2011ApJ...727...33F


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.31CET12:53:39

2011ApJ...727...33F - Astrophys. J., 727, 33 (2011/January-3)

Studies of diffuse interstellar bands V. Pairwise correlations of eight strong DIBs and neutral hydrogen, molecular hydrogen, and color excess.

FRIEDMAN S.D., YORK D.G., McCALL B.J., DAHLSTROM J., SONNENTRUCKER P., WELTY D.E., DROSBACK M.M., HOBBS L.M., RACHFORD B.L. and SNOW T.P.

Abstract (from CDS):

We establish correlations between equivalent widths of eight diffuse interstellar bands (DIBs), and examine their correlations with atomic hydrogen, molecular hydrogen, and EB–V. The DIBs are centered at λλ 5780.5, 6204.5, 6283.8, 6196.0, 6613.6, 5705.1, 5797.1, and 5487.7, in decreasing order of Pearson's correlation coefficient with N(H) (here defined as the column density of neutral hydrogen), ranging from 0.96 to 0.82. We find the equivalent width (EW) of λ5780.5 is better correlated with column densities of H than with EB–V or H2, confirming earlier results based on smaller data sets. We show that the same is true for six of the seven other DIBs presented here. Despite this similarity, the eight strong DIBs chosen are not correlated well enough with each other to suggest they come from the same carrier. We further conclude that these eight DIBs are more likely to be associated with H than with H2, and hence are not preferentially located in the densest, most UV shielded parts of interstellar clouds. We suggest that they arise from different molecules found in diffuse H regions with very little H2(molecular fraction f < 0.01). Of the 133 stars with available data in our study, there are three with significantly weaker λ5780.5 than our mean H-λ5780.5 relationship, all of which are in regions of high radiation fields, as previously noted by Herbig. The correlations will be useful in deriving interstellar parameters when direct methods are not available. For instance, with care, the value of N(H) can be derived from Wλ(5780.5).

Abstract Copyright:

