57 citations · 201 across the 11 of their papers we have counts for
10 papers
A spectroscopic and kinematic survey of fast hot subdwarfs
S. Geier, U. Heber, A. Irrgang +19
Hot subdwarfs (sdO/B) are the stripped helium cores of red giants formed by binary interactions. Close hot subdwarf binaries with massive white dwarf companions have been proposed…
Looking into the cradle of the grave: J22564-5910, a young post-merger hot subdwarf?
Joris Vos, Ingrid Pelisoli, Jan Budaj +10
We present the discovery of J22564-5910, a new type of hot subdwarf (sdB) which shows evidence of gas present in the system and has shallow, multi-peaked hydrogen and helium lines…
Phase resolved spectroscopy and Kepler photometry of the ultracompact AM CVn binary SDSS J190817.07+394036.4
T. Kupfer, P. J. Groot, S. Bloemen +8
{\it Kepler} satellite photometry and phase-resolved spectroscopy of the ultracompact AM CVn type binary SDSS J190817.07+394036.4 are presented. The average spectra reveal a variet…
Binaries discovered by the MUCHFUSS project: SDSS J162256.66473051.1 - An eclipsing subdwarf B binary with a brown dwarf companion
V. Schaffenroth, S. Geier, U. Heber +5
Hot subdwarf B stars (sdBs) are core helium-burning stars located on the extreme horizontal branch. About half of the known sdB stars are found in close binaries. Their short orbit…
The helium-rich subdwarf CPD-20 1123: a post-common envelope binary evolving onto the extended horizontal branch
N. Naslim, S. Geier, C. S. Jeffery +3
Subluminous B stars come in a variety of flavours including single stars, close and wide binaries, and pulsating and non-pulsating variables. A majority have helium-poor surfaces (…
Low-mass stellar and substellar companions to sdB stars
S. Geier, L. Classen, P. Bruenner +9
It has been suggested that besides stellar companions, substellar objects in close orbits may be able to trigger mass loss in a common envelope phase and form hot subdwarfs. In an…