J. H.   +5 more
core   +1 more source