Results 21 to 30 of about 2,111 (247)
Luminosity variation in the extended one-zone RR Lyrae model [PDF]
Serbian Astronomical Journal, 2005 The Stellingwerf one-zone stellar model is extended by assuming, a slow and uniform rotation that leads to a very small oblateness of the star. The matter in the core-surrounding shell is supposed to consists of a mixture of ideal gas and radiation. This
Pricopi D.
doaj +1 more source
Double-Mode Stellar Pulsation [PDF]
International Astronomical Union Colloquium, 1993 AbstractThe current observational and theoretical status of the double-mode variables is reviewed. Focusing mostly on the RR Lyrae stars, we address the question of the observational evidence of modal stability. The problem of stationarity is a crucial issue in the modelling of these stars.We mention past efforts in hydrodynamical and analytical ...
openaire +1 more source
Spectro-Photo-Interferometry of Stellar Pulsation (SPIPS)
EPJ Web of Conferences, 2017 We present our implementation of the parallax of pulsation method which integrates all observables and physical modelling of the photosphere to get the best statistical precision and controlled biases.
Mérand Antoine +5 more
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Black Hole Mergers and Their Electromagnetic Counterparts [PDF]
, 2011 Over the past ten years it has become increasingly clear that most, if not all, galaxies have super-massive black holes lurking in their cores. The implications for this are large as they not only have significant effects on the host galaxies, far beyond
Bode, Jason Nathaniel
core +1 more source
The imprint of star formation on stellar pulsations
Nature Communications, 2022 AbstractIn the earliest phases of their evolution, stars gain mass through the acquisition of matter from their birth clouds. The widely accepted classical concept of early stellar evolution neglects the details of this accretion phase and assumes the formation of stars with large initial radii that contract gravitationally. In this picture, the common
Steindl, Thomas +2 more
openaire +7 more sources
Pulsation-induced Spectroscopic Variability of IRAS Z02229+6208
The Astrophysical Journal, 2023 Monitoring of high-resolution spectra in the optical and near-infrared wavelength region was carried out for the early post-AGB stage star IRAS Z02229+6208 with the CARMENES instrument to reveal spectroscopic variability over the pulsation cycle of 154 ...
Laimons Začs, Kārlis Puķı̄tis
doaj +1 more source
Challenges in 2D Stellar Modeling
Frontiers in Astronomy and Space Sciences, 2020 Traditionally, stellar structure and evolution have been modeled with a series of concentric spherical shells. This description allows the star to be modeled in 1 dimension, greatly simplifying the calculations.
Catherine C. Lovekin
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The Astrophysical Journal, 2023 AllS single stars that are born with masses up to 8.5–10 M _⊙ will end their lives as white dwarf (WD) stars. In this evolutionary stage, WDs enter the cooling sequence, where the stars radiate away their thermal energy and are basically cooling.
Weston Hall +2 more
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The Pre-main Sequence: Challenges and Prospects for Asteroseismology
Frontiers in Astronomy and Space Sciences, 2022 Stars do not simply pop up on the main sequence. Before the stars arrive on the zero-age main sequence, they form in the collapses of molecular clouds, gain matter through accretion processes, and compress their cores until hydrogen can burn in full ...
Konstanze Zwintz, Thomas Steindl
doaj +1 more source
Stellar pulsations excited by a scattered mass [PDF]
Physical Review D, 1999 23 pages, 6 figures ...
FERRARI, Valeria +2 more
openaire +4 more sources