Results 91 to 100 of about 7,790 (232)
SDSS J125637-022452: a high proper motion L subdwarf [PDF]
, 2009 We report the discovery of a high proper motion L subdwarf ($\mu$ =0.617arcsec/yr) in the Sloan Digital Sky Survey spectral database. The optical spectrum from the star SDSS J125637-022452 has mixed spectral features of both late-M spectral subtype ...
A. K. Kembhavi +29 more
core +2 more sources
Constraining Roche-Lobe Overflow Models Using the Hot-Subdwarf Wide Binary Population
Open Astronomy, 2017 One of the important issues regarding the final evolution of stars is the impact of binarity. A rich zoo of peculiar, evolved objects are born from the interaction between the loosely bound envelope of a giant, and the gravitational pull of a companion ...
Vos Joris, Vučković Maja
doaj +1 more source
A search for lithium in metal-poor L dwarfs
, 2015 The aim of the project is to search for lithium in absorption at 6707.8 Angstroms to constrain the nature and the mass of the brightest low-metallicity L-type dwarfs (refered to as L subdwarfs) identified in large-scale surveys.
Burgasser, A. J. +3 more
core +1 more source
New Pulse Timing Measurements of the sdBV Star CS 1246
Open Astronomy, 2017 CS 1246 is a hot subdwarf B star discovered in 2009 to exhibit a single, large-amplitude radial pulsation. An O-C diagram constructed from this mode revealed reflex motion due to the presence of a low-mass M dwarf, as well as a long-term trend consistent
Hutchens Zackary L. +7 more
doaj +1 more source
Odessa Astronomical Publications, 2011 The data about occurrence frequency of substars and white dwarfs among close stars are analyzed. The estimation of partial content of subdwarfs and stellar remains among populations II and III as function of power of initial mass function have been made.
В. А. Захожай +2 more
doaj +1 more source
Extreme Enhancements of r-process Elements in the Cool Metal-Poor Main-Sequence Star SDSS J2357-0052
, 2010 We report the discovery of a cool metal-poor, main-sequence star exhibiting large excesses of r-process elements. This star is one of two newly discovered cool subdwarfs (effective temperatures of 5000 K) with extremely low metallicity ([Fe/H]
Aoki, Wako +3 more
core +1 more source
The Astrophysical Journal, 1982 The properties and evolutionary status of the hot B and O subdwarfs are reinvestigated using recent homogeneous grids of hot, high-gravity model atmospheres and detailed convective envelope calculations appropriate to the hot subdwarf region of the H-R diagram discussed by Greenstein and Sargent.
F. Wesemael +4 more
openaire +1 more source
On the 3He anomaly in hot subdwarf B stars
Open Astronomy, 2017 Decades ago, 3He isotope enrichment in helium-weak B-type main-sequence, in blue horizontal branch and in hot subdwarf B (sdB) stars, i.e., helium-core burning stars of the extreme horizontal branch, were discovered. Diffusion processes in the atmosphere
Schneider David +4 more
doaj +1 more source
The Schizophrenic Spectrum of LSR 1610-0040: a Peculiar M Dwarf/Subdwarf
, 2005 We present a moderate resolution (R=2000), 0.8-4.1 micron spectrum of LSR 1610-0040, a high proper motion star classified as an early-type L subdwarf by Lepine and collaborators based on its red-optical spectrum.
Bessell M. +4 more
core +2 more sources
Spectral energy distribution of M-subdwarfs: A study of their atmospheric properties [PDF]
, 2016 Context. M-type subdwarfs are metal-poor low-mass stars and probe for the old populations in our Galaxy. Accurate knowledge of their atmospheric parameters and especially the composition is essential for understanding the chemical history of our Galaxy ...
A. Rajpurohit +8 more
semanticscholar +1 more source