- Mz 1
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Menzel 1 Observation data
(Epoch J2000)Right ascension 15h 34m 17.002s[1] Declination -59° 09′ 09.05″[1] Distance 3,400 ± 500 ly (1,050 ± 150 pc)[2] Apparent magnitude (V) 12.0[3] Apparent dimensions (V) 76″[2] × 23″[3] Constellation Norma Physical characteristics Radius 0.63 ± 0.09 ly[a] Absolute magnitude (V) 1.9 ± 0.3[b] Other designations ESO 135-11[1] See also: Planetary nebula, Lists of nebulae Mz 1 (Menzel 1), is a bipolar planetary nebula (PN) in the constellation Norma.
Contents
Characteristics
Menzel 1 is a bright PN that has a prominent central ring of enhanced emission. One model of its structure is a 3 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 et al. 2005)
History
Mz 1 was discovered by Donald Howard Menzel in 1922. (Menzel 1922)
External links
Notes
- ^ 3,400 ± 500[2] ly distance × sin( 76″[2] diameter_angle / 2 ) = 0.63 ± 0.09 ly. radius
- ^ 12.0[3] apparent magnitude - 5 * (log10(1,050 ± 150[2] pc distance) - 1) = 1.9 ± 0.3 absolute magnitude
- ^ a b c SIMBAD 2007
- ^ a b c d e Monteiro et al. 2005
- ^ a b c Gottlieb & Wallace 2005
References
- Gottlieb, Steve; Wallace, Kent (July 15, 2005), "Results for Mz 1", Doug Snyder's Planetary Nebulae Web Site (Doug Snyder), http://www.blackskies.org/reports05.htm#Mz1
- Menzel, D. N. (1922), "Five new planetary nebulae", Harvard Bull. 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", The Astrophysical Journal 620 (1): 321–329, arXiv:astro-ph/0410496, Bibcode 2005ApJ...620..321M, doi:10.1086/426809
- 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
Categories:- Planetary nebulae
- Norma constellation
- Astronomical objects discovered in 1922
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