Results 61 to 70 of about 4,354 (212)
Spectral energy distributions and colours of hot subluminous stars
Open Astronomy, 2018 Photometric surveys at optical, ultraviolet, and infrared wavelengths provide ever-growing datasets as major surveys proceed. Colour-colour diagrams are useful tools to identify classes of star and provide large samples.
Heber Ulrich +2 more
doaj +1 more source
Primeval very low-mass stars and brown dwarfs. I. Six new L subdwarfs, classification and atmospheric properties [PDF]
, 2016 We have conducted a search for L subdwarf candidates within the photometric catalogues of the UKIRT Infrared Deep Sky Survey and Sloan Digital Sky Survey.
Z. Zhang +14 more
semanticscholar +1 more source
Chemical fingerprints of He-sdO stars
Open Astronomy, 2018 The chemical composition of helium-rich hot subluminous O stars plays an important role to understand and model their formation history. We present a spectroscopic analysis of four He-sdO stars,CD-31° 4800, [CW83] 0904- 02, LSS 1274 and LS IV +10° 9. The
Schindewolf Markus +5 more
doaj +1 more source
CCD Parallaxes for 309 Late-type Dwarfs and Subdwarfs [PDF]
, 2017 New, updated, and/or revised CCD parallaxes determined with the Strand Astrometric Reflector at the Naval Observatory Flagstaff Station are presented. Included are results for 309 late-type dwarf and subdwarf stars observed over the 30+ years that the ...
C. Dahn +19 more
semanticscholar +1 more source
Summary of Eighth Meeting on Hot Subdwarfs and Related Objects
Open Astronomy, 2017 Subjects discussed during the Eighth Meeting on Hot Subdwarfs and Related Objects are summarised. In particular, a succinct presentation is given of challenges to stellar evolution arising from recent observations.
Lynas-Gray Anthony Eugene
doaj +1 more source
X-rays from hot subdwarfs [PDF]
Advances in Space Research, 2016 Review paper to be published in Advances in Space Research (special issue on "X-ray emission from hot stars and their winds")
MEREGHETTI, Sandro, LA PALOMBARA, NICOLA
openaire +3 more sources
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
doaj +1 more source
Open Astronomy, 2017 Evolved stars with a helium core can be formed by non-conservative mass exchange interaction with a companion or by strong mass loss. Their masses are smaller than 0.5 M⊙. In the database of the Sloan Digital Sky Survey (SDSS), there are several thousand
Pelisoli Ingrid +2 more
doaj +1 more source
An additional pulsating mode (7.35 mHz) and pulsations timing variations of PG 1613+426
Open Astronomy, 2017 We present the detection of an additional pulsation mode (7.35 mHz) of a subdwarf B star, PG 1613+426, and periodic Observed minus Calculated (O-C) variations for two existing pulsations. PG 1613+426 is near the hot end of the sdB instability strip.
Otani Tomomi +5 more
doaj +1 more source
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
openaire +1 more source