T Tauri stars: Physical parameters and evolutionary status
نویسندگان
چکیده
منابع مشابه
The evolutionary status of activity-selected solar-type stars and of T Tauri stars as derived from Hipparcos parallaxes: evidence for long-lived T Tauri disks?
We have used the Hipparcos parallaxes to study the evolutionary status of a sample of stars with spectral types from late F to M0 (hereafter “solar-type stars”), selected on the basis of their activity, mainly from Einstein-based surveys. The parallaxes have been used to place the objects in the H-R diagram, determining their age by comparison with theoretical evolutionary tracks and observatio...
متن کاملMass Accretion onto T Tauri Stars
It is now accepted that accretion onto classical T Tauri stars is controlled by the stellar magnetosphere, yet to date most accretion models have assumed that their magnetic fields are dipolar. By considering a simple steady state accretion model with both dipolar and complex magnetic fields we find a correlation between mass accretion rate and stellar mass of the form Ṁ ∝ Mα ∗ , with our resul...
متن کاملMagnetic Braking of T Tauri Stars
We construct models for the rotation rates of T Tauri stars whose spin is regulated by magnetic linkage between the star and a surrounding accretion disc. Our models utilise a time-dependent disc code to follow the accretion process and include the eeects of pre-main-sequence stellar evolution. We nd that the initial disc mass controls the evolution of the star-disc system. For suuciently massi...
متن کاملX-ray emission from T Tauri stars
We have modelled the X-ray emission of T Tauri stars assuming that they have isothermal, magnetically-confined coronae. These coronae extend outwards until either the pressure of the hot coronal gas overcomes the magnetic field, or, if the corona interacts with a disk before this happens, by the action of the disk itself. This work is motivated by the results of the Chandra Orion Ultradeep Proj...
متن کاملThe nature of isolated T Tauri stars
We present the results of a search for young stellar objects around the two isolated T Tauri stars (TTSs) TW Hya and CoD−29◦8887. From the spectroscopic properties of these two objects, it is obvious that they are T Tauri stars, although they are not associated with a star-forming region as it is the case for most of the known TTSs. Especially TW Hya is the only classical TTS that is not locate...
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ژورنال
عنوان ژورنال: Astronomy Letters
سال: 2016
ISSN: 1063-7737,1562-6873
DOI: 10.1134/s1063773716050030