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Titolo: Stability of pulsation of the double-mode high-amplitude delta Scuti star AE Ursae Majoris
Autore: Pocs, MD; Szeidl, B;
- Indirizzi:
- Hungarian Acad Sci, Konkoly Observ Budapest, H-1525 Budapest, Hungary Hungarian Acad Sci Budapest Hungary H-1525 est, H-1525 Budapest, Hungary
- Titolo Testata:
- ASTRONOMY AND ASTROPHYSICS
fascicolo: 3,
volume: 368,
anno: 2001,
pagine: 880 - 887
- SICI:
- 0004-6361(200103)368:3<880:SOPOTD>2.0.ZU;2-X
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- PERIOD CHANGES; INSTABILITY STRIP; PHOTOMETRY; EVOLUTION;
- Keywords:
- stars : oscillation; stars : variables : delta Sct; stars : individual : AE UMa;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 34
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Szeidl, B Hungarian Acad Sci, Konkoly Observ Budapest, H-1525 Budapest, Hungary Hungarian Acad Sci Budapest Hungary H-1525 5 Budapest, Hungary
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- Citazione:
- M.D. Pocs e B. Szeidl, "Stability of pulsation of the double-mode high-amplitude delta Scuti star AE Ursae Majoris", ASTRON ASTR, 368(3), 2001, pp. 880-887
Abstract
Stability of both the fundamental and first overtone oscillations of AE UMa was investigated by different methods which led to concordant results Thefundamental period of AE UMa has been essentially constant in the past 60 years consistent with the theoretical expectation (Breger & Pamyatnykh 1998). The reported fast period decrease (Hintz et al. 1997) is shown to be incorrect. The constancy of the fundamental period suggests that the star is in the post-main sequence evolutionary state as suggested by the evolutionary theories. The first overtone period is decreasing with a rate of (1/P-1)(dP(1)/dt) = -7.3 10(-8) y(-1). The fact that the rate of period change for two modes is quite different indicates that non-evolutionary effects may also generate period changes. The changes in amplitude of the fundamental andfirst overtone were examined by comparing the least-squares amplitude solution for different segments of observations. Small long-term variations in the amplitudes have occurred in the past 25 years.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/05/13 alle ore 20:42:17