Journal keyword(s): ISM: lines and bands - ISM: molecules

Simbad objects: 49

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Number of rows : 49

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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9566 1
2 * eps Cas Be* 01 54 23.7261769782 +63 40 12.372216932 2.61 3.22 3.37 3.40 3.52 B3Vp_sh 179 0
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5766 1
4 * o Per * 03 42 22.6455526 +33 57 54.089323 4.13 4.912 4.972     B0.5V 281 0
5 * omi Per ** 03 44 19.13204 +32 17 17.6929 3.13 3.88 3.83 3.71 3.71 B1III 576 0
6 * zet Per V* 03 54 07.9224751 +31 53 01.081262 2.19 2.97 2.85 2.71 2.62 B1Ib 816 0
7 V* X Per HXB 03 55 23.0778791365 +31 02 45.045745259 6.090 6.840 6.720     O9.5III 909 0
8 * alf Cam s*b 04 54 03.0103983 +66 20 33.636467 3.47 4.34 4.29 4.18 4.18 O9Ia 639 1
9 V* AE Aur Or* 05 16 18.1489437436 +34 18 44.347016027 5.48 6.18 5.96     O9.5V 529 1
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15001 1
11 * phi01 Ori SB* 05 34 49.2380370 +09 29 22.487814 3.29 4.26 4.41 4.42 4.59 B0III 244 0
12 * tet01 Ori B Al* 05 35 16.112 -05 23 06.89 7.71 8.20 7.96     B1V 344 2
13 * tet01 Ori C ** 05 35 16.46375 -05 23 22.8486 4.20 5.15 5.13 4.91 4.73 O7Vp 1285 1
14 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1484 1
15 HD 37061 Or* 05 35 31.3653515656 -05 16 02.586154009 6.44 7.09 6.83     O9V 327 0
16 HD 37367 * 05 39 18.3132076044 +29 12 54.788289500 5.6 6.116 5.984     B2IV-V 122 0
17 HD 37903 Em* 05 41 38.3889407943 -02 15 32.476182358 7.32 7.94 7.83 7.64 7.52 B3IV 326 1
18 HD 40839 * 06 01 02.2831883543 -10 03 46.791154362   8.59 8.61     G8/K0III 4 0
19 HD 50064 Em* 06 51 34.1060183287 +00 17 50.465846394 8.75 9.06 8.30 7.51 6.88 B6Ie 82 1
20 HD 53975 * 07 06 35.9656022838 -12 23 38.216531612 5.38 6.40 6.50 6.51   O7.5Vz 179 0
21 NGC 2362 OpC 07 18 41 -24 57.3     4.1     ~ 361 0
22 * bet01 Sco SB* 16 05 26.2319826 -19 48 19.630018 1.68 2.55 2.62 2.60 2.69 B1V 535 0
23 * bet02 Sco SB* 16 05 26.5721765504 -19 48 06.862525792 4.19 4.87 4.89 5.58   B2V 199 0
24 * ome Sco bC* 16 06 48.4269211 -20 40 09.090235 3.10 3.92 3.97 3.91 3.99 B1V 442 0
25 * nu. Sco ** 16 11 59.73568 -19 27 38.5361 3.42 4.05 4.00 3.90 3.87 B2V 358 0
26 * sig Sco bC* 16 21 11.3157134 -25 35 34.051476 2.32 3.02 2.89 1.69 1.58 O9.5(V)+B7(V) 830 0
27 HD 147889 pr* 16 25 24.3162969787 -24 27 56.570239619 8.56 8.73 7.90     B2III/IV 439 1
28 NAME rho Oph A Cloud MoC 16 26 26.4 -24 22 33           ~ 241 1
29 NAME Sco-Oph Region reg 16 30.0 -21 00           ~ 72 0
30 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1738 2
31 HD 157857 Em* 17 26 17.3320365674 -10 59 34.785692564 7.16 7.95 7.78     O6.5II(f) 158 0
32 NAME Herschel 36 ** 18 03 40.321 -24 22 42.86 10.26 10.88 10.30 10.27   O7:V 181 2
33 HD 166734 s*b 18 12 24.6552422490 -10 43 53.059483541 9.36 9.49 8.42 7.33 6.47 O7.5Iabf 161 0
34 * mu. Sgr s*b 18 13 45.8088401 -21 03 31.794073 3.60 4.07 3.85 3.58 3.38 B8Iab(e) 336 0
35 HD 169454 s*b 18 25 15.1938696996 -13 58 42.305035144 7.39 7.61 6.71 5.82 5.13 B1Ia 311 0
36 HD 172028 SB* 18 37 56.6193996607 -00 23 09.063879534   8.39 7.92     B3II/III 49 1
37 HD 183143 s*b 19 27 26.5636908636 +18 17 45.191198361 8.25 8.08 6.86 5.74 4.79 B6Ia 413 0
38 HD 186994 EB* 19 45 37.9686174027 +44 57 49.470259749 6.43 7.37 7.50     B0III 77 0
39 HD 229059 s*b 20 21 15.3643765026 +37 24 31.103826768 10.66 10.23 8.70     B2Iabe 89 0
40 HD 194839 Em* 20 26 21.5478243332 +41 22 45.635833450 8.40 8.49 7.49     B0.5Iae 111 0
41 BD+40 4220 EB* 20 32 22.4241357648 +41 18 18.942382590 11.32 10.79 9.185     O6.5-7f+O5.5-6f 371 0
42 Schulte 12 s*b 20 32 40.9574572449 +41 14 29.276333992 16.1 14.45 11.702     B3-4Ia+ 363 0
43 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 801 0
44 HD 201345 * 21 07 55.4153633777 +33 23 49.226678368   7.611 7.764     ON9.2IV 161 0
45 HD 204827 SB* 21 28 57.7601719555 +58 44 23.223287944 8.63 8.74 7.94 7.25 6.76 O9.5IV 306 0
46 HD 206773 Be* 21 42 24.1855487400 +57 44 09.791063937 6.30 7.10 6.87     B0V:pe 149 0
47 HD 219188 * 23 14 00.5157363255 +04 59 49.564031036   6.90 7.06     K0III 152 0
48 BD+63 1964 * 23 17 21.5627349678 +64 07 16.166348285 8.79 9.05 8.5     B0 76 0
49 * 6 Cas ** 23 48 50.17052 +62 12 52.2577       6.60   A2.5(I)+O9.8II 181 0

    Equat.    Gal    SGal    Ecl

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2020.10.31-12:53:39

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