2008A&A...477..865S


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.23CEST22:24:52

2008A&A...477..865S - Astronomy and Astrophysics, volume 477, 865-875 (2008/1-3)

Interstellar 12C/13C from CH+ absorption lines: results from an extended survey.

STAHL O., CASASSUS S. and WILSON T.

Abstract (from CDS):

The 12C/13C isotope ratio in the interstellar medium (ISM) and its evolution with time are important tracers of stellar yields. Spatial variations in this ratio can be used to study mixing in the ISM@. We want to determine this ratio and its spatial variations in the local ISM from CH+ absorption lines in the optical towards early-type stars. The aim is to determine the average value for the local ISM and to study possible spatial variations. We observed a large number of early-type stars with Feros to extend the sample of suitable target stars for CH+ isotope studies. The best-suited targets were observed with the Uves instrument with a higher signal-to-noise ratio and spectral resolution to determine the isotope ratio from the interstellar CH+ lines. This study significantly expands the number of 13CH+ detections. We find an average ratio of <R≥76.27±1.94 or, for f=1/R, <f≥(120.46±3.02)x10–4. The scatter in f is 6.3xσ(<f>). This finding strengthens the case for chemical inhomogeneity in the local ISM, with important implications for the mixing in the ISM@. Given the large scatter, the present-day value in the ISM is not significantly larger than the solar value, which is assumed to correspond to the local value 4.5Gyr ago.

Abstract Copyright:

Journal keyword(s): ISM: abundances - ISM: clouds - ISM: molecules - ISM: evolution - Galaxy: evolution - Galaxy: abundances

Simbad objects: 24

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Number of rows : 24

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 * alf Eri Be* 01 37 42.84548 -57 14 12.3101 -0.36 0.30 0.46 0.49 0.60 B6Vpe 445 0
2 * 23 Tau Be* 03 46 19.5738428 +23 56 54.081244 3.70 4.12 4.18   4.16 B6IV(e) 413 2
3 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3007 0
4 * 23 Ori SB* 05 22 50.0047401166 +03 32 39.976975214 3.99 4.86 5.00 5.05 5.23 B2IV/V 231 0
5 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 571 1
6 HD 37903 Em* 05 41 38.3889407943 -02 15 32.476182358 7.32 7.94 7.83 7.64 7.52 B3IV 324 1
7 HD 52266 SB* 07 00 21.0761535622 -05 49 35.948161271 6.32 7.22 7.23     O9.5IIIn 106 0
8 HD 52382 * 07 00 39.3386037216 -09 12 10.678042594 6.07 6.76 6.57 6.29 6.19 B0.5Ia 102 0
9 HD 53974 ** 07 06 40.76672 -11 17 38.4396 4.59 5.44 5.39 6.80   B0IIIn 173 1
10 NAME CMa OB1 As* 07 07.0 -10 28           ~ 125 0
11 CCDM J07251-2110AB ** 07 25 07.96647 -21 10 25.8831 6.15 9.10 8.84 7.65   B1Ia 62 1
12 NAME GUM Nebula ISM 07 43 -42.1           ~ 388 1
13 HD 73882 EB* 08 39 09.53412 -40 25 09.2608 7.07 7.59 7.19 6.67 6.30 O8.5IV 219 2
14 HD 75149 s*b 08 46 30.5468343288 -45 54 45.012400213 5.25 5.677 5.459 6.77   B5Iab 99 0
15 Ass Vel OB 1 As* 08 49.9 -45 00           ~ 94 0
16 HD 76341 Em* 08 54 00.6139143219 -42 29 08.767038173 6.88 7.392 7.163 8.08   O9.2IV 91 1
17 HD 91452 * 10 31 50.5946606809 -63 56 25.689335931 7 8.83 8.60 8.35   B0III 54 1
18 Ass Car OB 1 As* 10 38 -59.0           ~ 144 0
19 HD 92964 s*b 10 42 40.5663586355 -59 12 56.727932428 5.12 5.78 5.51 5.30 5.00 B2.5Ia 137 0
20 * alf01 Cru * 12 26 35.896 -63 05 56.73   1.10 1.28     B0.5IV 138 0
21 HD 110432 Be* 12 42 50.2655719413 -63 03 31.048323668 4.79 5.58 5.31     B0.5IVpe 270 0
22 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1732 2
23 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
24 HD 170740 SB* 18 31 25.6939093858 -10 47 45.006621390 5.51 5.96 5.72     B2/3II 170 1

    Equat.    Gal    SGal    Ecl

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2020.09.23-22:24:52

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