Polycyclic aromatic hydrocarbons orbiting HD 233517, an evolved oxygen-rich red giant

Ciska Kemper; M. Jura; C. J. Bohac; B. Sargent; W. J. Forrest; J. Green; D. M. Watson; G. C. Sloan; F. Markwick-Kemper; C. H. Chen; J. Najita

doi:10.1086/500429

Polycyclic aromatic hydrocarbons orbiting HD 233517, an evolved oxygen-rich red giant

Ciska Kemper, M. Jura, C. J. Bohac, B. Sargent, W. J. Forrest, J. Green, D. M. Watson, G. C. Sloan, F. Markwick-Kemper, C. H. Chen, J. Najita

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Abstract

We report spectra obtained with the Spitzer Space Telescope in the X = 5-35 μm range of HD 233517, an evolved K2 III giant with circumstellar dust. For X > 13 μm, the flux is a smooth continuum that varies approximately as v-5/3. For X <13μm, although the star is oxygen-rich, PAH features produced by carbon-rich species at 6.3, 8.2, 11.3, and 12.7 μm are detected along with likely broad silicate emission near 20 μm. These results can be explained if there is a passive, flared disk orbiting HD 233517. Our data support the hypothesis that organic molecules in orbiting disks may be synthesized in situ as well as having been incorporated from the interstellar medium. © 2006. The American Astronomical Society. All rights reserved.

Original language	English
Pages (from-to)	L45-L48
Journal	Astrophysical Journal
Volume	637
Issue number	1
DOIs	https://doi.org/10.1086/500429
Publication status	Published - 20 Jan 2006

Keywords

Circumstellar matterstars: general

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10.1086/500429

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title = "Polycyclic aromatic hydrocarbons orbiting HD 233517, an evolved oxygen-rich red giant",

abstract = "We report spectra obtained with the Spitzer Space Telescope in the X = 5-35 μm range of HD 233517, an evolved K2 III giant with circumstellar dust. For X > 13 μm, the flux is a smooth continuum that varies approximately as v-5/3. For X <13μm, although the star is oxygen-rich, PAH features produced by carbon-rich species at 6.3, 8.2, 11.3, and 12.7 μm are detected along with likely broad silicate emission near 20 μm. These results can be explained if there is a passive, flared disk orbiting HD 233517. Our data support the hypothesis that organic molecules in orbiting disks may be synthesized in situ as well as having been incorporated from the interstellar medium. {\textcopyright} 2006. The American Astronomical Society. All rights reserved.",

keywords = "Circumstellar matterstars: general",

author = "Ciska Kemper and M. Jura and Bohac, {C. J.} and B. Sargent and Forrest, {W. J.} and J. Green and Watson, {D. M.} and Sloan, {G. C.} and F. Markwick-Kemper and Chen, {C. H.} and J. Najita",

year = "2006",

month = jan,

day = "20",

doi = "10.1086/500429",

language = "English",

volume = "637",

pages = "L45--L48",

journal = "Astrophysical Journal",

issn = "1538-4357",

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TY - JOUR

T1 - Polycyclic aromatic hydrocarbons orbiting HD 233517, an evolved oxygen-rich red giant

AU - Kemper, Ciska

AU - Jura, M.

AU - Bohac, C. J.

AU - Sargent, B.

AU - Forrest, W. J.

AU - Green, J.

AU - Watson, D. M.

AU - Sloan, G. C.

AU - Markwick-Kemper, F.

AU - Chen, C. H.

AU - Najita, J.

PY - 2006/1/20

Y1 - 2006/1/20

N2 - We report spectra obtained with the Spitzer Space Telescope in the X = 5-35 μm range of HD 233517, an evolved K2 III giant with circumstellar dust. For X > 13 μm, the flux is a smooth continuum that varies approximately as v-5/3. For X <13μm, although the star is oxygen-rich, PAH features produced by carbon-rich species at 6.3, 8.2, 11.3, and 12.7 μm are detected along with likely broad silicate emission near 20 μm. These results can be explained if there is a passive, flared disk orbiting HD 233517. Our data support the hypothesis that organic molecules in orbiting disks may be synthesized in situ as well as having been incorporated from the interstellar medium. © 2006. The American Astronomical Society. All rights reserved.

AB - We report spectra obtained with the Spitzer Space Telescope in the X = 5-35 μm range of HD 233517, an evolved K2 III giant with circumstellar dust. For X > 13 μm, the flux is a smooth continuum that varies approximately as v-5/3. For X <13μm, although the star is oxygen-rich, PAH features produced by carbon-rich species at 6.3, 8.2, 11.3, and 12.7 μm are detected along with likely broad silicate emission near 20 μm. These results can be explained if there is a passive, flared disk orbiting HD 233517. Our data support the hypothesis that organic molecules in orbiting disks may be synthesized in situ as well as having been incorporated from the interstellar medium. © 2006. The American Astronomical Society. All rights reserved.

KW - Circumstellar matterstars: general

U2 - 10.1086/500429

DO - 10.1086/500429

M3 - Article

SN - 1538-4357

VL - 637

SP - L45-L48

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

Polycyclic aromatic hydrocarbons orbiting HD 233517, an evolved oxygen-rich red giant

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