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17th European White Dwarf Workshop: Two Planetary Nuclei with Recent Mass-Loss Episodes
Bond, Howard (2010)
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mla
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Bond H. "17th European White Dwarf Workshop: Two Planetary Nuclei with Recent Mass-Loss Episodes.", timms video, Universität Tübingen (2010): https://timms.uni-tuebingen.de:443/tp/UT_20100818_001_eurowd_0001. Accessed 29 Oct 2020.
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Bond, H. (2010). 17th European White Dwarf Workshop: Two Planetary Nuclei with Recent Mass-Loss Episodes. timms video: Universität Tübingen. Retrieved October 29, 2020 from the World Wide Web https://timms.uni-tuebingen.de:443/tp/UT_20100818_001_eurowd_0001
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Bond, H. (2010). 17th European White Dwarf Workshop: Two Planetary Nuclei with Recent Mass-Loss Episodes [Online video]. 18 August. Available at: https://timms.uni-tuebingen.de:443/tp/UT_20100818_001_eurowd_0001 (Accessed: 29 October 2020).
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title: 17th European White Dwarf Workshop: Two Planetary Nuclei with Recent Mass-Loss Episodes
alt. title: 17th European White Dwarf Workshop - Central stars of planetary nebulae
creator: Bond, Howard (author)
subjects: Astronomie, Physik, Astrophysik, Workshop, White Dwarf, Two Planetary Nuclei, Recent Mass-Loss Episodes, Howard Bond
description: 17th European White Dwarf Workshop, 16. bis 20. August 2010
abstract: Two Planetary Nuclei with Recent Mass-Loss Episodes (Howard E. Bond) (Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 USA) I will describe recent space- and ground-based observations of two planetary-nebula nuclei (PNNi) that have shown episodes of mass loss in the recent past. 1. V605 Aquilae, the hydrogen-deficient central star of the PN Abell 58, underwent an outburst around 1919, attributed to a final helium shell flash in a WD at the top of the cooling track. I will describe our recent imaging of V605 Aql with the Hubble Space Telescope (HST). We obtained both a continuum image through polarizing filters, and direct images in [O III] and [N II]. The narrow-band images show a resolved nebula with a diameter of about 1"; comparison with earlier H STimages clearly reveals angular expansion, consistent with ejection of the nebul a during the 1919 outburst. The compact nebula has a dark band passing across its center, interpreted as a dense dusty disk surrounding the PNN. Remarkably, the large and faint PN A 58, ejected many thousands of years ago and long before the final-flash event, has the same axis as this newly ejected material. The continuum image, dominated by C IV emission from the PNN, shows a "hot spot", adjacent to the dark band, which we belve is the central star - now hot for a second time - viewed through considerable dust extinction. 2. Longmore 4 is a second PN containing a hydrogen-deficient central star, a pulsating member of the PG 1159 class of WDs. I have monitored the optical spectrum of Lo 4 regularly over the past several years, using the SMARTS 1.5m telescope at Cerro Tololo. At irregular intervals, the spectrum of Lo 4 changes from PG 1159 white dwarf to a W-R spectral type for a few days, indicating episodes of mass ejection. I will review our current knowledge of this remarkable and unexplained phenomenon.
publisher: ZDV Universität Tübingen
contributor: ZDV Universität Tübingen (producer)
creation date: 2010-08-18
dc type: image
localtype: video
identifier: UT_20100818_001_eurowd_0001
language: eng
rights: Url: https://timmsstatic.uni-tuebingen.de/jtimms/TimmsDisclaimer.html?637395675127151669