Results 41 to 50 of about 27,938 (255)
THE EMISSION-LINE DUSTY OBJECT IRAS 07080+0605, A LESS-EVOLVED EXAMPLE OF THE RED RECTANGLE
Odessa Astronomical Publications, 2020 The all-sky survey conducted by the InfraRed Astronomical Satellite (IRAS) in the 1980’s discovered many objects with infrared excesses whose nature has not been explored until recently.
S A. Khokhlov +13 more
doaj +1 more source
Detecting Planets in Planetary Nebulae [PDF]
, 1998 We examine the possibility of detecting signatures of surviving Uranus-Neptune-like planets inside planetary nebulae. Planets that are not too close to the stars, orbital separation larger than about 5 AU, are likely to survive the entire evolution of ...
Soker, Noam
core +2 more sources
Spectral analysis of the binary nucleus of the planetary nebula Hen 2-428 – first results
Open Astronomy, 2018 Identifying progenitor systems for the double-degenerate scenario is crucial to check the reliability of type Ia supernovae as cosmological standard candles. Santander-Garcia et al. (2015) claimed that Hen 2-428 has a doubledegenerate core whose combined
Finch Nicolle L. +6 more
doaj +1 more source
The magnetic field of the proto-planetary nebula candidate IRAS 19296+2227
, 2008 Context: Magnetic fields are thought to be one of the possible mechanisms responsible for shaping the generally spherical outflow of evolved stars into often aspherical planetary nebulae.
Bains +28 more
core +1 more source
Symposium - International Astronomical Union, 1997 We review the properties of proto-planetary nebulae, highlighting the advances in our quantitative knowledge of these objects. The discussion focuses on the chemistry and morphology of their circumstellar envelopes and the chemistry and variability of their central stars.
openaire +3 more sources
Photoionization modeling of the Galactic planetary nebulae Abell 39 and NGC 7027
, 2011 We estimate distances to the spherical planetary nebula Abell 39 and the bipolar planetary nebula NGC 7027 by interpolating from a wide grid of photoionization models using the 3-D code, MOCASSIN.
Ashkbiz Danehkar +6 more
core +1 more source
Business ethics, law and zemiology: The criminology of social and environmental harm
Business Ethics, the Environment &Responsibility, EarlyView.Abstract This speculative paper introduces zemiology, an extension of radical criminology which explores why many ‘crimes’ are not ‘illegal’ by focussing on the problem of ‘social harm’. Zemiology insists that we should begin with social or environmental problems, and not allow their foreclosure by the distraction of whether a particular practice is ...
Robin Klimecki, Martin Parker
wiley +1 more source
Planetary Nebulae Formation [PDF]
Highlights of Astronomy, 1980 It is a well accepted idea that Planetary Nebulae ( P.N. ) formation is due to mass ejection from red giant envelopes.According to the original model, as was proposed by Roxburgh and Lucy in 1967, and established about a year later by Paczynski and Ziolkowski (1968), red giant envelopes become dynamically unstable above a certain boundary luminosity ...
Z. Barkat, Y. Tuchman, N. Sack
openaire +2 more sources
X-ray Shaping of Planetary Nebulae
Galaxies, 2018 The stellar winds of the central stars of planetary nebulae play an essential role in the shaping of planetary nebulae. In the interacting stellar winds model, the fast stellar wind injects energy and momentum, which are transferred to the nebular ...
Martín A. Guerrero
doaj +1 more source
Evaluating Investment in Space Programs: A Case for Theoretical Pluralism
Financial Accountability &Management, EarlyView.ABSTRACT A perennial question repeatedly asked since the early Mercury (USA) and Salyut (then Soviet Union) space programs has been variations on the theme of “how can the cost of space exploration be justified?” This question—which in broad terms constitutes the research question considered in this paper—continues to be directed toward space agencies ...
Basil P. Tucker, Hank C. Alewine
wiley +1 more source