Survey of period variations of superhumps in su UMa-type dwarf novae

Επιστημονική δημοσίευση - Άρθρο Περιοδικού uoadl:3017135 39 Αναγνώσεις

Μονάδα:
Ερευνητικό υλικό ΕΚΠΑ
Τίτλος:
Survey of period variations of superhumps in su UMa-type dwarf novae
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
We systematically surveyed period variations of superhumps in SU UMa-type dwarf novae based on newly obtained data and past publications. In many systems, the evolution of the superhump period is found to be composed of three distinct stages: an early evolutionary stage with a longer superhump period, a middle stage with systematically varying periods, and a final stage with a shorter, stable superhump period. During the middle stage, many systems with superhump periods of less than 0.08 d show positive period derivatives. We present observational characteristics of these stages and give greatly improved statistics. Contrary to an earlier claim, we found no clear evidence for a variation of period derivatives among different superoutbursts of the same object. We present an interpretation that the lengthening of the superhump period is a result of the outward propagation of an eccentricity wave, which is limited by the radius near the tidal truncation. We interpret that late-stage superhumps are rejuvenated excitation of a 3:1 resonance when superhumps in the outer disk are effectively quenched. The general behavior of the period variation, particularly in systems with short orbital periods, appears to follow a scenario proposed in Kato, Maehara, and Monard (2008, PASJ, 60, L23). We also present an observational summary of WZ Sge-type dwarf novae. Many of them have shown long-enduring superhumps during a post-superoutburst stage having longer periods than those during the main superoutburst. The period derivatives in WZ Sge-type dwarf novae are found to be strongly correlated with the fractional superhump excess, or consequently with the mass ratio. WZ Sge-type dwarf novae with a long-lasting rebrightening or with multiple rebrightenings tend to have smaller period derivatives, and are excellent candidates for those systems around or after the period minimum of evolution of cataclysmic variables. © 2009. Astronomical Society of Japan.
Έτος δημοσίευσης:
2009
Συγγραφείς:
Kato, T.
Imada, A.
Uemura, M.
Nogami, D.
Maehara, H.
Ishioka, R.
Baba, H.
Matsumoto, K.
Iwamatsu, H.
Kubota, K.
Sugiyasu, K.
Soejima, Y.
Moritani, Y.
Ohshima, T.
Ohashi, H.
Tanaka, J.
Sasada, M.
Arai, A.
Nakajima, K.
Kiyota, S.
Tanabe, K.
Imamura, K.
Kunitomi, N.
Kunihiro, K.
Taguchi, H.
Koizumi, M.
Yamada, N.
Nishi, Y.
Kida, M.
Tanaka, S.
Ueoka, R.
Yasui, H.
Maruoka, K.
Henden, A.
Oksanen, A.
Moilanen, M.
Tikkanen, P.
Mika, A.H.O.
Monard, B.
Itoh, H.
Dubovsky, P.A.
Kudzej, I.
Dancikova, R.
Vanmunster, T.
Pietz, J.
Bolt, G.
Boyd, D.
Nelson, P.
Krajci, T.
Cook, L.M.
Torii, K.
Starkey, D.R.
Shears, J.
Jensen, L.-T.
Masi, G.
Hynek, T.
Novák, R.
Kocián, R.
Král, L.
Kučáková, H.
Kolasa, M.
Šťastný, P.
Staels, B.
Miller, I.
Sano, Y.
Ponthière, P.D.E.
Miyashita, A.
Crawford, T.
Brady, S.
Santallo, R.
Richards, T.
Martin, B.
Buczynski, D.
Richmond, M.
Kern, J.
Davis, S.
Crabtree, D.
Beaulieu, K.
Davis, T.
Aggleton, M.
Morelle, E.
Pavlenko, E.P.
Andreev, M.
Baklanov, A.
Koppelman, M.D.
Billings, G.
Urbančok, L.
Ögmen, Y.
Heathcote, B.
Gomez, T.L.
Voloshina, I.
Retter, A.
Mularczyk, K.
Złoczewski, K.
Olech, A.
Kedzierski, P.
Pickard, R.D.
Stockdale, C.
Virtanen, J.
Morikawa, K.
Hambsch, F.-J.
Garradd, G.
Gualdoni, C.
Geary, K.
Omodaka, T.
Sakai, N.
Michel, R.
Cárdenas, A.A.
Gazeas, K.D.
Niarchos, P.G.
Yushchenko, A.V.
Mallia, F.
Fiaschi, M.
Good, G.A.
Walker, S.
James, N.
Douzu, K.-I.
Julian II, W.M.
Butterworth, N.D.
Shugarov, S.Yu.
Volkov, I.
Chochol, D.
Katysheva, N.
Rosenbush, A.E.
Khramtsova, M.
Kehusmaa, P.
Reszelski, M.
Bedient, J.
Liller, W.
Pojmański, G.
Simonsen, M.
Stubbings, R.
Schmeer, P.
Muyllaert, E.
Kinnunen, T.
Poyner, G.
Ripero, J.
Kriebel, W.
Περιοδικό:
Publications of the Astronomical Society of Japan
Εκδότης:
Oxford University Press
Τόμος:
61
Αριθμός / τεύχος:
SPEC. ISS. 2
Σελίδες:
S395-S616
Λέξεις-κλειδιά:
Surveys; Stars, Accretion: accretion disks; Cataclysmic variables; Dwarf novae; Evolutionary stage; Late stage; Long lasting; Mass ratio; Orbital periods; Stars: dwarf novae; Stars: novae: cataclysmic variables, Stars; Surveys
Επίσημο URL (Εκδότης):
DOI:
10.1093/pasj/61.sp2.s395
Το ψηφιακό υλικό του τεκμηρίου δεν είναι διαθέσιμο.