A dataset provided by the European Space Agency

Name OT1_gclayton_1
Title Clues to the Evolutionary History of the R Coronae Borealis Stars
URL

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DOI https://doi.org/10.5270/esa-bcf0106
Author European Space Agency
Description The unexpected discovery that the R Coronae Borealis (RCB) stars have
isotopic abundances of 18O which are up to 500 times greater than
those seen in other stars has increased the likelihood that these rare
hydrogen-deficient carbon stars are the result of a double degenerate
white dwarf (WD) merger (DD) rather than a final helium shell flash (FF).
But other pieces of the puzzle have yet to be explained. For instance, a
few RCB stars, including R CrB itself, show enhanced Li abundances,
which favors the FF scenario. Also, IRAS images show that several RCB
stars possess large dust shells which are consistent with fossil Planetary
Nebula (PN) shells where the gas is no longer ionized. If these are PN
shells, then that would point strongly toward the FF scenario. But other
explanations for the dust shells include the FF outburst itself and new
dust from the recent RCB phase. In addition, newly acquired
Herschel/Spire images have called into question the reality of the shells
themselves. The much improved spatial resolution over previous IRAS
and MIPS images shows that some or all of the R CrB 100-micron shell
is due to a cluster of galaxies lying directly behind the star. It is
imperative that new high spatial resolution PACS and Spire images be
obtained to verify the existence of these RCB star dust shells, as well as
to analyze the morphology of the shells to deduce their nature and help
decide between the DD and the FF scenarios. Furthermore, the new
Herschel images, covering the wavelength range 70-500 microns, will be
used together with archival IRAS, Spitzer and other datasets to produce
SEDs for each star which will be modeled using Monte Carlo radiative
transfer codes to determine the total dust mass, and total mass loss over
the lifetime of the stars. It is a very exciting prospect that the RCB stars
could be... shown to be the product of a WD merger. This small group of
stars would become even more interesting as they would be low-mass
analogies to Type Ia supernovae.
Publication The Double Dust Envelopes of R Coronae Borealis Stars . Montiel Edward J. et al. . The Astronomical Journal, Volume 156, Issue 4, article id. 148, 25 pp. (2018). . 156 . 10.3847\/1538-3881\/aad772 . 2018AJ....156..148M ,
Instrument PACS_PacsPhoto_largeScan, SPIRE_SpirePhoto_large
Temporal Coverage 2011-03-13T21:45:29Z/2013-04-26T14:11:27Z
Version SPG v14.2.0
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 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/h®erschel/
Date Published 2013-10-26T13:40:30Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013, Clues To The Evolutionary History Of The R Coronae Borealis Stars, SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-bcf0106