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On Infrared Excesses Associated With Li-Rich K Giants

Rebull, Luisa M. and Carlberg, Joleen K. and Gibbs, John C. and Deeb, J. Elin and Larsen, Estefania and Black, David V. and Altepeter, Shailyn and Bucksbee, Ethan and Cashen, Sarah and Clarke, Matthew and Datta, Ashwin and Hodgson, Emily and Lince, Megan (2015) On Infrared Excesses Associated With Li-Rich K Giants. Astronomical Journal, 150 (4). Art. No. 123. ISSN 0004-6256.

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Infrared (IR) excesses around K-type red giants (RGs) have previously been discovered using IRAS data, and past studies have suggested a link between RGs with overabundant Li and IR excesses, implying the ejection of circumstellar shells or disks. We revisit the question of IR excesses around RGs using higher spatial resolution IR data, primarily from WISE. Our goal was to elucidate the link between three unusual RG properties: fast rotation, enriched Li, and IR excess. We have 316 targets thought to be K giants, about 40% of which we take to be Li-rich. In 24 cases with previous detections of IR excess at low spatial resolution, we believe that source confusion is playing a role, in that either (a) the source that is bright in the optical is not responsible for the IR flux, or (b) there is more than one source responsible for the IR flux as measured in IRAS. We looked for IR excesses in the remaining sources, identifying 28 that have significant IR excesses by ~20 µm (with possible excesses for 2 additional sources). There appears to be an intriguing correlation in that the largest IR excesses are all in Li-rich K giants, though very few Li-rich K giants have IR excesses (large or small). These largest IR excesses also tend to be found in the fastest rotators. There is no correlation of IR excess with the carbon isotopic ratio, ^(12)C/^(13)C. IR excesses by 20 µm, though relatively rare, are at least twice as common among our sample of Li-rich K giants. If dust shell production is a common by-product of Li enrichment mechanisms, these observations suggest that the IR excess stage is very short-lived, which is supported by theoretical calculations. Conversely, the Li-enrichment mechanism may only occasionally produce dust, and an additional parameter (e.g., rotation) may control whether or not a shell is ejected.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle Paper
http://nitarp.ipac.caltech.eduOrganizationNASA/IPAC Teacher Archive Research Program
Rebull, Luisa M.0000-0001-6381-515X
Additional Information:© 2015 The American Astronomical Society. Received 2015 May 18; accepted 2015 July 2; published 2015 September 28. Support provided for this work by the NASA/IPAC Teacher Archive Research Program (NITARP;, which partners small groups of high school educators with a mentor astronomer for an authentic research project. It receives funding from the NASA ADP program and the IPAC archives. We acknowledge the following students who helped out at various phases of this project: Rosie Buhrley, Julie Herring, Kendall Jacoby, and Elena Mitchell, from Walden School of Liberal Arts. J. K. C. was supported by an appointment to the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by Oak Ridge Associated Universities through a contract with NASA. This research has made extensive use of the NASA/ IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. The Digitized Sky Survey was produced at the Space Telescope Science Institute under U.S. Government grant NAG W-2166. The images of these surveys are based on photographic data obtained using the Oschin Schmidt Telescope on Palomar Mountain and the UK Schmidt Telescope. The plates were processed into the present compressed digital form with the permission of these institutions." Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The SDSS-III web site is SDSS-III is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS-III Collaboration including the University of Arizona, the Brazilian Participation Group, Brookhaven National Laboratory, University of Cambridge, Carnegie Mellon University, University of Florida, the French Participation Group, the German Participation Group, Harvard University, the Instituto de Astrofisica de Canarias, the Michigan State/Notre Dame/JINA Participation Group, Johns Hopkins University, Lawrence Berkeley National Laboratory, Max Planck Institute for Astrophysics, Max Planck Institute for Extraterrestrial Physics, New Mexico State University, New York University, Ohio State University, Pennsylvania State University, University of Portsmouth, Princeton University, the Spanish Participation Group, University of Tokyo, University of Utah, Vanderbilt University, University of Virginia, University of Washington, and Yale University. This publication makes use of data products from the 2MASS, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. This research is based on observations with AKARI, a JAXA project with the participation of ESA. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. This research made use of data products from the Midcourse Space Experiment. Processing of the data was funded by the Ballistic Missile Defense Organization with additional support from NASA Office of Space Science. This research has also made use of the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research has made use of NASA's Astrophysics Data System (ADS) Abstract Service, and of the SIMBAD database, operated at CDS, Strasbourg, France.
Errata:Luisa M. Rebull et al 2016 The Astronomical Journal 152 52
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
NASA/IPAC Teacher Archive Research Program (NITARP)UNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Ballistic Missile Defense OrganizationUNSPECIFIED
Participating InstitutionsUNSPECIFIED
NASA Postdoctoral ProgramUNSPECIFIED
Subject Keywords:infrared: stars – stars: evolution – stars: late-type
Issue or Number:4
Record Number:CaltechAUTHORS:20151015-095353742
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Official Citation:Luisa M. Rebull et al 2015 The Astronomical Journal 150 123
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61142
Deposited By: Tony Diaz
Deposited On:15 Oct 2015 17:04
Last Modified:03 Oct 2019 09:04

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