Search results for "stars : pre-main-sequence"

showing 2 items of 2 documents

New Pre-Main Sequence Candidates in the Taurus-Auriga Star Forming Region

2007

Aims. We have studied the X-ray source population of the Taurus Molecular Cloud (TMC) to search for new members of the Taurus-Auriga star forming region. Methods. Candidate members have been selected among the X-ray sources detected in 24 fields of the XMM-Newton Extended Survey of the Taurus Molecular Cloud, having an IR counterpart in the 2MASS catalog, based on color-magnitude and color-color diagrams. Their X-ray spectral properties have been compared with those of known members and other X-ray sources in the same fields but without a NIR counterpart. A search for flare-like variability in the time series of all new candidates and the analysis of the X-ray spectra of the brightest candi…

010504 meteorology & atmospheric sciencesStellar massAstrophysics::High Energy Astrophysical PhenomenaAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsGalaxy : open clusters and associations : individual : Taurus Molecular Cloud01 natural sciences[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]stars : activitystars : pre-main-sequence0103 physical sciencesstars : luminosity function mass functionAstrophysics::Solar and Stellar Astrophysics010303 astronomy & astrophysicsLuminosity functionAstrophysics::Galaxy Astrophysics0105 earth and related environmental sciencesPhysicsAURIGAMolecular cloudAstronomyAstronomy and AstrophysicsLight curveStarsStar clusterSpace and Planetary Science[PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]X-rays : starAstrophysics::Earth and Planetary Astrophysicsstars : coronaeOpen cluster
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High Resolution X-ray Spectroscopy of Pre-Main-Sequence Stars: TWA 5 and PZ Tel

2004

We report on the analysis of high resolution X-ray spectra of two pre-main-sequence stars: TWA 5 (observed with XMM-Newton) and PZ Telescopii (observed with Chandra/HETGS). TWA 5 is a classical T Tauri star in the TW Hydrae association while PZ Tel is a rapidly rotating weak-lined T Tauri star in the beta-Pictoris moving group. For both stars we have reconstructed the emission measure distribution and derived the coronal abundances to check for possible patterns of the abundances related to the first ionization potential of the various elements. We have also derived estimates of the plasma density from the analysis of the He-like triplets. We compare the characteristics of our targets with …

Settore FIS/05 - Astronomia E Astrofisicastars : pre-main-sequenceAstrophysics::High Energy Astrophysical PhenomenaX-rays : starsAstrophysics (astro-ph)Astrophysics::Solar and Stellar AstrophysicsFOS: Physical sciencesAstrophysics::Earth and Planetary AstrophysicsAstrophysicspre-main-sequence; techniques : spectroscopic; X-rays : stars [stars]techniques : spectroscopicAstrophysics::Galaxy Astrophysics
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