Generalized Lyapunov exponents indicators in Hamiltonian dynamics: An application to a double star system

1993 ◽  
Vol 56 (1-2) ◽  
pp. 315-322 ◽  
Author(s):  
E. Lohinger ◽  
C. Froeschl� ◽  
R. Dvorak
Keyword(s):  
Lyapunov Exponents ◽  
Hamiltonian Dynamics ◽  
Double Star ◽  
Star System ◽  
Generalized Lyapunov Exponents

scholarly journals The Variable Shell Star HR 5999

1977 ◽  
Vol 42 ◽  
pp. 137-143
Author(s):  
P.S. Thé ◽  
H.R.E. Tjin A Djie
Keyword(s):  
Spectral Type ◽  
Proper Motion ◽  
Main Sequence ◽  
Angular Separation ◽  
Double Star ◽  
Star System ◽  
Spectroscopic Observations ◽  
Photometric Observations ◽  
Shell Star ◽  
Hydrogen Lines

From spectroscopic observations Bessell and Eggen (1972) (hereafter called BE) have detected that HR 5999 (erroneously named HR 6000 by BE) is a shell star of spectral type A7 III-IV with hydrogen lines in emission. Photometric observations show subsequently that HR 5999 varies in brightness up to about 1 mag semiregularly with a period of about 1 month. Eggen (1975) believes that HR 5999 forms a pre-main sequence object.With HR 6000, the star HR 5999 forms a visual double star system named Δ199; HR 5999 is the southern component. The angular separation is about 45”. BE show that these stars have a common proper motion, and are, therefore, believed to form a physical pair.

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