2011MNRAS.414...59S


Query : 2011MNRAS.414...59S

2011MNRAS.414...59S - Mon. Not. R. Astron. Soc., 414, 59-75 (2011/June-2)

Early-type stars observed in the ESO UVES paranal observatory project – III. Sub-parsec and au-scale structure in the interstellar medium.

SMOKER J.V., BAGNULO S., CABANAC R., KEENAN F.P., FOSSATI L., LEDOUX C., JEHIN E. and MELO C.

Abstract (from CDS):

UVES interstellar observations from the Paranal Observatory Project are presented for early-type stars located in the line of sight to the nearby open clusters IC 2391 (Omni Vel) and NGC 6475 (M7), with spectroscopic resolution R∼ 80 000 and signal-to-noise ratios in the Ti II (3383 Å), Ca II K, CH+ (4232 Å), Na I D and K I (7698 Å) lines of several hundred. The sightlines are a mixture of cluster and non-cluster objects. A total of 22 early-type stars (A and B type) are present in our sample towards IC 2391, with 21 towards NGC 6475/M7, and enable us to probe for differences in column density on scales from ∼0.07 to 7.3 and ∼0.05 to 4.9 pc in the respective clusters. Additionally, towards Praesepe the Na I D interstellar variation only is probed towards 13 sightlines and transverse scales of ∼0.16–10.7 pc at R= 70 000. Towards IC 2391 variations are found in Ti II, Ca II K and Na I D column density in different sightlines of up to 0.7, 1.0 and 1.8 dex (excluding one star), respectively. This kind of variability correlates well with the Hipparcos parallax of the objects, and probes structure within the Local Bubble. For cluster-only objects the variations are 0.3, 0.3 and 0.5 dex, respectively. For the field of view towards NGC 6475 the corresponding maximum variations are somewhat smaller, being 0.5, 0.3, 0.8 and 1.0 dex for Ti II, Ca II K, Na I and K I, respectively, for all objects and 0.4, 0.2, 0.6 and 0.7 dex for the cluster-only objects. These are uncorrelated with parallax, and again demonstrate that Ca II K tends to be more smoothly distributed than Na I D. A few likely cluster sightlines show evidence for CH+ and variations in this molecular species of a factor of 10 in equivalent width over sub-pc scales. Towards Praesepe variation in interstellar Na I D is small, being a maximum of only ∼0.4 dex (including measurement errors), but with fewer sightlines studied. Overall, the scatter in the data is similar for the singly ionized species Ti II and Ca II, lending more support to the hypothesis that these two species sample similar parts of the interstellar medium (ISM). This also appears to be the case for the neutral species Na I D and K I in the one cluster studied. Finally, multiple-epoch observations from a variety of archive sources are used to search for astronomical unit (au) scale structure in the ISM towards 46 sightlines. There are tentative indications of structure on scales of tens to thousands of au for three sightlines. Future observations will confirm the veracity or otherwise of the time-variable components and others presented.

Based on observations taken at UT2, Kueyen, Cerro Paranal, Chile, ESO DDT programme 265.D-5655(A), UVES Paranal Observatory Project and using FEROS on the ESO 2.2-m telescope, La Silla, Chile, programme ID 078.C-0493(A), the Observatoire de Haute Provence, France, the Pic du Midi telescope, France and the AAO archive. The outburst triggered by the Deep Impact collision with Comet Tempel 1


Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): stars: early-type - ISM: abundances - ISM: structure - open clusters and associations: individual: IC 2391 (ο Vel) - open clusters and associations: individual: NGC 6475 (M7) - open clusters and associations: individual: Praesepe (M44)

