Results 51 to 60 of about 837,700 (191)
An optimized Hβ index for disentangling stellar population ages [PDF]
Monthly Notices of the Royal Astronomical Society, 2009 We have defined a new H_βabsorption index definition, H$_{β_o}$, which has been optimized as an age indicator for old and intermediate age stellar populations. Rather than using stellar spectra, we employed for this purpose a library of stellar population SEDs of different ages and metallicities at moderately high spectral resolution.
Cervantes, J. L., Vazdekis, A.
openaire +2 more sources
The Astrophysical Journal Supplement SeriesStellar age determination for large samples of stars opens new avenues for a broad range of astronomical sciences. While precise stellar ages for evolved stars have been derived from large ground- and space-based stellar surveys, reliable age ...
Jia-Hui Wang +7 more
doaj +1 more source
Three-dimensional Simulations of Massive Stars. II. Age Dependence
The Astrophysical Journal, 2023 We present 3D full star simulations, reaching up to 90% of the total stellar radius, for three 7 M _⊙ stars of different ages: zero-age main sequence (ZAMS), mid–main sequence (midMS), and terminal-age main sequence (TAMS).
R. Vanon +4 more
doaj +1 more source
Bayesian isochrone fitting and stellar ages
, 2014 Stellar evolution theory has been extraordinarily successful at explaining the different phases under which stars form, evolve and die. While the strongest constraints have traditionally come from binary stars, the advent of asteroseismology is bringing ...
D. Valls-Gabaud
core +1 more source
cx2204/stellar-radius: stellar radius microphysics
, 2022 Full Changelog: https://github.com/cx2204/stellar-radius/commits/v1.
cx2204
core +1 more source
ChronoFlow: A Data-driven Model for Gyrochronology
The Astrophysical JournalGyrochronology is a technique for constraining stellar ages using rotation periods, which change over a star’s main-sequence (MS) lifetime due to magnetic braking. This technique shows promise for MS FGKM stars, where other methods are imprecise. However,
Phil R. Van-Lane +7 more
doaj +1 more source
The nature and origin of disky elliptical galaxies [PDF]
, 2002 The observational trend that disky elliptical galaxies exhibit younger luminosity- weighted ages than boxy ellipticals is investigated. The presence of a possible young stellar disk embedded in these galaxies is explored by comparing kinematics derived ...
McDermid, Richard Morgan
core
Stellar age determination using deep neural networks
Astronomy & AstrophysicsContext. Recent spectroscopic surveys provide element abundances for large samples of Milky Way stars, from which stellar parameters can be inferred.
Boin T. +6 more
doaj +1 more source
Homogeneous spectroscopic parameters for bright planet host stars from the northern hemisphere. The impact on stellar and planetary mass [PDF]
, 2015 This work is supported by the European Research Council/European Community under the FP7 through Starting Grant agreement number 239953. N.C.S. was supported by FCT through the Investigador FCT contract reference IF/00169/2012 and POPH/FSE (EC) by FEDER ...
Mortier, Annelies +18 more
core +1 more source
Using Gravity as an Age Indicator for Young Stars
The Astrophysical Journal LettersThe age of a young star is difficult to measure and yet is a fundamental property that is essential for understanding stellar evolution. Accurate age indicators across the early phases of low-mass stars are scarce and often rely on properties of the ...
Michael Connelley +2 more
doaj +1 more source