2017ApJ...836..162E

Query : 2017ApJ...836..162E

2017ApJ...836..162E - Astrophys. J., 836, 162-162 (2017/February-3)

A principal component analysis of the diffuse interstellar bands.

ENSOR T., CAMI J., BHATT N.H. and SODDU A.

Abstract (from CDS):

We present a principal component (PC) analysis of 23 line-of-sight parameters (including the strengths of 16 diffuse interstellar bands, DIBs) for a well-chosen sample of single-cloud sightlines representing a broad range of environmental conditions. Our analysis indicates that the majority (∼93%) of the variations in the measurements can be captured by only four parameters The main driver (i.e., the first PC) is the amount of DIB-producing material in the line of sight, a quantity that is extremely well traced by the equivalent width of the λ5797 DIB. The second PC is the amount of UV radiation, which correlates well with the λ5797/λ5780 DIB strength ratio. The remaining two PCs are more difficult to interpret, but are likely related to the properties of dust in the line of sight (e.g., the gas-to-dust ratio). With our PCA results, the DIBs can then be used to estimate these line-of-sight parameters.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): ISM: lines and bands - ISM: molecules - methods: data analysis - methods: statistical - methods: statistical

Simbad objects: 32

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Number of rows : 32
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 HD 15137 SB* 02 27 59.8113542520 +52 32 57.589857672 7 7.92 7.86     O9.5II-IIIn 131 0
2 * o Per * 03 42 22.6459308614 +33 57 54.093701142 4.13 4.912 4.972     B0.5V 299 0
3 * omi Per ** 03 44 19.13204 +32 17 17.6929 3.13 3.88 3.83 3.71 3.71 B1III 605 0
4 * eta Tau Be* 03 47 29.0765529 +24 06 18.488347 2.44 2.78 2.87 2.84 2.88 B7III 538 1
5 * zet Per s*b 03 54 07.9224751 +31 53 01.081262 2.19 2.97 2.85 2.71 2.62 B1Ib 857 0
6 V* X Per HXB 03 55 23.0777456088 +31 02 45.039836148 6.090 6.840 6.720     O9.5III 980 0
7 * eps Per bC* 03 57 51.2320472 +40 00 36.775143 1.71 2.71 2.89 2.96 3.14 B0.5III 520 0
8 * ksi Per ** 03 58 57.9024302099 +35 47 27.709515737 3.190 4.080 4.060 3.88 3.89 O7.5III(n)((f)) 833 0
9 * 62 Tau * 04 23 59.7627483096 +24 18 03.527065188 6.18 6.499 6.337     B3V 218 0
10 * 23 Ori SB* 05 22 50.0039865384 +03 32 40.051458204 3.99 4.86 5.00 5.05 5.23 B2IV/V 247 0
11 * psi02 Ori bC* 05 26 50.2293232104 +03 05 44.422154160 3.45 4.398 4.611     B2IV 206 0
12 * phi01 Ori Y*O 05 34 49.2376273598 +09 29 22.510380606 3.29 4.26 4.41 4.42 4.59 B0III 259 0
13 * lam Ori A Em* 05 35 08.2760807112 +09 56 02.991326316 2.17 3.48 3.47     O8III((f)) 509 0
14 * 139 Tau s*b 05 57 59.6569390499 +25 57 14.083803544 3.82 4.76 4.82 4.76 4.87 B1Ia 281 0
15 HD 110432 HXB 12 42 50.2663572384 -63 03 31.052981412 4.79 5.58 5.31     B0.5IVpe 312 0
16 * del Sco SB* 16 00 20.00528 -22 37 18.1431 1.30 2.20 2.32 2.36 2.49 B0.3IV 741 0
17 * bet01 Sco bC* 16 05 26.2319826 -19 48 19.630018 1.68 2.55 2.62 2.60 2.69 B1V 562 0
18 * nu. Sco ** 16 11 59.73568 -19 27 38.5361 3.42 4.05 4.00 3.90 3.87 B2V 382 0
19 * sig Sco bC* 16 21 11.3157134 -25 35 34.051476 2.32 3.02 2.89 1.69 1.58 B1III+B1:V 871 0
20 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 648 0
21 * rho Oph A * 16 25 35.1185711280 -23 26 49.831640736 4.3 5.22 5.05     B1V 417 0
22 * zet Oph Be* 16 37 09.5400587698 -10 34 01.509742704 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1843 0
23 * 66 Oph Be* 18 00 15.7957050537 +04 22 07.122326765 3.77 4.58 4.60 4.47 4.49 B2Ve 347 0
24 NAME Her 36SE SB* 18 03 40.3201232304 -24 22 42.857540472 10.26 11.022 10.372 10.267   O8V+ 194 0
25 HD 170740 SB* 18 31 25.6939245072 -10 47 45.008376432 5.51 5.96 5.72     B2V+ 197 1
26 * 55 Cyg s*b 20 48 56.2915921440 +46 06 50.883645024 4.83 5.28 4.86 4.41 4.10 B4Ia 493 0
27 * ups Cyg Be* 21 17 55.0858548408 +34 53 48.825463560 3.50 4.32 4.42 4.37 4.45 B2Vne 316 0
28 HD 207198 Y*? 21 44 53.2791389640 +62 27 38.048647248 5.61 6.25 5.94 5.66 5.49 O8.5II 347 0
29 * 19 Cep * 22 05 08.7897533088 +62 16 47.332569936 4.36 5.19 5.11 4.95 4.92 O9Ib 380 0
30 * 10 Lac ** 22 39 15.6786372 +39 03 00.971152 3.650 4.670 4.880 4.98 5.19 O9V 758 0
31 * 12 Lac bC* 22 41 28.6495065456 +40 13 31.609736580 4.24 5.080 5.229     B2III 357 0
32 * 1 Cas * 23 06 36.8177774777 +59 25 11.135356051 3.93 4.771 4.840     B0.5III 245 0

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