2012A&A...542A.124L

Query : 2012A&A...542A.124L

2012A&A...542A.124L - Astronomy and Astrophysics, volume 542A124-124 (2012/6-1)

Period decrease in three SuperWASP eclipsing binary candidates near the short-period limit.

LOHR M.E., NORTON A.J., KOLB U.C., ANDERSON D.R., FAEDI F. and WEST R.G.

Abstract (from CDS):

SuperWASP light curves for 53 W UMa-type eclipsing binary (EB) candidates, identified in previous work as being close to the contact binary short-period limit, were studied for evidence of period change. The orbital periods of most of the stars were confirmed, and period decrease, significant at more than 5σ, was observed in three objects: 1SWASPJ174310.98+432709.6 (-0.055±0.003s/yr), 1SWASPJ133105.91+121538.0 (-0.075±0.013s/yr) and 1SWASPJ234401.81-212229.1 (-0.313±0.019s/yr). The magnitudes of the observed period changes cannot be explained by magnetic braking or gravitational radiation effects, and are most likely primarily due to unstable mass transfer from primary to secondary components, possibly accompanied by unstable mass and angular momentum loss from the systems. If these period decreases persist, the systems could merge on a relatively short timescale.

Abstract Copyright: ∼

Journal keyword(s): stars: variables: general - binaries: eclipsing - stars: individual: V1067 Her - stars: individual: GSC 2314-0530 - binaries: close

