2005A&A...441..181C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST10:34:01

2005A&A...441..181C - Astronomy and Astrophysics, volume 441, 181 (2005/10-1)

Interstellar 12C/13C ratios through CH+λλ3957,4232 absorption in local clouds: incomplete mixing in the ISM.

CASASSUS S., STAHL O. and WILSON T.L.

Abstract (from CDS):

The 12C/13C isotope ratio is a tracer of stellar yields and the efficiency of mixing in the ISM. 12CH+/13CH+ is not affected by interstellar chemistry, and is the most secure way of measuring 12C/13C in the diffuse ISM. R=12C/13C is 90 in the solar system. Previous measurements of 12CH+λλ3957.7,4232.3 and 13CH+λλ3958.2,4232.0 absorption toward nearby stars indicate some variations in 12C/13C, with values ranging from 40 to 90 suggesting inefficient mixing. Except for the cloud toward ζ Oph, these R values are strongly affected by noise. With UVES on the VLT we have improved on the previous interstellar 12C/13C measurements. The weighted 12C/13C ratio in the local ISM is 78.27±1.83, while the weighted dispersion of our measurements is 12.7, giving a 6.9σ scatter. Thus we report on a 6.9σ detection of 16.2% root-mean-square variations in the carbon isotopic ratio on scales of ∼100 pc: R=74.7±2.3 in the ζ Oph cloud, while R=88.6±3.0 toward HD 152235 in the Lupus clouds, R=62.2±5.3 towards HD 110432 in the Coalsack, and R=98.9±10.1 toward HD 170740. The observed variations in 13C/12C are the first significant detection of chemical heterogeneity in the local ISM.ME ZET OPH CLOUD

Abstract Copyright:

Journal keyword(s): ISM: abundances - ISM: clouds - ISM: molecules - ISM: individual objects: Coalsack - ISM: individual objects: Lupus cloud - ISM: individual objects: ζ Oph cloud

VizieR on-line data: <*** spectra not received at CDS *** >

Simbad objects: 29

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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 - 2020
#notes
1 * 20 Tau PM* 03 45 49.6065620 +24 22 03.886360 3.40 3.80 3.87 3.85 3.90 B8III 397 1
2 * 23 Tau Be* 03 46 19.5738428 +23 56 54.081244 3.70 4.12 4.18   4.16 B6IV(e) 412 2
3 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2978 0
4 * zet Per V* 03 54 07.9224751 +31 53 01.081262 2.19 2.97 2.85 2.71 2.62 B1Ib 812 0
5 * ksi Per ** 03 58 57.9022917 +35 47 27.713205 3.190 4.080 4.060 3.88 3.89 O7.5III(n)((f)) 789 0
6 HD 26676 *iN 04 13 34.5675817044 +10 12 44.933150307   6.268 6.249     B8V 91 1
7 * del Ori Al* 05 32 00.40009 -00 17 56.7424 0.96 2.02 2.41 2.32 2.54 B0III+O9V 742 0
8 * zet Pup BY* 08 03 35.04754 -40 00 11.3321 0.89 1.98 2.25 2.36 2.58 O4I(n)fp 1091 1
9 * gam02 Vel WR* 08 09 31.95013 -47 20 11.7108 0.64 1.58 1.83 1.85 2.00 WC8+O7.5III-V 839 0
10 NAME Coalsack Nebula DNe 12 31 19 -63 44.6           ~ 242 0
11 HD 110432 Be* 12 42 50.2655719413 -63 03 31.048323668 4.79 5.58 5.31     B0.5IVpe 268 0
12 NAME Lup Cloud SFR 16 03 -38.1           ~ 517 0
13 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 608 2
14 * chi Oph Be* 16 27 01.4349892 -18 27 22.493784 3.95 4.71 4.43 3.97 3.73 B2Vne 564 0
15 * mu. Nor s*b 16 34 05.0202815 -44 02 43.128156 4.05 4.99 4.94 6.36   O9.7Iab 258 0
16 NAME dze Oph Cloud Cld 16 37 09 -10 34.0           ~ 105 0
17 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1723 2
18 NAME Sco OB 1 As* 16 53.5 -41 57           ~ 191 0
19 HD 152235 s*b 16 53 58.8524252928 -41 59 39.573669251 6.47 6.92 6.38 5.84 5.42 B0.5Ia 175 0
20 * zet01 Sco s*b 16 53 59.7270104119 -42 21 43.313745214 4.80 5.31 4.79 4.32 3.86 B1Ia-0ek 347 0
21 HD 152424 s*b 16 55 03.3297426438 -42 05 26.993062976 6.11 6.69 6.27 7.49   OC9.2Ia 181 0
22 HD 154368 s*b 17 06 28.3687923960 -35 27 03.759955171 6.10 6.63 6.13 7.12   O9.5Iab 263 0
23 HD 157038 s*b 17 22 39.2179048420 -37 48 16.698784191 6.99 7.20 6.44 5.70 5.15 B3Iap 100 0
24 HD 161056 * 17 43 47.0220911640 -07 04 46.590611461 6.26 6.68 6.32 5.94 5.67 B3II/III 161 0
25 HD 169454 s*b 18 25 15.1938696996 -13 58 42.305035144 7.39 7.61 6.71 5.82 5.13 B1Ia 307 0
26 HD 170740 SB* 18 31 25.6939093858 -10 47 45.006621390 5.51 5.96 5.72     B2/3II 169 1
27 * P Cyg s*b 20 17 47.2020844 +38 01 58.552724 4.66 5.24 4.82 4.28 4.02 B1-2Ia-0ep 1130 1
28 * eps Cap Be* 21 37 04.8306787 -19 27 57.646354 3.69 4.35 4.55 4.60 4.74 B3V 239 0
29 NAME Local Bubble ISM ~ ~           ~ 693 0

    Equat.    Gal    SGal    Ecl

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2020.07.05-10:34:01

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