Search results for "Low-mass"

showing 2 items of 12 documents

Mapping accretion and its variability in the young open cluster NGC 2264: A study based on u-band photometry

2014

We aim at characterizing the accretion properties of several hundred members of the star-forming cluster NGC 2264 (3 Myr). We performed a deep u,g,r,i mapping and a simultaneous u+r monitoring of the region with CFHT/MegaCam in order to directly probe the accretion process from UV excess measurements. Photometric properties and stellar parameters are determined homogeneously for about 750 monitored young objects, spanning the mass range 0.1-2 Mo. About 40% are classical (accreting) T Tauri stars, based on various diagnostics (H_alpha, UV and IR excesses). The remaining non-accreting members define the (photospheric+chromospheric) reference UV emission level over which flux excess is detecte…

Stellar massAstrophysics::High Energy Astrophysical PhenomenaStars: formationPopulationFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsPhotometry (optics)Accretion rateAccretion accretion diskStars: low-maAstrophysics::Solar and Stellar AstrophysicseducationAstrophysics::Galaxy AstrophysicsSolar and Stellar Astrophysics (astro-ph.SR)Physicseducation.field_of_studyDetection thresholdAstronomy and AstrophysicsAstronomy and AstrophysicUltraviolet: starAccretion (astrophysics)T Tauri starAstrophysics - Solar and Stellar Astrophysicsindividual: NGC 2264; Stars: formation; Stars: low-mass; Stars: pre-main sequence; Ultraviolet: stars; Astronomy and Astrophysics; Space and Planetary Science [Accretion accretion disks; Open clusters and associations]Space and Planetary ScienceOpen clusters and associations: individual: NGC 2264Stars: pre-main sequenceAstrophysics::Earth and Planetary AstrophysicsOpen cluster
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PLANETS AROUND LOW-MASS STARS AND STELLAR ACTIVITY EFFECTS

In the last years the field of exoplanet research has focused its interest in M dwarfs. These stars have became the favourite targets in radial velocity surveys, specially when looking for small planets in the habitable zones of their parent stars. Not only for being the M dwarfs the most common objects in our Galaxy also because the Doppler signals due to small planets orbiting around them are larger and more easily detectable than those around FGK stars. However, stellar magnetic activity and rotation affect the measured radial velocities as surface inhomogeneities rotating with the stellar surface can cause periodic changes in the spectral line centroid. Disentangle these stellar activit…

activity - Stars: low-mass - Techniques: radial velocities - planetary systems [Stars]Stars: activity - Stars: low-mass - Techniques: radial velocities - planetary systems
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