MERLIN observations of bipolar outflow from HM Sagittae

S. P. S. Eyres, H.t. Kenny, R. J. Cohen, H. M. Lloyd, S. M. Dougherty, R. J. Davis, M. F. Bode

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid


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.

Iaith wreiddiolSaesneg
Tudalennau (o-i)317-323
CyfnodolynMonthly Notices of the Royal Astronomical Society
Rhif cyhoeddi1
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 1 Mai 1995

Ôl bys

Gweld gwybodaeth am bynciau ymchwil 'MERLIN observations of bipolar outflow from HM Sagittae'. Gyda’i gilydd, maen nhw’n ffurfio ôl bys unigryw.

Dyfynnu hyn