منابع مشابه
New neighbours . I . 13 new companions to nearby M dwarfs ⋆
We present preliminary results of a long-term radialvelocity search for companions to nearby M dwarfs, started in September 95. The observed sample is volume-limited, and defined by the 127 northern (δ > −16◦) M dwarfs listed in the Gliese and Jahreiss (CNS3) catalogue with d≤9 pc and V≤15. Observations are obtained with the ELODIE spectrograph on the 1.93-m telescope of the Observatoire de Hau...
متن کاملMetallicity determination of M dwarfs
Lindgren, S. 2017. Metallicity determination of M dwarfs. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1587. 46 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-513-0127-3. M dwarfs constitute around 70% of all stars in the local Galaxy. Their multitude together with their long main-sequence lifetimes make them important for studies...
متن کاملFragmentation of protoplanetary disks around M-dwarfs
We investigate the conditions required for planet formation via gravitational instability (GI) and protoplanetary disk (PPD) fragmentation around M-dwarfs. Using a suite of 64 SPH simulations with 106 particles, the parameter space of disk mass, temperature, and radius is explored, bracketing reasonable values based on theory and observation. Our model consists of an equilibrium, gaseous, and l...
متن کاملObservations of M , L , and T Dwarfs
We present the first mid-infrared spectra of brown dwarfs, together with observations of a low-mass star. Our targets are the M3.5 dwarf GJ 1001A, the L8 dwarf DENIS-P J0255−4700, and the T1/T6 binary system ǫ Indi Ba/Bb. As expected, the mid-infrared spectral morphology of these objects changes rapidly with spectral class due to the changes in atmospheric chemistry resulting from their differi...
متن کاملM dwarfs: effective temperatures, radii and metallicities
We empirically determine effective temperatures and bolometric luminosities for a large sample of nearby M dwarfs, for which high accuracy optical and infrared photometry is available. We introduce a new technique which exploits the flux ratio in different bands as a proxy of both effective temperature and metallicity. Our temperature scale for late type dwarfs extends well below 3000K (almost ...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2009
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921310009853