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J/A+A/512/A63       Abundances of M33 HII regions            (Magrini+, 2010)

Metal production in M33: space and time variations. Magrini L, Stanghellini L., Corbelli E., Galli D., Villaver E. <Astron. Astrophys. 512, A63 (2010)> =2010A&A...512A..63M
ADC_Keywords: Galaxies, nearby ; H II regions ; Abundances Keywords: galaxies: abundances - galaxies: evolution - galaxies: individual: M33 Abstract: We analyze the spatial distribution of metals in M33 using a new sample and literature data of HII regions, constraining a model of galactic chemical evolution with HII region and planetary nebula (PN) abundances. We consider chemical abundances of a new sample of HII regions complemented with previous literature data-sets. Supported by a uniform sample of nebular spectroscopic observations, we conclude that: i) the metallicity distribution in M33 is very complex, showing a central depression in metallicity probably due to observational bias; ii) the metallicity gradient in the disk of M33 has a slope of -0.037±0.009dex/kpc in the whole radial range up to ∼8kpc, and -0.044±0.009dex/kpc excluding the central kpc; iii) there is a small evolution of the slope with time from the epoch of PN progenitor formation to the present-time. Description: Emission line fluxes, observed and dereddened of 33 HII regions are presented. Physical and chemical properties, such as electron temperatures and density, ionic and total chemical abundances of He, O, N, Ne, Ar, S, are derived. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 56 33 MMT observations of HII regions with chemical abundance determination table2.dat 57 1254 Emission line fluxes observed and dereddened, with their errors, of 33 HII regions table3.dat 183 33 Physical and chemical properties of 33 HII regions
See also: J/AJ/110/2739 : H-alpha emitting regions in M33 (Calzetti+ 1995) J/ApJ/505/793 : New WR star in M33 (Massey+, 1998) J/ApJS/120/247 : Supernova remnants in M33 (Gordon+, 1999) J/PASP/111/685 : HII regions of M33. II. (Hodge+, 1999) J/A+A/367/498 : Candidate Planetary Nebulae in M 33 (Magrini+, 2001) J/ApJ/614/167 : Planetary nebulae in M33 (Ciardullo+, 2004) J/A+A/444/831 : New star clusters in M33 (Bedin+, 2005) J/A+A/448/1247 : XMM-Newton survey of M33 (Misanovic+, 2006) J/A+A/476/1161 : Spitzer photometry of M33 (Verley+, 2007) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1 A1 --- n_Seq [nc] new or control sample 3- 4 I2 --- Seq Sequential number 6- 17 A12 --- Name HII region name 20- 21 I2 h RAh Right ascension (J2000) 23- 24 I2 min RAm Right ascension (J2000) 26- 29 F4.1 s RAs Right ascension (J2000) 31 A1 --- DE- Declination sign (J2000) 32- 33 I2 deg DEd Declination (J2000) 35- 36 I2 arcmin DEm Declination (J2000) 38- 42 F5.2 arcsec DEs Declination (J2000) 44- 56 A13 --- SName Simbad name
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name HII region name 14- 18 F5.3 [---] c(Hb) Nebular extinction coefficient c(Hβ) 20- 24 F5.3 [---] e_c(Hb) Error on c(Hb) 26- 35 A10 --- Ion Ion name 38- 41 I4 0.1nm lambda Rest frame wavelength 43- 47 F5.1 --- Flux ? Observed flux (Hβ=100) 49- 51 F3.1 --- e_Flux ? Error on observed flux 53- 57 F5.1 --- Int ? Intensity (dereddened flux, Hβ=100)
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name HII region name 13- 17 I5 K T.OIII ? Electron temperature [OIII] 19- 23 I5 K T.SIII ? Electron temperature [SIII] 26- 30 I5 K T.NII ? Electron temperature [NII] 32- 34 I3 cm-3 N.SII ? Electron density [SII] 36- 40 F5.3 --- HeI/H ? Helium I abundance 42- 49 E8.2 --- OI/H ? OI ionic abundance 51- 58 E8.2 --- OII/H ? OII ionic abundance 60- 67 E8.2 --- OIII/H ? OIII ionic abundance 69- 76 E8.2 --- O/H ? O total abundance 78- 85 E8.2 --- NII/H ? NII ionic abundance 87- 92 F6.3 --- ICF(N) ? Ionization correction factor N 94-101 E8.2 --- N/H ? N total abundance 103-110 E8.2 --- NeIII/H ? NeIII ionic abundance 112-117 F6.3 --- ICF(Ne) ? Ionization correction factor Ne 119-126 E8.2 --- Ne/H ? Ne total abundance 128-135 E8.2 --- ArIII/H ? ArIII ionic abundance 137-141 F5.3 --- ICF(Ar) ? Ionization correction factor Ar 143-150 E8.2 --- Ar/H ? Ar total abundance 152-159 E8.2 --- SII/H ? SII ionic abundance 161-168 E8.2 --- SIII/H ? SIII ionic abundance 170-174 F5.3 --- ICF(S) ? Ionization correction factor S 176-183 E8.2 --- S/H ? S total abundance
Acknowledgements: Laura Magrini, laura(at)arcetri.astro.it
(End) Patricia Vannier [CDS] 29-Dec-2009
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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