2018RAA....18..129K

Query : 2018RAA....18..129K

2018RAA....18..129K - Research in Astron. and astroph., 18, 129-129 (2018/October-0)

NSVS 2569022: a peculiar binary among W UMa stars with extremely small mass ratios.

KJURKCHIEVA D.P., POPOV V.A. and PETROV N.I.

Abstract (from CDS):

Photometric observations of the W UMa binary NSVS 2569022 are presented. The light curve solution reveals that both components are of F spectral type (temperatures $T_1 = T_2 = 6100$ K). NSVS 2569022 undergoes a total eclipse of W subtype and the mass ratio is well-determined. Its extremely small value of only 0.077 implies that the target will probably experience instability and a possible merger. This value ranks NSVS 2569022 in sixth place among binaries with the smallest mass ratio. Based on an empirical relation of "period - total mass" for low mass-ratio binaries, we estimate the global parameters of NSVS 2569022: masses $M_1 = 1.17 M_☉$ and $M_2 = 0.09 M_☉$; radii $R_1 = 1.19 R_☉$ and $R_2 = 0.38 R_☉$; luminosities $L_1 = 1.73 L_☉$ and $L_2 = 0.17 L_☉$. An analysis of the characteristics of binaries with extremely low-mass ratios is made. NSVS 2569022 turns out to be a peculiar binary among W UMa stars with extremely small mass ratios due to its unexpectedly small fill-out factor of only 0.014 (slightly overcontact configuration).

Abstract Copyright: ∼

Journal keyword(s): binaries: eclipsing - binaries: close - stars: fundamental parameters - stars: individual: (NSVS 2569022)

