Spectral evolution with increasing stellar age
Stellar Astrophysics: Stellar Evolution 1. Stellar Evolution
... accounting for the absence of hydrogen. But there may not be enough of them with enough masses and tight enough to merge over the age of the Universe. Also how could the explosion of two merged WDs be a standard ...
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Studies in stellar structure and evolution
... I grid o f isochrones can be constructed. For the two sequences we have ca lcu la ted fo r 1 M© s ta r s , comparisons w ith Hejle s e n 's (1980) r e s u lts show a s h if t in the isochrones for an age 5 x 10^ ...
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Trends of Stellar Evolution in Modern Physics
... The internal forces of gravity, while the cloud continues to be in a gaseous form, always do work, remaining active forces and not turning into potential forces. Thus, in the absence of losses, the forces of gravity ...
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Stellar evolution and the Standard Solar Model
... The stellar gas pressure is mainly due to its ...contracts increasing its temperature and reaching again the hydrostatic equilibrium until the radiation losses from the surface cools down again the ...
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The Evolution of the Galaxy Stellar Mass Function at z = 4-8: A Steepening Low-mass-end Slope with Increasing Redshift
... While this study provides better constraints on the GSMF at z = 4–8, the uncertainties of the GSMFs on both mass ends and at the highest redshift probed in this study are still substantial. Although the advent of JWST ...
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Elliptical galaxies : structure, stellar content, and evolution
... of stellar populations parameters in defining the early–type galaxy ...an age–metallicity “conspiracy,” then the scatter of the near–infrared FP will be large due to the minimized metallicity effects in the ...
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Stellar Evolution from AGB to Planetary Nebulae
... Frank 1995). According to this scenario, PNe morphology should be age-dependent with the most evolved objects being most extreme in bipolar form and the youngest members being much less so. However, imaging of ...
A teaching-learning module on stellar structure and evolution
... phase: spectral analysis We introduce the second phase activities asking students the following driving questions “Which quantities can we measure using light emitted by ...
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Stellar magnetism: empirical trends with age and rotation
... ASSESS STELLAR AGE One of our most interesting findings is the empirical trend between large-scale magnetism and ...age. Age is one of the most fundamental stellar ...star, ...
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Stellar magnetism: empirical trends with age and rotation
... the stellar surface than the large-scale field ...the stellar wind. If indeed magnetized stellar winds are the main mechanism of removing angular momentum from the star in the MS phase, one should ...
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Stellar magnetism : empirical trends with age and rotation
... the stellar surface than the large-scale field ...the stellar wind. If indeed magnetized stellar winds are the main mechanism of removing angular momentum from the star in the MS phase, one should ...
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Age-Dating of Young Stars and Stellar Systems
... to age-date compact star clusters in the cooling- flow galaxy NGC 1275 (Brodie et ...high spectral resolution, but they have the advantage of being (almost) independent of metallicity and unaffected by ...
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HERBIG-HARO FLOWS: Probes of Early Stellar Evolution
... 8.2. The Utility of Giant HH Flows The large sizes and high dynamical ages of outflows from young, low-mass stars has a number of important implications. 8.2.1. MASS-LOSS HISTORIES OF YSOs The morphology and kinematics ...
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Physical and chemical aspects of late stages of stellar evolution
... 34 Mass transfer in symbiotic stars J. Mikołajewska, Nicolaus Copernicus Astronomical Center, Warszawa, Poland Among the most fundamental questions posed by symbiotic binaries is the process of mass transfer, whether it ...
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Period Change and Stellar Evolution of β Cephei Stars
... the evolution of B-type stars and the transition from main sequence to hydrogen-shell burning ...star evolution, including rotational mixing, convective core overshooting, magnetic fields, and ...
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SPECTRAL EVOLUTION OF AN EARTH-LIKE PLANET
... Depending on the degree of oxidation of a planet's crust and upper mantle non-biological mechanisms can also produce large amounts of CH 4 under certain circumstances. Oxygen and N 2 O are two very promising ...
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Radio Spectral Evolution with Photonics Technologies
... 18(c) for each line indicated in Fig. 18(b) [15]. IV. Conclusion We have described how effectively to explore untapped frequency regions from 100 GHz to 1 THz, using ultra-broadband photonics technologies. Use of optical ...
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The properties of the stellar populations in ULIRGs - I. Sample, data and spectral synthesis modelling
... In this study, we use an updated version of the code that allows a more detailed analysis of the different, important regions of the optical spectra and, therefore, it is possible to refine the results pre- sented in ...
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A LARGE STELLAR EVOLUTION DATABASE FOR POPULATION SYNTHESIS STUDIES. II. STELLAR MODELS AND ISOCHRONES FOR AN -ENHANCED METAL DISTRIBUTION
... total stellar mass after the RGB phase, using the fixed core mass and chemical profiles given by an RGB progenitor having an age (at the RGB tip) of 13 ...metallicities, increasing up to ...
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Age as a Major Factor in the Onset of Multiple Populations in Stellar Clusters
... The dependence of light element variations on age is not predicted by any model that has been proposed to explain the formation and evolution of MPs. All self-enrichment models share the notion that a ...
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