Proper Motions of Dust Shells Surrounding NML Cygni

Details Proper Motions of Dust Shells Surrounding NML Cygni Proper Motions of Dust Shells Surrounding NML Cygni

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...555..405d&link_type=abstract

The Astrophysical Journal, Volume 555, Issue 1, pp. 405-409.

Astronomy and Astrophysics

Astronomy

9

Stars: Circumstellar Matter, Infrared: Stars, Stars: Individual (Nml Cygni), Techniques: Interferometric

Scientific paper

The distribution of dust emitted by the supergiant star NML Cygni has been resolved by interferometry at 11 μm wavelengths at various times over a period of 6 yr. Results show there are two discrete dust shells, which have both moved away from the star approximately the same amount during the 6 yr period. This allows determination of the time between ejection of material forming the two shells to be 65+/-14 yr. Assuming the radial outflow velocity can be derived from Doppler-measured velocities of masers surrounding the star, its distance can be calculated from the observed angular motion to be 1220+/-300 pc. This decreases the luminosity of the star by about 1 mag over that deduced from the distance 1900 pc previously assumed.

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