Results 261 to 270 of about 69,893 (289)

An Abrupt Change in the Disk Fraction of Free-Floating Planets at the Deuterium-Burning Ignition Limit

Rodrigues T, Bouy H, Raymond S, Martín E, Bertin E, Romero JO, Barrado D, Huélamo N, Tamura M, Roig NM, Galli P, Cuillandre J.   +11 more
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Stellar Evolutionary Models: current uncertainties

AIP Conference Proceedings, 2009
In this last decade, our knowledge of evolutionary and structural properties of stars of different mass and chemical composition is significantly improved. This result has been achieved as a consequence of our improved capability in understanding and describing the physical behavior of stellar matter in the thermal regimes characteristic of the ...
Santi Cassisi, Giuliana Giobbi, Amedeo Tornambe, Gabriella Raimondo, Marco Limongi, L. A. Antonelli, Nicola Menci, Enzo Brocato   +7 more
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Test of evolutionary models for stellar population studies

Journal of Astrophysics and Astronomy, 1994
Using the Andersen (1991) data on the mass, absolute visual magnitude, the effective surface temperature and the bolometric corrections, new calibrations for the mass vs. absolute visual magnitude and for the bolometric correction vs. effective surface temperature have been derived.
N. Srivastva, R. K. Gulati, N. C. Rana
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AGB star atmospheres modeling as feedback to stellar evolutionary and galaxy models

Proceedings of the International Astronomical Union, 2018
AbstractThe chemical enrichment of the Universe is considerably affected by the contribution of cool evolved stars. We studied the O-rich star R Peg and the C-rich star V Oph, using respectively the VLTI/GRAVITY and VLTI/MIDI instruments. We interpret the data using grids of 1-D and 3-D dynamic model atmospheres.
Gioia Rau, M. Wittkowski, A. Chiavassa, K. Carpenter, K. Nielsen, V. S. Airapetian   +5 more
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An improved evolutionary model for stellar population applied to NGC 2903

Astrophysics and Space Science, 1990
We outline the revised physical assumption which have been incorporated into our previously published evolutionary model for stellar population synthesis in galaxies. Applying the present version of the model to well-defined zones on the nucleus and along a spiral arm of NGC 2903 we show that the star formation rate has increased during the lifetime of
E. Casuso, J. E. Beckman, J. Cepa
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Evolutionary stellar models including diffusion and radiative accelerations

EAS Publications Series, 2005
Atomic diffusion has been suggested to play a significant role in a large variety of CP stars to reproduce observations. In this paper I will briefly present the physics included in the self-consistent models that include atomic diffusion and radiative accelerations.
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Detached Eclipsing Binaries as a Test of Stellar Evolutionary Models

2000
A comparison between the observations and the predictions of standard models and overshooting models (α ov=0.2) is presented in this communication. For this purpose, we built an interpolation algorithm that uses as input data a sample of detached double-lined eclipsing binaries with accurate masses and radii.
Ignasi Ribas, Carme Jordi, Álvaro Giménez   +2 more
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Application of a new evolutionary model for stellar populations to photometric maps of M32

Astrophysics and Space Science, 1989
We have developed a new model of evolutionary synthesis of stellar population, from a working cyclical approximation to a general solution for the mass and time dependence of the ‘birth function’ of stars. The general solution enables us to introduce a functionG(t): the ratio of gas injected into a defined region to that which forms stars in the same ...
E. Casuso, J. E. Beckman, J. Cepa
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A new stellar spectrum interpolation algorithm and its application to Yunnan-III evolutionary population synthesis models

Monthly Notices of the Royal Astronomical Society, 2018
In evolutionary population synthesis (EPS) models, we need to convert stellar evolutionary parameters into spectra via interpolation in a stellar spectral library. For theoretical stellar spectral libraries, the spectrum grid is homogeneous on the effective-temperature and gravity plane for a given metallicity.
Liantao Cheng, Fenghui Zhang, Xiaoyu Kang, Lang Wang   +3 more
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PARSEC stellar evolutionary model: Rotation, Thermohaline mixing, Envelope Overshooting

Thermohaline mixing plays an important role in the mixing processes after the red-giant-branch's bump of low-mass stars. The interplay of thermohaline mixing with other processes such as the downward overshoot from the convective envelope or rotation should be carefully investigated.
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