Sh2-313 in Hydra (M.J. Post)

Celestial hemisphere: Southern · Constellation: Hydra (Hya) · Contains: PK303+40.1 · Sh2-313

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Sh2-313 in Hydra

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Sh2-313 in Hydra

This is a complex system studied by many and still controversial. Current thinking is that it is a combination of two systems: 1) An old planetary nebula produced by a binary central star system. The dominant star seen here is a G8 star, not hot enough to ionize and cause all the emission we now see. The planetary nebula probably resulted from death of the second star which is now a very hot white dwarf. The dwarf causes all the ionization and emission we see. The pair is generating a systematic "solar" wind that is blowing outward at Mach 1.3 through the old planetary debris, causing the central bow shock wave. 2) This entire system is plowing through the interstellar medium (ISM) at Mach 10, causing the linear shock features seen at the bottom and top of the emission complex. Hydrogen in the ISM is being ionized by the 80K - 100K white dwarf, hence the detection and designation of this system as an HII object by Sharpless (SH2-313).

If you look radially upward from the central star, you might see two small galaxies shining through the old planetary debris.

Resolution is not good because I included subframes from good and bad seeing, moon and no moon, etc. in an attempt to bring out details in the nebulae.

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Status	Advanced success
Started	...
Astrometry.net job	4614319
PixInsight job	UX2FNBF4O6CZKI0VH14LTR11O1EA42PH
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	12h53m32s.214
RA (top/left)	12h54m22s.857
RA (top/right)	12h52m41s.264
RA (bottom/right)	12h52m41s.433
RA (bottom/left)	12h54m23s.238

Dec (center)	-22°52′20″.40
Dec (top/left)	-22°44′28″.50
Dec (top/right)	-22°44′34″.40
Dec (bottom/right)	-23°00′11″.57
Dec (bottom/left)	-23°00′05″.83

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Sh2-313 in Hydra

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