2006AJ....131..849P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST07:45:57

2006AJ....131..849P - Astron. J., 131, 849-858 (2006/February-0)

Massive stellar content of giant H II regions in M33 and M101.

PELLERIN A.

Abstract (from CDS):

Far-ultraviolet (900-1200 Å) spectral synthesis of nine giant extragalactic H II regions in M33 and M101 is performed to study their massive stellar content. Several parameters are quantified, predicted, and compared to the literature: age, stellar mass, initial mass function (IMF) slope, number of O-type and Wolf-Rayet stars, and Hα and 5500 Å continuum fluxes. The results of this particular technique are consistent with other methods and observations. This work shows that a total stellar mass of a few 103 M is needed to populate the IMF bins well enough at high masses to obtain accurate results from the spectral synthesis technique in the far-ultraviolet. A flat IMF slope seems to characterize better the stellar line profiles of these objects, which is likely the first sign of a small number statistics effect on the IMF. Finally, the H II region NGC 5461 is identified as a good candidate for hosting a second generation of stars, not yet seen at far-ultraviolet wavelengths.

Abstract Copyright:

Journal keyword(s): Galaxies: Individual: Messier Number: M33 - Galaxies: Individual: Messier Number: M101 - Galaxies: Stellar Content - Stars: Early-Type - Ultraviolet: Stars

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 BCLMP 281 HII 01 32 37.566 +30 40 08.76     12.2     ~ 6 1
2 NGC 588 HII 01 32 45.2 +30 38 54 14.59 14.40 14.44 14.89 15.16 ~ 116 1
3 VGHC 2-22 HII 01 33 12.188 +30 38 47.14           ~ 75 0
4 NGC 595 HII 01 33 33.53 +30 41 29.8           ~ 190 0
5 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5134 1
6 NGC 604 HII 01 34 32.1 +30 47 01           ~ 544 0
7 LHA 120-N 11 HII 04 56 51.4 -66 24 24           ~ 234 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1
9 HD 269927 ** 05 38 58.80 -69 29 23.0           B0I+O7If+WN9 27 0
10 NGC 5447 HII 14 02 28.0 +54 16 34           ~ 68 0
11 NGC 5458 HII 14 03 12.54647 +54 17 55.3700           ~ 10 1
12 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2544 2
13 NGC 5461 HII 14 03 40.96 +54 19 02.4           ~ 175 0
14 NGC 5471 EmG 14 04 28.627 +54 23 52.84           ~ 230 1

    Equat.    Gal    SGal    Ecl

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2020.07.08-07:45:57

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