Results 71 to 80 of about 212,521 (235)
, 2016 We explore the photometrically variable central stars of the planetary nebulae HaTr 4 and Hf 2-2. Both have been classified as close binary star systems previously based on their light curves alone.
T. Hillwig +5 more
semanticscholar +1 more source
THE CHANDRA PLANETARY NEBULA SURVEY (ChanPlaNS). II. X-RAY EMISSION FROM COMPACT PLANETARY NEBULAE [PDF]
, 2014 We present results from the most recent set of observations obtained as part of the Chandra X-ray observatory Planetary Nebula Survey (ChanPlaNS), the first comprehensive X-ray survey of planetary nebulae (PNe) in the solar neighborhood (i.e., within ∼1 ...
M. Freeman +75 more
semanticscholar +1 more source
SATELLITE: Application to Planetary Nebulae IFU Data
Galaxies, 2022 The integral field unit (IFU) spectroscopic view of extended ionized nebulae, such as planetary nebulae (PNe), H II regions, and galaxies, has changed the approach of studying these objects, providing a simultaneous characterization in both spatial ...
Stavros Akras +5 more
doaj +1 more source
Transactions of the Institute of British Geographers, EarlyView.Abstract Based on recently opened multilingual archives, this paper addresses relationally three transnational cases of early networking for critical and radical geography that took place in different countries and languages between the 1970s and the 1980s.
Federico Ferretti
wiley +1 more source
A hydrodynamical study of multiple‐shell planetary nebulae [PDF]
, 2014 We present the result of a study on the expansion properties and internal kinematics of round/elliptical planetary nebulae of the Milky Way disk, the halo, and of the globular cluster M 15.
D. Schoênberner +8 more
semanticscholar +1 more source
Chemical Abundances and Dust in Planetary Nebulae in the Galactic Bulge [PDF]
ApJ (2008) 680, 1206, 2008 We present mid-infrared Spitzer spectra of eleven planetary nebulae in the Galactic Bulge. We derive argon, neon, sulfur, and oxygen abundances for them using mainly infrared line fluxes combined with some optical line fluxes from the literature. Due to the high extinction toward the Bulge, the infrared spectra allow us to determine abundances for ...
arxiv +1 more source
(Re)wilding London: Fabric, politics, and aesthetics
Transactions of the Institute of British Geographers, EarlyView.Short Abstract Rewilding has become established as a new mode of nature conservation. Until recently, cities and the urban were neglected by rewilding discourse; the idea of urban rewilding seen as oxymoronic. Of late, however, there has been a shift, with growing enthusiasm amongst metropolitan authorities, civil society, and citizens in major cities.
Jonathon Turnbull +2 more
wiley +1 more source
Chemical abundances in Galactic planetary nebulae with Spitzer spectra [PDF]
, 2014 We present new low-resolution (R ∼ 800) optical spectra of 22 Galactic planetary nebulae (PNe) with Spitzer spectra. These data are combined with recent optical spectroscopic data available in the literature to construct representative samples of compact
D. A. García-Hernández, S. Górny
semanticscholar +1 more source
The Evidence for a Binary origin of the Young Planetary Nebula HB 12 [PDF]
Astron.J.131:3040-3046,2006, 2006 The young planetary nebulae play an important role in stellar evolution when intermediate- to low-mass stars (0.8 $\sim$ 8 M$_\odot$) evolve from the proto-planetary nebulae phase to the planetary nebulae phase. Many young planetary nebulae display distinct bipolar structures as they evolve away from the proto-planetary nebulae phase.
arxiv +1 more source
Rapid Communications in Mass Spectrometry, Volume 39, Issue 13, 15 July 2025.ABSTRACT Rationale Matrix effects by secondary ion mass spectrometry (SIMS) are empirically corrected by calibration using matrix‐matched reference materials. However, conventional parametric regression cannot estimate the prediction uncertainty to account for the difference in compositions of new data and reference materials. Applying Gaussian process
Keita Itano +5 more
wiley +1 more source