Results 61 to 70 of about 1,023 (124)

Pulsations driven by the ɛ-mechanism in post-merger remnants: First results

EPJ Web of Conferences, 2013
Helium-rich subdwarfs are a rare subclass of hot subdwarf stars which constitute a small and inhomogeneous group showing varying degrees of helium enrichment. Only one star, LS IV °14 116 has been found to show multiperiodic luminosity variations.
Zhang X., Córsico A.H., Bertolami M.M. Miller, Althaus L.G., Jeffery C.S.   +4 more
doaj   +1 more source

Finding Cool Subdwarfs Using a V-J Reduced Proper-Motion Diagram: Stellar Parameters for 91 Candidates

, 2015
We present the results of a search for cool subdwarfs for which our candidates were drawn from a V-J reduced proper-motion diagram constructed by Salim & Gould.
Yong, David, Lambert, David L
core   +1 more source

Hipparcos Subdwarfs And Globular Clusters: Towards Reliable Absolute Ages

The distance and age of the key globular cluster M92 are determined with Hipparcos field subdwarfs. [Fe/H] values for subdwarfs we re measured with the Coravel spectrometer.
Y. Lebreton, F. Pont, D.A. VandenBerg, C. Turon, M. Mayor, C. Charbonnel   +5 more
core  

Helium-rich hot subdwarfs and single low-mass white dwarfs: formation mechanisms and further implications

, 2010
Variations in the mass loss from single stars have been used to explain the existence of hot subdwarf stars and the existence of single low-mass white dwarfs (LMWDs).
Han, Zhanwen, Justham, Stephen, Wolf, Christian, Podsiadlowski, Ph., Christian Wolf, Zhanwen Han, Philipp Podsiadlowski, Stephen Justham   +7 more
core   +2 more sources

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., Bartkevičius A., Bartašiūtė S.   +2 more
doaj   +1 more source

HR6819: a puffed-up stripped star system challenging stable mass transfer theory

Astronomy & Astrophysics
Context. HR6819 is the first system with a puffed-up low-mass stripped star + a classical Be star whose nature has been confirmed by optical interferometry.
Picco A., Marchant P., Sana H., Bodensteiner J., Shenar T., Frost A. J., Deshmukh K., Mombarg J. S. G., Pauli D., Willcox R., Kemp A.   +10 more
doaj   +1 more source

Kinematics Of Subdwarfs Based On Hipparcos Parallaxes And Proper Motions

Hipparcos parallaxes and proper motions were combined with radial velocities and metallicities from Carney et al. (1994). As a result a sample of 237 high-velocity stars was obtained having highly accurate space velocities and uniformly determined ...
B. Fuchs, R. Wielen, H. Jahreiß
core  

The massive hot subdwarf binary LAMOST J065816.72+094343.1

Astronomy & Astrophysics
Context. Massive short-period binaries involving hot subdwarf stars (sdO/Bs) are rare but very relevant to constraining pathways for binary star evolution.
Mattig F., Barlow B. N., Liu D., Dorsch M., Geier S., Pritzkuleit M., Dawson H., Wang B., Schaffenroth V., Kupfer T., Derbyshire C., Barocci-Faul S.   +11 more
doaj   +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

Se-ResNet+SVM model: an effective method of searching for hot subdwarfs from LAMOST

, 2022
In this paper, we apply the feature-integration idea to fuse the abstract features extracted by Se-ResNet with experience features into hybrid features and input the hybrid features to the Support Vector Machine (SVM) to classify Hot subdwarfs.
Tianmin, Wu, xiaoming, Kong, Zhenping, Yi, Yatao, Zhang, Meng, Liu, Zhenxin, Lei, Zhongding, Cheng, Yude, Bu   +7 more
core