Search results for "Exocomet"

showing 2 items of 2 documents

Viewing the Sun as an X-ray star

2003

The Sun is the late-type star we can study with the highest level of detail. In the interpretation of stellar data, therefore, it is often assumed that the physical processes of the coronae of late-type stars are similar to those of the solar corona, i.e. the "solar-stellar analogy". In order to investigate the validity of this assumption, we have started a program to study systematically the Sun as an X-ray star. Our program aims to explore how far the solar model can be applied to other stars. In this paper we review the results obtained from these studies and, in particular, we discuss the variability of a star identical to the Sun during its cycle, the contribution of different coronal …

G-type main-sequence starAtmospheric ScienceTELESCOPEAstrophysics::High Energy Astrophysical PhenomenaK-type main-sequence starAerospace EngineeringAstrophysicsCORONAESettore FIS/05 - Astronomia E AstrofisicaAstrophysics::Solar and Stellar AstrophysicsTEMPERATUREAstrophysics::Galaxy AstrophysicsPhysicsStandard solar modelFlare starAstronomyAstronomy and AstrophysicsREGIONST Tauri starGeophysicsSpace and Planetary ScienceStellar mass lossPhysics::Space PhysicsGeneral Earth and Planetary SciencesAstrophysics::Earth and Planetary AstrophysicsEMISSION MEASURESuperflareExocomet
researchProduct

A comparison between the X-ray variable Sun and solar-like main sequence stars

2003

We analyze the time variations of the solar X-ray luminosity observed with Yohkoh/SXT with the aim to compare the X-ray variability of the Sun with that of the other solar-like main sequence stars as function of the relevant time scales. Since the observational set-up and strategies used to observe the Sun dier from those used for the other stars, we have explored the solar X-ray variability properties starting from the available solar data, trying to reproduce the observational procedures adopted for the stars. We have quantified how the solar variability amplitude increases with the explored time scales and found that solar-cycle variability can contribute at most up to 60% to the spread …

PhysicsSolar massK-type main-sequence starFlare starAstronomyAstronomy and AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsT Tauri starSpace and Planetary SciencePhysics::Space PhysicsAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Earth and Planetary AstrophysicsAstrophysics::Galaxy AstrophysicsMain sequenceSuperflareExocometLuminosity function (astronomy)Astronomy & Astrophysics
researchProduct