0000000001286999

AUTHOR

Laura Venuti

showing 2 related works from this author

UV variability and accretion dynamics in the young open cluster NGC 2264

2015

We explore UV and optical variability signatures for several hundred members of NGC 2264 (3 Myr). We performed simultaneous u- and r-band monitoring over two full weeks with CFHT/MegaCam. About 750 young stars are probed; 40% of them are accreting. Statistically distinct variability properties are observed for accreting and non-accreting cluster members. The accretors exhibit a significantly higher level of variability than the non-accretors, especially in the UV. The amount of u-band variability correlates statistically with UV excess in disk-bearing objects, which suggests that accretion and star-disk interaction are the main sources of variability. Cool magnetic spots, several hundred de…

AccretionAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsSettore FIS/05 - Astronomia E AstrofisicaStars: low-maAstrophysics::Solar and Stellar Astrophysicsaccretion diskAstrophysics::Galaxy AstrophysicsSolar and Stellar Astrophysics (astro-ph.SR)Stars: variables: T TauriPhysicsPhotosphereHerbig Ae/BeAstronomy and AstrophysicsAstronomy and AstrophysicUltraviolet: starAccretion (astrophysics)StarsWavelengthAmplitudeAstrophysics - Solar and Stellar AstrophysicsSpace and Planetary ScienceOpen clusters and associations: individual: NGC 2264Stars: pre-main sequenceAstrophysics::Earth and Planetary AstrophysicsOpen cluster
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Time Resolved X-Ray Spectral Analysis of Class II YSOs in NGC 2264 During Optical Dips and Bursts

2016

Pre-Main Sequence stars are variable sources. The main mechanisms responsible for their variability are variable extinction, unsteady accretion, and rotational modulation of both hot and dark photospheric spots and X-ray active regions. In stars with disks this variability is thus related to the morphology of the inner circumstellar region (<0.1 AU) and that of photosphere and corona, all impossible to be spatially resolved with present day techniques. This has been the main motivations of the Coordinated Synoptic Investigation of NGC2264, a set of simultaneous observations of NGC2264 with 15 different telescopes. We analyze the X-ray spectral properties of stars with disks extracted du…

Settore FIS/05 - Astronomia E AstrofisicaAccretion accretion disks Stars: pre-main sequence Stars: variables: T Tauri Herbig Ae/BeAstrophysics::High Energy Astrophysical PhenomenaAstrophysics::Solar and Stellar Astrophysicspre-main sequence stars; variability protoplanetary disks; accretionAstrophysics::Earth and Planetary AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics::Galaxy Astrophysics
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