Results 71 to 80 of about 553,339 (197)

Variations in the Milky Way’s Stellar Mass Function at [Fe/H] < −1

The Astrophysical Journal Letters
We present the first determination of the Galactic stellar mass function (MF) for low-mass stars (0.2–0.5 M _⊙ ) at metallicities [Fe/H] ≲ −1. A sample of ∼53,000 stars was selected as metal-poor on the basis of both their halolike orbits and their ...
Jiadong Li, Hans-Walter Rix, Yuan-Sen Ting, Yu-Ting Wang, Szabolcs Mészáros, Ilija Medan, Chao Liu, Zhiqiang Yan, Peter J. Smith, Dan Qiu, Alexandre Roman-Lopes, Gregory M. Green, Danny Horta, Zachary Way, Tadafumi Matsuno, Stefano O. Souza, José G. Fernández-Trincado   +16 more
doaj   +1 more source

Jsolated Stars of Low Metallicity

Galaxies, 2018
We study the effects of a reduced mass-loss rate on the evolution of low metallicity Jsolated stars, following our earlier classification for angular momentum (J) isolated stars.
Efrat Sabach
doaj   +1 more source

Evolutionary effects of mass loss in low-mass stars [PDF]

International Astronomical Union Colloquium, 1981
AbstractThe effects of mass loss on the evolution of low-mass stars (actual mass smaller than 1.4 Mʘ) are reviewed. The case of globular cluster stars is discussed in some detail, and it is shown that evolutionary theory sets quite precise limits to the mass-loss rate in population II red giants.
openaire   +1 more source

HAZMAT III: The UV Evolution of Mid- to Late-M Stars with GALEX

, 2018
Low-mass stars are currently the most promising targets for detecting and characterizing habitable planets in the solar neighborhood. However, the ultraviolet (UV) radiation emitted by such stars can erode and modify planetary atmospheres over time ...
Schneider, Adam C., Shkolnik, Evgenya L.
core   +1 more source

ε-mechanism driven pulsations in hot subdwarf stars with mixed H-He atmospheres

Open Astronomy, 2017
The ε mechanism is a self-excitation mechanism of stellar pulsations which acts in regions where nuclear burning takes place. It has been shown that the ε mechanism can excite pulsations in hot pre-horizontal branch stars before they settle into the ...
Battich Tiara, Bertolami Marcelo M. Miller, Córsico Alejandro H., Althaus Leandro G.   +3 more
doaj   +1 more source

A Stellar Rotation Census of B Stars: from ZAMS to TAMS

, 2010
Two recent observing campaigns provide us with moderate dispersion spectra of more than 230 cluster and 370 field B stars. Combining them and the spectra of the B stars from our previous investigations ($\sim$430 cluster and $\sim$100 field B stars ...
Abt, Abt, Cranmer, Cranmer, D. R. Gies, Gies, Heger, Howarth, Huang, Huang, Huang, Lanz, Larson, Larson, M. V. McSwain, Maeder, Mason, McAlister, McSwain, McSwain, McSwain, Meynet, Pols, Porter, Rappaport, Schaller, Strom, Talon, Wenjin Huang, Wolff, Wolff, Wolff   +31 more
core   +1 more source

Mixed Phase in Compact Starts : M-R relations and radial oscillations

, 2003
It is believed that quark stars or neutron stars with mixed phase in the core have smaller radii compared to ordinary compact stars. With the recent observation of several low radius objects, typically a radius of $
Akaml A., ASHOK GOYAL, Chandrasekhar S., Drake J. J., Dutta B., Glendenning N. K., Glendenning N. K.   +6 more
core   +2 more sources

Realistic Uncertainties for Fundamental Properties of Asteroseismic Red Giants and the Interplay between Mixing Length, Metallicity, and

The Astrophysical Journal
Asteroseismic modeling is a powerful way to derive stellar properties. However, the derived quantities are limited by built-in assumptions used in stellar models.
Yaguang Li, Timothy R. Bedding, Daniel Huber, Dennis Stello, Jennifer van Saders, Yixiao Zhou, Courtney L. Crawford, Meridith Joyce, Tanda Li, Simon J. Murphy, K. R. Sreenivas   +10 more
doaj   +1 more source

High-resolution Elemental Abundance Measurements of Cool JWST Planet Hosts Using AutoSpecFit: An Application to the Sub-Neptune K2-18b’s Host M Dwarf

The Astrophysical Journal
We present an in-depth, high-resolution spectroscopic analysis of the M dwarf K2-18, which hosts a sub-Neptune exoplanet in its habitable zone. We show our technique to accurately normalize the observed spectrum, which is crucial for a proper spectral ...
Neda Hejazi, Ian J. M. Crossfield, Diogo Souto, Jonathan Brande, Thomas Nordlander, Emilio Marfil, Katia Cunha, David R. Coria, Zachary G. Maas, Alex S. Polanski, Natalie R. Hinkel, Joseph E. Hand   +11 more
doaj   +1 more source

The Initial Mass Function of Low-mass Stars and Brown Dwarfs in the W3 Complex. [PDF]

Astron J, 2021
Huston MJ, Luhman KL.
europepmc   +1 more source