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Open AccessArticle

UV Monochromatic Imaging of the Protoplanetary Nebula Hen 3-1475 Using HST STIS

1
Laboratory for Space Research, Faculty of Science, University of Hong Kong, Pokfulam Road, Hong Kong, China
2
Department of Physics, Faculty of Science, University of Hong Kong, Pokfulam Road, Hong Kong, China
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Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de la Astronomía s/n, E-18008 Granada, Spain
4
AEGORA Research Group, Facultad de Ciencias, Universidad Complutense, E-28040 Madrid, Spain
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Instituto de Radioastronomía y Astrofísica, UNAM Campus Morelia, Apartado Postal 3-72, Morelia 58090, Michoacán, Mexico
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Department of Astronomy, University of Washingtgon, Seattle, WA 98 195-1580, USA
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Departament de Física i Enginyeria Nuclear, EUETIB, Universitat Politécnica de Catalunya, E-08036 Barcelona, Spain
*
Author to whom correspondence should be addressed.
Galaxies 2018, 6(4), 141; https://doi.org/10.3390/galaxies6040141
Received: 8 August 2018 / Revised: 10 December 2018 / Accepted: 11 December 2018 / Published: 14 December 2018
(This article belongs to the Special Issue Asymmetric Planetary Nebulae VII)
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 λ 2800. 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 km s - 1 on the innermost component to ∼−300 km s - 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. View Full-Text
Keywords: late stage stellar evolution; planetary nebulae; theory and observation late stage stellar evolution; planetary nebulae; theory and observation
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Fang, X.; Guerrero, M.A.; Gómez de Castro, A.I.; Toalá, J.A.; Balick, B.; Riera, A. UV Monochromatic Imaging of the Protoplanetary Nebula Hen 3-1475 Using HST STIS. Galaxies 2018, 6, 141.

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