2013A&A...550L...6G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST07:02:04

2013A&A...550L...6G - Astronomy and Astrophysics, volume 550, L6-6 (2013/2-1)

Diffuse interstellar bands in fullerene planetary nebulae: the fullerenes - diffuse interstellar bands connection.

GARCIA-HERNANDEZ D.A. and DIAZ-LUIS J.J.

Abstract (from CDS):

We present high-resolution (R ∼15000) VLT/UVES optical spectra of two planetary nebulae (PNe; Tc 1 and M 1-20) where C60 (and C70) fullerenes have already been found. These spectra are of high quality (S/N>300) for PN Tc 1, which permits us to search for the expected electronic transitions of neutral C60 and diffuse interstellar bands (DIBs). Surprisingly, we report the non-detection of the most intense optical bands of C60 in Tc 1, although this could be explained by the low C60 column density estimated from the C60 infrared bands if the C60 emission peaks far away from the central star. The strongest and most common DIBs in both fullerene PNe are normal for their reddening. Interestingly, the very broad 4428Å DIB and the weaker 6309Å DIB are found to be unusually intense in Tc 1. We also report the detection of a new broad (FWHM ∼5Å) unidentified band at ∼6525Å. We propose that the 4428Å DIB (probably also the 6309Å DIB and the new 6525Å band) may be related to the presence of larger fullerenes (e.g., C80, C240, C320, and C540) and buckyonions (multishell fullerenes such as C60@C240 and C60@C240@C540) in the circumstellar envelope of Tc 1.

Abstract Copyright:

Journal keyword(s): astrochemistry - line: identification - circumstellar matter - ISM: molecules - planetary nebulae: individual: Tc 1 - planetary nebulae: individual: M 1-20

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* DY Cen RC* 13 25 34.0847442636 -54 14 43.129740133     12.00     C-Hd/B5-6Ie 86 0
2 * k Sco s*b 17 04 49.3525354906 -34 07 22.541655837 4.44 5.13 4.87 4.59 4.42 B2Iab 142 0
3 PN M 1-20 PN 17 28 57.612 -19 15 53.94           ~ 120 0
4 PN Tc 1 PN 17 45 35.2877697798 -46 05 23.713203258   11.30 11.49     PCyg 240 0
5 HD 164402 SB* 18 01 54.3808744917 -22 46 49.057918136 4.88 5.77 5.77 5.74 5.69 B0Iab/b 160 1
6 HD 204827 SB* 21 28 57.7601719555 +58 44 23.223287944 8.63 8.74 7.94 7.25 6.76 O9.5IV 297 0
7 HD 204287 PM* 21 29 14.4761634532 -50 19 00.640238670   7.98 7.32     G3V 45 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-07:02:04

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