2011A&A...530A..19B


Query : 2011A&A...530A..19B

2011A&A...530A..19B - Astronomy and Astrophysics, volume 530A, 19-19 (2011/6-1)

Elemental abundances of low-mass stars in the young clusters 25 Orionis and λ Orionis.

BIAZZO K., RANDICH S., PALLA F. and BRICENO C.

Abstract (from CDS):

We aim to derive the chemical pattern of the young clusters 25 Orionis and λ Orionis through homogeneous and accurate measurements of elemental abundances. We present flames/uves observations of a sample of 14 K-type targets in the 25 Ori and λ Ori clusters. We measured their radial velocities to confirm cluster membership. We derived stellar parameters and abundances of Fe, Na, Al, Si, Ca, Ti, and Ni using the code MOOG. All 25 Ori stars are confirmed cluster members without evidence of binarity; in λ Ori we identify one non member and one possible single-lined binary star. We find an average metallicity [Fe/H]=-0.05±0.05 for 25 Ori, where the error is the 1σ standard deviation from the average. The λ Ori members have a mean Fe abundance value of 0.01±0.01. The other elements show close-to-solar ratios and no star-to-star dispersion. Our results, along with previous metallicity determinations in the Orion complex, show a small but detectable dispersion in the [Fe/H] distribution of the complex. This appears to be compatible with large-scale star formation episodes and initial nonuniformity in the precloud medium. We show that, as expected, the abundance distribution of star-forming regions is consistent with the chemical pattern of the Galactic thin disk.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: 25 Orionis - open clusters and associations: individual: λ Orionis - stars: abundances - stars: low-mass - stars: pre-main sequence - techniques: spectroscopic

Nomenclature: Table 1: CVSO NNN (Nos 259-262) added.

CDS comments: In ref list Briceno et al. 2005, A&A, 129, 907 is a misprint for Briceno et al. 2005, AJ, 129, 907.

Simbad objects: 28

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Number of rows : 28
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 CVSO 259 TT* 04 58 29.2258057968 +02 02 15.756140292   17.66 16.13 16.06   K7.25 7 1
2 CVSO 260 TT* 04 58 41.8588458798 +02 33 46.086523769   16.842 15.594 15.714   M0.6 2 0
3 CVSO 261 TT* 04 58 47.0726924440 +02 15 02.475165508   16.995 15.630 15.578   M0 3 0
4 CVSO 262 TT* 04 58 56.127264 +01 54 43.23816   17.155 15.474 15.270   M1.5e 3 0
5 * psi01 Ori Be* 05 24 44.8273848312 +01 50 47.201915688 3.83 4.76 4.96 5.04 5.26 B1Vn 337 0
6 NAME 25 Ori Group OpC 05 24 48 +01 39.3           ~ 132 1
7 CVSO 207 TT* 05 24 52.2740152152 +01 38 43.911323412     13.63   12.47 K4 14 0
8 CVSO 211 TT* 05 25 08.7487974552 +01 45 54.134823096     13.98   12.74 K5 15 0
9 CVSO 214 TT* 05 25 17.0563500377 +01 48 22.290329234     13.42   12.38 K2 13 0
10 CVSO 35 TT* 05 25 45.914400 +01 45 50.11020   14.48 13.36 13.85 12.81 K7 17 0
11 * del Ori SB* 05 32 00.40009 -00 17 56.7424 0.96 2.02 2.41 2.32 2.54 O9.5IINwk 758 0
12 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 254 0
13 [DM99] 7 Y*O 05 34 05.5480545240 +09 42 46.588233204 14.983   12.75 12.16 11.61 ~ 14 0
14 [DM99] 14 Y*O 05 34 39.2075054342 +09 52 55.291058437 18.037   15.09 14.17 13.31 ~ 18 0
15 [DM99] 21 Y*O 05 34 49.9241869416 +09 41 01.735099764 17.704   14.54 13.68 12.84 ~ 15 0
16 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2160 1
17 [BNM2013] 53.02 113 LM* 05 35 05.9661971088 +09 52 07.964497200 18.438 18.7 17.0 13.80 13.03 K8 10 0
18 * lam Ori A Em* 05 35 08.2760807112 +09 56 02.991326316 2.17 3.48 3.47     O8III((f)) 496 0
19 * lam Ori ** 05 35 08.27761 +09 56 02.9611 2.45 3.48 3.66 3.72 3.89 O8IIIf+B0.5V 284 0
20 [DM99] 26 Y*O 05 35 08.3333895240 +09 42 53.740734912 14.992   12.92 12.33 11.8 ~ 16 1
21 Cl Collinder 69 OpC 05 35 10 +09 48.8     2.8     ~ 275 0
22 2MASS J05351622+0955185 Y*O 05 35 16.2216960600 +09 55 18.623119152 17.590     13.55 12.75 ~ 11 0
23 NAME Ori Complex Cld 05 35.3 -05 23           ~ 392 0
24 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 878 0
25 * sig Ori Y*O 05 38 44.7653828520 -02 36 00.283179888 2.54 3.58 3.79 3.87 4.11 O9.5V+B0.2V(n) 775 0
26 * ksi Ori SB* 06 11 56.3969311 +14 12 31.555546 3.65 4.31 4.48 4.53 4.69 B3IV 129 0
27 LBN 211.65-01.51 HII 06 45 28 +00 17.8           ~ 66 0
28 Ass Ori OB 1a As* ~ ~           ~ 216 0

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2022.08.09-03:20:41

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