منابع مشابه
A New System of Faint Near-Infrared Standard Stars
A new grid of 65 faint near-infrared standard stars is presented. They are spread around the sky, lie between 10th and 12th mag at K, and are measured to precisions better than 0.005 mag in the J, H, K and Ks bands; the latter is a medium-band modiied K. A secondary list of red stars suitable for determining color transformations between photometric systems is also presented.
متن کاملAn excess of massive stars in the local 30 Doradus starburst.
The 30 Doradus star-forming region in the Large Magellanic Cloud is a nearby analog of large star-formation events in the distant universe. We determined the recent formation history and the initial mass function (IMF) of massive stars in 30 Doradus on the basis of spectroscopic observations of 247 stars more massive than 15 solar masses ([Formula: see text]). The main episode of massive star f...
متن کاملThe ionising cluster of 30 Doradus ⋆
On the basis of multislit spectroscopy of 180 stars in the ionising cluster of 30 Doradus we present reliable radial velocities for 55 stars. We calculate a radial velocity dispersion of ∼ 35 km s −1 for the cluster and we analyse the possible influence of spectroscopic binaries in this rather large velocity dispersion. We use numerical simulations to show that the observations are consistent w...
متن کاملSupersonic Water Masers in 30 Doradus
We report on extremely high velocity molecular gas, up to −80 km s relative to the ambient medium, in the giant star-formation complex 30 Doradus in the Large Magellanic Cloud (LMC), as observed in new 22 GHz H2O 616 → 523 maser emission spectra obtained with the Mopra radio telescope. The masers may trace the velocities of protostars, and the observed morphology and kinematics indicate that cu...
متن کاملTurbulent planetary nebulae around [ WC ] – type stars ⋆
Through a high-resolution spectroscopic survey, we analyze the velocity field of 16 planetary nebulae with [WC]or wels-type nuclei in comparison with 8 nebulae having other central star types. We found spectral evidence for finite turbulent velocities in [WC]-type planetary nebulae superimposed on an essentially constant expansion velocity pattern. The nebulae around O-type stars show no eviden...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1986
ISSN: 0074-1809
DOI: 10.1017/s0074180900149289