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Title: A SEARCH FOR NEAR INFRARED BANDS OF THE FULLERENE CATION C{sub 60}{sup +} IN THE PROTOPLANETARY NEBULA IRAS 01005+7910

IRAS 01005+7910 is a carbon-rich protoplanetary nebula with a recently reported detection of mid-IR vibrational transitions of the fullerene C{sub 60} by Zhang and Kwok. We present new high spectral resolution (R ∼ 57, 000) observations of this object obtained at the 3.6 m Telescopio Nazionale Galileo, showing the presence of two absorption bands at 9577 and 9632 Å which are consistent with laboratory measurements of the C{sub 60}{sup +} cation. If these two bands were produced by C{sub 60}{sup +} in the material surrounding the central post-asymptotic giant branch star, we estimate that ∼1% of carbon could be trapped in this ionized form of fullerenes which would be more abundant than the neutral species in this protoplanetary nebulae. The central star with an effective temperature of T ≥ 20, 000 K can provide the ionizing photons required. These observations bring further evidence for the presence of fullerenes in protoplanetary nebulae and suggest that a significant production takes place in this late stage of stellar evolution. Mid-IR bands of C{sub 60}{sup +} could be present in the 7-20 μm spectrum of IRAS 01005+7910 and are also likely to be detected in the spectra of planetary nebulae. High-resolution spectroscopy will bemore » required for a reliable determination of the excitation temperatures and the relative abundance of neutral and ionized fullerenes in these objects.« less
Authors:
;  [1]
  1. Instituto de Astrofísica de Canarias, C/Via Láctea s/n, E-38200 La Laguna (Spain)
Publication Date:
OSTI Identifier:
22215410
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 776; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CATIONS; DETECTION; FULLERENES; MOLECULES; PLANETARY NEBULAE; PROTOPLANETS; RESOLUTION; SPECTRA; SPECTROSCOPY; STAR EVOLUTION; STARS