Results 31 to 40 of about 6,211 (193)
Kinematics of nearby subdwarf stars [PDF]
Astronomy & Astrophysics, 2005 We present an analysis of the space motions of 742 subdwarf stars based on the sample of Carney et al. (1994, CLLA). Hipparcos parallaxes, TYC2+HIP proper motions and Tycho2 proper motions were combined with radial velocities and metallicities from CLLA. The kinematical behavior is discussed in particular in relation to their metallicities.
Arifyanto, M. I. +3 more
openaire +2 more sources
Diffusion in hot subdwarf progenitors from the common envelope channel
Open Astronomy, 2017 Diffusion of elements in the atmosphere of a star can drastically affect its surface composition, sometimes leading to unusual mixtures. These chemically peculiar stars can be identified fromthe presence of unusual lines in their spectra.
Byrne Conor M. +3 more
doaj +1 more source
Wolf 1130: A Nearby Triple System Containing a Cool, Ultramassive White Dwarf [PDF]
, 2018 Following the discovery of the T8 subdwarf WISEJ200520.38+542433.9 (Wolf 1130C), with common proper motion to a binary (Wolf 1130AB) consisting of an M subdwarf and a white dwarf, we set out to learn more about the old binary in the system.
Gosnell, Natalie M. +11 more
core +3 more sources
Asteroseismology of Pulsating sdB Stars Observed at Catania Astrophysical Observatory
Open Astronomy, 2003 We present analysis of the data collected during three years of photometric campaigns at the 91 cm Cassegrain telescope of the Catania Astrophysical Observatory to observe the pulsating subdwarf B star PG 1336-018.
Bonanno A. +5 more
doaj +1 more source
Mass Distribution for Single-lined Hot Subdwarf Stars in LAMOST
The Astrophysical Journal, 2023 Masses for 664 single-lined hot subdwarf stars identified in LAMOST were calculated by comparing synthetic fluxes from spectral energy distribution with observed fluxes from a Virtual Observatory service.
Zhenxin Lei +6 more
doaj +1 more source
MUCHFUSS - Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS [PDF]
, 2012 The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims at finding hot subdwarf stars with massive compact companions (white dwarfs with masses $M>1.0 {\rm M_{\odot}}$, neutron stars or black holes). The existence
Abazajian +26 more
core +2 more sources
Evidence of Resonant Mode Coupling in the Hot B Subdwarf Star KIC 10139564
EPJ Web of Conferences, 2015 The Kepler spacecraft provides new opportinuties to observe long term frequency and amplitude modulations of oscillation modes in pulsating stars. We analyzed more than three years of uninterrupted data obtained with this instrument on the hot B subdwarf
Zong W., Charpinet S., Vauclair G.
doaj +1 more source
Spectroscopy of hot subdwarf binaries
Open Astronomy, 2018 We present a status report of our spectroscopic analysis of subdwarf binaries consisting of a subdwarf and a F/G/K-type main-sequence companion. These systems selected from SDSS photometry show significant excess in the (infra-)red which can not be ...
Kreuzer Simon +2 more
doaj +1 more source
Looking at the bright side - The story of AA Dor as revealed by its cool companion [PDF]
, 2015 Irradiation effects in close binaries are crucial for a reliable determination of system parameters and understanding the close binary evolution. We study irradiated light originating from the low mass component of an eclipsing system comprising a hot ...
Bloemen, Steven +4 more
core +2 more sources
The Unseen Population of F to K-type Companions to Hot Subdwarf Stars
, 2012 We present a method to select hot subdwarf stars with A to M-type companions using photometric selection criteria. We cover a wide range in wavelength by combining GALEX ultraviolet data, optical photometry from the SDSS and the Carlsberg Meridian ...
Abazajian +98 more
core +1 more source