Results 11 to 20 of about 152,062 (293)
Stellar Winds in A-Type Supergiants [PDF]
Symposium - International Astronomical Union, 1994 A-type supergiants are just at the boundary between the early type supergiants, with strong stellar winds driven by radiation pressure and the cool supergiants in which the origin of mass loss is the dissipation of mechanical energy. The mechanisms involved in the mass loss processes in A supergiants as a whole, are still uncertain.
E. Verdugo, A. Talavera
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Stellar winds in a-type supergiants [PDF]
International Astronomical Union Colloquium, 1989 The contribution of A supergiant stars to the return of mass and energy to the interstellar medium is not very important. Abbott (1982) analised a sample of early stars and concluded that B and A supergiants provided less than 8 % of the mass input to the ISM by stellar winds.
A. Talavera, A.I. Gomez de Castro
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Magnetic Archaeology of Early-type Stellar Dynamos
The Astrophysical Journal, 2021 Abstract Early-type stars show a bimodal distribution of magnetic field strengths, with some showing very strong fields (≳1 kG) and others very weak fields (≲10 G). Recently, we proposed that this reflects the processing or lack thereof of fossil fields by subsurface convection zones.
Adam S. Jermyn, Matteo Cantiello
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Stellar Population gradients in early-type galaxies [PDF]
Proceedings of the International Astronomical Union, 2006 Abstract Long-slit spectra have been obtained with the Keck telescope for a sample of 11 early-type galaxies covering a range in luminosity. Rotation velocity and velocity dispersions, together with 20 Lick line-strength gradients have been measured to two effective radius.
Sánchez-Bálzquez, Patricia +5 more
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Types of Stellar Instabilities [PDF]
Highlights of Astronomy, 1980 Aside from violent phenomena, regular forms of motions originate often in instabilities and the linear theory with terms ∞ exp (st) yields already significant information. The system, here a spherical star, will be the seat of an instability if R (s) > 0.
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A new type of stellarator divertor: the hybrid stellarator divertor
, 2021 A new type of stellarator divertor is found. It has features of both a nonresonant divertor (A. Punjabi and A. H. Boozer, Phys. Plasmas 27, 012503 (2020)) as well as a resonant divertor. It has the outermost confining surface with sharp edges and large islands outside the outermost surface. For this reason, we have called it hybrid divertor.
Punjabi, Alkesh, Boozer, Allen H.
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Evolution of solar‐type stellar winds [PDF]
Astronomische Nachrichten, 2013 AbstractBy extending our self‐consistent MHD simulations for the solar wind, we study the evolution of stellar winds of solar‐type stars from early main sequence stage to red giant phase. Young solar‐type stars are active and the mass loss rates are larger by up to ∼100 times than that of the present‐day sun.
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Empirical 2MASS–WFC3/IR Filter Transformations Across the H-R Diagram from Synthetic Photometry
The Astronomical Journal, 2023 Near-infrared bandpasses on spaceborne observatories diverge from their ground-based counterparts as they are free of atmospheric telluric absorption.
M. J. Durbin +4 more
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Star Formation Rate Distributions: Inadequacy of the Schechter Function [PDF]
, 2012 In this paper we posit that galaxy luminosity functions (LFs) come in two fundamentally different types depending on whether the luminosity traces galaxy stellar mass or its current star formation rate (SFR).
Lee, Janice C., Salim, Samir
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Stellar Populations in Field Early–Type Galaxies [PDF]
, 2009 With the aim of understanding the role played by mass and environment on the evolution of early-type galaxies (ETGs), we are performing a multi-band study from ultraviolet (UV) to infrared (IR) of a sample 65 nearby ETGs. We derived Lick line-strength indices at different galacto-centric distances from the optical spectra (3700-7000 Å), and extracted ...
Annibali, F. +5 more
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