Results 41 to 50 of about 130 (117)
Atmospheric parameters of field subdwarf B stars
The Astrophysical Journal, 1994 High signal-to-noise ratio optical spectrophotometry of a sample of field 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 ...
Rex A. Saffer +3 more
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EXOTIME: searching for planets around pulsating subdwarf B stars [PDF]
Astrophysics and Space Science, 2010 Contribution to: The Fourth Meeting on Hot Subdwarf Stars and Related Objects, 20 - 24 July 2009, Shanghai, China, published 03/2010 by Ap&SS (Open access publication).
Schuh, Sonja +29 more
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Characterizing Orbital Parameters of Hot Subdwarf Binaries with Multiple Spectroscopic Surveys
The Astrophysical JournalHot subdwarfs (HSDs) provide critical insights into the physical mechanisms governing binary evolution. In this work, we conduct a systematic analysis of 157 HSDs, selected from Gaia Early Data Release 3 and characterized using multi-survey spectroscopic
Xinlin Zhao +7 more
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, 2018 Subdwarf B (sdB) stars are horizontal branch stars with thin hydrogen envelopes surrounding a half solar mass helium core. Following their classification in 1966 by Greenstein, little progress was made in understanding these apparently common stars. When pulsators were discovered by Kilkenny et al.
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Are there Two Populations of subdwarf B Stars Visible in Kinematic Samples? [PDF]
Symposium - International Astronomical Union, 1995 The discussions about stellar populations and their spatial distribution can be best advanced by studies of special and well defined star types. The study of subdwarf B stars provides great promise: it is relatively easy both to find sdB stars and to determine their physical parameters.
K. S. De Boer +7 more
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Rotation Signatures of TESS B-type Stars: Enlarging the Sample
The Astrophysical JournalMassive stars are essential for the evolution and chemical enrichment of the universe, yet their structure and evolution remain poorly understood. This study aims to expand the sample of B-type stars with known rotation periods by analyzing NASA’s ...
J. P. S. Campelo +10 more
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X-ray emission from hot subdwarfs with compact companions
EPJ Web of Conferences, 2013 We review the X-ray observations of hot subdwarf stars. While no X-ray emission has been detected yet from binaries containing B-type subdwarfs, interesting results have been obtained in the case of the two luminous O-type subdwarfs HD 49798 and BD + 37°
Esposito P. +3 more
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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.
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Hot subdwarf stars from the Hamburg Quasar Survey
Astronomy & AstrophysicsHot subluminous stars (subdwarf B&O; sdB, sdO) are evolved low mass stars originating from red giants that lost their envelope almost entirely. The multitude of observed phenomena imply that several pathways may form hot subdwarfs, most involving close ...
Heber U. +6 more
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The Astrophysical JournalHot subdwarf (sdB) stars in binary systems with main-sequence (MS) companions provide valuable insights into mass transfer and envelope ejection processes in binary evolution.
Jiangdan Li +7 more
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