Results 61 to 70 of about 10,044,096 (256)
Library of high-resolution UES echelle spectra of F, G, K and M field dwarf stars
, 1998 We present a library of Utrecht echelle spectrograph (UES) observations of a sample of F, G, K and M field dwarf stars covering the spectral range from 4800 $\ {\rm \AA} $ to 10600 $\ {\rm \AA}$ with a resolution of 55000.
Montes Gutiérrez, David +3 more
core +1 more source
Ab Initio Thermoelectric Transport Calculations of Alloyed Half‐Heuslers
Advanced Science, EarlyView.The effect of alloying on the electronic transport of half‐Heusler thermoelectric materials is explored using a fully ab initio approach. A novel method is developed that combines calculations of alloyed supercells with Boltzmann transport, considering the full energy and momentum dependent scattering processes from first principles extracted ...
Ankit Kumar +2 more
wiley +1 more source
Searching for Rotational and Activity Signals in M Dwarf Stars [PDF]
, 2017 We search for signals coming from M dwarf stars through variations caused by stellar surface activity. The aims of this work are to find the stellar rotation period of M dwarf stars and check them against known planetary signals. We used photometric ASAS
Zayer, Imad
core +1 more source
UCAC2 46706450: A rapidly rotating K-type subgiant with an extremely hot white dwarf companion
, 2021 F, G, or K-type stars with a white dwarf companion are relatively rarely known systems in comparison to thousands of M stars with white dwarf companions.
Klaus Werner +7 more
core +1 more source
Advanced Science, EarlyView.A low‐temperature synthesis method of single‐crystalline NCA was successfully achieved by Sn doping, employing the same synthetic conditions as its polycrystalline counterparts. This synthesis was conducted at a temperature that was 150 °C lower than that required for synthesizing single‐crystalline NCA without Sn doping.
Guomeng Xie +4 more
wiley +1 more source
The Astronomical JournalThe rotation period of a star is an important quantity that provides insight into its structure and state. For stars with surface features like starspots, their periods can be inferred from brightness variations as these features move across the stellar ...
Soichiro Hattori +4 more
doaj +1 more source
, 2002 Study determined if 2MASS photometric data are reliable for luminosity classification using JHK plots of Reid and Hawley (2001). Effects of interstellar reddening on the placement of giant and dwarf data on the JIIK plot were analyzed. Dwarfs (N=54) were
Furiak, Nicolas M.
core
Advanced Science, EarlyView.We demonstrate that the inverse relationship between viscosity and conductivity in structured electrolytes can be circumvented by leveraging their hydrogen bonding networks for Grotthuss proton transport. Using a mixture of imidazole and levulinic acid, we show that the existence of extended hydrogen‐bonded chains that can rapidly reorient result in ...
Benworth B. Hansen +15 more
wiley +1 more source
Observations with the Differential Speckle Survey Instrument. X. Preliminary Orbits of K-dwarf Binaries and Other Stars [PDF]
, 2021 This paper details speckle observations of binary stars taken at the Lowell Discovery Telescope, the WIYN telescope, and the Gemini telescopes between 2016 January and 2019 September.
Willmarth, Daryl W. +10 more
core +1 more source
Flaring Activity for Low-mass Stars in the β Pictoris Moving Group
The Astronomical JournalStellar flares from K and M dwarfs release panchromatic radiation characterized by a significantly higher brightness temperature (∼9–20 kK) than the star. The increased frequency of magnetic activity on young low-mass stars results in the energy released
Jordan N. Ealy +3 more
doaj +1 more source