Results 31 to 40 of about 14,588 (266)

A Mini-Review of Accreting Pulsating White Dwarfs

Frontiers in Astronomy and Space Sciences, 2021
The discovery in 1998 of a pulsating white dwarf in the cataclysmic variable GW Lib opened up a new avenue of exploration in the asteroseismology of white dwarfs.
Paula Szkody
doaj   +1 more source

Constraining equation of state groups from $g$-mode asteroseismology [PDF]

, 2022
Buoyancy-restored modes inside neutron stars depend sensitively on both the microphysical (e.g., composition and entropy gradients) and macrophysical (e.g., stellar mass and radius) properties of the star.
Hao-Jui Kuan, Christian J. Kruger, A. Suvorov, K. Kokkotas   +3 more
semanticscholar   +1 more source

Asteroseismology of the double-radial mode δ Scuti star BP Pegasi [PDF]

Monthly notices of the Royal Astronomical Society, 2022
Using the ASAS data, we determine the pulsational frequencies of the high-amplitude δ Sct star BP Pegasi. The analysis revealed only the two known, independent frequencies that we use to perform the seismic analysis of the star.
J. Daszyńska-Daszkiewicz, P. Walczak, A. Pamyatnykh, W. Szewczuk   +3 more
semanticscholar   +1 more source

A 20 Second Cadence View of Solar-type Stars and Their Planets with TESS: Asteroseismology of Solar Analogs and a Recharacterization of π Men c [PDF]

Astronomical Journal, 2021
We present an analysis of the first 20 second cadence light curves obtained by the TESS space telescope during its extended mission. We find improved precision of 20 second data compared to 2 minute data for bright stars when binned to the same cadence (≈
D. Huber, T. White, T. Metcalfe, A. Chontos, M. Fausnaugh, C. Ho, V. V. Eylen, W. Ball, S. Basu, T. Bedding, O. Benomar, D. Bossini, S. Breton, D. Buzasi, T. Campante, W. Chaplin, J. Christensen-Dalsgaard, M. Cunha, M. Deal, R. García, A. G. Muñoz, Charlotte Gehan, L. González-Cuesta, Chen Jiang, C. Kayhan, H. Kjeldsen, M. Lundkvist, S. Mathis, S. Mathur, M. Monteiro, B. Nsamba, J. Ong, E. Pakštienė, A. Serenelli, V. S. Aguirre, K. Stassun, D. Stello, Sissel Norgaard Stilling, M. Winther, Tao Wu, T. Barclay, T. Daylan, M. N. Guenther, J. Hermes, J. Jenkins, D. Latham, A. Levine, G. Ricker, S. Seager, Avi Shporer, J. Twicken, R. Vanderspek, J. Winn   +52 more
semanticscholar   +1 more source

Equatorially trapped Rossby waves in radiative stars

Astronomische Nachrichten, Volume 344, Issue 10, December 2023., 2023
Abstract Observations by recent space missions reported the detection of Rossby waves (r‐modes) in light curves of many stars (mostly A, B, and F spectral types) with outer radiative envelope. This article aims to study the theoretical dynamics of Rossby‐type waves in such stars. Hydrodynamic equations in a rotating frame were split into horizontal and
Mariam Albekioni, Teimuraz V. Zaqarashvili, Vasil Kukhianidze, Eka Gurgenashvili, Philippe Bourdin   +4 more
wiley   +1 more source

Highlights of Discoveries for δ Scuti Variable Stars From the Kepler Era

Frontiers in Astronomy and Space Sciences, 2021
The NASA Kepler and follow-on K2 mission (2009–2018) left a legacy of data and discoveries, finding thousands of exoplanets, and also obtaining high-precision long time-series data for hundreds of thousands of stars, including many types of pulsating ...
Joyce Ann Guzik
doaj   +1 more source

FRA–A new fast, robust, and automated pipeline for the detection and measurement of solar‐like oscillations in time‐series photometry of red‐giant stars

Astronomische Nachrichten, Volume 344, Issue 5, June 2023., 2023
Abstract We developed, tested, and validated a new Fast, Robust, and Automated (FRA) tool to detect solar‐like oscillations. FRA is based on the detection and measurement of the frequency of maximum oscillation power νmax$$ {\nu}_{\mathrm{max}} $$, without relying on the detection of a regular frequency spacing to guide the search.
Charlotte Gehan, T. L. Campante, M. S. Cunha, F. Pereira   +3 more
wiley   +1 more source

Mixed-mode Asteroseismology of Red Giant Stars Through the Luminosity Bump [PDF]

Astrophysical Journal, 2022
Most current models of low-mass red giant stars do not reproduce the observed position of the red giant branch luminosity bump, a diagnostic of the maximum extent of the convective envelope during the first dredge up. Global asteroseismic parameters, the
C. Lindsay, J. Ong, S. Basu
semanticscholar   +1 more source

On the application of machine learning in astronomy and astrophysics: A text‐mining‐based scientometric analysis

WIREs Data Mining and Knowledge Discovery, Volume 12, Issue 5, September/October 2022., 2022
This work presents a text‐mining‐based scientometric analysis of the scientific output in the last three decades regarding the use of artificial intelligence and machine learning in the fields of astronomy and astrophysics. Abstract Since the beginning of the 21st century, the fields of astronomy and astrophysics have experienced significant growth at ...
José‐Víctor Rodríguez, Ignacio Rodríguez‐Rodríguez, Wai Lok Woo   +2 more
wiley   +1 more source

The potential of Shannon entropy to find the large separation of δ Scuti stars: The entropy spectrum

Frontiers in Astronomy and Space Sciences, 2022
This study explores the use of Shannon entropy to find periodic patterns in the oscillation spectra of δ Scuti stars. We have developed a new diagnostic tool for detecting potential patterns that scans for minimal entropic states in the well-known ...
J. C. Suárez
doaj   +1 more source