Results 101 to 110 of about 374,493 (293)

Interstellar Reddening Effect on the Age Dating of Population II Stars

Galaxies, 2017
The age measurement of the stellar halo component of the Galaxy is based mainly on the comparison of the main sequence turn-off luminosity of the globular cluster (GC) stars with theoretical isochrones.
Sergio Ortolani, Santi Cassisi, Maurizio Salaris   +2 more
doaj   +1 more source

The HST Large Program on Omega Centauri. I. Multiple stellar populations at the bottom of the main sequence probed in NIR-Optical

, 2017
As part of a large investigation with Hubble Space Telescope to study the faintest stars within the globular cluster Omega Centauri, in this work we present early results on the multiplicity of its main sequence (MS) stars, based on deep optical and near-
Anderson, J., Apai, D., Bedin, L. R., Bellini, A., Bergeron, P., Burgasser, A. J., Dotter, A., Marino, A. F., Milone, A. P., Rees, J. M.   +9 more
core   +1 more source

Gut microbiome and aging—A dynamic interplay of microbes, metabolites, and the immune system

FEBS Letters, EarlyView.
Age‐dependent shifts in microbial communities engender shifts in microbial metabolite profiles. These in turn drive shifts in barrier surface permeability of the gut and brain and induce immune activation. When paired with preexisting age‐related chronic inflammation this increases the risk of neuroinflammation and neurodegenerative diseases.
Aaron Mehl, Eran Blacher
wiley   +1 more source

Sloan Digital Sky Survey IV MaStar: Quantification and Abatement of Interstellar Absorption in the Largest Empirical Stellar Spectral Library

The Astrophysical Journal
We assess the impact of Ca ii λ λ 3934, 3969 and Na i λ λ 5891, 5897 absorption arising in the interstellar medium (ISM) on the Sloan Digital Sky Survey-IV MaNGA Stellar Library (MaStar) and produce corrected spectroscopy for 80% of the 24,162-star ...
Kate H. R. Rubin, Kyle B. Westfall, Claudia Maraston, Daniel Thomas, Renbin Yan, J. Christopher Howk, Erick Aguirre, Kaelee S. Parker, David R. Law   +8 more
doaj   +1 more source

Calibrating the tip of the red giant branch and measuring Magellanic Cloud distances to ∼2% exclusively with Gaia

Astronomy & Astrophysics
We have calibrated the tip of the red giant branch (TRGB) using our recent catalogue of homogeneous globular cluster (GC) distances. The GC distances were determined via a global joint fit to optical period–Wesenheit relations of their member RR Lyrae ...
Cruz Reyes Mauricio, Anderson Richard I., Lengen Bastian   +2 more
doaj   +1 more source

The effect of massive binaries on stellar populations and supernova progenitors

, 2007
We compare our latest single and binary stellar model results from the Cambridge STARS code to several sets of observations. We examine four stellar population ratios, the number of blue to red supergiants, the number of Wolf-Rayet stars to O supergiants,
Belczynski, Brandt, Cameron, Cantiello, Cappellaro, Cappellaro, Chiosi, Christopher A. Tout, Crowther, Crowther, de Donder, de Donder, de Jager, Deupree, Dray, Dray, Eggenberger, Eggleton, Eggleton, Eldridge, Eldridge, Eldridge, Ferguson, Hansen, Heger, Heger, Heger, Heger, Hirschi, Hurley, Hurley, Izzard, Izzard, Izzard, John J. Eldridge, Kotak, Kroupa, Kudritzki, Langer, Livio, Maeder, Maeder, Massey, Massey, Meynet, Meynet, Meynet, Meynet, Meynet, Nugis, Paczynski, Pastorello, Petrovic, Petrovic, Podsiadlowski, Podsiadlowski, Podsiadlowski, Pols, Popov, Prantzos, Robert G. Izzard, Sills, Smartt, Smartt, Smith, Turatto, Van Dyk, Vanbeveren, Vanbeveren, Vink, Vink, Vázquez, Wellstein, Woosley, Young   +74 more
core   +1 more source

Valosin‐containing protein counteracts ATP‐driven dissolution of FUS condensates through its ATPase activity in vitro

FEBS Letters, EarlyView.
Biomolecular condensates formed by fused in sarcoma (FUS) are dissolved by high ATP concentrations yet persist in cells. Using a reconstituted system, we demonstrate that valosin‐containing protein (VCP), an AAA+ ATPase, counteracts ATP‐driven dissolution of FUS condensates through its D2 ATPase activity.
Hitomi Kimura, Shin‐ichi Tate, Kyota Yasuda   +2 more
wiley   +1 more source

Core-collapse supernovae ages and metallicities from emission-line diagnostics of nearby stellar populations

, 2018
Massive stars are the main objects that illuminate H II regions and they evolve quickly to end their lives in core-collapse supernovae (CCSNe). Thus it is important to investigate the association between CCSNe and H II regions.
Eldridge, J. J., Galbany, L., Stanway, Elizabeth R., Xiao, Lin   +3 more
core   +1 more source

Diversity and complexity in neural organoids

FEBS Letters, EarlyView.
Neural organoid research aims to expand genetic diversity on one side and increase tissue complexity on the other. Chimeroids integrate multiple donor genomes within single organoids. Self‐organising multi‐identity organoids, exogenous cell seeding, or enforced assembly of region‐specific organoids contribute to tissue complexity.
Ilaria Chiaradia, Madeline A. Lancaster
wiley   +1 more source

Hα Emission among Evolved FGKM Stars: A Compendium from the Literature

The Astronomical Journal
Emission in the wings of the H α line among late-type giant stars occurs as a consequence of conditions in their chromospheres. Data from the literature have been used to document the incidence of H α emission among Population I giant stars as a function
Graeme H. Smith
doaj   +1 more source