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ⓘ NML Cygni or V1489 Cygni is a red hypergiant star. It is one of the largest stars known at present. It is about 1.640 times the Suns radius, However an older st ..




NML Cygni
                                     

ⓘ NML Cygni

NML Cygni or V1489 Cygni is a red hypergiant star. It is one of the largest stars known at present. It is about 1.640 times the Suns radius, However an older study from 2010 says it is 1.183 solar radii. It is one of the extremely luminous supergiant stars. It was discovered in 1965, by Gerry Neugebauer, D.M. Martz and Robert Leighton. The name NML comes from the names of the three discoverers.

NML Cygnis distance from Earth is about 5.250 light-years. This star has dust surrounding it. It has a bean-shaped asymmetric nebula with H 2 O vapour. It is a semiregular variable star with a period of about 940 days.

This star is a part of the Cygnus OB2 association, which is 1.74 ± 0.2 kpc away. This is one of the nearest massive star groups to the Sun. This group includes some of the most massive and most luminous stars known, including the suspected luminous blue variable Cyg OB2 #12. NML Cyg is a massive oxygen-rich star. Molecules like H 2 O, SiO, CO, HCN, CS, SO, SO 2 and H 2 S are also present.

NML Cygni has two dense envelopes of dust and molecules. The star has one of the largest mass loss rates at around 2 × 10 -4 M ☉ per year. These dust envelopes are formed by the high mass emission rate.

                                     
  • Cyg OB2 12. The cluster also includes one of the largest known stars, NML Cygni The region is inside an even larger area of star formation called Cygnus
  • to explode to a Supernova and then turn into a Black hole. VV Cephei NML Cygni Stephenson 2 - 18 UY Scuti List of largest stars Wittkowski M. et al 2012
  • which is about 1700 times wider than the Sun. Another large hypergiant is NML Cygni about 1, 650 times wider than the Sun. It is one of the extreme luminous
  • Brunthaler, A. 2012 The distance and size of the red hypergiant NML Cygni from VLBA and VLA astrometry Astronomy & Astrophysics. 544: A42. arXiv: 1207