SIMBAD references

1999A&A...342..167S - Astronomy and Astrophysics, volume 342, 167-172 (1999/2-1)

On the period history of χ Cygni.

STERKEN C., BROENS E. and KOEN C.

Abstract (from CDS):

We discuss the light variability of the Mira variable χ Cygni, present a homogeneous set of times of minimum and maximum light since its discovery date in 1686, and analyse the variations of the pulsation period. There is a substantial cycle-to-cycle variation in the pulsations (standard error ∼6.5d) with quite strong evidence for a linearly increasing period. Quasi-cyclic patterns in the O-C diagrams are visible, but there is no compelling evidence that these apparent cyclic period changes are real since the residuals left after fitting a linear period increase plus intrinsic period scatter have properties consistent with being white noise. The Lombard frequency domain test for a changing period applied to the residuals also gives unconvincing significance levels. The low gradient of the luminosity change with period is compatible with the star undergoing a rise in luminosity when H shell-burning takes over.

Abstract Copyright:

Journal keyword(s): stars: individual: HD 187796 - stars: oscillations - stars: AGB and post-AGB

Simbad objects: 5

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2020.08.03-20:11:52

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