Discovery of rapid spectral variability in the Ap star χ Psc

Autor:	S. G. Aliev, N. Z. Ismailov
Rok vydání:	2000
Předmět:	Physics Amplitude Space and Planetary Science Temporal resolution Stellar atmosphere Astronomy and Astrophysics Astrophysics Star (graph theory)
Zdroj:	Astronomy Reports. 44:738-744
ISSN:	1562-6881 1063-7729
DOI:	10.1134/1.1320499
Popis:	Analysis of spectrograms with high spectral and temporal resolution taken during four nights in 1998 has revealed spectral-line variability of the peculiar star HD 220825 with a quasi-period of $$0\mathop d\limits_. 0.12 \pm 0\mathop d\limits_. 0005$$ . The observed variations have the form of wavelike oscillations whose amplitude decreases or increases during the observations. The CrII, SiII, and TiII lines exhibit the strongest variability. The scale lengths of peculiar regions are estimated to be from 5000 to 15000 km based on data for different lines. The results provide evidence for the presence of real wavelike dynamical processes at the stellar surface that change the physical conditions in the stellar atmosphere.
Databáze:	OpenAIRE
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