GD 356 [SEP] constellation
GD 356
GD 356 is a white dwarf in the constellation of Draco showing an unusual emission of circular polarised light. The star is 65 light years from earth. The class of this white dwarf is DA meaning that it has a cool helium rich atmosphere. This star exhibits emission lines showing the Zeeman effect in the hydrogen Balmer spectrum. GD 356 belongs to a class of high field magnetic white dwarfs (HFMWD), but it is unique in that the split lines are purely emission lines with no absorption. The emission
GD 165
GD 165 is a system of a white dwarf and a brown dwarf of spectral types DA4 + L4, located in constellation Boötes at approximately 103 light-years from Earth.
Nomenclature and observation.
"GD" means "Giclas Dwarf".
The component GD 165 B was discovered in 1988 by Becklin and Zuckerman. It is the first L-type brown dwarf, and in general, the first dwarf cooler than M dwarfs discovered, but it was not recognized as a brown dwarf until the