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Title: HIGH-RESOLUTION OPTICAL SPECTROSCOPY OF DY Cen: DIFFUSE INTERSTELLAR BANDS IN A PROTO-FULLERENE CIRCUMSTELLAR ENVIRONMENT?

Abstract

We search high-resolution and high-quality VLT/UVES optical spectra of the hot R Coronae Borealis star DY Cen for electronic transitions of the C{sub 60} molecule and diffuse interstellar bands (DIBs). We report the non-detection of the strongest C{sub 60} electronic transitions (e.g., those at {approx}3760, 3980, and 4024 A). The absence of C{sub 60} absorption bands may support recent laboratory results, which show that the {approx}7.0, 8.5, 17.4, and 18.8 {mu}m emission features seen in DY Cen-and other similar objects with polycyclic-aromatic-hydrocarbon-like dominated IR spectra-are attributable to proto-fullerenes or fullerene precursors rather than to C{sub 60}. DIBs toward DY Cen are normal for its reddening; the only exception is the DIB at 6284 A (possibly also the 7223 A DIB) which is found to be unusually strong. We also report the detection of a new broad (FWHM {approx} 2 A) and unidentified feature centered at {approx}4000 A. We suggest that this new band may be related to the circumstellar proto-fullerenes seen at infrared wavelengths.

Authors:
 [1];  [2];  [3]
  1. Instituto de Astrofisica de Canarias, C/Via Lactea s/n, E-38200 La Laguna (Spain)
  2. 543, 17th Main, IV Sector, HSR Layout, Bangalore 560102 (India)
  3. W.J. McDonald Observatory, University of Texas, Austin, TX 78712-1083 (United States)
Publication Date:
OSTI Identifier:
22078461
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 759; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; EMISSION; ENERGY-LEVEL TRANSITIONS; FULLERENES; INFRARED SPECTRA; MOLECULES; POLYCYCLIC AROMATIC HYDROCARBONS; RESOLUTION; SPECTROSCOPY; STELLAR CORONAE; WAVELENGTHS

Citation Formats

Garcia-Hernandez, D. A., Rao, N. Kameswara, and Lambert, David L., E-mail: agarcia@iac.es, E-mail: nkrao@iiap.res.in, E-mail: dll@astro.as.utexas.edu. HIGH-RESOLUTION OPTICAL SPECTROSCOPY OF DY Cen: DIFFUSE INTERSTELLAR BANDS IN A PROTO-FULLERENE CIRCUMSTELLAR ENVIRONMENT?. United States: N. p., 2012. Web. doi:10.1088/2041-8205/759/1/L21.
Garcia-Hernandez, D. A., Rao, N. Kameswara, & Lambert, David L., E-mail: agarcia@iac.es, E-mail: nkrao@iiap.res.in, E-mail: dll@astro.as.utexas.edu. HIGH-RESOLUTION OPTICAL SPECTROSCOPY OF DY Cen: DIFFUSE INTERSTELLAR BANDS IN A PROTO-FULLERENE CIRCUMSTELLAR ENVIRONMENT?. United States. doi:10.1088/2041-8205/759/1/L21.
Garcia-Hernandez, D. A., Rao, N. Kameswara, and Lambert, David L., E-mail: agarcia@iac.es, E-mail: nkrao@iiap.res.in, E-mail: dll@astro.as.utexas.edu. Thu . "HIGH-RESOLUTION OPTICAL SPECTROSCOPY OF DY Cen: DIFFUSE INTERSTELLAR BANDS IN A PROTO-FULLERENE CIRCUMSTELLAR ENVIRONMENT?". United States. doi:10.1088/2041-8205/759/1/L21.
@article{osti_22078461,
title = {HIGH-RESOLUTION OPTICAL SPECTROSCOPY OF DY Cen: DIFFUSE INTERSTELLAR BANDS IN A PROTO-FULLERENE CIRCUMSTELLAR ENVIRONMENT?},
author = {Garcia-Hernandez, D. A. and Rao, N. Kameswara and Lambert, David L., E-mail: agarcia@iac.es, E-mail: nkrao@iiap.res.in, E-mail: dll@astro.as.utexas.edu},
abstractNote = {We search high-resolution and high-quality VLT/UVES optical spectra of the hot R Coronae Borealis star DY Cen for electronic transitions of the C{sub 60} molecule and diffuse interstellar bands (DIBs). We report the non-detection of the strongest C{sub 60} electronic transitions (e.g., those at {approx}3760, 3980, and 4024 A). The absence of C{sub 60} absorption bands may support recent laboratory results, which show that the {approx}7.0, 8.5, 17.4, and 18.8 {mu}m emission features seen in DY Cen-and other similar objects with polycyclic-aromatic-hydrocarbon-like dominated IR spectra-are attributable to proto-fullerenes or fullerene precursors rather than to C{sub 60}. DIBs toward DY Cen are normal for its reddening; the only exception is the DIB at 6284 A (possibly also the 7223 A DIB) which is found to be unusually strong. We also report the detection of a new broad (FWHM {approx} 2 A) and unidentified feature centered at {approx}4000 A. We suggest that this new band may be related to the circumstellar proto-fullerenes seen at infrared wavelengths.},
doi = {10.1088/2041-8205/759/1/L21},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 1,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}