2011A&A...525A..35B


Query : 2011A&A...525A..35B

2011A&A...525A..35B - Astronomy and Astrophysics, volume 525A, 35-35 (2011/1-1)

Chemical pattern across the young associations ONC and OB1b.

BIAZZO K., RANDICH S. and PALLA F.

Abstract (from CDS):

Abundances of iron-peak and α-elements are poorly known in Orion, and the available measurements yield contradictory results. We measure accurate and homogeneous elemental abundances of the Orion subgroups ONC and OB1b, and search for abundance differences across the Orion complex. We present flames/uves spectroscopic observations of 20 members of the ONC and OB1b. We measured radial velocity, veiling, effective temperature using two spectroscopic methods, and determined the chemical abundances of Fe, Na, Al, Si, Ca, Ti, and Ni using the code MOOG. We also performed a new consistent analysis of spectra previously analyzed by our group. We find three new binaries in the ONC, two in OB1b, and three non-members in OB1b (two of them most likely being OB1a/25 Ori members). Veiling only affects one target in the ONC, and the effective temperatures derived using two spectroscopic techniques agree within the errors. The ONC and OB1b are characterized by a small scatter in iron abundance, with mean [Fe/H] values of -0.11±0.08 and -0.05±0.05, respectively. We find a small scatter in all the other elemental abundances. We confirm that P1455 is a metal-rich star in the ONC. We conclude that the Orion metallicity is not above the solar value. The OB1b group might be slightly more metal-rich than the ONC; on the other hand, the two subgroups have similar almost solar abundances of iron-peak and α-elements with a high degree of homogeneity.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: Orion Complex - stars: abundances - stars: low-mass - stars: pre-main sequence - stars: late-type - techniques: spectroscopic

Simbad objects: 44

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Number of rows : 44
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME THA As* 00 00 -62.0           ~ 380 0
2 Cl Blanco 1 OpC 00 04 07 -29 50.0           ~ 260 0
3 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 778 0
4 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3105 0
5 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3748 0
6 CVSO 56 TT* 05 29 08.8274968488 -01 25 39.421500721     14.81   13.28 K7 7 0
7 Kiso A-0903 176 TT* 05 29 23.2625727937 -01 25 15.452132646     14.79   13.27 K7 13 0
8 CVSO 65 TT* 05 29 37.441848 -01 35 47.14728   16.09 14.78 13.96 13.12 K6 5 0
9 CVSO 118 TT* 05 33 25.7451502785 -01 32 18.861653937     14.70   13.44 K5 5 0
10 CVSO 125 TT* 05 33 49.1877863834 -01 15 45.526486617     14.53   13.19 K5 8 0
11 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 242 0
12 CVSO 128 TT* 05 34 08.5822925099 -01 22 46.786043504     14.65   13.15 K6 6 0
13 CVSO 129 TT* 05 34 11.3544399278 -01 30 31.491605852     14.15   12.92 K6 7 0
14 Brun 252 Y*O 05 34 24.9604417787 -05 22 05.526114586   11.8 10.88   12.186 G0IV-V 42 0
15 V* KM Ori Or* 05 34 55.9722690466 -05 23 13.040121857 14.142 12.883 11.918   10.064 K5Ve 92 0
16 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2067 1
17 V* LU Ori Or* 05 35 11.4963856167 -05 26 02.387177088 16.158 14.823 13.781   11.454 M1 47 0
18 V* V2221 Ori Or* 05 35 11.9699139872 -05 20 33.055093789   18.548 16.904   13.207 K2-K3 48 0
19 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1514 1
20 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 512 0
21 NAME Ori Complex Cld 05 35.3 -05 23           ~ 362 0
22 V* V1229 Ori Or* 05 35 18.3705822175 -05 22 37.440220823 15.941 14.257 13.251   10.987 K0 82 0
23 V* MU Ori Or* 05 35 18.8973219721 -05 16 13.919998409 15.508 14.465 13.677   12.300 K3-K4 52 0
24 V* V1338 Ori BY* 05 35 20.1660666616 -05 26 39.122010013 15.869 14.434 13.479 12.76 11.443 K0 48 0
25 Ass Ori OB 1c As* 05 35 21 -05 20.5           ~ 130 1
26 V* V1531 Ori Or* 05 35 23.3952894538 -05 18 50.630783844 18.661 16.938 15.674   12.912 M0.5 40 0
27 V* V2498 Ori Or* 05 35 31.2459745255 -05 23 40.058632374   16.498 15.420   13.024 K3-K5 35 0
28 V* V803 Ori Or* 05 35 34.9087873832 -05 29 14.408857778 16.810 15.451 14.489   12.624 K1-K4 49 0
29 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 868 0
30 NAME Ori I As* 05 38 -02.8           ~ 570 0
31 CVSO 159 TT* 05 38 20.6052858177 -01 13 18.939475876     14.05   12.98 K7 7 0
32 CVSO 161 TT* 05 38 27.8209235897 -01 07 57.879003724     14.32   12.92 K6 5 0
33 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 506 0
34 Kiso A-0904 76 TT* 05 39 02.5739785918 -01 20 32.419878298     13.73   12.33 K6 8 1
35 HD 294297 * 05 40 27.5430927797 -02 25 43.159707809   10.7 10.117 10.01 9.77 G2: 26 0
36 NGC 2451A OpC 07 43 12 -38 24.0           ~ 89 0
37 NGC 2516 OpC 07 58 04 -60 45.2           ~ 615 0
38 IC 2391 OpC 08 40 32 -53 02.0           ~ 741 0
39 IC 2602 OpC 10 42 58 -64 24.0           ~ 582 0
40 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 717 0
41 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3200 1
42 IC 4665 OpC 17 46 18 +05 43.0           ~ 326 0
43 Ass Ori OB 1a As* ~ ~           ~ 205 0
44 NAME Ass Ori OB 1-D As* ~ ~           ~ 9 0

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2021.08.05-00:14:05

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