Results 61 to 70 of about 205,774 (262)
SINGLE ROTATING STARS AND THE FORMATION OF BIPOLAR PLANETARY NEBULA [PDF]
, 2014 We have computed new stellar evolution models that include the effects of rotation and magnetic torques under different hypotheses. The goal is to test whether a single star can sustain the rotational velocities needed in the envelope for ...
G. García-Segura +5 more
semanticscholar +1 more source
Planetary nebulae: a key tool to reconstruct the evolutionary history of stars
Frontiers in Astronomy and Space SciencesPlanetary nebulae, among the most fascinating objects in the sky, have been extensively investigated in the past years, because their study provides important information on the low and intermediate mass stellar populations of the host environment ...
Paolo Ventura +3 more
doaj +1 more source
Discovery of a planetary nebula surrounding the symbiotic star DT Serpentis
, 2013 We report the discovery of a planetary nebula centered on the poorly studied symbiotic binary star DT Ser. In a few other symbiotic stars spatially resolved nebulae have been discovered: however, only one of them might be a genuine planetary nebula ...
Baldinelli, L. +4 more
core +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
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
, 2008 We present new radial velocity measurements of 586 stars in a one-degree field centered on the open cluster M46, and the planetary nebula NGC 2438 located within a nuclear radius of the cluster.
Aller +45 more
core +1 more source
Decisions Under Radical Uncertainty: The Role of Volitional Liminality in Radical Innovation
Journal of Product Innovation Management, EarlyView.ABSTRACT Academic Summary Radical innovation management can be understood as an organizational practice that enacts distant futures, which are open‐ended and unknowable. Such radical innovation endeavors are thus characterized by radical uncertainty, where possible futures are not only quantitatively but qualitatively different from the present, and ...
José Antonio Rosa +2 more
wiley +1 more source
The Astrophysical JournalWe apply an imaging analysis technique to study the spatial distribution of the X-ray spectral hardness across the hot bubble of planetary nebula BD+30°3639.
Rodolfo Montez Jr.
doaj +1 more source
Binary Interactions, High-Speed Outflows and Dusty Disks during the AGB-To-PN Transition
Galaxies, 2018 It is widely believed that the dramatic transformation of the spherical outflows of AGB stars into the extreme aspherical geometries seen during the planetary nebula (PN) phase is linked to binarity and driven by the associated production of fast jets ...
Raghvendra Sahai
doaj +1 more source
Morphology and Composition of the Helix Nebula [PDF]
, 1999 We present new narrow-band filter imagery in H-alpha and [N II] 6584 along with UV and optical spectrophotometry measurements from 1200 to 9600 Angstroms of NGC 7293, the Helix Nebula, a nearby, photogenic planetary nebula of large diameter and low ...
Bachiller R. +23 more
core +2 more sources