Classification of Metal-Deficient Dwarfs in the Vilnius Photometric System
Open Astronomy, 2003 Methods used for the quantitative classification of metal-deficient stars in the Vilnius photometric system are reviewed. We present a new calibration of absolute magnitudes for dwarfs and subdwarfs, based on Hipparcos parallaxes.
Lazauskaitė R. +2 more
doaj +1 more source
Volume-limited sample of low-mass red giant stars, the progenitors of hot subdwarf stars I. Sample selection and binary classification method [PDF]
, 2022 Murat Uzundag +5 more
openalex +1 more source
Microscopic diffusion and subdwarfs
, 1999 The recent distance determinations by HIPPARCOS have allowed to locate very precisely a reasonable set of subdwarfs in the HR diagram. A detailed comparison with evolutionary models is now possible and it has been recently claimed that the observed lower part of the main-sequence is cooler than the computed one.
Morel, P., Baglin, A.
openaire +2 more sources
Pulsating hot O subdwarfs in ω Centauri: mapping a unique instability strip on the extreme horizontal branch [PDF]
, 2016 We present the results of an extensive survey for rapid pulsators among Extreme Horizontal Branch (EHB) stars in ω Cen. The observations performed consist of nearly 100 h of time-series photometry for several off-centre fields of the cluster, as well as ...
S. Randall +12 more
semanticscholar +1 more source
Hot subluminous stars: Highlights from the MUCHFUSS and Kepler missions
EPJ Web of Conferences, 2013 Research into hot subdwarf stars is progressing rapidly. We present recent important discoveries. First we review the knowledge about magnetic fields in hot subdwarfs and highlight the first detection of a highly-magnetic, helium-rich sdO star.
Geier S., Heber U., Gaensicke B.
doaj +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
A Universal Transition in Atmospheric Diffusion for Hot Subdwarfs Near 18,000 K [PDF]
, 2017 In the color–magnitude diagrams of globular clusters, when the locus of stars on the horizontal branch extends to hot temperatures, discontinuities are observed at colors corresponding to ∼12,000 and ∼18,000 K.
T. Brown +8 more
semanticscholar +1 more source
A search for variable subdwarf B stars in TESS Full Frame Images – II. Variable objects in the northern ecliptic hemisphere [PDF]
, 2021 A. S. Baran +3 more
openalex +1 more source
THE ALLWISE MOTION SURVEY AND THE QUEST FOR COLD SUBDWARFS [PDF]
, 2014 The AllWISE processing pipeline has measured motions for all objects detected on Wide-field Infrared Survey Explorer (WISE) images taken between 2010 January and 2011 February.
J. Kirkpatrick +25 more
semanticscholar +1 more source
Hot subdwarf formation: Confronting theory with observation
EPJ Web of Conferences, 2013 The formation of hot subdwarf stars is still unclear. Both single-star and binary scenarios have been proposed to explain the properties of these evolved stars situated at the extreme blue end of the horizontal branch. The observational evidence gathered
Geier S.
doaj +1 more source