Results 11 to 20 of about 694 (118)
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
AKeplerK2 view of subdwarf A-type stars [PDF]
Astronomy & Astrophysics, 2021 Context.The spectroscopic class of subdwarf A-type (sdA) stars has come into focus in recent years because of their possible link to extremely low-mass white dwarfs, a rare class of objects resulting from binary evolution. Although most sdA stars are consistent with metal-poor halo main-sequence stars, the formation and evolution of a fraction of these
Mösenlechner, Gerald +5 more
openaire +2 more sources
The magnetic fields of hot subdwarf stars [PDF]
Astronomy & Astrophysics, 2012 Detection of magnetic fields has been reported in several sdO and sdB stars. Recent literature has cast doubts on the reliability of most of these detections. We revisit data previously published in the literature, and we present new observations to clarify the question of how common magnetic fields are in subdwarf stars.
Landstreet, John D +4 more
openaire +2 more sources
The origin of subdwarf B stars – I. The formation channels [PDF]
Monthly Notices of the Royal Astronomical Society, 2002 20 pages, 23 figures, accepted for publication in ...
Han, Z +4 more
openaire +4 more sources
Radial velocity variability and the evolution of hot subdwarf stars [PDF]
Astronomy & Astrophysics, 2022 Hot subdwarf stars represent a late and peculiar stage in the evolution of low-mass stars, since they are likely formed by close binary interactions. In this work, we perform a radial velocity (RV) variability study of a sample of 646 hot subdwarfs with multi-epoch radial velocities based on spectra from Sloan Digital Sky Survey (SDSS) and Large Sky ...
Geier, Stephan (Prof. Dr. Dr.) +5 more
openaire +3 more sources
The Origins of Hot Subdwarf Stars [PDF]
Publications of the Astronomical Society of the Pacific, 1992 High signal-to-noise optical spectrophotometry of a sample of filed subluminous B stars drawn largely from the Palomar Green ultraviolet-excess survey is analyzed with a new grid of model atmospheres and synthetic spectra. The stellar effective temperatures, surface gravities, and photospheric helium abundances are determined simultaneously from a ...
openaire +1 more source
Hot subdwarf stars in close-up view [PDF]
Astronomy & Astrophysics, 2012 Subluminous B stars (sdBs) form the extremely hot end of the horizontal branch and are therefore related to the blue horizontal branch (BHB) stars. While the rotational properties of BHB stars have been investigated extensively, studies of sdB stars have concentrated on close binaries that are influenced by tidal interactions between their components ...
Geier, S., Heber, U.
openaire +2 more sources
Annual Review of Astronomy and Astrophysics, 2009 Hot subdwarf stars (sdBs, sdOs) are core helium-burning stars at the blue end of the horizontal branch or have evolved even beyond that stage. They are found in all Galactic stellar populations and are sufficiently common to account for the UV-upturn of early-type galaxies.
openaire +2 more sources
SuperWASP Lightcurves of Subdwarf Stars [PDF]
, 2008 SuperWASP is a wide angle survey for transiting hot-Jupiter exoplanets around bright ...
Maxted, P. F. L. +4 more
openaire +1 more source
Radial velocity measurements of Subdwarf B stars [PDF]
, 2011 MNRAS accepted. 22 pages with 10 tables and 4 figures. Revised to correct the object name of the helium-rich sdB mentioned in the last paragraph of section 4 ...
Copperwheat, C. M. +4 more
openaire +2 more sources