A dataset provided by the European Space Agency

Name OT1_tgull_3
Title The Homunculus: Clues to Massive Ejection from the Most Massive Stars
URL

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DOI 10.5270/esa-v8nlvqk
Author gull, t.
Description Eta Carinae is a lynchpin between mass ejection by highly evolved massive stars and the enriched ISM. The Homunculus, a very dusty, neutral bipolar shell ejected in the 1840s, is known to contain at least 12 solar masses, based upon gas-dust=100. But this ejecta is very N-rich with C and O being 0.02 that of solar abundance. What dust formed and how much total mass was ejected? Our ultimate goal is to obtain the total ejected mass. We propose to obtain full spectral scans of the Homunculus with PACS and SPIRES and selected scans with HIFI. We will use these spectra to identify molecules and atomic species associated with this C- and O-depleted gas. While most of this depletion is due to CNO processing and conduction in stars > 60 solar masses, additional depletion is likely due to the first molecules and dust formed at high temperatures during the 1840s eruption. In line of sight we see overabundances of metals not ordinarily seen in the ISM: Sr, Sc, V. These metals have been trapped in atomic state due to limited O and C being available to form molecules. Yet dust has still formed. But what kind of dust? Through existing HST-STIS and VLT-UVES spectra combined with the proposed Herschel spectra and detailed modeling, we will gain much better insight on how molecules and dust can formed in depleted C,O conditions, and in turn provide an improved estimate of the total mass loss. Implications from this study apply to the first massive stars and the earliest dust in the Universe.
Publication
Instrument SPIRE_SpireSpectrometer_, HIFI_HifiPoint_dbs, PACS_PacsRangeSpec_point, HIFI_HifiFS_freq, PACS_PacsRangeSpec_large
Temporal Coverage 2011-08-06T12:52:12Z/2013-02-06T01:32:50Z
Version SPG v14.2.2
Mission Description Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 ┬Ám range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/herschel/
Date Published 2013-08-06T01:20:05Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-08-06T01:20:05Z, OT1_tgull_3, SPG v14.2.2. https://doi.org/10.5270/esa-v8nlvqk