User:IndyJr/V407 Cygni

V407 Cygni (V407 Cyg) is a symbiotic nova located in the Cygnus Constellation.

Property
V407 Cygni was discovered in 1936, and is formed by a red giant of class M variable Mira linked in pairs with a white dwarf it conceals.

The giant star ejects material in the stellar wind form which is collected and accumulated on the white dwarf surface, forming a nebula. When the accumulated material reaches a critical density there is an intense explosion, which is the typical characteristic of the nova.

The analysis of the archive data made it possible to trace at least two explosive episodes, one dating back to the 1930s, and a more recent one occurred in 2003.

Gamma ray blast
On 2010, March 10 the Fermi Gamma-ray Space Telescope gamma-ray observatory satellite detected a transient event from V407 Cygni consisting of an intense gamma-ray emission ($0.1&minus;10 GeV$), making the object the first nova capable of emitting gamma rays that has ever been discovered. It corresponded to an intense eruption visible in the optical band (up to magnitude +7, when normally the star did not exceed the 13th magnitude).

Subsequent investigations using the Very Long Baseline Interferometry (VLBI) made it possible to record intense radio wave emissions, from whose analysis it was possible to study the morphology of the material accumulated on the white dwarf and how it is modified by explosive events, finding close similarities with Hen 2-104 (or Southern Crab Nebula), another symbiotic nova that underwent an intense explosion about 5700 years ago. [4]