Search results for "Multiple stars"

showing 2 items of 2 documents

XMM spectroscopy of TWA 5

2006

We present results of X-ray spectroscopy for TWA 5, a member of the young TW Hydrae association, observed with XMM-Newton. TWA 5 is a multiple system which shows H{alpha} emission, a signature typical of classical T Tauri stars, but no infrared excess. From this analysis of the RGS and EPIC spectra, we have derived the emission measure distribution vs. temperature of the X-ray emitting plasma, its abundances, and the electron density.

Astrophysics and AstronomyAstrophysics::High Energy Astrophysical PhenomenaPhysicsAstrophysics::Cosmology and Extragalactic AstrophysicsX-ray sourcesobservational astronomyPre main sequence starsX ray sourcesStellar AstronomyAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Earth and Planetary AstrophysicsPre-main sequence starsMultiple starsNatural SciencescosmologyAstrophysics::Galaxy AstrophysicsSpectroscopy
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KELT-9b radial velocity curve

2019

In the framework of the GAPS project, we observed the planet-hosting star KELT-9 (A-type star, vsini~110km/s) with the HARPS-N spectrograph at the Telescopio Nazionale Galileo. In this work we analyse the spectra and the extracted radial velocities, to constrain the physical parameters of the system and to detect the planetary atmosphere of KELT-9b. We extracted from the high-resolution optical spectra the mean stellar line profiles with an analysis based on the Least Square Deconvolution technique. Then, we computed the stellar radial velocities with a method optimized for fast rotators, by fitting the mean stellar line profile with a purely rotational profile instead of using a Gaussian f…

observational astronomyRadial velocityAstrophysics and AstronomyExoplanet AstronomyStellar AstronomyExoplanetsPhysicsAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Earth and Planetary AstrophysicsMultiple starsNatural SciencesSpectroscopy
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