Simbad objects: 46

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Number of rows : 46
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 V* DZ Psc SB* 00 36 27.9388593960 +21 32 14.535908016   11.64 11.08 10.554 10.255 F7V 73 0
2 V* EM Psc EB* 01 18 48.5182818096 +13 21 07.723148580   14.3 13.33     ~ 47 0
3 V* V776 Cas SB* 01 53 23.4353019768 +70 02 33.441869868   9.47 9.03     F0 83 0
4 V* CU Tau EB* 03 47 36.9103738080 +25 23 15.845178660   12.02 11.23 11.38 10.678 G0 66 0
5 V* IK Per EB* 04 29 27.4573781040 +42 03 10.585181376   12.17 11.49     A2 59 0
6 HD 280332A SB* 05 01 10.8328702632 +34 30 26.555760288   10.94 10.34     ~ 110 0
7 HD 280332 ** 05 01 10.83934 +34 30 26.5819   10.901 10.215 10.047 9.305 G0 97 0
8 V* AH Aur SB* 06 26 04.9301455152 +27 59 56.448934440   10.84 10.24 9.846 9.532 F7V 93 0
9 ASAS J063546+1928.6 EB* 06 35 46.2146862072 +19 28 28.042399452   10.74 10.08     ~ 18 0
10 HD 60987A Pu* 07 38 30.2249452896 +33 42 41.503274640   8.41 8.03 8.70   F0 90 1
11 V* V710 Mon EB* 07 46 51.7986048432 -04 41 36.749942232           G5 19 0
12 ASAS J082243+1927.0 EB* 08 22 42.9982436976 +19 26 58.402361400   11.87 11.62 11.325 10.638 ~ 27 0
13 V* FG Hya SB* 08 27 03.9412969584 +03 30 52.329583548   10.62 10.04 9.544 9.401 G0 213 0
14 ASAS J083241+2332.4 EB* 08 32 40.9138117032 +23 32 25.822223448     12.70 12.393   ~ 37 0
15 Cl* NGC 2682 SAND 1282 SB* 08 51 37.8473566296 +11 50 57.092451072 13.964 13.89 13.333   12.634 F7V 181 0
16 V* W UMa SB* 09 43 45.4704536952 +55 57 09.061630668   8.54 7.75     G2Vn 686 0
17 V* Y Sex SB* 10 02 47.9625666528 +01 05 40.327404108   10.38 9.95 9.875 8.471 F3/5V 122 0
18 UCAC4 790-020961 * 10 08 55.9096589136 +67 48 49.829856048   13.20 12.16 11.98   ~ 1 0
19 [GGM2006] 2569021 EB* 10 10 42.6797806360 +67 39 31.654494471   10.88 10.28 9.984 9.657 ~ 15 0
20 UCAC4 789-020996 * 10 11 02.2588782888 +67 37 17.166948780   13.88 12.97 12.76   ~ 1 0
21 UCAC4 788-021201 * 10 11 15.2581484448 +67 35 07.135117440   13.51 12.55 12.40   ~ 1 0
22 TYC 4384-470-1 * 10 11 18.7207818984 +67 32 27.207518028   12.66 12.11     ~ 1 0
23 TYC 4143-808-1 * 10 11 48.1867599192 +67 28 03.964045800   12.48 11.65     ~ 1 0
24 TYC 4384-242-1 * 10 11 57.2901932088 +67 39 46.800666504   12.70 12.09     ~ 2 0
25 LP 62-70 PM* 10 12 04.3962092496 +67 40 38.432717400     12.17     ~ 5 0
26 TYC 4384-16-1 * 10 13 01.9591198128 +67 45 25.186201092   11.84 11.28     ~ 1 0
27 V* XY LMi EB* 10 34 12.3397648848 +32 08 51.687954600   11.78 11.20 10.874 10.584 ~ 29 0
28 V* AW UMa SB* 11 30 04.3160006304 +29 57 52.674404544   7.27   6.7   F0 302 0
29 ASAS J113031-0101.9 EB* 11 30 30.8280184848 -01 01 57.037721268     13.33     ~ 16 0
30 V* TV Mus EB* 11 39 57.7633052952 -64 48 59.229170568   11.48 10.75   9.712 F2 76 0
31 HD 103576 * 11 55 38.0372183472 +47 15 26.635878216   8.92 8.65     A3 50 0
32 [GGM2006] 2657877 EB* 12 06 19.7873093304 +57 10 35.159392164   10.54 10.047 9.837 9.566 F5 23 0
33 V* SX Crv SB* 12 40 15.0427768512 -18 48 00.941011128   9.56 9.108 8.719 8.412 F7V 106 0
34 V* XY Boo SB* 13 49 11.5666861776 +20 11 24.590393088   10.71 10.54 9.994 9.698 F5V 154 0
35 V* DN Boo EB* 13 51 42.0429638472 +14 18 05.946653340   11.78 11.34     G0 37 0
36 V* CK Boo SB* 14 35 03.7596377832 +09 06 49.373523360   9.61 9.029 8.683 8.414 F7/8V 150 0
37 V* GR Vir SB* 14 45 20.2632619872 -06 44 04.131471300   8.54 8.00   7.34 G2/3V 151 0
38 V* AW CrB EB* 16 15 20.1890018640 +35 42 26.264696256   11.46 11.12 10.771 10.485 F6 26 1
39 Cl* NGC 6121 SAW V72 EB* 16 23 38.4880359196 -26 32 10.911560523 16.76 16.46 15.83 15.40 15.01 ~ 31 0
40 V* V857 Her SB* 16 46 53.5600592376 +38 38 58.246857528   11.04 10.87 9.808 9.558 A6 96 1
41 V* V728 Her EB* 17 18 04.2960486792 +41 50 38.707746684   11.25 10.61 10.658 10.416 F0 93 0
42 V* V2388 Oph SB* 17 54 14.1665728728 +11 07 49.770939000   6.72   6.0   F5Vn 133 0
43 V* V870 Ara SB* 18 08 22.6749490488 -56 46 01.800121404   9.65 8.96     F7/G0 66 0
44 V* MW Pav SB* 20 46 27.7481505168 -71 56 58.466402412   9.15 8.79     F3IV/V 83 0
45 V* HV Aqr SB* 21 21 24.8100075384 -03 09 36.885487068   10.50 9.99 9.337 9.148 F5V 63 0
46 V* V1911 Cyg Mi* 21 33 15.3914121456 +35 42 00.635430780   14.2   12.05   ~ 12 0

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