Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..66..309s&link_type=abstract
Astrophysics and Space Science, vol. 66, no. 2, Dec. 1979, p. 309-318.
Astronomy and Astrophysics
Astrophysics
6
Dynamic Stability, Secular Variations, Stellar Luminosity, Variable Stars, Data Reduction, Least Squares Method, Orbital Mechanics, Statistical Analysis, Stellar Motions
Scientific paper
All the observational data of 12DD Lacertae obtained have been examined to find a clue to the problem of secular variation or pulsational stability. From the statistical consideration it is concluded that the mean brightness is almost constant within small irregular variation of a few hundredth of a magnitude and the gamma-velocity also shows small irregular variation of a few km/sec during more than a half century; but a result from the least-squares solution is also discussed. No periodicity of the variation in mean magnitude and gamma-velocity has been detected, and an expectation that the small variation in the gamma-velocity might be caused by orbital motion is not confirmed.
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