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New Stars (new + star)

Distribution by Scientific Domains
Physics and Astronomy75%

Selected Abstracts

New Stars and telescopes: Nova research in the last four centuries

ASTRONOMISCHE NACHRICHTEN, Issue 6 2009
H.W. Duerbeck
Abstract This article gives a brief overview of 400 years of research in the field of novae and related stars. Important objects, first applications of various observing techniques, and early ideas of the interpretation of phenomena are listed. Also, the historical evolution of the classification of novae and related stars (supernovae, dwarf novae), as well as their use as distance indicators is discussed (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Economic geography: the rising star of the social sciences

OXONOMICS, Issue 1-2 2007
Ashby H. B. Monk
The study of economic geography is concerned with explaining the spatial configuration of economic activity; considering the extent of the world's economic growth over the last half century, the relevance of the discipline is clear. Economic geography is undeniably a ,new star' in the social sciences, a status confirmed by the success of the Journal of Economic Geography. Under the surface, however, economists and geographers disagree frequently about ontology and methodology. If used to enhance and improve ideas, these divisions will ultimately lead to better research and even greater success. [source]

Formation of blue compact dwarf galaxies from merging and interacting gas-rich dwarfs

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: LETTERS (ELECTRONIC), Issue 1 2008
Kenji Bekki
ABSTRACT We present the results of numerical simulations which show the formation of blue compact dwarf (BCD) galaxies from merging between very gas-rich dwarfs with extended H i gas discs. We show that dwarf,dwarf merging can trigger central starbursts and form massive compact cores dominated by young stellar populations. We also show that the pre-existing old stellar components in merger precursor dwarfs can become diffuse low surface brightness components after merging. The compact cores dominated by younger stellar populations and embedded in more diffusely distributed older ones can be morphologically classified as BCDs. Since new stars can be formed from gas transferred from the outer part of the extended gas discs of merger precursors, new stars can be very metal-poor ([Fe/H] < ,1). Owing to very high gaseous pressure exceeding 105 kB (where kB is the Boltzmann constant) during merging, compact star clusters can be formed in forming BCDs. The BCDs formed from merging can still have extended H i gas discs surrounding their blue compact cores. We discuss whether tidal interaction of gas-rich dwarfs without merging can also form BCDs. [source]

Elemental abundance analyses with DAO spectrograms: XXX.

ASTRONOMISCHE NACHRICHTEN, Issue 4 2010
2 Ceti (B9 III), 21 Aquilae (B8 II-III), Aquilae (B5 III), Delphini (A2V), The middle B through early A stars
Abstract This series of high quality elemental abundance analyses of mostly main-sequence band normal and peculiar B, A, and F stars defines their properties and provides data for the comparison with the analyses of somewhat similar stars and with theoretical predictions. Most use high dispersion and high S/N (, 200) spectrograms obtained with CCD detectors at the long camera of the Coudé spectrograph of the 1.22-m Dominion Astrophysical Observatory telescope. Here we reanalyze 21 Aql with better quality spectra and increase the number of stars consistently analyzed in the spectral range B5 to A2 by analyzing three new stars for this series. In the early A stars the normal and non-mCP stars have abundances with overlapping ranges. But more stars are needed especially in the B5 to B9 range. ,2 Cet on average has a solar composition with a few abundances outside the solar range while both 21 Aql and , Aql have abundances marginally less than solar. The abundances of , Del are greater than solar with a few elements such as Ca being less than solar. It is an Am star (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]