J/A+A/655/A46 Simulated IR spectra of PN Hubble 12 (Hsia+, 2021)
Morphological study of the nested planetary nebula Hubble 12.
Hsia C.-H., Zhang Y., Sadjadi S., Chau W., Han H.-J., Chen J.-F.
<Astron. Astrophys. 655, A46 (2021)>
=2021A&A...655A..46H 2021A&A...655A..46H (SIMBAD/NED BibCode)
ADC_Keywords: Planetary nebulae; Spectra, infrared ; Models
Keywords: infrared: ISM - stars: AGB and post AGB -
planetary nebulae: individual: Hb 12
Abstract:
We present a visible-infrared imaging study of young planetary nebula
(PN) Hubble 12 (Hb 12; PN G111.8-02.8) obtained with Hubble Space
Telescope (HST) archival data and our own Canada-France-Hawaii
Telescope (CFHT) measurements. Deep HST and CFHT observations of this
nebula reveal three pairs of bipolar structures and an arc-shaped
filament near the western waist of Hb 12. The existence of nested
bipolar lobes together with the presence of H2 knots suggests that
these structures originated from several mass-ejection events during
the pre-PN phase. To understand the intrinsic structures of Hb 12, a
three-dimensional model enabling the visualisation of this PN at
various orientations was constructed. The modelling results show that
Hb 12 may resemble other nested hourglass nebulae, such as Hen 2-320
and M 2-9, suggesting that this type of PN may be common and the
morphologies of PNs are not so diverse as is shown by their visual
appearances. The infrared spectra show that this PN has a mixed
chemistry. We discuss the possible material that may cause the
unidentified infrared emissions. The analyses of the infrared spectra
and the spectral energy distribution suggest the existence of a cool
companion in the nucleus of this object.
Description:
Theoretically simulated infrared spectroscopic data of two molecular
structures with C15H16 formula (MAON-type and PAH aliphatic side
groups) at T=500K. A quantum chemical model of B3LYP/PC1 is applied
to calculate the vibrational normal modes. The main purpose is to take
these molecules as examples to test whether the observed UIE features
seen in Hb 12 are reproduced by both models. These spectra covered the
wavelength range from 1-15um.
The NIR observations were taken using the Wide-field InfraRed
Camera (WIRCam) on the CFHT under RUNID 12AS98 on 2012 August 4.
Objects:
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RA (2000) DE Designation(s)
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23 26 14.82 +58 10 54.5 Hb 12 = PN G111.8-02.8
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
listsp.dat 56 2 Simulated spectra of possible candidate
sp/* . 2 Individual simulated spectra
listimg.dat 83 2 List of fits images
fits/* . 2 Individual fits images
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Byte-by-byte Description of file: listsp.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name PN name
16- 17 I2 h RAh Simbad Hour of Right Ascension (J2000.0)
19- 20 I2 min RAm Simbad Minute of Right Ascension (J2000.0)
22- 26 F5.2 s RAs Simbad Second of Right Ascension (J2000.0)
28 A1 --- DE- Simbad Sign of the Declination (J2000.0)
29- 30 I2 deg DEd Simbad Degree of Declination (J2000.0)
32- 33 I2 arcmin DEm Simbad Arcminute of Declination (J2000.0)
35- 39 F5.2 arcsec DEs Simbad Arcsecond of Declination (J2000.0)
40 A1 --- MClass Classical molecular structures (1)
42- 56 A15 --- FileName Name of the spectral file in subdirectory sp
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Note (1): Classical molecular structure categories as follows:
M = MAON
P = PAH
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Byte-by-byte Description of file (#): sp/*
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Bytes Format Units Label Explanations
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1- 6 F6.3 um lambda [1/15] Wavelength
9- 16 E8.3 --- Flux Flux (normalized intensity)
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Byte-by-byte Description of file: listimg.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 30 I3 Kibyte size Size of FITS file
32- 47 A16 --- FileName Name of FITS file, in subdirectory fits
49- 83 A35 --- Title Title of the FITS file
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Acknowledgements:
Chih-Hao Hsia, chhsia(at)must.edu.mo
(End) Patricia Vannier [CDS] 09-Sep-2021