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Mz 1
From Wikipedia, the free encyclopedia
| Planetary nebula | Lists of nebulae |
|---|---|
| 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] |
| Notable features | |
| Other designations | ESO 135-11[1] |
Mz 1 (Menzel 1) is a bipolar planetary nebula (PN) in the constellation Norma.
Contents |
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)
Mz 1 was discovered by Donald Howard Menzel in 1922.(Menzel 1922)
- ^ 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)
- Menzel, D. N. (1922), "Five new planetary nebulae.", Harvard Bull. 177
- Monteiro, Hektor; Hugo E. Schwarz & Ruth Gruenwald et al. (2005), "Three-Dimensional Photoionization Structure and Distances of Planetary Nebulae. II. Menzel 1", The Astrophysical Journal 620(1): 321-329
- SIMBAD (January 11, 2007), Results for PN Mz 1, SIMBAD, Centre de Données Astronomiques de Strasbourg
- Gottlieb, Steve & Kent Wallace (July 15, 2005), "Results for Mz 1", Doug Snyder's Planetary Nebulae Web Site