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 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