A Photoionization Model Study of NGC 7027

1989 ◽  
pp. 224-224 ◽  
Author(s):  
Ruth B. Gruenwald ◽  
Daniel Pequignot
Keyword(s):  
Model Study ◽  
Ngc 7027 ◽  
Photoionization Model

scholarly journals A Photoionization Model Study of NGC 7027

1989 ◽  
Vol 131 ◽  
pp. 224-224
Author(s):  
Ruth B. Gruenwald ◽  
Daniel Pequignot
Keyword(s):  
Emission Spectrum ◽  
Atomic Physics ◽  
Physical Characteristics ◽  
Model Study ◽  
Ngc 7027 ◽  
Exceptional Object ◽  
Photoionization Model

The physical characteristics of NGC7027 and the nature of the observations available make it an exceptional object to check the ability of steady photoionization modelling to correctly predict the emission spectrum of nebulae. After a decade of atomic physics and observation improvements, a complete updating of the analysis performed by Pequignot et al (1978) (Astron. Astrophys. 63, 313) is in order.

scholarly journals The Nature of GQ Mus As Depicted From Photoionization Models of the Shell

1996 ◽  
Vol 158 ◽  
pp. 305-306
Author(s):  
D. Péquignot ◽  
C. Morisset
Keyword(s):  
Ionizing Radiation ◽  
Emission Line ◽  
Effective Temperature ◽  
Time Variation ◽  
Line Spectrum ◽  
Thermal Source ◽  
Model Study ◽  
Emission Line Spectrum ◽  
Photoionization Model

Consequences of a detailed photoionization model study of the shell ejected by Nova Mus 1983 (GQ Mus) are presented for the period from early 1983 to 1990 (Morisset & Péquignot 1996).The drastic time variation of the emission line spectrum, including the transition from a nebular to a coronal stage in 1986, can be quantitatively understood in terms of a smooth evolution of both the expanding shell and the hot thermal source. This transition is due to a decrease of the shell density with time, and not to an increase of the source effective temperature.The model shell comprises two components so that not all directions become optically thin to ionizing radiation simultaneously. The range of density and geometrical thickness of the emitting material is of the order of a factor 2.

Social Desirability in Personality Inventories

2014 ◽  
Vol 35 (3) ◽  
pp. 144-157 ◽  
Author(s):  
Martin Bäckström ◽  
Fredrik Björklund
Keyword(s):  
Social Desirability ◽  
Big Five ◽  
Work Performance ◽  
Factor Model ◽  
Five Factor Model ◽  
Peer Ratings ◽  
Personality Inventories ◽  
Model Study ◽  
The Difference ◽  
New Variables

The difference between evaluatively loaded and evaluatively neutralized five-factor inventory items was used to create new variables, one for each factor in the five-factor model. Study 1 showed that these variables can be represented in terms of a general evaluative factor which is related to social desirability measures and indicated that the factor may equally well be represented as separate from the Big Five as superordinate to them. Study 2 revealed an evaluative factor in self-ratings and peer ratings of the Big Five, but the evaluative factor in self-reports did not correlate with such a factor in ratings by peers. In Study 3 the evaluative factor contributed above the Big Five in predicting work performance, indicating a substance component. The results are discussed in relation to measurement issues and self-serving biases.

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