Simbad objects: 113

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Number of rows : 113
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 * 27 Tau SB* 03 49 09.7425852 +24 03 12.300277 3.18 3.54 3.63 3.62 3.68 B8III 371 0
2 HD 30677 * 04 50 03.6140690917 +08 24 28.243932216 5.94 6.82 6.84     B1II-III((n)) 61 0
3 * lam Eri Be* 05 09 08.7831482 -08 45 14.690823 3.17 4.07 4.27 4.35 4.55 B2III(e)p 290 1
4 * eta Ori EB* 05 24 28.61672 -02 23 49.7311 2.25 3.18 3.35 3.44 3.65 B1V+B2: 381 0
5 Cl Collinder 69 OpC 05 35 06 +09 56.0     2.8     ~ 249 0
6 * lam Ori A Em* 05 35 08.2792540686 +09 56 02.955355445 2.17 3.48 3.47     O8III((f)) 491 0
7 * zet Ori A SB* 05 40 45.527143 -01 56 33.26036   1.79 1.90     O9.2IbvarNwk 653 0
8 * bet Mon A Be* 06 28 49.0688084600 -07 01 59.016107399 3.87 4.50 4.60     B4Veshell 241 0
9 * bet Mon ** 06 28 49.06971 -07 01 59.0101 2.85 3.59 3.74 3.75 3.91 B4Ve+B2Vn(e)+B3V:nne 220 0
10 HD 50896 WR* 06 54 13.0440847499 -23 55 42.020318514 5.74 6.63 6.91 7.74   WN4b 750 0
11 * omi02 CMa s*b 07 03 01.4721150 -23 49 59.852308 2.14 2.94 3.02 3.01 3.10 B3Ia 308 0
12 HD 55879 * 07 14 28.2530122374 -10 18 58.483790697 4.88 5.85 6.03 7.35   O9.7III 158 0
13 * tau CMa EB* 07 18 42.4864191 -24 57 15.741299 3.26 4.25 4.40 4.44 4.62 O9II 403 0
14 * m Pup EB* 07 38 18.0454096 -25 21 53.301669   4.58 4.67     B8III 60 0
15 HD 66788 * 08 04 08.5402852477 -27 29 08.858514821 8.44 9.92 9.83 9.85   O8/9(Ib) 54 0
16 HD 69106 * 08 14 03.7993590115 -36 57 07.936730901 6.12 7.020 7.128 8.02   O9.7IIn 114 0
17 NAME Vela XYZ Rad 08 34.0 -45 50           ~ 1147 2
18 HD 73287 * 08 35 10.1222493411 -54 12 22.276638472   6.928 7.044     B7V 28 0
19 HD 72757 * 08 35 17.7710846928 +20 33 52.551983799   8.65 8.40     F0 18 0
20 HD 72846 * 08 35 45.0723566995 +19 46 16.180181777   7.62 7.48     A2 45 0
21 HD 73503 * 08 36 23.6129350204 -53 02 11.317222275 8.28 8.39 8.35     A0V 23 1
22 HD 73681 * 08 37 10.5861473077 -53 15 33.436587608   7.91 7.83     A1V 44 0
23 V* BR Cnc dS* 08 37 40.7066996206 +19 31 06.308866268   8.48 8.25     F0Vn 104 0
24 HD 73210 SB* 08 37 46.7638139163 +19 16 01.988338277   6.91 6.75     A5V 87 0
25 V* CY Cnc dS* 08 38 37.8616687005 +19 59 23.097436500   8.34 8.14     F0V 83 0
26 HD 73952 * 08 38 44.8069776775 -53 05 25.370461345   6.348 6.431     B8V 69 0
27 V* BS Cnc dS* 08 39 09.0980604568 +19 35 32.618111318   8.78 8.59     A9V 118 0
28 V* HW Vel bC* 08 39 23.8458293446 -53 26 23.134482935 4.72 5.291 5.439     B5V 99 0
29 HD 73574 ** 08 39 42.7919607909 +20 05 10.065754649   9.11 8.85 8.62   A5V 80 0
30 HD 74146 SB* 08 39 57.5996312070 -53 03 16.999913803 4.48 5.05 5.19     B5IV 102 0
31 HD 73619 SB* 08 39 57.7698375860 +19 32 29.327430944   7.76 7.52     Am 95 0
32 HD 74182 * 08 40 03.0290724998 -53 51 06.420624170   7.66 7.38     A5IV 28 0
33 V* OO Vel a2* 08 40 08.3509993324 -51 56 29.606819775   7.338 7.439     ApSi 40 0
34 HD 74196 Ce* 08 40 17.4650866640 -53 00 55.425805483 4.97 5.47 5.61     B9/A0 124 0
35 * omi Vel Pu* 08 40 17.5855320 -52 55 18.800233 2.8 3.44 3.63     B3/5(V) 164 1
36 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1319 0
37 IC 2391 OpC 08 40 32 -53 02.0           ~ 745 0
