منابع مشابه
Electron temperature fluctuations in NGC 346
Context. The existence and origin of large spatial temperature fluctuations in H ii regions and planetary nebulae are assumed to explain the differences between the heavy element abundances inferred from collisionally excited and recombination lines, although this interpretation remains significantly controversial. Aims. We investigate the spatial variation in electron temperature inside NGC 34...
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We present new H-band echelle spectra, obtained with the NIRSPEC spectrograph at Keck II, for the massive star cluster " B " in the nearby dwarf irregular galaxy NGC 1569. From spectral synthesis and equivalent width measurements we obtain abundances and abundance patterns. We derive an Fe abundance of [Fe/H]=−0.63 ± 0.08, a super-solar [α/Fe] abundance ratio of +0.31 ± 0.09, and an O abundance...
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We present emission line mapping of the strongly barred galaxy NGC 1530 obtained using Fabry-Pérot interferometry in Hα, at significantly enhanced angular resolution compared with previously published studies. The main point of the work is to examine in detail the non-circular components of the velocity field of the gas, presumably induced by the strongly non-axisymmetric gravitational potentia...
متن کاملThe Neutron Star Census
The paucity of old isolated accreting neutron stars in ROSAT observations is used to derive a lower limit on the mean velocity of neutron stars at birth. The secular evolution of the population is simulated following the paths of a statistical sample of stars for different values of the initial kick velocity, drawn from an isotropic Gaussian distribution with mean velocity 0 ≤ V ≤ 550 km s −1. ...
متن کاملThe VLT - FLAMES Survey of Massive Stars : Observations centered on the Magellanic Cloud clusters NGC 330 , NGC 346 , NGC 2004 , and the N 11 region ⋆ ⋆ ⋆
We present new observations of 470 stars using the Fibre Large Array Multi-Element Spectrograph (FLAMES) instrument in fields centered on the clusters NGC 330 and NGC 346 in the Small Magellanic Cloud (SMC), and NGC 2004 and the N11 region in the Large Magellanic Cloud (LMC). A further 14 stars were observed in the N11 and NGC 330 fields using the Ultraviolet and Visual Echelle Spectrograph (UV...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2020
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201936921