V729 Sgr: a long period dwarf nova showing negative superhumps during quiescence

被引：10

作者：

Ramsay, Gavin ^{[1
]}

Wood, Matt A. ^{[2
]}

Cannizzo, John K. ^{[3
,4
,5
]}

Howell, Steve B. ^{[6
]}

Smale, Alan ^{[7
]}

机构：

[1] Armagh Observ & Planetarium, Coll Hill, Armagh BT61 9DG, North Ireland

[2] Texas A&M Univ Commerce, Dept Phys & Astron, Commerce, TX 75429 USA

[3] NASA, Goddard Space Flight Ctr, CRESST, Greenbelt, MD 20771 USA

[4] NASA, Goddard Space Flight Ctr, Astroparticle Phys Lab, Greenbelt, MD 20771 USA

[5] Univ Maryland Baltimore Cty, Dept Phys, 1000 Hilltop Circle, Baltimore, MD 21250 USA

[6] NASA, Ames Res Ctr, Moffett Field, CA 94095 USA

[7] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 469卷 / 01期

基金：

美国国家科学基金会;

关键词：

accretion; accretion discs; stars: dwarf novae; stars: individual: V729 Sgr; novae; cataclysmic variables; X-RAY BINARIES; CATACLYSMIC VARIABLES; KEPLER OBSERVATIONS; SIMULATIONS; MISSION; SUPEROUTBURSTS; OUTBURSTS; EVOLUTION; STARS; FIELD;

D O I：

10.1093/mnras/stx859

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report K2 observations of the eclipsing cataclysmic variable V729 Sgr which covered nearly 80 d in duration. We find five short outbursts and two long outbursts, one of which shows a clear plateau phase in the rise to maximum brightness. The mean time between successive short outbursts is similar to 10 d while the time between the two long outbursts is similar to 38 d. The frequency of these outbursts is unprecedented for a cataclysmic variable ( CV) above the orbital period gap. We find evidence that the mid-point of the eclipse occurs systematically earlier in outburst than in quiescence. During five of the six quiescent epochs we find evidence for a second photometric period which is roughly 5 per cent shorter than the 4.16 h orbital period which we attribute to negative superhumps. V729 Sgr is therefore one of the longest period CVs to show negative superhumps during quiescence.

引用

页码：950 / 955

页数：6

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