Resolving the pulsations of subdwarf B stars: HS 0039+4302, HS 0444+0458, and an examination of the group properties of resolved pulsators [PDF]
, 2007 We continue our program of single-site observations of pulsating subdwarf B (sdB) stars and present the results of extensive time series photometry of HS 0039+4302 and HS 0444+0458. Both were observed at MDM Observatory during the fall of 2005. We extend
An, D. +5 more
core +2 more sources
Ages of White Dwarf-Red Subdwarf Systems [PDF]
, 2005 We provide the first age estimates for two recently discovered white dwarf-red subdwarf systems, LHS 193AB and LHS 300AB. These unusual systems provide a new opportunity for linking the reliable age estimates for the white dwarfs to the (measurable ...
Bessel M. S. +9 more
core +3 more sources
He-rich Hot Subdwarf Stars Observed in Gaia DR3 and LAMOST DR7: Carbon and Nitrogen Abundances and Kinematics [PDF]
The Astrophysical Journal Supplement SeriesWe conducted an analysis of the abundances of He, C, and N in 210 He-rich hot subdwarfs observed within both the Gaia Data Release 3 (DR3) and LAMOST DR7 data sets.
Yangping Luo +3 more
doaj +2 more sources
Constraining Roche-Lobe Overflow Models Using the Hot-Subdwarf Wide Binary Population
Open Astronomy, 2017 One of the important issues regarding the final evolution of stars is the impact of binarity. A rich zoo of peculiar, evolved objects are born from the interaction between the loosely bound envelope of a giant, and the gravitational pull of a companion ...
Vos Joris, Vučković Maja
doaj +3 more sources
Classification of LAMOST spectra of B-type and hot subdwarf stars using kernel support vector machine [PDF]
Scientific ReportsMachine learning has emerged as a leading field in artificial intelligence, demonstrating expert-level performance in various domains. Astronomy has benefited from machine learning techniques, particularly in classifying and identifying stars based on ...
Muhammad Tahir +5 more
doaj +2 more sources
Hot subdwarf stars and their connection to thermonuclear supernovae [PDF]
, 2016 Hot subdwarf stars (sdO/Bs) are evolved core helium-burning stars with very thin hydrogen envelopes, which can be formed by common envelope ejection. Close sdB binaries with massive white dwarf (WD) companions are potential progenitors of thermonuclear ...
Geier, S. +6 more
core +4 more sources
Exploring the Extremes: Characterizing a New Population of Old and Cold Brown Dwarfs
The Astronomical Journal, 2023 Mapping out the populations of thick disk and halo brown dwarfs is important for understanding the metallicity dependence of low-temperature atmospheres and the substellar mass function.
Aaron M. Meisner +5 more
doaj +1 more source
Asteroseismic Observations of Hot Subdwarfs
Frontiers in Astronomy and Space Sciences, 2021 There are a number of reasons for studying hot subdwarf pulsation; the most obvious being that these stars remain a poorly understood late-stage of stellar evolution and knowledge of their interior structure, which pulsation studies reveal, constrains ...
A. E. Lynas-Gray +2 more
doaj +1 more source
Meet the family − the catalog of known hot subdwarf stars
Open Astronomy, 2017 In preparation for the upcoming all-sky data releases of the Gaia mission, we compiled a catalog of known hot subdwarf stars and candidates drawn from the literature and yet unpublished databases.
Geier Stephan +8 more
doaj +2 more sources
Hot Subdwarf Stars Identified in LAMOST DR8 with Single-lined and Composite Spectra
The Astrophysical Journal, 2023 A total of 222 hot subdwarf stars were identified with LAMOST DR8 spectra, among which 131 stars show composite spectra and have been decomposed, while 91 stars present single-lined spectra.
Zhenxin Lei +8 more
doaj +1 more source