HST and VLT observations of the Symbiotic Star Hen 2-147

Details HST and VLT observations of the Symbiotic Star Hen 2-147 HST and VLT observations of the Symbiotic Star Hen 2-147

2007-01-14

arxiv.org/abs/astro-ph/0701404v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A; 16 pages, 13 figures

Scientific paper

We investigate the dynamics of the nebula around the symbiotic star Hen 2-147, determine its expansion parallax, and compare it with the distance obtained via the Period-Luminosity relation for its Mira variable. The geometry of the nebula is found to be that of a knotty annulus of ionized gas inclined to the plane of sky and expanding with a velocity of ~90 km/s. A straightforward application of the expansion parallax method provides a distance of 1.5+-0.4 kpc, which is a factor of two lower than the distance of 3.0+-0.4 kpc obtained from the Period-Luminosity relationship for the Mira (which has a pulsation period of 373 days). The discrepancy is removed if, instead of expanding matter, we are observing the expansion of a shock front in the plane of the sky. This shock interpretation is further supported by the broadening of the nebular emission lines.

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