J/A+A/472/101 Chemical evolution of SMC planetary nebulae (Idiart+, 2007)
Chemical evolution of the Small Magellanic Cloud based on planetary nebulae.
Idiart T.P., Maciel W.J., Costa R.D.D.
<Astron. Astrophys. 472, 101 (2007)>
=2007A&A...472..101I 2007A&A...472..101I
ADC_Keywords: Magellanic Clouds ; Planetary nebulae ; Spectroscopy
Keywords: galaxies: abundances - galaxies: Magellanic Clouds -
ISM: planetary nebulae - galaxy: evolution
Abstract:
We investigate the chemical evolution of the Small Magellanic Cloud
(SMC) based on abundance data of planetary nebulae (PNe). The main
goal is to investigate the time evolution of the oxygen abundance in
this galaxy by deriving an age-metallicity relation. Such a relation
is of fundamental importance as an observational constraint for
chemical evolution models of the SMC.
We have used high quality PNe data to derive the properties of the
progenitor stars, so that the stellar ages could be estimated. We
collected a large number of measured spectral fluxes for each nebula
and derived accurate physical parameters and nebular abundances. New
spectral data for a sample of SMC PNe obtained between 1999 and 2002
are also presented. These data are used with data available in the
literature to improve the accuracy of the fluxes for each spectral
line.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
object.dat 45 46 List of nebulae with position
table2.dat 35 792 New measured fluxes with errors (relative to Hbeta)
table3.dat 39 966 Average fluxes with errors (relative to Hbeta)
table7.dat 149 46 Ionic abundances and uncertainties
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Byte-by-byte Description of file: object.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Nebula name
9- 10 I2 h RAh Right ascension (J2000)
12- 13 I2 min RAm Right ascension (J2000)
15- 19 F5.2 s RAs Right ascension (J2000)
21 A1 --- DE- Declination sign (J2000)
22- 23 I2 deg DEd Declination (J2000)
25- 26 I2 arcmin DEm Declination (J2000)
28- 31 F4.1 arcsec DEs Declination (J2000)
34- 45 A12 --- SName Simbad name
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Nebula name
9- 21 A13 --- Ion/line Ion/Line wavelength (Angstroms)
23- 28 F6.1 --- Flux ? Measured flux (relative to Hbeta)
29- 33 F5.1 --- e_Flux ? Uncertainty of the flux
35 I1 --- o_Flux ? Number of measurements
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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- 7 A7 --- Name Nebula name
9- 23 A15 --- Ion/line Ion/Line wavelength (Angstroms)
24- 30 F7.1 --- Flux ? Average flux (relative to Hbeta)
32- 37 F6.1 --- e_Flux ? Uncertainty of the flux
39 I1 --- o_Flux ? Number of measurements
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Nebula name
10- 15 E6.2 --- A3727 ? Ionic abundances OII 3727
19- 24 E6.2 --- A3869 ? Ionic abundances NeIII 3869/3968
28- 33 E6.2 --- A4959 ? Ionic abundances OIII 4959/5007
37- 42 E6.2 --- A6312 ? Ionic abundances SIII 6312
46- 51 E6.2 --- A6584 ? Ionic abundances NII 6584
55- 60 E6.2 --- A6717 ? Ionic abundances SII 6717/6731
64- 69 E6.2 --- A7135 ? Ionic abundances ArIII 7135
73- 78 E6.2 --- A7320 ? Ionic abundances OII 7320/7330
79- 80 A2 --- n_A3727 [*] Origin of dispersion (1)
81- 86 E6.2 --- e_A3727 ? Uncertainty in the ionic abundances OII 3727
87 A1 --- u_A3727 Uncertainty flag on A3727 (2)
89 A1 --- n_A3869 [*] Origin of dispersion (1)
90- 95 E6.2 --- e_A3869 ? Uncertainty in the ionic abundances
NeIII 3869/3968
96 A1 --- u_A3869 Uncertainty flag on A3869 (2)
98-103 E6.2 --- e_A4959 ? Uncertainty in the ionic abundances
OIII 4959/5007
104 A1 --- u_A4959 Uncertainty flag on A4959 (2)
106 A1 --- n_A6312 [*] Origin of dispersion (1)
107-112 E6.2 --- e_A6312 ? Uncertainty in the ionic abundances SIII 6312
113 A1 --- u_A6312 Uncertainty flag on A6312 (2)
115 A1 --- n_A6584 [*] Origin of dispersion (1)
116-121 E6.2 --- e_A6584 ? Uncertainty in the ionic abundances NII 6584
122 A1 --- u_A6584 Uncertainty flag on A6584 (2)
124 A1 --- n_A6717 [*] Origin of dispersion (1)
125-131 E7.2 --- e_A6717 ? Uncertainty in the ionic abundances
SII 6717/6731
132 A1 --- u_A6717 Uncertainty flag on A6717 (2)
133 A1 --- n_A7135 [*] Origin of dispersion (1)
134-139 E6.2 --- e_A7135 ? Uncertainty in the ionic abundances ArIII 7135
140 A1 --- u_A7135 Uncertainty flag on A7135 (2)
142 A1 --- n_A7320 [*] Origin of dispersion (1)
143-148 E6.2 --- e_A7320 ? Uncertainty in the ionic abundances
OII 7320/7330
149 A1 --- u_A7320 Uncertainty flag on A7320 (2)
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Note (1): Origin of dispersion:
* = the dispersion is due to different measurements of Te and/or Ne
** = the dispersion is due to different measurements of ionic line only
Note (2): A (:) means that only one measurement of Te, Ne and ionic line are
available.
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Acknowledgements:
Walter Maciel, maciel(at)astro.iag.usp.br
History:
* 10-Jul-2007: Original version
* 13-Nov-2007: Simbad Name corrected for the two last PNe
(End) Patricia Vannier [CDS] 10-Jul-2007