User:IndyJr/V407 Cygni
V407 Cygni (V407 Cyg) is a symbiotic nova located in the Cygnus Constellation.
Property
[edit]V407 Cygni was discovered in 1936[1], and is formed by a red giant of class M variable Mira linked in pairs with a white dwarf it conceals.[2][3]
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.[4][5]
Gamma ray blast
[edit]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 (0.1−10 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]
References
[edit]- ^ Iijima, T. (2015-06-30). "New Features of the Symbiotic Recurrent Nova V407 Cygni Found in the Outburst in 2010". The Astronomical Journal. 150 (1): 20. doi:10.1088/0004-6256/150/1/20. ISSN 1538-3881. S2CID 124222826.
- ^ Iijima, T. (2015-06-30). "New Features of the Symbiotic Recurrent Nova V407 Cygni Found in the Outburst in 2010". The Astronomical Journal. 150 (1): 20. doi:10.1088/0004-6256/150/1/20. ISSN 1538-3881. S2CID 124222826.
- ^ Inaf, Ufficio stampa (2020-06-29). "Lo shock della prima nova gamma". MEDIA INAF (in Italian). Retrieved 2020-12-11.
- ^ Ufficio stampa Inaf (2020-06-29). "Lo shock della prima nova gamma". MEDIA INAF (in Italian). Retrieved 2020-12-09.
- ^ Giroletti, M.; Munari, U.; Körding, E. (2020-06-01). "Very long baseline interferometry imaging of the advancing ejecta in the first gamma-ray nova V407 Cygni". Astronomy & Astrophysics. 638: A130. doi:10.1051/0004-6361/202038142. S2CID 218628669. Retrieved 2020-12-09.
Cite error: A list-defined reference named "SIMBAD" is not used in the content (see the help page).
Cite error: A list-defined reference named "Iijima" is not used in the content (see the help page).
See also
[edit][[Category:Mira variables]]