Astronomy:Mz 1

Short description: Planetary nebula in the constellation Norma

Menzel 1

Emission nebula
Planetary nebula
Observation data: J2000 epoch
Right ascension	15h 34m 17.002s
Declination	−59° 09′ 09.05″
Distance	3,400 ± 500 ly (1,050 ± 150 pc) ly
Apparent magnitude (V)	12.0
Apparent dimensions (V)	76″ × 23″
Constellation	Norma
Physical characteristics
Radius	0.63 ± 0.09 ly ly
Absolute magnitude (V)	1.9 ± 0.3
Designations	ESO 135-11

Mz 1 (Menzel 1), is a bipolar planetary nebula (PN) in the constellation Norma.

Characteristics

Menzel 1 is a bright planetary nebula that has a prominent central ring of enhanced emission. One model of its structure is a three-dimensional hour-glass shape with a smoothly decreasing density starting from the waist or equator as measured outwardly to the poles. It is radially expanding at a rate of about 23 km/s and estimated to be around 4,500 to 10,000 years old and has its polar axis oriented at an angle of around 40° from the plane of the sky. Its central star is estimated to have a mass of 0.63 ± 0.05 M_☉. In 1992 Schwarz, Corradi, & Melnick published narrow band images of Mz 1 in Hα and [OIII]. H₂ emission was observed in Mz 1 by Webster, Payne, Storey, Dopita (1988). However, despite its relative brightness, Mz 1 has only been studied in a few papers (Monteiro Schwarz).

History

Mz 1 was discovered by Donald Howard Menzel in 1922. (Menzel 1922)

Notes

1. ^{^} 3,400 ± 500 ly distance × sin( 76″ diameter_angle / 2 ) = 0.63 ± 0.09 ly. radius
2. ^{^} 12.0 apparent magnitude - 5 * (log₁₀(1,050 ± 150 pc distance) - 1) = 1.9 ± 0.3 absolute magnitude

References

• Gottlieb, Steve; Wallace, Kent (July 15, 2005), "Results for Mz 1", Doug Snyder's Planetary Nebulae Web Site (Doug Snyder), archived from the original on February 6, 2012, https://web.archive.org/web/20120206042522/http://www.blackskies.org/reports05.htm  (archive)
• Menzel, D. N. (1922), "Five new planetary nebulae", Harvard Bulletin 177: 0, Bibcode: 1922BHarO.777....0M 
• Monteiro, Hektor; Schwarz, Hugo E.; Gruenwald, Ruth; Guenthner, Katherine; Heathcote, Steve R. (2005), "Three-Dimensional Photoionization Structure and Distances of Planetary Nebulae. II. Menzel 1", Astrophysical Journal 620 (1): 321–329, doi:10.1086/426809, Bibcode: 2005ApJ...620..321M 
• SIMBAD (January 11, 2007), Results for PN Mz 1, SIMBAD, Centre de Données Astronomiques de Strasbourg, http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=PN+Mz+1 

External links

• http://www.astro.washington.edu/users/balick/PNIC/PNimages_by_galcoord/322.4-02.6.Mz1.jpg