J/ApJ/753/172 Dust classification in Galactic PNe (Stanghellini+, 2012)
The nature of dust in compact Galactic planetary nebulae from Spitzer spectra.
Stanghellini L., Garcia-Hernandez D.A., Garcia-Lario P., Davies J.E.,
Shaw R.A., Villaver E., Manchado A., Perea-Calderon J.V.
<Astrophys. J., 753, 172 (2012)>
=2012ApJ...753..172S 2012ApJ...753..172S
ADC_Keywords: Planetary nebulae ; Spectra, infrared
Keywords: planetary nebulae: general
Abstract:
We present the Spitzer/Infrared Spectrograph (IRS) spectra of 157
compact Galactic planetary nebulae (PNe). These young PNe provide
insight on the effects of dust in early post-asymptotic giant branch
evolution, before much of the dust is altered or destroyed by the
hardening stellar radiation field. Most of the selected targets have
PN-type IRS spectra, while a few turned out to be misclassified stars.
We inspected the group properties of the PN spectra and classified
them based on the different dust classes (featureless or F,
carbon-rich dust or CRD, oxygen-rich dust or ORD, mixed-chemistry dust
or MCD) and subclasses (aromatic and aliphatic, and crystalline and
amorphous). All PNe are characterized by dust continuum and more than
80% of the sample shows solid-state features above the continuum, in
contrast with the Magellanic Cloud sample where only ∼40% of the
entire sample displays solid-state features; this is an indication of
the strong link between dust properties and metallicity.
Description:
In this paper, we present the 5-40um IRS spectra from Spitzer program
GO 50261 for a target selection which covers a homogenous and as much
as possible complete set of compact Galactic PNe. Observed targets are
listed in table 1 along with the IRS campaign number associated.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 63 158 Observing log
table3.dat 69 157 Dust classification and dust parameters
table4.dat 52 157 Other PN parameters
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See also:
II/298 : AKARI/FIS All-Sky Survey Point Source Catalogues (ISAS/JAXA, 2010)
V/127 : MASH Catalogues of Planetary Nebulae (Parker+ 2006-2008)
IV/24 : Catalogue of Galactic Planetary Nebulae (Kohoutek, 2001)
V/84 : Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (Acker+, 1992)
J/A+A/552/A74 : NIR phot. of Galactic PNe with VVV Survey (Weidmann+, 2013)
J/A+A/526/A6 : Central stars of galactic planetary nebulae (Weidmann+, 2011)
J/ApJ/714/1096 : Galactic planetary nebulae (Stanghellini+, 2010)
J/ApJ/689/194 : Distances of galactic planetary nebulae (Stanghellini+, 2008)
J/ApJ/671/1669 : Magellanic cloud PNe in the IR (Stanghellini+, 2007)
J/MNRAS/357/732 : 2MASS phot. of galactic planetary nebulae (Larios+, 2005)
J/A+A/408/1029 : Coordinates of Galactic planetary nebulae (Kerber+, 2003)
J/AJ/115/1989 : Distances of galactic planetary nebulae (Tajitsu+, 1998)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [PN G]
5- 14 A10 --- PNG Source name (LLL.l+BB.b)
17- 27 A11 --- Alias Source alias
29- 30 I2 h RAh Hour of Right Ascension (J2000)
32- 33 I2 min RAm Minute of Right Ascension (J2000)
35- 38 F4.1 s RAs Second of Right Ascension (J2000)
40 A1 --- DE- Sign of the Declination (J2000)
41- 42 I2 deg DEd Degree of Declination (J2000)
44- 45 I2 arcmin DEm Arcminute of Declination (J2000)
47- 48 I2 arcsec DEs Arcsecond of Declination (J2000)
50- 55 I6 --- IRS [9400/12000] IRS campaign identifier
57 I1 --- Mode [0/3]? Observing mode (1)
59- 63 F5.2 s Exp [12/45] Total exposure time
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Note (1): Observing mode as follows:
0 = combination of SL (short-low, 5-14µm) and
LL (long-low, 14-40µm) modules;
1 = combination of the SL, SH (short-high, 10-20µm) and
LH (long-high, 20-40µm).
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [PN G]
5- 14 A10 --- PNG Source name (LLL.l+BB.b)
16- 18 A3 --- Class Dust classification (1)
20 A1 --- Sub Subclassification (2)
22 A1 --- u_Sub [b] Indicates uncertainty in Class or Sub
24 A1 --- Fit Black body fit type (3)
26- 29 F4.2 --- alpha [0/7.5]? Emissivity index
33- 37 F5.2 --- Flux [0.4/36]? Satellite flux density (Akari 65um
or IRAS 60um) (4)
39- 42 F4.2 --- e_Flux [0.01/3.5]? Uncertainty in FLux
44 A1 --- r_Flux [de] Origin of Flux (5)
46- 51 F6.2 K Tdust [57/225]? Dust temperature
53- 57 F5.2 K e_Tdust [0.3/15]? Uncertainty in Tdust
59- 63 F5.3 [Lsun] logLIR [1.6/3.8]? Log of IR luminosity
65- 69 F5.3 [Lsun] IRE [1.6/3.8]? Log infrared excess luminosity
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Note (1): Classification as follows:
MCD = mixed-chemistry dust;
CRD = carbon-rich dust;
ORD = oxygen-rich dust;
NA = Not available (for 7 sources);
F = featureless.
Note (2): Subclassification as follows:
0 = featureless;
1 = aromatic;
2 = aliphatic;
3 = aromatic/aliphatic;
4 = crystalline;
5 = amorphous;
6 = crystalline/amorphous;
7 = MCD (mixed-chemistry dust);
8 = other.
Note (3): Black body fit type as follows:
A = good fit, excellent Flux (60 or 65µm) constraints;
B = good fit, no constraints available;
C = good fit, poor constraints (not used in the plots);
N = continuum fit does not converge.
Note (4): We used the Akari 65µm flux (Yamamura et al., 2010, Cat.
II/298) when available, otherwise the 60µm IRAS flux (given in
Acker et al. 1992, Cat. V/84). Errors are given when available from
the Akari data archives; flux errors are not available for IRAS, only
flux quality, where a low quality indicates an upper limit to the
60µm flux, which is still valid, in our case, to constraint the
continuum fit.
Note (5): Flag as follows:
d = Flux is 65µm flux from Akari.
e = Flux is 60µm flux from IRAS.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [PN G]
5- 14 A10 --- PNG Source name (LLL.l+BB.b)
16- 21 F6.3 kpc RGal [0.2/22.5]? Radial distance from Galactic
center (6)
23- 27 F5.2 [cm] logR [16.3/17.8]? Log planetary nebula size (6)
29- 33 F5.3 [cm-3] logNe [2/5]? Log electron density
35- 38 F4.1 --- I4686 [0.3/92]? Intensity at 4686Å, normalized
to Hβ=100 (6)
40- 45 F6.3 --- Ratio [-2/3]? The [NeIII](15.56um)/[NeII](12.81um)
ratio
47- 52 F6.3 --- EC [0.07/12.2]? Excitation constant (6)
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Note (6): measure of the hardness of the ionizing stellar flux, see
Stanghellini & Haywood (2010, Cat. J/ApJ/714/1096).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 25-Feb-2014