HyperLink HyperLink

Featured Report


NML Cygni

NML Cygni H-Alpha light image of Cygnus OB2, the stellar association in which NML Cygni is located Observation data Epoch J2000      Equinox J2000 Constellation Cygnus Right ascension 20h 46m 25.6s Declination +40° 06' 59.4? Apparent magnitude (V) 16.60 Characteristics Spectral type M6I B-V color index 2.0 Variable type Semiregular Astrometry Proper motion (µ) RA: -1.55 mas/yr Dec.: -4.59 mas/yr Parallax (p) 0.620 ± 0.047 mas Distance 1.61k pc Details Mass 25–40 M? Radius 1,642–2,775 R? Luminosity 270,000 L? Other designations Database references SIMBAD data NML Cygni or V1489 Cygni is a red hypergiant and one of the largest stars currently known with a radius about 1,650 times the Sun's, equal to 7.67 astronomical units. Its distance from Earth is estimated to be around 1.6 kpc, or about 5,300 light-years.NML Cygni is a part of the Cygnus OB2 association, one of the closest massive associations to the Sun spanning nearly 2° on the sky, or ~30 pc in radius at the distance of 1.74 ± 0.2 kpc. ^ Monnier, J. D.; Millan-Gabet, R.; Tuthill, P. G.; Traub, W. A.; Carleton, N. P.; Coude Du Foresto, V.; Danchi, W. C.; Lacasse, M. G.; Morel, S.; Perrin, G.; Porro, I. L.; Schloerb, F. P.; Townes, C. H. (2004). "High-Resolution Imaging of Dust Shells by Using Keck Aperture Masking and the IOTA Interferometer". The Astrophysical Journal 605: 436. arXiv:astro-ph/0401363. Bibcode:2004ApJ...605..436M. doi:10.1086/382218.  edit ^ a b c d e f g h i Zhang, B.; Reid, M. J.; Menten, K. M.; Zheng, X. W.; Brunthaler, A. (2012). "The distance and size of the red hypergiant NML Cygni from VLBA and VLA astrometry". Astronomy & Astrophysics 544: A42. arXiv:1207.1850. Bibcode:2012A&A...544A..42Z. doi:10.1051/0004-6361/201219587.  edit ^ a b Schuster, Michael Thomas (2007). Investigating the Circumstellar Environments of the Cool Hypergiants. ProQuest. p. 57. ISBN 978-0-549-32782-0. Retrieved 27 August 2012.  ^ Cite error: The named reference Imaging_the_Cool_Hypergiant_NML_Cygni.E2.80.99s_Dusty_Circumstellar_Envelope_with_Adaptive_Optics was invoked but never defined (see the help page).
Created By: System
Join To Create/Save Reports
Forgot Password

Related Reports