Transition Region Emission from Very Low Mass Stars
نویسندگان
چکیده
منابع مشابه
Mass loss and very low-metallicity stars
Mass loss plays a dominant role in the evolution of massive stars at solar metallicity. After discussing different mass loss mechanisms and their metallicity dependence, we present the possibility of strong mass loss at very low metallicity. Our models at Z = 10−8 show that stars more massive than about 60 M⊙ may lose a significant fraction of their initial mass in the red supergiant phase. Thi...
متن کاملAccurate masses of very low mass stars
We present very accurate individual masses (1.2% relative accuracy) for the two components of Gl 570BC, an interferometric and double-lined spectroscopic binary system. They were obtained from new high accuracy radial velocity and angular separation measurements, analysed together with previously published measurements. From those data we determine a much improved orbit through a simultaneous l...
متن کاملAccurate masses of very low mass stars : II The very low mass triple system Gl 866 ⋆
ASTRONOMY AND ASTROPHYSICS Accurate masses of very low mass stars: II The very low mass triple system Gl 866 Abstract. We present very accurate orbital parameters and mass measurements (2.4% accuracy) for the well known very low mass triple system Gl 866. We obtain first orbital elements for the short-period orbit and greatly improve the long period orbit. All three stars have masses close to 0...
متن کاملEmission line diagnostics for accretion and outflows in young very low-mass stars and brown dwarfs
We discuss accretion and outflow properties of three very low-mass young stellar objects based on broad-band mid-resolution X-Shooter/VLT spectra. Our targets (FUTauA, 2M1207-39, and Par-Lup3-4) have spectral types between M5 and M8, ages between 1Myr and ∼ 10Myr, and are known to be accreting from previous studies. The final objective of our project is the determination of mass outflow to accr...
متن کاملRotation periods for very low mass stars in Praesepe
We investigate the rotation periods of fully convective very low mass stars (VLM, M < 0.3M⊙), with the aim to derive empirical constraints for the spindown due to magnetically driven stellar winds. Our analysis is based on a new sample of rotation periods in the main-sequence cluster Praesepe (age 600Myr). From photometric lightcurves obtained with the Isaac Newton Telescope, we measure rotatio...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2003
ISSN: 0004-637X,1538-4357
DOI: 10.1086/375630