Late Superhumps in WZ Sge-Type Dwarf Novae

被引：31

作者：

Kato, Taichi ^{[1
]}

Maehara, Hiroyuki ^{[2
,3
]}

Monard, Berto ^{[4
]}

机构：

[1] Kyoto Univ, Dept Astron, Sakyo Ku, Kyoto 6068502, Japan

[2] Kyoto Univ, Kwasan Observ, Yamashina Ku, Kyoto 6078471, Japan

[3] Kyoto Univ, Hida Observ, Yamashina Ku, Kyoto 6078471, Japan

[4] Bronberg Observ, ZA-0056 Tiegerpoort, South Africa

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2008年 / 60卷 / 04期

关键词：

accretion; accretion disks; stars: dwarf novae; stars: individual (GW Librae; V455; Andromedae; WZ Sagittae); stars:; novae; cataclysmic variables;

D O I：

10.1093/pasj/60.4.L23

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on the detection of very stable modulations with periods unexpectedly (similar to 0.5%) longer than the superhump periods during the slowly fading stage of WZ Sge-type superoutbursts in three systems: GW Lib, V455 And, and WZ Sge. The periods are naturally explained by assuming that these modulations are superhumps arising from matter near the tidal truncation radius. This finding provides additional support for the hypothetical idea concerning expansion of the accretion disk well beyond the 3:1 orbital resonance in some low mass-ratio systems. Combined with the effect of a 2:1 resonance, we explain the origin of positive period derivatives in certain short-period SU UMa-type dwarf novae.

引用

页码：L23 / L26

页数：4

共 40 条

[1] HS 2331+3905:: The cataclysmic variable that has it all [J].

Araujo-Betancor, S ;

Gänsicke, BT ;

Hagen, HJ ;

Marsh, TR ;

Harlaftis, ET ;

Thorstensen, J ;

Fried, RE ;

Schmeer, P ;

Engels, D .

ASTRONOMY & ASTROPHYSICS, 2005, 430 (02) :629-642

[2]

BAILEY J, 1979, MNRAS, V189, P41

[3] IUE OBSERVATIONS OF WX CETI IN OUTBURST [J].

DOWNES, RA .

ASTRONOMICAL JOURNAL, 1990, 99 (01) :339-343

[4] On echo outbursts and ER UMa supercycles in SU UMa-type cataclysmic variables [J].

Hellier, C .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2001, 113 (782) :469-472

[5]

HESSMAN FV, 1992, ASTRON ASTROPHYS, V263, P147

[6]

HIROSE M, 1990, PUBL ASTRON SOC JPN, V42, P135

[7]

HIROSE M, 1993, PUBL ASTRON SOC JPN, V45, P595

[8] Superoutburst photometry of AL Comae Berenices [J].

Howell, SB ;

DeYoung, JA ;

Mattei, JA ;

Foster, G ;

Szkody, P ;

Cannizzo, JK .

ASTRONOMICAL JOURNAL, 1996, 111 (06) :2367-2378

[9] First detection of the growing humps at the rapidly rising stage of dwarf novae AL Com and WZ Sge [J].

Ishioka, R ;

Uemura, M ;

Matsumoto, K ;

Ohashi, H ;

Kato, T ;

Masi, G ;

Novak, R ;

Pietz, J ;

Martin, B ;

Starkey, D ;

Kiyota, S ;

Oksanen, A ;

Moilanen, M ;

Cook, L ;

Kral, L ;

Hynek, T ;

Kolasa, M ;

Vanmunster, T ;

Richmond, M ;

Kern, J ;

Davis, S ;

Crabtree, D ;

Beaulieu, K ;

Davis, T ;

Aggleton, M ;

Gazeas, K ;

Niarchos, P ;

Yushchenko, A ;

Mallia, F ;

Fiaschi, M ;

Good, GA ;

Boyd, D ;

Sano, Y ;

Morikawa, K ;

Moriyama, M ;

Mennickent, R ;

Arenas, J ;

Ohshima, T ;

Watanabe, T .

ASTRONOMY & ASTROPHYSICS, 2002, 381 (03) :L41-L44

[10] The 2000-2001 superoutburst of the WZ Sge-type star RZ leonis: A clue to understanding the origin of viscosity in quiescent dwarf nova disks [J].

Ishioka, R ;

Kato, T ;

Uemura, M ;

Iwamatsu, H ;

Matsumoto, K ;

Stubbings, R ;

Mennickent, R ;

Billings, GW ;

Kiyoto, S ;

Masi, G ;

Pietz, J ;

Novak, R ;

Martin, BE ;

Oksanen, A ;

Moilanen, M ;

Torii, K ;

Kinugasa, K ;

Kawakita, H .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2001, 53 (05) :905-913

← 1 2 3 4 →