UV monochromatic imaging of the protoplanetary nebula hen 3-1475 using HST STIS

DOI: 
10.3390/galaxies6040141
Publication date: 
14/12/2018
Main author: 
Fang X.
IAA authors: 
Guerrero, M.A.
Authors: 
Fang X., Guerrero M.A., de Castro A.I.G., Toalá J.A., Balick B., Riera A.
Journal: 
Galaxies
Refereed: 
Yes
Publication type: 
Article
Volume: 
6
Number: 
141
Abstract: 
Collimated outflows and jets play a critical role in shaping planetary nebulae (PNe), especially in the brief transition from a spherical AGB envelope to an aspherical PN, which is called the protoplanetary nebula (pPN) phase. We present UV observations of Hen 3-1475, a bipolar pPN with fast, highly collimated jets, obtained with STIS on board the Hubble Space Telescope (HST). The deep, low-dispersion spectroscopy enabled monochromatic imaging of Hen 3-1475 in different UV nebular emission lines; this is the first of such attempt ever conducted for a pPN. The northwest inner knot (NW1) is resolved into four components in Mg II λ2800. Through comparison analysis with the HST optical narrowband images obtained 6 yr earlier, we found that these components of NW1 hardly move, despite of a negative gradient of high radial velocities, from -1550 kms-1 on the innermost component to ~-300 kms-1 on the outermost. These NW1 knot components might thus be quasi-stationary shocks near the tip of the conical outflow of Hen 3-1475. © 2018 by the authors.
Database: 
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85059403999&doi=10.3390%2fgalaxies6040141&partnerID=40&md5=9bb44cfb80b7ccbe1598c05fcccb780a
Keywords: 
Late stage stellar evolution; Planetary nebulae; Theory and observation