Results 131 to 140 of about 7,790 (232)
Diffusion in hot subdwarf progenitors from the common envelope channel
Open Astronomy, 2017 Diffusion of elements in the atmosphere of a star can drastically affect its surface composition, sometimes leading to unusual mixtures. These chemically peculiar stars can be identified fromthe presence of unusual lines in their spectra.
Byrne Conor M. +3 more
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Spectroscopic classification of red high proper motion objects in the Southern Sky
, 2005 We present the results of spectroscopic follow-up observations for a sample of 71 red objects with high proper motions in the range 0.08-1.14 arcsec/yr as detected using APM and SSS measurements of multi-epoch photographic Schmidt plates.
Ibata, R. +5 more
core +1 more source
News on the X-ray emission from hot subdwarf stars
Open Astronomy, 2017 In latest years, the high sensitivity of the instruments on-board the XMM-Newton and Chandra satellites allowed us to explore the properties of the X-ray emission from hot subdwarf stars.
Palombara Nicola La, Mereghetti Sandro
doaj +1 more source
Discovery of magnetic fields in hot subdwarfs
, 2004 We present initial results of a project to measure mean longitudinal magnetic fields in a group of sdB/OB/O stars. The project was inspired by the discovery of three super-metal-rich sdOB stars, each having metals (e.g. Ti, V) enhanced by factors of 10^3
Aznar Cuadrado +23 more
core +2 more sources
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
openaire +1 more source
Envelope loss of RGB/AGB stars and the formation of hot subdwarfs
EPJ Web of Conferences, 2013 Low mass stars may lose their envelopes in the first giant branch (RGB) or the asymptotic giant branch (AGB) via envelope ejection (i.e. superwind). The envelope loss of AGB stars leads to the formation of carbon-oxygen (CO) white dwarfs (WDs), while the
Chen X., Han Z.
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Discovery of [CLC][ITAL]p[/ITAL][/CLC]-Mode Instabilities in the Hot Subdwarf B Star PG 1047+003 [PDF]
, 1997 M. Billères +6 more
openalex +1 more source
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
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Atomic diffusion in the atmosphere of Feige 86
Open Astronomy, 2017 We have revisited the ultraviolet and optical spectra of the blue horizontal branch star Feige 86. The new analysis finds the star cooler and more compact than previously determined. The IUE spectrum of Feige 86 holds numerous unidentified spectral lines
Németh Péter
doaj +1 more source
Fiducial Stellar Population Sequences for the VJKs Photometric System
, 2010 We have obtained broad-band near-infrared photometry for seven Galactic star clusters (M92, M15, M13, M5, NGC1851, M71 and NGC6791) using the WIRCam wide-field imager on the Canada-France-Hawaii Telescope, supplemented by images of NGC1851 taken with ...
Anthony-Twarog +27 more
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