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 a study of available Hubble Space Telescope (HST) spectroscopic and imaging observations of the low ionization nuclear emission line region (LINER) galaxy NGC 1052. The WFPC2 imagery clearly differentiates extended nebular Hα emission from that of the compact core. Faint Object Spectrograph (FOS) observations provide a full set of optical and UV data (1200-6800Å). These spectral data...
متن کاملThree - dimensional photoionization modelling of the planetary nebula NGC 3918
The three-dimensional Monte Carlo photoionization code Mocassin has been applied to construct a realistic model of the planetary nebula NGC 3918. Three different geometric models were tried, the first being the biconical density distribution already used by Clegg et al. (1987). In this model the nebula is approximated by a biconical structure of enhanced density, embedded in a lower density sph...
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...
متن کامل329-346 Search moves
People engage in multiple types of information-seeking strategies within an information-seeking episode. The objective of this pilot study is to investigate search moves and tactics made by end-users when searching for visual information. The pilot study involves 5 undergraduate students from the Department of Journalism and Media Studies at Rutgers University using the AccuNet/AP Photo Archive...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2002
ISSN: 0004-637X,1538-4357
DOI: 10.1086/324286