38 V* BV Cnc dS* 08 40 32.9592145589 +19 11 39.571077009   8.98 8.72     F0V 83 0
39 V* BN Cnc dS* 08 40 39.2361717103 +19 13 41.816611511   8.01 7.80     A9V 107 0
40 V* BW Cnc dS* 08 40 52.4782621428 +20 15 59.474768127   8.74 8.48     F0Vn 95 0
41 HD 73993 V* 08 41 53.1405196920 +20 09 33.982499946   8.84 8.56     F2Vn 53 0
42 V* BX Cnc dS* 08 42 06.4975124825 +19 24 40.526818039   8.17 7.97     A7V 105 0
43 HD 74516 * 08 42 09.9560639271 -52 58 03.652888578   7.40 7.38     A1V 60 0
44 V* BY Cnc dS* 08 42 10.8051242141 +18 56 03.751801350   8.09 7.91     A7Vn 84 0
45 HD 74536 * 08 42 12.2213911980 -53 22 11.779762307   7.92 7.94     B6IV 33 0
46 V* KT Vel a2* 08 42 18.9920732 -53 06 00.201557 4.79 5.340 5.474     B9III(pSi) 98 0
47 V* HY Vel SB* 08 42 25.3862731 -53 06 50.343091 3.97 4.655 4.815     B3IV 160 0
48 HD 74135 * 08 42 53.0641639632 +20 49 09.260183285   9.15 8.86     A9III 33 0
49 HD 74762 ** 08 43 35.7850049421 -53 31 28.801014427   7.94 7.74     A5V 29 0
50 HD 74999 * 08 45 03.2246221683 -53 32 39.756490792   9.12 8.99     A1V 16 0
51 V* V469 Vel EB* 08 45 15.5559697339 -53 51 27.621641564   9.80 9.45     A2/3mA7-A8 25 0
52 HD 74589 * 08 45 20.5291174657 +18 52 31.431110303   8.69 8.45     F0 30 0
53 HD 74587 dS* 08 45 28.2544056384 +20 23 43.407692236   9.164 8.48     A5 30 0
54 HD 75067 * 08 45 33.7837600650 -52 56 05.488474084 9.13 9.41 9.44     B8/9IV/V(n) 18 0
55 HD 75105 * 08 45 43.6145718288 -52 58 18.118382558 7.07 7.61 7.69     B8III/IV 31 0
56 HD 74656 * 08 45 46.5356642789 +19 02 58.074296486   8.25 8.00 8.0   Am 40 0
57 HD 75184 ** 08 46 15.111 -53 07 44.75   9.19 9.11     A1V 11 0
58 HD 74718 * 08 46 15.4645762519 +19 42 32.973568084   8.60 8.38     A5 32 0
59 V* OQ Vel RR* 08 46 23.1810289583 -52 50 37.385060426   7.87 7.69     A7V 51 1
60 HD 75466 * 08 48 00.2177900889 -52 51 00.546136029   6.186 6.266     B8V 50 0
61 HD 93131 WR* 10 43 52.2575981063 -60 07 04.016913264 5.52 6.43 6.48 7.46   WN6ha-w 283 0
62 HD 93827 * 10 48 31.3126488390 -60 56 10.348852880 8.64 9.44 9.35 9.76   B2Ib/II 36 0
63 HD 93840 * 10 49 08.6892447950 -46 46 41.827914937   7.71 7.79     B1/2Iab/b 64 0
64 HD 94493 V* 10 53 15.0993762232 -60 48 53.196012889 6.43 7.75 7.59 8.17   B0.5Iab/b 88 0
65 V* AG Car WR* 10 56 11.5779283438 -60 27 12.809532379 7.00 7.57 6.96 7.73   WN11h 602 0
66 HD 97253 SB* 11 10 42.0470936256 -60 23 04.112862713 6.42 7.24 7.09 8.08   O5III(f) 79 0
67 HD 99493 * 11 26 46.1124084718 -10 24 09.760972730   8.46 8.27     A3V 5 0
68 HD 103779 * 11 56 57.5477276437 -63 14 56.724935031 6.35 7.185 7.220 8.32   B0/1II 93 0
69 HD 116852 * 13 30 23.5190459533 -78 51 20.544585252 8.29 8.38 8.47     O8.5II-III((f)) 138 1
70 * 3 Cen ** 13 51 49.60136 -32 59 38.7067           B5III+B9IV 243 0
71 HD 133518 * 15 06 55.9722559425 -52 01 47.238970853 5.57 6.29 6.39     B2IVpHe 89 0
72 * b Sco * 15 50 58.7451174285 -25 45 04.662754169 3.84 4.552 4.635     B1.5Vn 274 0
73 * del Sco SB* 16 00 20.00528 -22 37 18.1431 1.30 2.20 2.32 2.36 2.49 B0.3IV 705 0
74 HD 146029 * 16 14 53.3247309044 -22 22 49.097571935   7.438 7.378     B9V 58 0
75 HD 148937 SB* 16 33 52.3867163783 -48 06 40.476619334 6.49 7.12 6.71 7.61   O6f?p 363 4
76 * tau Sco * 16 35 52.9528530 -28 12 57.661515 1.55 2.56 2.81 2.93 3.18 B0.2V 871 0
