2011A&A...532A..64O


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST04:04:54

2011A&A...532A..64O - Astronomy and Astrophysics, volume 532A, 64-64 (2011/8-1)

SDSS J162520.29+120308.7 - a new SU Ursae Majoris star in the period gap.

OLECH A., DE MIGUEL E., OTULAKOWSKA M., THORSTENSEN J.R., RUTKOWSKI A., NOVAK R., MASI G., RICHMOND M., STAELS B., LOWTHER S., STEIN W., AK T., BOYD D., KOFF R., PATTERSON J. and EKER Z.

Abstract (from CDS):

We report results of an extensive world-wide observing campaign devoted to the recently discovered dwarf nova SDSS J162520.29+120308.7 (SDSS J1625). The data were obtained during the July 2010 eruption of the star and in August and September 2010 when the object was in quiescence. During the July 2010 superoutburst, SDSS J1625 clearly displayed superhumps with a mean period of Psh=0.095942(17) days (138.16±0.02min) and a maximum amplitude reaching almost 0.4mag. The superhump period was not stable, decreasing very rapidly at a rate of {dot}(P)=-1.63(14)x10–3 at the beginning of the superoutburst and increasing at a rate of {dot}(P)=2.81(20)x10–4 in the middle phase. At the end of the superoutburst, it stabilized around the value of Psh=0.09531(5) day. During the first twelve hours of the superoutburst, a low-amplitude double wave modulation was observed whose properties are almost identical to early superhumps observed in WZ Sge stars. The period of early superhumps, the period of modulations observed temporarily in quiescence, and the period derived from radial velocity variations are the same within measurement errors, allowing us to estimate the most probable orbital period of the binary to be Porb=0.09111(15) days (131.20±0.22 min). This value clearly indicates that SDSS J1625 is another dwarf nova in the period gap. Knowledge of the orbital and superhump periods allows us to estimate the mass ratio of the system to be q≃0.25. This high value poses serious problems for both the thermal and tidal instability (TTI) model describing the behaviour of dwarf novae and for some models explaining the origin of early superhumps.

Abstract Copyright:

Journal keyword(s): binaries: general - stars: dwarf novae - stars: individual: SDSS J162520.29+120308.7

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* TU Men DN* 04 41 40.7062108407 -76 36 45.940466299         14.057 ~ 147 0
2 V* U Gem DN* 07 55 05.2323858391 +22 00 05.045435077   15.3 14.54     DA 1046 0
3 V* RZ Leo DN* 11 37 22.2523056583 +01 48 58.617841432     19.6     DA+dM2 146 0
4 V* TT Boo DN* 14 57 44.7550274249 +40 43 40.691526116           ~ 66 0
5 SDSS J162520.29+120308.7 WD* 16 25 20.29440 +12 03 08.8236   18.6   17.9   D+M 16 0
6 CRTS J162718.4+120435 CV? 16 27 18.4004335478 +12 04 35.033385175           ~ 15 0
7 V* V344 Lyr DN* 18 44 39.1748774868 +43 22 28.051486081           ~ 80 0
8 V* WZ Sge DN* 20 07 36.5036203067 +17 42 14.733657651   15.30 15.20     DAepv 888 0
9 V* SS Cyg DN* 21 42 42.8034554117 +43 35 09.863763484 11.07 8.2 7.70     K5V 1211 1

    Equat.    Gal    SGal    Ecl

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2020.07.08-04:04:54

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