2006A&A...452..933O


Query : 2006A&A...452..933O

2006A&A...452..933O - Astronomy and Astrophysics, volume 452, 933-939 (2006/6-4)

The CUrious Variables Experiment (CURVE). Variable properties of the dwarf nova SS Ursae Minoris.

OLECH A., MULARCZYK K., KEDZIERSKI P., ZLOCZEWSKI K., WISNIEWSKI M. and SZARUGA K.

Abstract (from CDS):

We report on extensive photometry of the dwarf nova SS Ursae Minoris throughout nine months of 2004. In total, we recorded two superoutbursts and 11 normal outbursts of the star. SS UMi has been known to show frequent superoutbursts with a mean interval of 84.7-days. Our data suggest that the interval between successive superoutbursts lengthened to 197-days, indicating that SS UMi entered a period of untypical behavior manifested by a growth in the quiescent magnitude of the star and a series of frequent, low-amplitude, normal outbursts observed from July to September 2004. The mean superhump period derived for the April 2004 superoutburst of SS UMi is Psh=0.070149(16)-days (101.015±0.023min). Combining this value with an earlier orbital period determination, we were able to derive the period excess, which is equal to 3.5±1.6%, and estimate the mass ratio of the binary system as equal to q=0.16±0.07. During the entire superoutburst, the period decreased at a rate of {dot}(P/P)sh=-6.3(1.4)x10–5. However, detailed analysis of the timings of superhump maxima seem to suggest a more complex period change, with a decrease in the period during the first and last stages of the superoutburst but an increase in the middle interval.

Abstract Copyright:

Journal keyword(s): stars: binaries: close - stars: variables: general - stars: dwarf novae

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 V* WX Cet CV* 01 17 04.1794193856 -17 56 22.414606224           ~ 169 0
2 V* V1159 Ori CV* 05 28 59.5676204544 -03 33 52.282939068   14.321 14.203 15.317   ~ 142 0
3 V* YZ Cnc CV* 08 10 56.6511822192 +28 08 33.260657100     15.24     ~ 246 0
4 V* SW UMa CV* 08 36 42.7492998204 +53 28 37.976599017           ~ 307 0
5 V* DI UMa CV* 09 12 16.1933315112 +50 53 53.956934520           ~ 85 0
6 V* ER UMa CV* 09 47 11.9410111200 +51 54 08.950092804 14.351 14.03 13.91 14.909 14.629 ~ 147 0
7 V* RZ LMi CV* 09 51 48.9263549904 +34 07 23.966634108           DA 113 0
8 V* KS UMa CV* 10 20 26.5185297792 +53 04 33.089641968   17.0       ~ 68 0
9 V* SX LMi CV* 10 54 30.4187071632 +30 06 10.358155512   16.9   15.6   ~ 75 0
10 V* CY UMa CV* 10 56 56.9964835104 +49 41 18.201049512   17.0       ~ 104 1
11 V* V485 Cen CV* 12 57 23.1807645432 -33 12 05.742562932           ~ 105 0
12 V* HV Vir CV* 13 21 03.1661521320 +01 53 29.075499492           DA 155 0
13 V* TT Boo CV* 14 57 44.7548342472 +40 43 40.691473248           ~ 73 0
14 V* SS UMi CV* 15 51 22.3401322752 +71 45 11.834778240           ~ 72 0
15 [HH95] SS UMi-6 * 15 51 59.3751535608 +71 44 25.503828216   13.417 12.506     ~ 2 0
16 [HH95] SS UMi-7 * 15 52 07.2216616776 +71 46 34.631457636   14.242 13.187     ~ 2 0
17 V* IX Dra CV* 18 12 31.4711619792 +67 04 45.821734572           sdB 45 0
18 V* V1028 Cyg CV* 20 00 56.4596100362 +56 56 37.060154519           ~ 53 0
19 V* RZ Sge CV* 20 03 18.47616 +17 02 51.9432   17.6   17.2   ~ 89 0
20 V* EI Psc CV* 23 29 54.2146447848 +06 28 11.596023228   16.86 16.22     ~ 128 0

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