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Article: A spitzer study of 21 and 30μm emission in several galactic carbon-rich protoplanetary nebulae

TitleA spitzer study of 21 and 30μm emission in several galactic carbon-rich protoplanetary nebulae
Authors
KeywordsCircumstellar Matter
Infrared: Stars
Planetary Nebulae: General
Radiative Transfer
Stars: Agb And Post-Agb
Issue Date2009
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2009, v. 694 n. 2, p. 1147-1160 How to Cite?
AbstractWe have carried out mid-infrared spectroscopy of seven Galactic protoplanetary nebulae (PPNs) using the Spitzer Space Telescope. They were observed from 10 to 36μm at relatively high spectral resolution, R 600. The sample was chosen because they all gave some evidence in the visible of a carbon-rich chemistry. All seven of the sources show the broad, unidentified 21μm emission feature; three of them are new detections (IRAS 06530 - 0213, 07430+1115, and 19477+2401) and the others are observed at higher signal-to-noise ratio than in previous spectra. These have the same shape and central wavelength (20.1μm) as found in the Infrared Space Observatory (ISO) spectra of the brighter PPNs. The 30μm feature was seen in all seven objects. However, it is not resolved into two separate features (26 and 33μm) as was claimed on the basis of ISO spectra, which presumably suffered from the noisy detector bands in this region. All showed the aromatic infrared bands at 11.3, 12.4, and 13.3μm. Five of these also appear to have the C 2H 2 molecular band at 13.7μm, one in absorption and four in emission. This is extremely rare, with only one other evolved star, IRC+10216, in which C 2H 2 emission has been observed. Four also possessed a broad, unidentified emission feature at 15.8μm that may possibly be related to the 21μm feature. Model fits were made to the spectral energy distributions for these PPNs to determine properties of the detached circumstellar envelopes. The 21μm feature has been seen in all Galactic carbon-rich PPNs observed, and thus its carrier appears to be a common component of the outflow around these objects. © 2009 The American Astronomical Society.
Persistent Identifierhttp://hdl.handle.net/10722/179716
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorHrivnak, BJen_US
dc.contributor.authorVolk, Ken_US
dc.contributor.authorKwok, Sen_US
dc.date.accessioned2012-12-19T10:03:12Z-
dc.date.available2012-12-19T10:03:12Z-
dc.date.issued2009en_US
dc.identifier.citationAstrophysical Journal Letters, 2009, v. 694 n. 2, p. 1147-1160en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/10722/179716-
dc.description.abstractWe have carried out mid-infrared spectroscopy of seven Galactic protoplanetary nebulae (PPNs) using the Spitzer Space Telescope. They were observed from 10 to 36μm at relatively high spectral resolution, R 600. The sample was chosen because they all gave some evidence in the visible of a carbon-rich chemistry. All seven of the sources show the broad, unidentified 21μm emission feature; three of them are new detections (IRAS 06530 - 0213, 07430+1115, and 19477+2401) and the others are observed at higher signal-to-noise ratio than in previous spectra. These have the same shape and central wavelength (20.1μm) as found in the Infrared Space Observatory (ISO) spectra of the brighter PPNs. The 30μm feature was seen in all seven objects. However, it is not resolved into two separate features (26 and 33μm) as was claimed on the basis of ISO spectra, which presumably suffered from the noisy detector bands in this region. All showed the aromatic infrared bands at 11.3, 12.4, and 13.3μm. Five of these also appear to have the C 2H 2 molecular band at 13.7μm, one in absorption and four in emission. This is extremely rare, with only one other evolved star, IRC+10216, in which C 2H 2 emission has been observed. Four also possessed a broad, unidentified emission feature at 15.8μm that may possibly be related to the 21μm feature. Model fits were made to the spectral energy distributions for these PPNs to determine properties of the detached circumstellar envelopes. The 21μm feature has been seen in all Galactic carbon-rich PPNs observed, and thus its carrier appears to be a common component of the outflow around these objects. © 2009 The American Astronomical Society.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_US
dc.relation.ispartofAstrophysical Journal Lettersen_US
dc.rightsThe Astrophysical Journal. Copyright © University of Chicago Press.-
dc.subjectCircumstellar Matteren_US
dc.subjectInfrared: Starsen_US
dc.subjectPlanetary Nebulae: Generalen_US
dc.subjectRadiative Transferen_US
dc.subjectStars: Agb And Post-Agben_US
dc.titleA spitzer study of 21 and 30μm emission in several galactic carbon-rich protoplanetary nebulaeen_US
dc.typeArticleen_US
dc.identifier.emailKwok, S: deannote@hku.hken_US
dc.identifier.authorityKwok, S=rp00716en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1088/0004-637X/694/2/1147en_US
dc.identifier.scopuseid_2-s2.0-67549124405en_US
dc.identifier.hkuros156358-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-67549124405&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume694en_US
dc.identifier.issue2en_US
dc.identifier.spage1147en_US
dc.identifier.epage1160en_US
dc.identifier.isiWOS:000264538900035-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridHrivnak, BJ=35613962100en_US
dc.identifier.scopusauthoridVolk, K=7006571965en_US
dc.identifier.scopusauthoridKwok, S=22980498300en_US

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