Mz 1


Mz 1 , is a bipolar planetary nebula in the constellation Norma.

Characteristics

Menzel 1 is a bright PN 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. In 1992 Schwarz, Corradi, & Melnick published narrow band images of Mz 1 in Hα and . H2 emission was observed in Mz 1 by
Webster, Payne, Storey, Dopita. However, despite its relative brightness, Mz 1 has only been studied in a few papers.

History

Mz 1 was discovered by Donald Howard Menzel in 1922.