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Narrow polarized components in the OH 1612-MHz maser emission from supergiant OH-IR sources (1987)

Downs, G. ; Grimm, M. ; Stevens, G. ; [et al.]

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Publication Date: 2011-08-19

Description: High-resolution (300 Hz) OH 1612-MHz spectra of the supergiant OH-IR sources VY CMa, VX Sgr, IRC 10420, and NML Cyg are presented. Linewidths as small as 550 Hz (0.1 km/s) are found for narrow components in the spectra. The present results are consistent with current models for maser line-narrowing and for the physical properties in the OH maser regions. A significant degree of circular polarization is noted in many of the narrow components. The circular polarization suggests the presence of magnetic fields of about 1 mG in the circumstellar envelopes which would be strong enough to influence the outflow from the stars, and which may explain asymmetries found in the circumstellar envelopes.

Keywords: ASTROPHYSICS

Type: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711); 225; 491-498

Format: text

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