MERLIN observations of bipolar outflow from HM Sagittae

Details MERLIN observations of bipolar outflow from HM Sagittae MERLIN observations of bipolar outflow from HM Sagittae

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.274..317e&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 274, Issue 1, pp. 317-323.

Astronomy and Astrophysics

Astronomy

19

Binaries: Symbiotic, Circumstellar Matter, Stars: Imaging, Stars: Individual: Hm Sge, Stars: Late-Type, Radio Continuum: Stars

Scientific paper

MERLIN maps of HM Sagittae at 6-cm and 18-cm wavelengths are presented. At 6 cm, the inner nebula has been mapped at a resolution of 60 milli-arcsec (mas), revealing two parallel ridge structures to the north and south of a deep central minimum. In addition, these central features are surrounded by a complex, weak structure. The ridges and many of the weak features are correlated with ultraviolet (UV) structure observed with the Hubble Space Telescope (HST). The 18-cm map reveals elongated structure to the east and west of the stars position. There is strong evidence that the eastern and western edges of this extension are non-thermal. The E-W and N-S features are associated with components detected with optical spectroscopy. The radial velocities of these components suggest that the E-W features are a high-velocity bipolar outflow. We argue that the brightness temperature of ~ 45000K for the N-S features results from shock heating by the outflow. The resulting expansion velocity, when compared with the observed proper motion, implies a distance of 3.2 kpc.

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