2019ApJ...873..107C

Query : 2019ApJ...873..107C

2019ApJ...873..107C - Astrophys. J., 873, 107-107 (2019/March-2)

The last 5 Gyr of galactic chemical evolution based on H II region abundances derived from a temperature independent method.

CARIGI L., PEIMBERT M. and PEIMBERT A.

Abstract (from CDS):

Most of the chemical evolution models are not very reliable for the last 5 Gyr of galactic evolution; this is mainly because abundance gradients found in the literature show a big dispersion for young objects; a big culprit of this is the dispersion found in H II region gradients. Part of this dispersion arises from two different methods used to determine O/H in H II regions: the direct method (DM), based on forbidden lines; and the temperature independent method (TIM), based on permitted lines; the differences between these two methods are about 0.25 dex. We present two chemical evolution models of our galaxy to fit the O/H gradients of H II regions, one obtained from the DM and the other obtained from the TIM. We find that the model based on the TIM produces an excellent fit to the observational stellar constraints (B-stars, Cepheids, and the Sun), while the model based on the DM fails to reproduce them. Moreover the TIM model reproduces the flattening observed in the 3-6 kpc galactocentric range; this flattening is attained with an inside-out star formation quenching in the inner disk starting ∼9 Gyr ago.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): HII regions - ISM: abundances - Galaxy: abundances - Galaxy: evolution

Simbad objects: 29

goto Full paper

goto View the references in ADS

Number of rows : 29
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2
2 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
3 SH 2-209 HII 04 11 06.7 +51 09 44           ~ 105 0
4 SH 2-212 HII 04 40 36.52 +50 27 44.3           ~ 102 2
5 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
6 NAME Ori I As* 05 38 -02.8           ~ 653 0
7 IC 466 HII 07 08 37 -04 18.8           ~ 49 0
8 NGC 2359 HII 07 18 30.000 -13 13 36.00           ~ 170 0
9 NGC 2467 OpC 07 52 18 -26 25.7           ~ 190 1
10 NGC 2579 OpC 08 20 55.3 -36 13 23           ~ 110 4
11 NGC 3576 HII 11 11 53.2 -61 18 26           ~ 245 2
12 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
13 M 20 OpC 18 02 42 -22 58.3           ~ 456 1
14 M 8 OpC 18 03 37 -24 23.2           ~ 644 1
15 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
16 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
17 SH 2-83 HII 19 24 30.01 +20 47 34.5           ~ 45 1
18 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
19 LBN 070.24+01.53 HII 20 01 44.7 +33 31 14           ~ 40 1
20 LBN 096.23+02.55 HII 21 28 42 +54 37.0           ~ 54 0
21 SH 2-128 HII 21 32 09.9 +55 52 53           ~ 173 1
22 IC 5146 OpC 21 53 29.3 +47 14 46           ~ 507 2
23 LBN 102.79-00.92 HII 22 19 09.0 +56 04 45           ~ 109 0
24 IRAS 22172+5549 Y*O 22 19 09.14787 +56 05 00.0380           ~ 105 0
25 IC 1470 HII 23 05 09.9 +60 14 31   11.5       ~ 180 2
26 NGC 7635 HII 23 20 48.3 +61 12 06           ~ 179 2
27 NAME Local Group GrG ~ ~           ~ 9325 0
28 NAME Galactic Bar reg ~ ~           ~ 1458 0
29 NAME Galactic Bulge reg ~ ~           ~ 4794 0

To bookmark this query, right click on this link: simbad:objects in 2019ApJ...873..107C and select 'bookmark this link' or equivalent in the popup menu