Red dwarf doubles

 Here are three more red-dwarf systems, all in the "nearest stars" category.  The interesting twist with these examples is that they are all binary systems.

Gliese 725

Gliese 725 (Struve 2398) is a pair of red dwarfs in the constellation Draco. The magnitudes are 8.9 and 9.7, separated by 10.6".  The distance of 11.5 light years makes this the 15th closest star system to our own.

Olympus E-P5 + Rokinon 135mm f2, 60s, ISO1600. N is up. 2-deg square.

The image scale with this camera+lens combination is 5.6"/pixel, so this pair spans less than two pixels in this image, not enough to distinguish them individually.

Groombridge 34 AB

Groombridge 34 AB (a.k.a., GX Andromedae and GQ Andromedae) is a red-dwarf pair in the constellation Andromeda only about 5 deg NW from the Andromeda Galaxy, M31.  The magnitudes are 8.1 and 11.1, with a separation of 34".  At a distance of 11.6 ly this is the 16th closest star system.  The parenthetical names are variable-star designations owing to the fact that these stars, like most red dwarfs, are flare stars and sporadically increase in brightness due to surface flares.

Olympus E-P5 + Rokinon 135mm f2, 60s, ISO1600. N is up. 2-deg square.

Olympus E-M5iii + SIgma 56mm f/1.4 + softon filter.  60 s, ISO 1600. 8-deg square.

Kruger 60

Kruger 60 (DO Cephei) is a red-dwarf pair in the constellation Cepheus.  The stars are magnitude 9.8 and 11.4, separated by 3.3".  At a distance of 13.1 ly this system is the 27th closest to our own.

 

Olympus E-P5 + Rokinon 135mm f2, 60s, ISO1600. N is up. 2-deg square.

 

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