Curious Variables Experiment (CURVE). Superhump Period Change Pattern in KS UMa and Other Dwarf Novae

• Autorzy: Olech, A. , Schwarzenberg-Czerny, A. , Kędzierski, P. , Złoczewski, K. , Mularczyk, K. , Wiśniewski, M.
• Języki publikacji: EN

Abstrakty

EN

We report extensive photometry of the dwarf nova KS UMa throughout its 2003 superoutburst till quiescence. During the superoutburst the star displayed clear superhumps with a mean period of P_sh=0.070092(23) days. In the middle stage of superoutburst the period was increasing with a rate of P/P=(21±12)×10^-5 and later was decreasing with a rate of P/P=-(21±8)×10^-5. At the end of superoutburst and during first dozen days of quiescence the star was showing late superhumps with a mean period of P_late=0.06926(2) days. This phenomenon was observed even 30 days after beginning of the superoutburst. In quiescence the star shows quasi-periodic modulations with amplitude reaching 0.5 mag. The most common structure observed during this stage was sinusoidal wave characterized by a period of about 0.1 days. Comparing KS UMa to other SU UMa stars we conclude that this group of dwarf novae shows decreasing superhump periods at the beginning and the end of superoutburst but increasing period in the middle phase.

Słowa kluczowe

EN

stars: individual: KS UMa; binaries: close; novae; cataclysmic variables

• Czasopismo: Acta Astronomica
• Rocznik: 2003
• Tom: Vol. 56, No. 2
• Strony: 175--194
• Opis fizyczny: Bibliogr. 30 poz., rys., tab., wykr.

Twórcy

autor

Olech, A.

• Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, ul. Bartycka 18, 00-716 Warszawa, Poland,

autor

Schwarzenberg-Czerny, A.

• Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, ul. Bartycka 18, 00-716 Warszawa, Poland,
• Adam Mickiewicz University Observatory, ul. Słoneczna 36, 60-286 Poznań, Poland

autor

Kędzierski, P.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland,

autor

Złoczewski, K.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland,

autor

Mularczyk, K.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland,

autor

Wiśniewski, M.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland,

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