Results 91 to 100 of about 212,521 (235)
The Acceleration of the Nebular Shells in Planetary Nebulae in the Milky Way Bulge [PDF]
, 2008 We present a systematic study of line widths in the [\ion{O}{3}]$\lambda$5007 and H$\alpha$ lines for a sample of 86 planetary nebulae in the Milky Way bulge based upon spectroscopy obtained at the \facility{Observatorio Astron\'omico Nacional in the Sierra San Pedro M\'artir (OAN-SPM)} using the Manchester Echelle Spectrograph.
arxiv +1 more source
Soil Use and Management, Volume 41, Issue 2, April 2025.ABSTRACT Organic fertilisation of orchard soils can influence soil organic matter (SOM), nutrient cycling, greenhouse gas emissions and the overall sustainability of the farming systems. This study investigated the long‐term effects of organic citrus farming on soil properties in a semi‐arid region of Ceará, Brazil.
David Gabriel Campos Pereira +4 more
wiley +1 more source
Weak magnetic fields in central stars of planetary nebulae [PDF]
, 2014 It is not yet clear whether magnetic fields play an essential role in shaping planetary nebulae (PNe), or whether stellar rotation alone and/or a close binary companion can account for the variety of the observed nebular morphologies.
M. Steffen +11 more
semanticscholar +1 more source
Observations of planetary nebulae in the Galactic Bulge [PDF]
arXiv, 1999 High quality spectrophotometric observations of 30 Planetary Nebulae in the Galactic Bulge have been made. Accurate reddenings, plasma parameters, and abundances of He,O,N,S,Ar,Cl are derived. We find the abundances of O,S,Ar in the Planetary Nebulae in the Galactic Bulge to be comparable with the abundances of the Planetary Nebulae in the Disk, high
arxiv
Biogeographic Patterns of Iranian Lepidoptera: A Framework for Conservation
Diversity and Distributions, Volume 31, Issue 3, March 2025.ABSTRACT Aim The contact zone of three zoogeographic realms, the Palearctic, Saharo‐Arabian and Oriental, is an evolutionary cradle of high species richness and endemism in Iran. In this study, we investigate statistically inferred bioregions of Lepidoptera in this region.
Sajad Noori +6 more
wiley +1 more source
A search for magnetic fields on central stars in planetary nebulae [PDF]
, 2014 Departamento de Astrofisica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, SpainReceived To be inserted later, accepted To be inserted laterABSTRACTContext.One of the possible mechanisms responsible for the panoply of shapes in planetary nebulae
F. Leone +4 more
semanticscholar +1 more source
Spectroscopy of Planetary Nebulae with Herschel: A Beginners Guide
Galaxies, 2018 A brief overview of the Herschel Space Telescope PACS and SPIRE spectrographs is given, pointing out aspects of working with the data products that should be considered by anyone using them.
Katrina Exter
doaj +1 more source
HI and CO Observations of Circumnebular Envelopes of Planetary Nebulae [PDF]
, 1994 21cm spectral-line and continuum observations of ten compact planetary nebulae have been made with the Very Large Array. Circumnebular atomic hydrogen is identified in the planetary nebulae SwSt1, M3-35, and possibly in Hu2-1. The possibility of an inverse correlation between the optical depth of circumnebular atomic hydrogen and the linear radius of ...
arxiv +1 more source
2020 Nier Prize to Thomas Kruijer
Meteoritics &Planetary Science, EarlyView.
Thorsten Kleine
wiley +1 more source
Meteoritics &Planetary Science, Volume 60, Issue 3, Page 464-483, March 2025.Abstract Xenoliths in carbonaceous chondrites include lithologies that are unrepresented in the meteorite record and so are a rich source of information on asteroid diversity. Cold Bokkeveld is a CM2 regolith breccia that contains both hydrous and anhydrous lithic clasts. Here, we describe a hydrous clast with a fine‐grained rim.
Martin R. Lee +3 more
wiley +1 more source