scholarly journals Observations of Mass Loss and Circumstellar Matter around Cool Carbon Stars

2000 ◽  
Vol 177 ◽  
pp. 367-375 ◽  
Author(s):  
T. Lloyd Evans
Keyword(s):  
Circumstellar Matter ◽  
Dust Formation ◽  
Infrared Photometry ◽  
Carbon Stars ◽  
Absorption Bands ◽  
Long Period ◽  
Resonance Emission ◽  
Long Period Variables ◽  
Circumstellar Gas ◽  
Semiregular Variable

Spectroscopy and infrared photometry of carbon stars show three distinct forms of circumstellar matter. IRAS 12311-3509 probably has an edge-on disk and the spectrum is dominated by resonance emission from atoms and molecules in the vicinity. The long-period variables V Hya and R Lep are undergoing deep fadings, apparently caused by dust formation around the star, while variable emission from circumstellar gas is seen. The semiregular variable T Mus showed absorption bands from very cool material during an unusual episode in 1994.

Dynamical Models of Circumstellar Dust Shells around Long-Period Variables

2000 ◽  
Vol 177 ◽  
pp. 377-384
Author(s):  
A. J. Fleischer ◽  
J. M. Winters ◽  
E. Sedlmayr
Keyword(s):  
Complex Interaction ◽  
Time Dependent ◽  
Circumstellar Dust ◽  
Dust Formation ◽  
Dynamical Models ◽  
Dust Shells ◽  
Long Period ◽  
Detailed Treatment ◽  
Long Period Variables ◽  
Dust Complex

We present dynamical models of circumstellar dust shells around long-period variables which include time-dependent hydrodynamics and a detailed treatment of dust formation, growth and evaporation. Important effects due to the complex interaction between the dynamics of the pulsating atmosphere and the dust complex are demonstrated.

scholarly journals Dynamical Modeling of Circumstellar Outflows

1999 ◽  
Vol 191 ◽  
pp. 187-194 ◽  
Author(s):  
Axel J. Fleischer ◽  
Jan Martin Winters ◽  
Erwin Sedlmayr
Keyword(s):  
Complex Interaction ◽  
Time Dependent ◽  
Circumstellar Dust ◽  
Dust Formation ◽  
Dynamical Models ◽  
Dynamical Modeling ◽  
Long Period ◽  
Dynamical Approach ◽  
Long Period Variables ◽  
Dust Complex

We review dynamical models of circumstellar dust shells around long-period variables which include time-dependent hydrodynamics and a detailed treatment of dust formation, growth and evaporation. Important effects caused by the complex interaction between the dynamics of the pulsating atmosphere and the dust complex which only can be revealed in the dynamical approach are summarized. Special emphasis is given to the treatment of the dust and gas opacity.

scholarly journals Dust formation in winds of long-period variables

2003 ◽  
Vol 400 (3) ◽  
pp. 981-992 ◽  
Author(s):  
A. C. Andersen ◽  
S. Höfner ◽  
R. Gautschy-Loidl
Keyword(s):  
Dust Formation ◽  
Long Period ◽  
Long Period Variables

scholarly journals Dust Formation and the Doubly-Periodic Variable Stars

1995 ◽  
Vol 155 ◽  
pp. 196-197
Author(s):  
T. Lloyd Evans
Keyword(s):  
Dust Cloud ◽  
Variable Stars ◽  
Emission Lines ◽  
Circumstellar Dust ◽  
Dust Formation ◽  
Circumstellar Envelope ◽  
Pulsation Period ◽  
Deep Minimum ◽  
Resonance Emission ◽  
Semiregular Variable

AbstractThe doubly-periodic semiregular variable V Hydrae became redder and developed resonance emission lines and bands during the 1992-94 deep minimum, which therefore resulted from the production of a circumstellar dust cloud. This removes the need to postulate a secondary pulsation period, ten times as long as the main pulsation period, in the stellar as opposed to circumstellar envelope.

scholarly journals Investigation of Long-Period Variables in the Catalina Southern Catalog: New Carbon Stars and False Objects

Astrophysics ◽  
2019 ◽  
Vol 62 (2) ◽  
pp. 202-209
Author(s):  
N. Mauron ◽  
K. S. Gigoyan ◽  
K. K. Gigoyan ◽  
L. P. A. Maurin ◽  
T. R. Kendall
Keyword(s):  
Carbon Stars ◽  
Long Period ◽  
Long Period Variables

Infrared colours of selected long period variables

1994 ◽  
Vol 217 (1-2) ◽  
pp. 145-147
Author(s):  
P. Le Sidaner ◽  
T. Le Bertre
Keyword(s):  
Long Period ◽  
Long Period Variables
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