Results 21 to 30 of about 805 (173)
A search for transiting planets around hot subdwarfs [PDF]
, 2022 Context. Hot subdwarfs, which are hot and small He-burning objects, are ideal targets for exploring the evolution of planetary systems after the red giant branch (RGB).
Thuillier, Antoine +14 more
core +1 more source
Hot Subdwarfs in the Galactic Bulge [PDF]
The Astrophysical Journal, 2005 Recent observations and theories suggest that extreme horizontal branch (EHB) stars and their progeny should be the cause of the UV excess seen in the spectra of many elliptical galaxies. Since the Galactic Bulge is the closest representation of an old, metal-rich spheroid in which we are able to study the EHB scenario in detail, we obtained spectra of
Busso, Giorgia +4 more
openaire +3 more sources
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
FINDING EXTREME SUBDWARFS [PDF]
The Astronomical Journal, 2008 23 pages, 10 figures.
openaire +2 more sources
The Formation of Subdwarf A-type Stars [PDF]
The Astrophysical Journal, 2019 Abstract Subdwarf A-type stars (sdAs) are objects that have hydrogen-rich spectra with surface gravity similar to that of hot subdwarf stars but effective temperature below the zero-age horizontal branch. They are considered to be metal-poor main-sequence (MS) stars or extremely low-mass white dwarfs (ELM WDs).
Jinlong Yu +8 more
openaire +2 more sources
The Formation of Subdwarf B Stars [PDF]
International Astronomical Union Colloquium, 2002 AbstractWe performed full binary evolution calculations and carried out binary population synthesis studies in order to investigate the formation of subdwarf B (sdB) stars via the channels of stable Roche lobe overflow (RLOF), common envelope ejection and helium white dwarf mergers. Our model is successful in the explanation of observational properties
Han, Z +4 more
openaire +2 more sources
In Pursuit of the Least Luminous Galaxies
Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010 The dwarf galaxy companions to the Milky Way are unique cosmological laboratories. With luminosities as low as 10−7LMW, they inhabit the lowest mass dark matter halos known to host stars and are presently the most direct tracers of the distribution, mass spectrum, and clustering scale of dark matter.
Beth Willman, Regina Schulte-Ladbeck
wiley +1 more source
A FEROS Survey of Hot Subdwarf Stars
Open Astronomy, 2018 We have completed a survey of twenty-two ultraviolet-selected hot subdwarfs using the Fiber-fed Extended Range Optical Spectrograph (FEROS) and the 2.2-m telescope at La Silla. The sample includes apparently single objects as well as hot subdwarfs paired
Vennes Stéphane +2 more
doaj +1 more source
Wide companions to M and L subdwarfs with
, 2021 Aims. The aim of the project is to identify wide common proper motion companions to a sample of spectroscopically confirmed M and L metal-poor dwarfs (also known as subdwarfs) to investigate the impact of metallicity on the binary fraction of low-mass ...
M.-C. Gálvez-Ortiz +11 more
core +1 more source
Hot subdwarfs in close binaries observed from space I.
, 2022 Context: About a third of the hot subdwarfs of spectral type B (sdBs), which are mostly core-helium-burning objects on the extreme horizontal branch, are found in close binaries with cool, low-mass stellar, substellar, or white dwarf companions.
Schaffenroth, Veronika (Dr. habil.) +4 more
core +2 more sources