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HST and VLT observations of the Symbiotic Star Hen 2-147 by Santander-Garcia, M.; Corradi, R. L. M.; Whitelock, P. A.; Munari, U.; Mampaso, A.; Marang, F.; Boffi, F.; Livio, M. is a scholarly article available to read on EtoBox.

What is HST and VLT observations of the Symbiotic Star Hen 2-147 about?

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.

Author

Santander-Garcia, M.; Corradi, R. L. M.; Whitelock, P. A.; Munari, U.; Mampaso, A.; Marang, F.; Boffi, F.; Livio, M.

Published

2007

Language

EN