scholarly journals On the relationship between the H2 emission and the physical structure of planetary nebulae

2012 ◽  
Vol 429 (2) ◽  
pp. 973-986 ◽  
Author(s):  
R. A. Marquez-Lugo ◽  
G. Ramos-Larios ◽  
M. A. Guerrero ◽  
R. Vázquez
Keyword(s):  
Planetary Nebulae ◽  
Physical Structure ◽  
The Relationship

Physical Structure of Planetary Nebulae. I. The Owl Nebula

2003 ◽  
Vol 125 (6) ◽  
pp. 3213-3221 ◽  
Author(s):  
Martn A. Guerrero ◽  
You-Hua Chu ◽  
Arturo Manchado ◽  
Karen B. Kwitter
Keyword(s):  
Planetary Nebulae ◽  
Physical Structure

scholarly journals Physical Structure of Planetary Nebulae. III. The Large and Evolved NGC 1360

2004 ◽  
Vol 128 (4) ◽  
pp. 1711-1715 ◽  
Author(s):  
Daniel B. Goldman ◽  
Martín A. Guerrero ◽  
You-Hua Chu ◽  
Robert A. Gruendl
Keyword(s):  
Planetary Nebulae ◽  
Physical Structure

scholarly journals Axiomatic design and virtual verification for blackbody cavity sensor

2019 ◽  
Vol 301 ◽  
pp. 00022 ◽  
Author(s):  
Jiangfeng Cheng ◽  
Chia-Feng Juang ◽  
Weihai Chen ◽  
Guohui Mei
Keyword(s):  
Temperature Measurement ◽  
Measurement Accuracy ◽  
Axiomatic Design ◽  
Physical Structure ◽  
Model Material ◽  
Experimental Result ◽  
Functional Requirements ◽  
Geometry Model ◽  
Blackbody Cavity ◽  
The Relationship

The blackbody cavity sensor for continuous temperature measurement of molten steel has been widely used in steel industry. However, due to the closed bottom of the inner tube, the temperature measurement accuracy is seriously affected. It’s urgent to redesign and improve the sensor, which involves multidisciplinary knowledge, including materials, heat and flow science. This paper first clarifies the relationship between sensor functional requirements and various physical structure parameters from the perspective of axiomatic design. On this basis, the virtual models of the blackbody cavity sensor are established, including geometry model, multi-physical field model, material physical properties and boundary conditions. And then through comparison between experiment and simulation, it is found that for the temperature measurement accuracy, the deviations between the simulation and the actual experimental result are less than 1.5℃. This verifies the accuracy of the virtual model.

scholarly journals Recent HST Surveys of Planetary Nebulae in the Magellanic Clouds

2003 ◽  
Vol 209 ◽  
pp. 575-576
Author(s):  
Richard A. Shaw ◽  
Letizia Stanghellini ◽  
Max Mutchler ◽  
Bruce Balick ◽  
Stacy Palen ◽  
...  
Keyword(s):  
Galactic Plane ◽  
Planetary Nebulae ◽  
Magellanic Clouds ◽  
The Past ◽  
High Resolution Images ◽  
Formation And Evolution ◽  
The Relationship ◽  
Physical Quantities ◽  
Dust Absorption ◽  
Active Investigation

The study of the formation and evolution of planetary nebulae (PNs) has been a subject of active investigation for several decades. In the past 15 years the relationship between nebular morphology and nebular/stellar evolution has been investigated in some detail. Although important insights have been gained, the connection between PN formation and even basic morphological features of the evolving nebula is far from clear. One of the most vexing problems to overcome is the difficulty of obtaining, at least for Galactic PNs where statistical distances must be adopted, reliable dimensions, ages, luminosities, and other physical quantities that are essential for understanding the evolutionary state of individual nebulae. Our emphasis of late has been to obtain high-resolution images of a large sample of PNs in the Magellanic Clouds, where uncertainties in the distances are minimal and selection effects due to, e. g., dust absorption in the Galactic plane do not apply.

scholarly journals The N/O-Core Mass Relation in Planetary Nebulae

1989 ◽  
Vol 106 ◽  
pp. 235-235
Author(s):  
J.B. Kaler ◽  
R.A. Shaw ◽  
K.B. Kwitter
Keyword(s):  
Mass Loss ◽  
Planetary Nebulae ◽  
Nitrogen Enrichment ◽  
Mass Relation ◽  
Core Mass ◽  
Giant Stars ◽  
Rate Of Increase ◽  
The Relationship

We define the relationship between nitrogen enrichment in planetary nebulae and the mass of the nucleus. N/O remains flat at about 0.3 (double solar) from a core mass of 0.55 M(sun) to 0.8 M(sun), whereupon it rises quickly to values that approach and may exceed 2. The rate of increase of N/O with core mass exceeds that predicted for giant stars by standard dredge-up and mass-loss theories.

scholarly journals The physical structure of planetary nebulae around sdO stars: Abell 36, DeHt 2, and RWT 152★

2014 ◽  
Vol 446 (1) ◽  
pp. 317-329 ◽  
Author(s):  
A. Aller ◽  
L. F. Miranda ◽  
L. Olguín ◽  
R. Vázquez ◽  
P. F. Guillén ◽  
...  
Keyword(s):  
Planetary Nebulae ◽  
Physical Structure

scholarly journals High-Resolution Spectroscopy of the Planetary Nebulae PM 1–242, PM 1–318 and PM 1–322

2010 ◽  
Vol 27 (2) ◽  
pp. 199-202 ◽  
Author(s):  
L. F. Miranda ◽  
R. Vázquez ◽  
M. A. Guerrero ◽  
C. B. Pereira ◽  
E. Iñiguez-Garín
Keyword(s):  
High Resolution ◽  
Planetary Nebula ◽  
Planetary Nebulae ◽  
Central Star ◽  
Brightness Distribution ◽  
Physical Structure ◽  
High Resolution Spectroscopy

AbstractWe have recently confirmed the planetary nebula (PN) nature of PM 1–242, PM 1–318 and PM 1–322. Here we present high-resolution long-slit spectra of these three PNe in order to analyze their internal kinematics and to investigate their physical structure. PM 1–242 is a tilted ring and not an elliptical PN as suggested by direct images. The object is probably related to ring-like PNe and shows an unusual pointsymmetric brightness distribution in the ring. PM 1–318 is a pole-on elliptical PN, instead of a circular one as suggested by direct images. PM 1–322 is spatially unresolved and its spectrum shows large differences between the forbidden lines and Hα profiles, with the latter showing a double-peaked profile and relatively extended wings (FWZI ~325 km s−1). These properties are found in other PNe that are suspected to host a symbiotic central star.

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