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J/A+A/441/981       HII regions in 5 spiral galaxies         (Bresolin+, 2005)

A VLT study of metal-rich extragalactic H II regions. I. Observations and empirical abundances. Bresolin F., Schaerer D., Gonzalez Delgado R.M., Stasinska G. <Astron. Astrophys. 441, 981 (2005)> =2005A&A...441..981B
ADC_Keywords: Abundances ; Galaxies, optical ; H II regions ; Spectroscopy Keywords: galaxies: abundances - galaxies: ISM - galaxies: stellar content Abstract: We have obtained spectroscopic observations from 3600Å to 9200Å with FORS at the Very Large Telescope for approximately 70 HII regions located in the spiral galaxies NGC 1232, NGC 1365, NGC 2903, NGC 2997 and NGC 5236. These data are part of a project aiming at measuring the chemical abundances and characterizing the massive stellar content of metal-rich extragalactic HII regions. In this paper we describe our dataset, and present emission line fluxes for the whole sample. In 32 HII regions we measure at least one of the following auroral lines: [S II]4072, [N II]5755, [S III]6312 and [O II]7325. From these we derive electron temperatures, as well as oxygen, nitrogen and sulphur abundances, using classical empirical methods (both so-called "Te-based methods" and "strong line methods"). Under the assumption that the temperature gradient does not introduce severe biases, we find that the most metal-rich nebulae with detected auroral lines are found at 12+log(O/H)∼8.9, i.e. about 60% larger than the adopted solar value. However, classical abundance determinations in metal-rich HII regions may be severely biased and must be tested with realistic photoionization models. The spectroscopic observations presented in this paper will serve as a homogeneous and high-quality database for such purpose. Description: Tables 5-9 present the dereddened nebular emission line fluxes measured for H II regions in the galaxies NGC 1232, NGC 1365, NGC 2903, NGC 2997 and NGC 5236. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 03 09 45.2 -20 34 45 NGC 1232 = AGC 22364 03 33 36.3 -36 08 28 NGC 1365 = AGC 22699 09 32 09.7 +21 30 03 NGC 2903 = NGC 2905 09 45 38.7 -31 11 25 NGC 2997 = UGCA 181 13 37 00.8 -29 51 58 NGC 5236 = M 83 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file ngc1232.dat 223 13 Nebular emission line fluxes: NGC 1232 (table5) ngc1365.dat 223 15 Nebular emission line fluxes: NGC 1365 (table6) ngc2903.dat 223 9 Nebular emission line fluxes: NGC 2903 (table7) ngc2997.dat 223 14 Nebular emission line fluxes: NGC 2997 (table8) ngc5236.dat 223 18 Nebular emission line fluxes: NGC 5236 (table9)
Byte-by-byte Description of file: ngc*.dat
Bytes Format Units Label Explanations
2- 3 I2 --- HIIregion H II region number in the galaxy (1) 4- 9 F6.0 --- F3727 OII (3727AA) flux (2) (3) 10- 13 F4.0 --- e_F3727 Uncertainty in OII 14- 19 F6.1 --- F3869 NeIII (3869AA) flux (2) 20- 24 F5.1 --- e_F3869 Uncertainty in NeIII 25- 29 F5.0 --- F4101 Hdelta (4101AA) flux (2) 30- 33 F4.0 --- e_F4101 Uncertainty in Hdelta 34- 39 F6.2 --- F4072 SII (4072AA) flux (2) 40- 44 F5.2 --- e_F4072 Uncertainty in SII 45- 49 F5.0 --- F4340 Hgamma (4340AA) flux (2) 50- 53 F4.0 --- e_F4340 Uncertainty in Hgamma 54- 58 F5.1 --- F4471 HeI (4471AA) flux (2) 59- 63 F5.1 --- e_F4471 Uncertainty in HeI 64- 69 F6.0 --- F4959 OIII (4959AA) flux (2) 70- 73 F4.0 --- e_F4959 Uncertainty in OIII 74- 79 F6.0 --- F5007 OIII (5007AA) flux (2) 80- 83 F4.0 --- e_F5007 Uncertainty in OIII 84- 89 F6.2 --- F5200 NI (5200AA) flux (2) 90- 95 F6.2 --- e_F5200 Uncertainty in NI 96-100 F5.2 --- F5755 NII (5755AA) flux (2) 101-105 F5.2 --- e_F5755 Uncertainty in NII 106-110 F5.1 --- F5876 HeI (5876AA) flux (2) 111-115 F5.1 --- e_F5876 Uncertainty in HeI 116-120 F5.1 --- F6300 OI (6300AA) flux (2) 121-125 F5.1 --- e_F6300 Uncertainty in OI 126-131 F6.2 --- F6312 SIII (6312AA) flux (2) 132-137 F6.2 --- e_F6312 Uncertainty in SIII 138-142 F5.0 --- F6548 NII (6548AA) flux (2) 143-146 F4.0 --- e_F6548 Uncertainty in NII 147-151 F5.0 --- F6563 Halpha (6563AA) flux (2) 152-156 F5.0 --- e_F6563 Uncertainty in Halpha 157-162 F6.0 --- F6583 NII (6583AA) flux (2) 163-166 F4.0 --- e_F6583 Uncertainty in NII 167-171 F5.1 --- F6678 HeI (6678AA) flux (2) 172-176 F5.1 --- e_F6678 Uncertainty in HeI 177-181 F5.0 --- F6716 SII (6716AA) flux (2) 182-185 F4.0 --- e_F6716 Uncertainty in SII 186-190 F5.0 --- F6731 SII (6731AA) flux (2) 191-194 F4.0 --- e_F6731 Uncertainty in SII 195-199 F5.1 --- F7135 ArIII (7135AA) flux (2) 200-204 F5.1 --- e_F7135 Uncertainty in ArIII 205-209 F5.1 --- F7325 OII (7325AA) flux (2) 210-214 F5.1 --- e_F7325 Uncertainty in OII 215-219 F5.0 --- F9069 SIII (9069AA) flux (2) 220-223 F4.0 --- e_F9069 Uncertainty in SIII
Note (1): Nomenclature: NGC 5236 NN = [BK2002] M 83 NN, Bresolin & Kennicutt, 2002ApJ...572..838B in Simbad Note (2): Line fluxes given in units of Hbeta = 100. Note (3): lower limit for object 05 in NGC 5236
Acknowledgements: Fabio Bresolin, bresolin(at)ifa.hawaii.edu
(End) Fabio Bresolin [IfA, Hawaii], Patricia Vannier [CDS] 23-Aug-2005
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