2005A&A...443..115M


Query : 2005A&A...443..115M

2005A&A...443..115M - Astronomy and Astrophysics, volume 443, 115-132 (2005/11-3)

The chemistry of planetary nebulae and HII regions in the dwarf galaxies Sextans A and B from deep VLT spectra.

MAGRINI L., LEISY P., CORRADI R.L.M., PERINOTTO M., MAMPASO A. and VILCHEZ J.M.

Abstract (from CDS):

Spectroscopic observations obtained with the VLT of one planetary nebula (PN) in Sextan A and of five PNe in Sextan B and of several HII regions in these two dwarf irregular galaxies are presented. The extended spectral coverage, from 320.0 to 1000.0nm, and the large telescope aperture allowed us to detect a number of emission lines, covering more than one ionization stage for several elements (He, O, S, Ar). The electron temperature diagnostic [OIII] line at 436.3nm was measured in all six PNe and in several HII regions allowing for an accurate determination of the ionic and total chemical abundances by means of the Ionization Correction Factors method. For the time being, these PNe are the farthest ones where such a direct measurement of the electron temperature is obtained. In addition, all PNe and HII regions were also modelled using the photoionization code CLOUDY (Ferland et al., 1998PASP..110..761F). The physico-chemical properties of PNe and HII regions are presented and discussed. A small dispersion in the oxygen abundance of HII regions was found in both galaxies: 12+log(O/H)=7.6±0.2 in Sextan A, and 7.8±0.2 in Sextan B. For the five PNe of Sextan A, we find that 12+log(O/H)=8.0±0.3, with a mean abundance consistent with that of HII regions. The only PN known in Sextan A appears to have been produced by a quite massive progenitor, and has a significant nitrogen overabundance. In addition, its oxygen abundance is 0.4dex larger than the mean abundance of HII regions, possibly indicating an efficient third dredge-up for massive, low-metallicity PN progenitors. The metal enrichment of both galaxies is analyzed using these new data.

Abstract Copyright:

Journal keyword(s): ISM: abundances - ISM: planetary nebulae: individual: Sextans A, Sextans B - ISM: HII regions - galaxies: individual: Sextans A Sextans B - galaxies: Local Group - galaxies: abundances

CDS comments: In Table 1 object HII H is NAME SEXTANS B HII H in Simbad.

Simbad objects: 33

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Number of rows : 33
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12107 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10538 1
3 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5610 1
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6564 1
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16525 1
6 [MCW2002] SexB PN1 PN 09 59 53.06 +05 18 52.1           ~ 3 0
7 [MCW2002] SexB PN2 PN 09 59 56.50 +05 19 29.5           ~ 4 0
8 [MCW2002] SexB PN3 PN 09 59 56.64 +05 19 52.6           ~ 3 0
9 [H74b] Sextans B 1 HII 09 59 58.2 +05 19 44           ~ 5 0
10 [SHK91] Sextans B 2 HII 09 59 58.2 +05 19 44           ~ 5 0
11 [SHK91] Sextans B 3 HII 09 59 59.2 +05 20 21           ~ 3 0
12 [MCW2002] SexB PN4 PN 10 00 00.19 +05 20 37.2           ~ 3 0
13 [H74b] Sextans B 2 HII 10 00 00.8 +05 20 30           ~ 5 0
14 NAME Sextans B H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 511 0
15 [SHK91] Sextans B 6 HII 10 00 01.1 +05 19 40           ~ 3 0
16 [SHK91] Sextans B 7 HII 10 00 01.2 +05 19 30           ~ 3 0
17 [H74b] Sextans B 3 HII 10 00 03.1 +05 20 27           ~ 5 0
18 NAME Sextans B HII H HII 10 00 05.3 +05 17 59           ~ 2 0
19 [MCW2002] SexB PN5 PN 10 00 10.48 +05 20 31.9           ~ 2 0
20 NGC 3109 G 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 742 2
21 NAME Antlia Dwarf Galaxy G 10 04 03.9 -27 20 01 16.73 15.69 15.17 15.00   ~ 205 1
22 [HKS94] 2 HII 10 10 53.7 -04 41 14           ~ 4 0
23 [HKS94] 3 HII 10 10 54.0 -04 41 59           ~ 3 0
24 [HKS94] 7 HII 10 10 55.5 -04 41 17           ~ 4 0
25 [HKS94] 9 HII 10 10 57.1 -04 40 30           ~ 3 0
26 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 706 2
27 [MCG2003] Sex A PN 1 PN? 10 11 01.58 -04 41 22.9           ~ 5 0
28 [HKS94] 14 HII 10 11 02.9 -04 42 36           ~ 2 0
29 [HKS94] 16 HII 10 11 05.5 -04 42 09           ~ 4 0
30 [HKS94] 19 HII 10 11 06.6 -04 42 15           ~ 5 0
31 [HKS94] 23 HII 10 11 09.0 -04 40 54           ~ 3 0
32 [HKS94] 24 HII 10 11 10.1 -04 41 33           ~ 4 0
33 NAME Local Group GrG ~ ~           ~ 7904 0

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2023.02.04-11:07:20

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