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

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

2012A&A...542A.124L - Astronomy and Astrophysics, volume 542A, 124-124 (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: 55

Full paper

View the references in ADS

Number of rows : 55

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	1SWASP J000437.82+033301.2	EB?	00 04 37.8402415152	+03 33 01.142186688			14.53			~	6	0
2	1SWASP J003033.05+574347.6	EB*	00 30 33.1069518744	+57 43 47.296083324			14.89			~	7	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	~	6	0
4	V* BX Tri	EB*	02 20 50.850720	+33 20 47.55228		14.86	13.37	12.98	10.98	M2e	48	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			14.65	14.64		~	10	0
7	1SWASP J034439.97+030425.5	EB*	03 44 39.9789998856	+03 04 25.420918476			13.79			~	7	0
8	1SWASP J040615.79-425002.3	EB*	04 06 15.8287303944	-42 50 02.335399800			14.14			~	7	0
9	1SWASP J041120.40-230232.3	EB*	04 11 20.5977050664	-23 02 33.149614848			13.95			~	6	0
10	1SWASP J041655.13-492709.8	EB*	04 16 55.1549361696	-49 27 09.807210252			15.04			~	5	0
11	1SWASP J044132.96+440613.7	EB*	04 41 32.9571853128	+44 06 13.498421760			14.19			~	12	0
12	ASAS J050905-0741.7	EB*	05 09 04.4454771192	-07 41 44.254513500		14.28	13.30	13.29		~	12	0
13	1SWASP J051501.18-021948.7	EB*	05 15 01.1166177072	-02 19 50.444335632			14.53	14.346	13.747	~	6	0
14	ASAS J052037+0304.1	EB*	05 20 36.8482214256	+03 04 02.284200912			12.35			~	6	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	15	0
17	1SWASP J074658.62+224448.5	EB*	07 46 58.6433536080	+22 44 48.244280604			14.13			~	22	0
18	1SWASP J080150.03+471433.8	EB*	08 01 50.0297088792	+47 14 33.429534972			13.40			~	19	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		~	31	0
22	ASAS J111932-3950.8	EB*	11 19 31.4887587277	-39 50 48.376232939		11.51	11.02			G6V+G6V	6	0
23	V* SV Cen	EB*	11 47 57.2198787264	-60 33 57.760436736	7.98	9.71	9.70	9.46	8.810	B1/3	144	0
24	1SWASP J114929.22-423049.0	EB*	11 49 29.1970502328	-42 30 48.922377264		15.56	14.33	13.48	12.67	~	5	0
25	1SWASP J115557.80+072010.8	EB*	11 55 57.8607098424	+07 20 11.165364636			15.18	15.41		~	6	0
26	TYC 5518-774-1	EB?	11 56 05.8865933232	-09 13 00.747808752		12.65	12.22			~	4	0
27	1SWASP J120110.98-220210.8	EB*	12 01 10.9716789168	-22 02 10.740845796		16.13	15.01	14.32	13.72	~	6	0
28	1SWASP J121906.35-240056.9	EB*	12 19 06.3292423176	-24 00 56.956266828			15.25			~	8	0
29	1SWASP J130920.49-340919.9	EB*	13 09 20.4733104288	-34 09 19.965988332			13.91			~	6	0
30	TYC 895-616-1	EB*	13 31 05.8411652424	+12 15 38.395607292		11.74	10.667	10.56		~	18	0
31	ATO J215.8025-22.4070	EB?	14 23 12.6202307568	-22 24 25.281423648			13.19			~	7	0
32	1SWASP J150822.80-054236.9	EB*	15 08 22.7872590552	-05 42 36.898208784			12.45	12.306		~	15	0
33	1SWASP J151652.90+004835.8	EB?	15 16 52.8660683328	+00 48 35.557232436			13.97			~	4	0
34	1SWASP J155822.10-025604.8	EB*	15 58 22.0970365128	-02 56 04.862017716		14.870	13.87			~	11	0
35	1SWASP J160156.04+202821.6	EB*	16 01 56.0393264112	+20 28 21.535058244			13.81			~	20	0
36	1SWASP J161334.28-284706.7	EB?	16 13 34.2875336304	-28 47 06.727284348			12.43			~	4	0
37	ROTSE1 J170240.11+151122.7	EB*	17 02 40.0602010104	+15 11 23.473735728			13.56			~	9	0
38	V* V1498 Her	EB*	17 30 03.2226800712	+34 45 09.372871368			13.78			~	9	0
39	1SWASP J173828.46+111150.2	EB?	17 38 28.46	+11 11 50.5			13.80			~	8	0
40	V* V1067 Her	EB*	17 43 10.9789967640	+43 27 09.456982380		13.359	13.513	12.889	11.663	~	37	0
41	V* V1309 Sco	No*	17 57 32.9368332984	-30 43 09.965039880		16.9		14.8		~	240	0
42	V* V1104 Her	EB*	18 09 47.6414646096	+49 02 54.991909536		14.0	13.51	13.560		~	36	0
43	1SWASP J183738.17+402427.2	EB*	18 37 38.1838682976	+40 24 27.090466956			14.45			~	4	0
44	1SWASP J195900.31-252723.1	EB?	19 59 00.3326992861	-25 27 22.997672687			14.64			~	6	0
45	1SWASP J210318.76+021002.2	EB?	21 03 18.7650640032	+02 10 02.175300984			13.00			~	9	0
46	UCAC4 488-136818	dS*	21 04 23.5766263910	+07 31 41.941988590		14.990	13.960	13.960		~	5	0
47	1SWASP J212454.61+203030.8	EB?	21 24 54.61	+20 30 30.8			14.35			~	8	0
48	CRTS J212808.8+151622	EB*	21 28 08.8584368496	+15 16 21.937443456		16.108	14.49			~	13	0
49	CRTS J214510.1-494401	EB*	21 45 10.250	-49 44 01.64			14.55			~	4	0
50	ATO J331.8936+26.9245	EB?	22 07 34.4723910216	+26 55 28.460505180			14.25			~	6	0
51	1SWASP J221058.82+251123.4	EB?	22 10 58.82	+25 11 23.4			15.13			~	4	0
52	CRTS J224747.1-351850	EB*	22 47 47.2057185336	-35 18 49.732010532			13.89			~	7	0
53	1SWASP J232607.07-294130.7	EB?	23 26 07.07	-29 41 30.7			13.71			~	3	0
54	StKM 1-2148	EB*	23 44 01.8132261120	-21 22 29.099158536		12.84	11.70	11.50		K4	17	0
55	ATO J358.3899+45.8794	EB?	23 53 33.5999148024	+45 52 45.888028500			14.75			~	4	0

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