The distance and size of the red hypergiant NML Cygni from VLBA and VLA astrometry

Author： Zhang B.   Reid M. J.   Menten K. M.   Zheng X. W.   Brunthaler A.  

Publisher： Edp Sciences

E-ISSN： 1432-0746|544|issue|A42-A42

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.544, Iss.issue, 2012-07, pp. : A42-A42

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Abstract

Context. The red hypergiant NML Cyg has been assumed to be at part of the Cyg OB2 association, although its distance has never been measured directly. A reliable distance is crucial to study the properties of this prominent star. For example, its luminosity, and hence its position on the H-R diagram, is critical information to determine its evolutionary status. In addition, a detection of the radio photosphere would be complementary to other methods of determining the stellar size.

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