Search results for " binaries: eclipsing"

showing 2 items of 2 documents

A study of the B and Be star population in the field of the LMC open cluster NGC 2004 with VLT-FLAMES

2005

Observations of hot stars belonging to the young cluster LMC-NGC2004 and its surrounding region have been obtained with the VLT-GIRAFFE facilities in MEDUSA mode. 25 Be stars were discovered; the proportion of Be stars compared to B-type stars is found to be of the same order in the LMC and in the Galaxy fields. 23 hot stars were discovered as spectroscopic binaries (SB1 and SB2), 5 of these are found to be eclipsing systems from the MACHO database, with periods of a few days. About 75% of the spectra in our sample are polluted by hydrogen (Halpha and Hgamma), [SII] and [NII] nebular lines. These lines are typical of HII regions. They could be associated with patchy nebulosities with a bi-m…

Be starPopulationFOS: Physical sciencesAstrophysicsAstrophysicsUNESCO::ASTRONOMÍA Y ASTROFÍSICA01 natural sciencesbinaries: eclipsing [Stars]Spectral lineStars: early-type[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]ISM: nebular lines and bandsMagellanic Clouds [Galaxies]early-type [Stars]Stars: binaries: spectroscopic0103 physical sciencesCluster (physics)education010303 astronomy & astrophysicsStars: binaries: eclipsingPhysicseducation.field_of_study[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]010308 nuclear & particles physicsStars: emission-lineAstrophysics (astro-ph)Stars: early-type ; Stars: emission-line Be ; Galaxies: Magellanic Clouds ; Stars: binaries: spectroscopic ; Stars: binaries: eclipsing ; ISM: lines and bandsAstronomy and AstrophysicsBeGalaxies: Magellanic CloudsGalaxyRadial velocityStarsbinaries: spectroscopic [Stars]Space and Planetary Scienceemission-line Be [Stars][SDU]Sciences of the Universe [physics]lines and bands [ISM]:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]Open cluster
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Chandra study of the eclipsing M dwarf binary, YY Gem

2012

The eclipsing M dwarf binary system, YY Gem, was observed using Chandra covering 140 ks (2Prot) in total, split into two even exposures separated by 0.76 d (0.94 Prot). The system was extremely active: three energetic flares were observed over the course of these observations. The flaring and non-flaring states of the system are analysed in this paper. The activity level increased between the first and second observations even during the quiescent (non-flaring) phases. An analysis of the dynamics of the X-ray-emitting plasma suggests that both components are significantly active. Contemporaneous Hα spectra also suggest that both components show similar levels of activity. The primary star i…

techniques: spectroscopic binaries: eclipsing stars: coronae stars: flare stars: magnetic field X-rays: starsspectroscopic binaries: eclipsing stars: coronae stars: flare stars: magnetic field X-rays: stars [techniques]Settore FIS/05 - Astronomia E Astrofisica
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