2009A&A...501..973D


Query : 2009A&A...501..973D

2009A&A...501..973D - Astronomy and Astrophysics, volume 501, 973-983 (2009/7-3)

Metallicity of low-mass stars in Orion.

D'ORAZI V., RANDICH S., FLACCOMIO E., PALLA F., SACCO G.G. and PALLAVICINI R.

Abstract (from CDS):

Determining the metal content of low-mass members of young associations provides a tool that addresses different issues, such as triggered star formation or the link between the metal-rich nature of planet-host stars and the early phases of planet formation. The Orion complex is a well known example of possible triggered star formation and is known to host a rich variety of proto-planetary disks around its low-mass stars. Available metallicity measurements yield discrepant results. We analyzed FLAMES/UVES and Giraffe spectra of low-mass members of three groups/clusters belonging to the Orion association. Our goal is the homogeneous determination of the metallicity of the sample stars, which allows us to look for [Fe/H] differences between the three regions and for the possible presence of metal-rich stars. Nine members of the ONC and one star each in the λ Ori cluster and OB1b subgroup were analyzed. After the veiling determination, we retrieved the metallicity by means of equivalent widths and/or spectral synthesis using MOOG. We obtain an average metallicity for the ONC [Fe/H]=-0.01±0.04. No metal-rich stars were detected and the dispersion within our sample is consistent with measurement uncertainties. The metallicity of the λ Ori member is also solar, while the OB1b star has an [Fe/H] significantly below the ONC average. If confirmed by additional [Fe/H] determinations in the OB1b subgroup, this result would support the triggered star formation and the self-enrichment scenario for the Orion complex.

Abstract Copyright:

Journal keyword(s): stars: pre-main sequence - stars: abundances - open clusters and associations: individual: Orion - stars: planetary systems

Simbad objects: 21

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Number of rows : 21
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 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 258 0
2 Brun 252 Y*O 05 34 24.9600766056 -05 22 05.529603432   11.8 10.88   12.186 G0IV-V 48 0
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2209 1
4 JW 223 Y*O 05 35 02.4370390440 -05 20 46.414371696   17.525 16.327   13.415 K5 36 0
5 V* V2151 Ori Or* 05 35 05.4087268512 -05 27 17.091689616   15.744 14.822 13.60 12.856 K5.5 52 1
6 V* V480 Ori Or* 05 35 05.7297959472 -05 24 18.508465620 15.788 15.749 15.023 14.74 12.810 K4:e 44 1
7 [DM99] 24 Y*O 05 35 06.0624105619 +10 00 19.836115252 14.765   12.77 12.24 11.75 ~ 16 0
8 Cl Collinder 69 OpC 05 35 10 +09 48.8     2.8     ~ 288 0
9 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1568 1
10 M 42 OpC 05 35 17 -05 23.4           ~ 3970 0
11 NAME Ori Complex Cld 05 35.3 -05 23           ~ 405 0
12 V* MZ Ori TT* 05 35 20.9915029512 -05 31 21.713651508 15.666 15.202 14.628 14.01 12.637 M5 64 0
13 V* V493 Ori Or* 05 35 20.9946611784 -05 16 37.519116312   19.014 17.465   13.952 K7: 47 0
14 Ass Ori OB 1c As* 05 35 21 -05 20.5           ~ 133 1
15 V* V1523 Ori Or* 05 35 21.3933206784 -05 26 44.066403132 16.740 14.918 13.896 12.82 11.760 K6 53 0
16 V* V803 Ori Or* 05 35 34.9089490560 -05 29 14.408759076 16.810 15.451 14.489   12.624 K1-K4 50 0
17 V* AQ Ori Or* 05 35 52.0235284704 -05 28 47.178577920 16.444 15.177 14.310   12.619 K6 44 0
18 NAME Ori I As* 05 38 -02.8           ~ 592 0
19 NAME Garrison 1 OpC 05 38 42 -02 36.0           ~ 538 0
20 VXR PSPC 76 X 08 45 25.6 -52 52 00           ~ 2 0
21 Ass Ori OB 1a As* ~ ~           ~ 221 0

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2023.02.04-09:46:46

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