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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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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
Note (1): Nomenclature note: PNNNNm = <[MPC2001] NNN> in Simbad HIINNN = <PSK NNN> 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.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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)
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Name Target name 8- 20 A13 --- Param Parameter name 22- 30 E9.4 --- Value Value
Acknowledgements: Letizia Stanghellini, letizia(at)noao.edu
(End) Patricia Vannier [CDS] 26-Jul-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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