Results 211 to 220 of about 1,114,432 (235)

Symbiotic Stars in the Context of Binary Evolution and Metallicity

Astrophysics and Space Science, 2006
A brief description of symbiotic binary stars is given, followed by a discussion on their evolutionary status. It is evident that different subtypes of symbiotic stars belong to the different Galactic populations. Discussion of some properties of the hot and cool components of symbiotic stars is presented.
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Creation of Neutral Disk-Like Zone Around the Active Hot Star in Symbiotic Binaries [PDF]

Proceedings of the International Astronomical Union, 2011
AbstractWe investigated the ionization structure of symbiotic binaries during their active phases. We found that a neutral disk-like zone around the hot star can be created as a result of its enhanced wind and fast, 200 - 300 km s−1, rotation. Calculated column densities of the neutral hydrogen atoms throughout the neutral zone and emission measures of
Augustin Skopal
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Discovery of a Redshifted X-Ray Emission Line in the Symbiotic Neutron Star Binary 4U 1700+24 [PDF]

Astronomy and Astrophysics, 2005
We present the spectral analysis of an XMM-Newton observation of the X-ray binary 4U 1700+24, performed during an outburst in August 2002. The EPIC-PN spectrum above 1 keV can be modeled by a blackbody plus Comptonization model, as in previous observations.
Tiziana Di Salvo, Andrea Tiengo, Duncan K Galloway   +2 more
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Related Binaries, Including Symbiotic Stars

Highlights of Astronomy, 1986
In the context of the Joint Discussion, it is clear that by “long period binaries” we understand the system of ∊ Aurigae and theζAurigae systems. The question is, then, how to determine which systems could be considered “related” to those long period ones.
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CGCS 6306, Another X-Ray-Emitting Asymptotic Giant Branch Star Confirmed to Be a Symbiotic Binary

Astronomy and Astrophysics
Context. A number of asymptotic giant branch (AGB) stars are known to exhibit UV excess and/or X-ray emission. These have been considered signposts of a hot white dwarf (WD) companion in a symbiotic system (SySt), but AGB stars are so bright that they easily outshine these companions, thus hampering their detection at optical wavelengths.
Jaroslav Merc, Roberto Ortiz, Jesus A Toala   +2 more
exaly   +4 more sources

Outburst Activity Driven by Evolved Pulsating Star in the Symbiotic Binary AG Dra

EAS Publications Series, 2015
The symbiotic system AG Dra regularly undergoes quiescent and active stages which consist of the series of individual outbursts. The period analysis of new and historical photometric data, as well as radial velocities, confirmed the presence of the two periods.
R. Gális, L. Hric, L. Leedjärv
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Accretion Disks in Symbiotic Stars and their Relationship to Cataclysmic Binaries

2000
The symbiotic stars were discovered in the early 1900’s by Cannon and Merrill as late-type giants with surprisingly strong emission lines from H I, He I and He II. Infrared photometry has confirmed the presence of K or M giants in most symbiotics (Allen 1982), while IUE spectra show intense emission lines superimposed on a strong continuous source ...
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High-dispersion spectroscopy of the symbiotic star AX Per: A binary model with rapid mass accretion

Astrophysics and Space Science, 1988
Results of high-dispersion spectroscopy (∼10 A mm−1) of the symbiotic star AX Per carried out in the years from 1979 to 1987 are reported. The emission line [FeVII] 6086 consists of a narrow and a broad component; the radial velocity of the narrow one varies according to the photometric period 681.6 days.
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Analysis of Supernova Ia Progenitor Systems: White Dwarf-Main Sequence Binaries, Cataclysmic Variables, and the Symbiotic Stars LIN 358 and SMC N73

2020
Type Ia supernovae (SNe Ia) occur when a white dwarf (WD) in a binary becomes unstable and explodes, but the exact path to this event is unknown. One possible channel, the single degenerate scenario, is that the WD accretes mass from its companion until the WD reaches the Chandrasekhar limit (1.4 solar masses) and explodes.
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Spectroscopic and Photometric Analysis of Symbiotic Candidates – I. Ten Candidates on Classical Symbiotic Stars

Monthly Notices of the Royal Astronomical Society, 2021
Jaroslav Merc, Marek Wolf, Rudolf Galis
exaly