Wavelets: a powerful tool for studying rotation, activity, and pulsation in Kepler and CoRoT stellar light curves [PDF]
, 2014 Aims. The wavelet transform has been used as a powerful tool for treating several problems in astrophysics. In this work, we show that the time-frequency analysis of stellar light curves using the wavelet transform is a practical tool for identifying ...
J. P. Bravo +4 more
semanticscholar +1 more source
A NEW GENERATION OF PARSEC-COLIBRI STELLAR ISOCHRONES INCLUDING THE TP-AGB PHASE [PDF]
, 2017 We introduce a new generation of PARSEC–COLIBRI stellar isochrones that includes a detailed treatment of the thermally pulsing asymptotic giant branch (TP-AGB) phase, covering a wide range of initial metallicities (0.0001 < Zi < 0.06).
P. Marigo +15 more
semanticscholar +1 more source
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
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
DIRECT DIAGNOSTICS OF FORMING MASSIVE STARS: STELLAR PULSATION AND PERIODIC VARIABILITY OF MASER SOURCES [PDF]
, 2013 The 6.7 GHz methanol maser emission, a tracer of forming massive stars, sometimes shows enigmatic periodic flux variations over several 10–100 days. In this Letter, we propose that these periodic variations could be explained by the pulsation of massive ...
K. Inayoshi +4 more
semanticscholar +1 more source
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
Stable higher order finite-difference schemes for stellar pulsation calculations [PDF]
, 2013 Context: Calculating stellar pulsations requires a sufficient accuracy to match the quality of the observations. Many current pulsation codes apply a second order finite-difference scheme, combined with Richardson extrapolation to reach fourth order ...
D. Reese
semanticscholar +1 more source
RADIAL STELLAR PULSATION AND THREE-DIMENSIONAL CONVECTION. II. TWO-DIMENSIONAL CONVECTION IN FULL AMPLITUDE RADIAL PULSATION [PDF]
, 2013 We have developed a three-dimensional radiation hydrodynamics code to simulate the interaction of convection and radial pulsation in classical variable stars.
C. Geroux, R. Deupree
semanticscholar +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
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
doaj +1 more source