77 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1758 2
78 HD 150898 * 16 47 19.6577721736 -58 20 29.197848623 4.70 5.55 5.61 5.61 5.62 B0Ia/ab 126 0
79 HD 152003 s*b 16 52 47.3741588958 -41 47 08.991515676 6.90 7.47 7.08 6.72 6.35 O9.7IabNwk 113 1
80 HD 151990 * 16 53 28.5620807570 -52 37 51.339027294 8.66 9.48 9.39 9.84   O9/9.5Ib/II 33 0
81 HD 152270 WR* 16 54 19.6991728950 -41 49 11.535393651 6.26 6.80 6.597 6.72 6.39 WC7+O5-8 289 0
82 HD 154811 * 17 09 53.0868663445 -47 01 53.192207532 6.71 7.32 6.98 7.71   OC9.7Ib 80 0
83 HD 156359 * 17 21 18.7291056434 -62 55 05.383772092 8.55 9.52 9.72     B0Ia/ab 75 0
84 HD 157038 s*b 17 22 39.2179048420 -37 48 16.698784191 6.99 7.20 6.44 5.70 5.15 B3Iap 102 0
85 HD 162144 * 17 51 02.1251065558 -35 04 13.972058577   7.61 7.63     A0III/IV 27 0
86 HD 162187 * 17 51 14.1263307592 -34 35 33.960955291   9.79 9.63 9.88   A8/F0(V) 16 0
87 HD 162305 * 17 51 52.8807000857 -34 46 56.812540293   7.76 7.77     B8/9III/IV 38 0
88 HD 162306 ** 17 51 55.22 -35 04 57.6           B8IV 14 0
89 HD 320764 ** 17 52 09.8983264213 -34 53 40.334308527   9.38 9.38 9.55   ~ 35 1
90 V* V957 Sco Ro* 17 52 13.6615081010 -34 47 57.112713177 5.16 5.80 5.90     B6Ib 126 0
91 HD 162393 * 17 52 20.0209067314 -34 58 27.952876354   8.09 8.06     A0V 20 0
92 HD 162515 SB* 17 52 55.7709400104 -35 01 08.011530225   6.57 6.57     B9III 67 0
93 V* V958 Sco a2* 17 53 15.9791163139 -34 37 15.065041182   7.01 6.99     B8/9III 71 0
94 HD 162586 ** 17 53 19.58018 -34 43 50.9011   6.14 6.17     B3/5III 67 0
95 HD 162630 SB* 17 53 29.1770204973 -34 41 30.529481181   7.61 7.58     B9(III) 51 0
96 HD 162631 * 17 53 34.8635667836 -34 51 55.218657390   7.43 7.37     A0III 33 0
97 HD 162679 SB* 17 53 44.1374859988 -34 47 39.828379568   8.76 8.88 8.37   B9/A0(V) 51 0
98 HD 162678 * 17 53 45.4976687389 -34 47 09.707694519   6.38 6.38     B9/A0II/III 47 0
99 HD 162680 * 17 53 46.9967150035 -34 50 46.873079491   7.82 7.76     A1V 31 0
100 NGC 6475 OpC 17 53 51 -34 47.6           ~ 347 0
101 V* V906 Sco EB* 17 53 54.7731227 -34 45 09.785378   5.95 5.96     B9V+B9V 120 0
102 HD 162781 * 17 54 12.9990866778 -34 49 24.407085796   7.59 7.50     A0IV 34 0
103 HD 162780 SB* 17 54 14.3798093574 -34 43 39.529513416   6.94 6.91     A0(IV) 57 0
104 HD 162817 * 17 54 27.1228172070 -34 28 00.205736257   6.15 6.11     B9.5/A0III 69 0
105 HD 162888 * 17 54 47.8838863653 -34 32 31.803407028   6.99 6.98     B9/A0III 46 0
106 HD 162889 * 17 54 52.7894323944 -34 45 03.654809694   8.49 8.44     A0V 17 0
107 * 15 Sgr s*b 18 15 12.9061049161 -20 43 41.787295583 4.64 5.42 5.37 5.27 5.19 O9.7Iab 239 0
108 HD 168625 s*b 18 21 19.5486475779 -16 22 26.077308888 10.15 9.78 8.37 8.76   B6Iap 258 2
109 HD 168941 * 18 23 25.5604185404 -26 57 10.849966234 8.53 9.36 9.37 9.81   O9.5IVp 94 0
110 HD 177566 pA* 19 07 07.8860806147 -41 43 16.012778182 9 9.97 10.17     B5/7Ib 42 0
111 HD 179407 * 19 12 53.0016589362 -12 34 58.327252644 8.69 9.44 9.44     B0(II) 55 0
112 * bet Scl PM* 23 32 58.2589788 -37 49 05.757000 3.92 4.28 4.37 4.37 4.44 B9.5IIIpHgMnSi 169 0
113 NAME Local Bubble ISM ~ ~           ~ 744 0

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