2000ApJ...541..688P

Query : 2000ApJ...541..688P

2000ApJ...541..688P - Astrophys. J., 541, 688-700 (2000/October-1)

The chemical composition of the Small Magellanic Cloud H II region NGC 346 and the primordial helium abundance.

PEIMBERT M., PEIMBERT A. and RUIZ M.T.

Abstract (from CDS):

Spectrophotometry in the λλ3400-7400 range is presented for 13 areas of the brightest H II region in the SMC: NGC 346. The observations were obtained at CTIO with the 4 m telescope. Based on these observations, its chemical composition is derived. The helium and oxygen abundances by mass are given by Y(SMC)=0.2405±0.0018 and O(SMC)=0.00171±0.00025. From models and observations of irregular and blue compact galaxies it is found that ΔY/ΔO=3.5±0.9 and, consequently, that the primordial helium abundance by mass is given by Yp=0.2345±0.0026 (1 σ). This result is compared with values derived from big bang nucleosynthesis and with other determinations of Yp.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Abundances - Galaxies: Individual: Name: Small Magellanic Cloud - Galaxies: ISM - ISM: H II Regions - ISM: Abundances - Galaxies: Magellanic Clouds

Simbad objects: 13

goto Full paper

goto View the references in ADS

Number of rows : 13
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11149 1
2 Cl* NGC 346 ELS 7 * 00 58 57.3961905528 -72 10 33.660822720 12.68 13.82 14.13   14.28 O4V((f+)) 52 0
3 Cl* NGC 346 W 3 * 00 59 00.7591806336 -72 10 28.171806492 11.46 12.61 12.80   13.63 O2III(f) 62 0
4 Cl* NGC 346 MPG 396 * 00 59 02.92 -72 10 34.8   14.17 14.39     O7V 8 0
5 NGC 346 Cl* 00 59 04.4000 -72 10 39.000           ~ 490 0
6 OGLE SMC-ECL- 3932 EB* 00 59 05.984 -72 10 34.05   13.57 13.800   14.025 O8.5III 11 0
7 Cl* NGC 346 MPG 476 * 00 59 06.193 -72 10 33.56     14.562   14.757 ~ 5 0
8 SBSG 0335-052 bCG 03 37 44.06 -05 02 40.2     16.65     ~ 472 1
9 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17434 0
10 NGC 2363 AG? 07 28 29.59 +69 11 34.3   15.5       ~ 257 1
11 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 564 3
12 Mrk 116 PaG 09 34 02.1 +55 14 25           ~ 1106 1
13 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1615 0

To bookmark this query, right click on this link: simbad:objects in 2000ApJ...541..688P and select 'bookmark this link' or equivalent in the popup menu