Results 31 to 40 of about 1,014 (294)
Chaotic Pulsations in Variable Stars with Harmonic Mode Coupling [PDF]
, 1991 Some variable stars show multi-periodic behaviour with, among others, peaks in their power spectra at harmonically spaced frequencies with ratios 1:2:4. Such modes are nonlinearly coupled by two second-harmonic interactions and their amplitude equations are shown by a Painlevé analysis to be nonintegrable in a hamiltonian sense.
Verheest, Frank, Hereman, Willy
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Pulsating B and Be stars in the Small Magellanic Cloud [PDF]
, 2008 Context. Stellar pulsations in main-sequence B-type stars are driven by the κ-mechanism due to the Fe-group opacity bump. The current models do not predict the presence of instability strips in the B spectral domain at very low metallicities.
Diago, Pascual +11 more
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Uncorrelated Amplitude and Frequency Variations of the Harmonics in SX Phoenicis Star XX Cygni
The Astronomical Journal, 2023 Harmonics are quite common in pulsating stars. They are always considered to mimic the behaviors of their independent parent pulsation modes, and are not taken for key information in asteroseismology.
Jia-Shu Niu, Yue Liu, Hui-Fang Xue
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HISTOGRAMS OF PERIODS DISTRIBUTION AND MODE IDENTIFICATIONS OF RRc LYR STARS
Odessa Astronomical Publications, 2017 On the base of GCVS (General Catalogue of Variable Stars) sampling (381 stars with the known periods) has been carried out the analysis of periods of RRc Lyr stars.
V. P. Bezdenezhnyi
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Pulsating variable stars in the Magellanic Clouds [PDF]
Proceedings of the International Astronomical Union, 2008 AbstractPulsating variable stars can be powerful tools to study the structure, formation and evolution of galaxies. I discuss the role that the Magellanic Clouds' pulsating variables play in our understanding of the whole Magellanic System, in light of results on pulsating variables produced by extensive observing campaigns like the MACHO and OGLE ...
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The AAVSO and its Variable Star Databank on Pulsating Stars [PDF]
International Astronomical Union Colloquium, 1995 AbstractThe American Association of Variable Stars Observers is the world’s largest organization of variable star observers. Its services to the astronomical community and database on pulsating variables are described.
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Pulsation among TESS A and B stars and the Maia variables [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT Classification of over 50 000 TESS stars in sectors 1–18 has resulted in the detection of 766 pulsating main-sequence B stars as well as over 5000 δ Scuti, 2300 γ Doradus, and 114 roAp candidates. Whereas it has been assumed that high-frequency pulsations among B-type main-sequence stars are confined to the early B-type β Cephei
L A Balona, D Ozuyar
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A Rapidly Evolving High-amplitude δ Scuti Star Crossing the Hertzsprung Gap
The Astrophysical Journal Letters, 2022 In this work, we report the discovery of the rapidly evolving high-amplitude δ Scuti star KIC 6382916 (J19480292+4146558), which is crossing the Hertzsprung gap.
Jia-Shu Niu, Hui-Fang Xue
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Pulsations and Hydrodynamics of Luminous Blue Variable Stars [PDF]
Astronomical Review, 2012 The Luminous Blue Variable stars exhibit behavior ranging from light curve `microvariations' on timescales of tens of days, to `outbursts' accompanied by mass loss of up to 10e-03 solar masses per year, occurring decades apart, to `giant eruptions' such as seen in Eta Carinae ejecting one or more solar masses and recurring on timescales of centuries ...
Guzik, Joyce A., Lovekin, Catherine C.
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White-Dwarf Asteroseismology With the Kepler Space Telescope
Frontiers in Astronomy and Space Sciences, 2020 In the course of their evolution, white-dwarf stars go through at least one phase of variability in which the global pulsations they undergo allow astronomers to peer into their interiors, making it possible to shed light on their deep inner structure ...
Alejandro H. Córsico +1 more
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