J/A+A/521/A3 Abundances in HII regions and PNe of M81 (Stanghellini+, 2010)
The population of planetary nebulae and HII regions in M81.
A study of radial metallicity gradients and chemical evolution.
Stanghellini L., Magrini L., Villaver E., Galli D.
<Astron. Astrophys. 521, A3 (2010)>
=2010A&A...521A...3S 2010A&A...521A...3S
ADC_Keywords: Galaxies, nearby ; H II regions ; Planetary nebulae ; Abundances
Keywords: ISM: abundances - H II regions - planetary nebulae: general -
galaxies: abundances - galaxies: evolution -
galaxies: clusters: individual: M81
Abstract:
M81 is an ideal laboratory to investigate the galactic chemical and
dynamical evolution through the study of its young and old stellar
populations.
We analyze the chemical abundances of planetary nebulae and HII
regions in the M81 disk for insight on galactic evolution, and compare
it with that of other galaxies, including the Milky Way.
Description:
We acquired Hectospec/MMT spectra of 39 PNe and 20 HII regions, with
33 spectra viable for temperature and abundance analysis. Our PN
observations represent the first PN spectra in M81 ever published,
while several HII region spectra have been published before, although
without a direct electron temperature determination. We determine
elemental abundances of helium, nitrogen, oxygen, neon, sulfur, and
argon in PNe and HII regions, and determine their averages and radial
gradients.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 48 63 Observing log
table2.dat 42 1634 Observed fluxes and line intensities
table3.dat 30 994 Plasma analysis and abundances
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See also:
J/A+A/379/90 : Candidate Planetary Nebulae in M81 (Magrini+, 2001)
J/AJ/126/1286 : Hα+[NII] observations of M81 HII regions (Lin+, 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Target name (1)
9 I1 h RAh Right ascension (J2000)
11- 12 I2 min RAm Right ascension (J2000)
14- 18 F5.2 s RAs Right ascension (J2000)
20 A1 --- DE- Declination sign (J2000)
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 30 F4.1 arcsec DEs Declination (J2000)
31 A1 --- n_Name [*] Note on position (2)
32- 36 F5.2 mag m5007 ? Visual magnitude at λ=5007Å
38- 42 F5.3 [-] cbeta ? Hbeta logarithmic extinction, for target
with observed fluxes in table2
44- 48 F5.3 [-] e_cbeta ? rms uncertainty on cbeta
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Note (1): Nomenclature note:
PNNNNm = <[MPC2001] NNN> in Simbad
HIINNN = in Simbad
PN4 and PN5 = identified PNe with unpublished positions (Magrini,
private communication)
Note (2): The position of HII21 was erroneous in the paper, corrected with
the SIMBAD coordinates by CDS.
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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 Target name
9- 18 A10 --- Ion Emitting ion
20- 23 I4 0.1nm lambda Wavelength
25- 30 F6.1 --- Flux ?=0 Flux (scaled to F_Hbeta=100)
32- 35 F4.1 --- e_Flux ?=0 rms uncertainty on Flux
(scaled to F_Hbeta=100)
37- 42 F6.1 --- Int ?=0 Intensity (scaled to I_beta=100)
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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 Target name
8- 20 A13 --- Param Parameter name
22- 30 E9.4 --- Value Value
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Acknowledgements:
Letizia Stanghellini, letizia(at)noao.edu
(End) Patricia Vannier [CDS] 26-Jul-2010