Results 21 to 30 of about 199 (140)
New observations and asteroseismic analysis of the subdwarf B pulsator PG 1219+534
Open Astronomy, 2018 We present a new asteroseismic modeling of the hot B subdwarf (sdB) pulsator PG 1219+534, based on a 3- month campaign with the Mont4K/Kuiper combination at Mt Bigelow (Arizona) and on updated atmospheric parameters from high S/N low and medium ...
Van Grootel Valérie +5 more
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Spectroscopic and Photometric Analysis of the HW Vir Star PTF1 J011339.09+225739.1
Open Astronomy, 2018 HW Vir systems are rare eclipsing binary systems including a subdwarf B star (sdB) with a faint companion, mostly M-dwarfs. Up to now, 19 HW Vir systems have been published, three of them with substellar companions. We report the spectroscopic as well as
Wolz Maximilian +9 more
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Annual Review of Astronomy and Astrophysics, 2009 Hot subdwarf stars (sdBs, sdOs) are core helium-burning stars at the blue end of the horizontal branch or have evolved even beyond that stage. They are found in all Galactic stellar populations and are sufficiently common to account for the UV-upturn of early-type galaxies.
openaire +2 more sources
Analysis of F and G Subdwarfs. III. an Abundance Analysis of the Subdwarf μ Cassiopeia [PDF]
The Astrophysical Journal, 1968 Model atmosphere abundance analysis of subdwarf mu Cassiopeia by measuring spectral line widths and comparing with ...
openaire +2 more sources
The OB-type subdwarf HD 149382 and the nature of the subdwarf B stars
The Astrophysical Journal, 1975 High-dispersion spectra and monochromatic continuum measures of the subdwarf OB star HD 149382 have been obtained and analyzed to yield the atmospheric parameters T)=40,000 K, log g=5.8. Helium is deficient by a factor 10 compared to Population I. Sulfur is the only element, other than hydrogen and helium, observed in the blue spectrum of this object ...
B. Baschek, J. Norris
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A Slowly Pulsating Run‐Away B Star at High Galactic Latitude Ejected From a Spiral Arm
Astronomische Nachrichten, Volume 346, Issue 5, June 2025.ABSTRACT We report the discovery of the young B6 V run‐away star LAMOST J083323.18 + 430825.4, 2.5 kpc above the Galactic plane. Its atmospheric parameters and chemical composition are determined from LAMOST spectra, indicating normal composition. Effective temperature (Teff$$ {T}_{\mathrm{eff}} $$ = 14,500$$ \mathrm{14,500} $$ K) and gravity (logg ...
Ulrich Heber +3 more
wiley +1 more source
The Astrophysical JournalWe report the results of a spectroscopic survey of candidate T subdwarfs identified by the Backyard Worlds: Planet 9 program. Near-infrared spectra of 31 sources with red J − W2 colors and large J -band reduced proper motions show varying signatures of ...
Adam J. Burgasser +36 more
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A Series of Subdwarf Atmospheres.
The Astrophysical Journal Supplement Series, 1961 A series of model stellar atmospheres, representing stars of low heavy- element content, is tabulated. Characteristics of the continua of the models, including (U,B,V) colors and bolometric corrections, are discussed and compared with observations. (auth)
Thomas L. Swihart, David Fischel
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Se-ResNet+SVM Model: An Effective Method of Searching for Hot Subdwarfs from LAMOST
The Astrophysical Journal Supplement SeriesThis paper presents a robust neural network approach for identifying hot subdwarfs. Our method leveraged the Squeeze-and-Excitation Residual Network to extract abstract features, which were combined with experience features to create hybrid features ...
Zhongding Cheng +9 more
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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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