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HST and VLT observations of the Symbiotic Star Hen 2-147 | | M. Santander-Garcia
; R. L. M. Corradi
; P. A. Whitelock
; U. Munari
; A. Mampaso
; F. Marang
; F. Boffi
; M. Livio
; | | Date: |
14 Jan 2007 | | Abstract: | 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. | | Source: | arXiv, astro-ph/0701404 | | Services: | Forum | Review | PDF | Favorites | |
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