Simbad objects: 56

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Number of rows : 56
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 1SWASP J000437.82+033301.2 EB* 00 04 37.8402415152 +03 33 01.142186688     14.53     ~ 10 0
2 1SWASP J003033.05+574347.6 EB* 00 30 33.1069518744 +57 43 47.296083324     14.89     ~ 12 0
3 1SWASP J004050.63+071613.9 EB* 00 40 50.6720557152 +07 16 13.733691996 13.04 12.90 12.18 11.76 11.30 ~ 9 0
4 LSPM J0220+3320 ** 02 20 50.850720 +33 20 47.55228   14.86 13.37 12.98 10.98 M2e 52 0
5 1SWASP J022727.03+115641.7 * 02 27 27.0423002160 +11 56 41.618368788     14.95     ~ 7 1
6 1SWASP J030749.87-365201.7 EB* 03 07 49.9296035472 -36 52 02.123347944           ~ 12 0
7 1SWASP J034439.97+030425.5 EB* 03 44 39.9789998856 +03 04 25.420918476     13.79     ~ 12 0
8 1SWASP J040615.79-425002.3 EB* 04 06 15.8287303944 -42 50 02.335399800     14.14     ~ 9 0
9 1SWASP J041120.40-230232.3 EB* 04 11 20.5977050664 -23 02 33.149614848     13.95     ~ 8 0
10 1SWASP J041655.13-492709.8 EB* 04 16 55.1549361696 -49 27 09.807210252     15.04     ~ 6 0
11 1SWASP J044132.96+440613.7 EB* 04 41 32.9571853128 +44 06 13.498421760     14.19     ~ 18 0
12 ASAS J050905-0741.7 EB* 05 09 04.4454771192 -07 41 44.254513500   14.28 13.30 13.29   ~ 18 0
13 1SWASP J051501.18-021948.7 EB* 05 15 01.1166177072 -02 19 50.444335632     14.53 14.346 13.747 ~ 10 0
14 ASAS J052037+0304.1 EB* 05 20 36.8482214256 +03 04 02.284200912     12.35     ~ 8 0
15 UCAC4 673-043094 * 05 54 18.4463190984 +44 25 49.506078540       14.60   ~ 3 0
16 NSVS 7178717 EB* 06 45 01.2244405485 +34 21 54.651662131   15.298 14.11     K4-5 22 0
17 1SWASP J074658.62+224448.5 EB* 07 46 58.6433536080 +22 44 48.244280604     14.13     ~ 28 0
18 1SWASP J080150.03+471433.8 EB* 08 01 50.0297088792 +47 14 33.429534972     13.40     ~ 30 0
19 1SWASP J092328.76+435044.8 EB? 09 23 28.76 +43 50 44.8     13.03     ~ 3 0
20 1SWASP J092756.25-391119.2 EB? 09 27 56.25 -39 11 19.2     11.77     ~ 3 0
21 RX J0930.1+5339 ** 09 30 10.770144 +53 38 59.63712   10.52 9.54 9.28   K5 33 0
22 RX J0930.1+5339B EB* 09 30 10.9127474328 +53 38 58.355632824   11.84 10.98     K3V+K3V 38 0
23 CD-39 7036 ** 11 19 31.4887587277 -39 50 48.376232939   11.51 11.02     G6V+G6V 10 0
24 V* SV Cen SB* 11 47 57.2198787264 -60 33 57.760436736 7.98 9.71 9.70 9.46 8.810 B1/3 154 0
25 1SWASP J114929.22-423049.0 EB* 11 49 29.1970502328 -42 30 48.922377264   15.56 14.33 13.48 12.67 ~ 7 0
26 1SWASP J115557.80+072010.8 EB* 11 55 57.8607098424 +07 20 11.165364636     15.18 15.41   ~ 9 0
27 TYC 5518-774-1 EB? 11 56 05.8865933232 -09 13 00.747808752   12.65 12.22     ~ 4 0
28 1SWASP J120110.98-220210.8 EB* 12 01 10.9716789168 -22 02 10.740845796   16.13 15.01 14.32 13.72 ~ 7 0
29 1SWASP J121906.35-240056.9 EB* 12 19 06.3292423176 -24 00 56.956266828     15.25     ~ 11 0
30 1SWASP J130920.49-340919.9 EB* 13 09 20.4733104288 -34 09 19.965988332     13.91     ~ 7 0
31 TYC 895-616-1 EB* 13 31 05.8411652424 +12 15 38.395607292   11.74 10.667 10.56   K3 25 0
32 ATO J215.8025-22.4070 EB? 14 23 12.6202307568 -22 24 25.281423648     13.19     ~ 7 0
33 1SWASP J150822.80-054236.9 EB* 15 08 22.7872590552 -05 42 36.898208784     12.45 12.306   ~ 23 0
34 1SWASP J151652.90+004835.8 EB? 15 16 52.8660683328 +00 48 35.557232436     13.97     ~ 4 0
35 1SWASP J155822.10-025604.8 EB* 15 58 22.0970365128 -02 56 04.862017716   14.870 13.87     ~ 17 0
36 1SWASP J160156.04+202821.6 EB* 16 01 56.0393264112 +20 28 21.535058244     13.81     ~ 30 0
37 1SWASP J161334.28-284706.7 EB? 16 13 34.2875336304 -28 47 06.727284348     12.43     ~ 4 0
38 ROTSE1 J170240.11+151122.7 EB* 17 02 40.0602010104 +15 11 23.473735728     13.56     ~ 14 0
39 V* V1498 Her EB* 17 30 03.2226800712 +34 45 09.372871368     13.78     ~ 14 0
40 ATO J264.6185+11.1973 EB* 17 38 28.46 +11 11 50.5     13.80     ~ 10 0
41 V* V1067 Her EB* 17 43 10.9789967640 +43 27 09.456982380   13.359 13.513 12.889 11.663 K1 48 0
42 V* V1309 Sco CV* 17 57 32.9368332984 -30 43 09.965039880           ~ 320 0
43 V* V1104 Her EB* 18 09 47.6414646096 +49 02 54.991909536   14.0 13.51 13.560   M0 44 0
44 1SWASP J183738.17+402427.2 EB* 18 37 38.1838682976 +40 24 27.090466956     14.45     ~ 8 0
45 ATO J299.7514-25.4563 EB* 19 59 00.3326992861 -25 27 22.997672687     14.64     ~ 8 0
46 1SWASP J210318.76+021002.2 EB? 21 03 18.7650640032 +02 10 02.175300984     13.00     ~ 10 0
47 UCAC4 488-136818 dS* 21 04 23.5766263910 +07 31 41.941988590   14.990 13.960 13.960   ~ 5 0
48 LAMOST J212454.52+203030.4 EB* 21 24 54.5335262249 +20 30 30.359443029     14.35     ~ 13 0
49 CRTS J212808.8+151622 EB* 21 28 08.8584368496 +15 16 21.937443456   16.108 14.49     ~ 25 0
50 CRTS J214510.1-494401 EB* 21 45 10.250 -49 44 01.64     14.55     ~ 4 0
51 V* V729 Peg EB* 22 07 34.4723910216 +26 55 28.460505180     14.25     ~ 10 0
52 1SWASP J221058.82+251123.4 EB* 22 10 58.8848970600 +25 11 18.461919660   16.258 15.259 15.645   ~ 7 0
53 CRTS J224747.1-351850 EB* 22 47 47.2057185336 -35 18 49.732010532     13.89     ~ 8 0
54 1SWASP J232607.07-294130.7 EB? 23 26 07.0593509117 -29 41 31.109600153     13.71     ~ 4 0
55 StKM 1-2148 SB* 23 44 01.8132261120 -21 22 29.099158536   12.84 11.70 11.50   K4 19 0
56 V* V818 And EB* 23 53 33.5999148024 +45 52 45.888028500     14.75     ~ 6 0

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