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Table 3

The comparison and check stars used during the observation of each close binary.

Variable Comparison Check

QX And GSC 2816–2039 GSC 2816–1820
α2000: 01h57m5778 01h57m4714 01h57m3194
δ2000: +37°48′224 +37°47′303 +37°53′432
Spec. Type: F5 F0 F3
V(mag): 11.43 10.9 11.2

RW Com GSC 1991–1657
α2000: 12h33m0028 12h33m0394
δ2000: +26°42′584 +26°37′276
Spec. Typ.: G2
V(mag): 11.00 11.86

MR Del GSC 518–13 GSC 518–447
α2000: 20h31m1346 20h31m2418 20h31m2353
δ2000: +05°13′085 +05°12′501 +05°18′03′̣1
Spec. Type: K0 F2
V(mag): 11.01 9.86 9.73

BD +07° 3142 GSC 380–167 GSC 380–429
α2000: 16h10m0321 16h20m0922 16h20m1284
δ2000: +07°07′287 +07°03′546 +07°11′175
Spec. Typ.: G5 F8
V(mag): 9.89 9.15 10.6

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