Results 1 to 10 of about 37 (36)
The Directly Imaged Exoplanet Host Star 51 Eridani is a Gamma Doradus Pulsator
The Astrophysical Journal, 2022 51 Eri is well known for hosting a directly imaged giant planet and for its membership to the β Pictoris moving group. Using 2 minute cadence photometry from the Transiting Exoplanet Survey Satellite (TESS), we detect multiperiodic variability in 51 Eri ...
Aldo G. Sepulveda +5 more
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Variable Blue Straggler Stars in the Open Cluster NGC 6819 Observed in the Kepler “Superstamp” Field
The Astronomical Journal, 2023 NGC 6819 is an open cluster of age 2.4 Gyr that was in the NASA Kepler spacecraft’s field of view from 2009 to 2013. The central part of the cluster was observed in a 200 × 200 pixel “superstamp” during these four years in 30 minute cadence photometry ...
Joyce A. Guzik +6 more
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The Astrophysical JournalBased 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 +3 more
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KIC 6362386: An Eclipsing Binary with γ Doradus–type Pulsations and Starspots
The Astronomical JournalKIC 6362386 is an eclipsing binary system that exhibits both γ Doradus ( γ Dor)–type pulsations and starspots. In this study, we investigated this binary system using the Kepler photometry and the spectroscopic data from the Large Sky Area Multi-Object ...
Mengqi Jin +7 more
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The Rotation Properties of δ Sct and γ Dor Stars
The Astrophysical JournalBased 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 +4 more
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Stellar Variability toward the Galactic Open Cluster NGC 7209
The Astrophysical JournalWe 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 +10 more
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TIC 322208686: An Eclipsing System with γ Doradus Pulsations and a Third Component on a Wider Orbit
The Astronomical JournalTIC 322208686 is known to be a detached binary that exhibits two types of variability: pulsation and eclipse. We present the physical properties of the target star using the short-cadence TESS data from sectors 24, 57, and 58, and our echelle spectra ...
Jae Woo Lee +5 more
doaj +1 more source
The Pre-He White Dwarfs in Eclipsing Binaries. V. TIC 399725538
The Astronomical JournalWe present echelle spectra of TIC 399725538 obtained in Korea and Thailand to investigate the physical properties and evolutionary scenarios of EL CVn-type binaries. The time-series spectra yielded the radial velocities (RVs) of the primary component and
Jae Woo Lee +4 more
doaj +1 more source
The Double-lined Eclipsing γ Doradus System AX Draconis in a 0.568 day Orbit
The Astronomical JournalFor the near-contact binary AX Dra, we present the first time-series spectroscopy collected with the echelle spectrograph BOES. From spectral analysis, we measured the projected rotation of ${v}_{1}\sin i$ = 120 ± 21 km s ^−1 and effective temperature of
Jae Woo Lee +5 more
doaj +1 more source
Cosmic-Ray Propagation in Light of the Recent Observation of Geminga. [PDF]
Astrophys J, 2019 Jóhannesson G +2 more
europepmc +1 more source