First OH polarimetric images of NML Cyg

Details First OH polarimetric images of NML Cyg First OH polarimetric images of NML Cyg

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..283..317e&link_type=abstract

In: Mass-losing pulsating stars and their circumstellar matter. Workshop, May 13-16, 2002, Sendai, Japan, edited by Y. Nakada, M

Astronomy and Astrophysics

Astrophysics

Masers, Techniques: Interferometry, Polarisation, Stars: Circumstellar Matter, Stars: Supergiant

Scientific paper

MERLIN interferometric observations of the supergiant NML Cyg were obtained in October 1993 in full polarisation, at 1612 and 1665 MHz. They reveal a complex distribution of the vectors of polarisation. At 1612 MHz, the majority of the components lies along a NW-SE geometrical axis along which a velocity gradient is clearly evident. The vectors of polarisation associated with these maser spots are roughly aligned on that same NW-SE axis. The distribution of the external and fainter components is spherical and the associated vectors of polarisation have a tangential distribution. At 1665 MHz, the maser spot distribution reveals an incomplete spherical shell for which the associated vectors of polarisation also show a tangential distribution. This dichotomy strongly suggests the existence of two distinct OH shells.

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