2017ApJ...850..138M


Query : 2017ApJ...850..138M

2017ApJ...850..138M - Astrophys. J., 850, 138-138 (2017/December-1)

Interstellar silicon depletion and the ultraviolet extinction.

MISHRA A. and LI A.

Abstract (from CDS):

Spinning small silicate grains were recently invoked to account for the Galactic foreground anomalous microwave emission. These grains, if present, will absorb starlight in the far-ultraviolet (UV). There is also renewed interest in attributing the enigmatic 2175 Åinterstellar extinction bump to small silicates. To probe the role of silicon in the UV extinction, we explore the relations between the amount of silicon required to be locked up in silicates [Si/H]dust and the 2175 Åbump or the far-UV extinction rise, based on an analysis of the extinction curves along 46 Galactic sightlines for which the gas-phase silicon abundance [Si/H]gas is known. We derive [Si/H]dust either from [Si/H]ISM-[Si/H]gas or from the Kramers-Kronig relation, which relates the wavelength-integrated extinction to the total dust volume, where [Si/H]ISM is the interstellar silicon reference abundance and taken to be that of proto-Sun or B stars. We also derive [Si/H]dust from fitting the observed extinction curves with a mixture of amorphous silicates and graphitic grains. We find that in all three cases [Si/H]dust shows no correlation with the 2175 Åbump, while the carbon depletion [C/H]dust tends to correlate with the 2175 Åbump. This supports carbon grains instead of silicates as the possible carriers of the 2175 Åbump. We also find that neither [Si/H]dust nor [C/H]dust alone correlates with the far-UV extinction, suggesting that the far-UV extinction is a combined effect of small carbon grains and silicates.

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

Journal keyword(s): dust, extinction - ISM: abundances - ISM: clouds - ISM: clouds

Simbad objects: 47

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Number of rows : 47
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 HD 1383 SB* 00 18 17.7370251744 +61 43 37.404185232 7.23 7.89 7.63     B0II 82 0
2 * kap Cas s*b 00 32 59.9911963 +62 55 54.417374 3.50 4.30 4.16 4.02 3.96 B1Ia 457 0
3 HD 4117 ** 00 44 02.6996144640 +46 57 52.879387752   8.748 8.490 8.87   A5 10 0
4 * omi Per ** 03 44 19.13204 +32 17 17.6929 3.13 3.88 3.83 3.71 3.71 B1III 590 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)) 818 0
6 * 62 Tau * 04 23 59.7627483096 +24 18 03.527065188 6.18 6.499 6.337     B3V 208 0
7 * alf Cam s*b 04 54 03.0103983 +66 20 33.636467 3.47 4.34 4.29 4.18 4.18 O9Ia 649 1
8 V* AE Aur Or* 05 16 18.1493304816 +34 18 44.344404000 5.48 6.18 5.96     O9.5V 546 1
9 * tet01 Ori B EB* 05 35 16.1339860056 -05 23 06.784444248 7.71 8.20 7.96     B1V 360 2
10 HD 37061 Or* 05 35 31.3649044920 -05 16 02.582064192 6.44 7.09 6.83     O9.5V 348 0
11 * chi02 Ori s*b 06 03 55.1843706432 +20 08 18.428141364 4.24 4.91 4.63 4.32 4.10 B2Ia 440 0
12 * 3 Gem s*b 06 09 43.9852949424 +23 06 48.472220448 5.33 5.96 5.75     B3Ia 223 0
13 HD 45314 Be* 06 27 15.7784072112 +14 53 21.212913660 5.91 6.79 6.64     O9:npe 168 0
14 HD 46056 Em* 06 31 20.8608343776 +04 50 03.842554740 7.60 8.36 8.16 8.16 8.09 O8Vn 218 0
15 HD 46202 ** 06 32 10.4728 +04 57 59.818 7.60 8.36 8.19 7.98 7.86 O9.2V 270 0
16 HD 69106 * 08 14 03.7995306624 -36 57 07.938057852 6.12 7.020 7.128 8.02   O9.7IIn 117 0
17 V* V560 Car SB* 10 44 33.7393258944 -59 44 15.434446956 6.89 7.80 7.75 7.56 7.46 O3.5V((f))+O8V 292 0
18 HD 303308 ** 10 45 05.9147911152 -59 40 05.925360036 7.45 8.30 8.17 7.92 7.75 O4.5V((fc)) 290 0
19 HD 93843 Er* 10 48 37.7715351864 -60 13 25.518487656 6.37 7.29 7.33 8.23   O5III(fc) 166 0
20 HD 101190 ** 11 38 09.9116823600 -63 11 48.614641440 6.58 7.37 7.33 8.48   O6IV((f)) 160 0
21 HD 112244 s*b 12 55 57.1336250856 -56 50 08.900570292 4.49 5.33 5.32 5.21 5.21 O8.5Iab(f)p 202 0
22 HD 116852 * 13 30 23.5185791544 -78 51 20.547734652 8.29 8.38 8.47     O8.5II-III((f)) 143 1
23 HD 122879 V* 14 06 25.1578487688 -59 42 57.254187024 5.90 6.64 6.50 6.33 6.18 B0Ia 166 1
24 * pi. Sco EB* 15 58 51.1132378 -26 06 50.788602 1.82 2.71 2.91 3.00 3.20 B1V+B2:V: 389 0
25 * del Sco SB* 16 00 20.00528 -22 37 18.1431 1.30 2.20 2.32 2.36 2.49 B0.3IV 723 0
26 * bet01 Sco bC* 16 05 26.2319826 -19 48 19.630018 1.68 2.55 2.62 2.60 2.69 B1V 548 0
27 * sig Sco bC* 16 21 11.3157134 -25 35 34.051476 2.32 3.02 2.89 1.69 1.58 B1III+B1:V 853 0
28 HD 147888 ** 16 25 24.2915998776 -23 27 36.747568152 6.71 7.05 6.74     B3V 205 0
29 * rho Oph A * 16 25 35.1185711280 -23 26 49.831640736 4.3 5.22 5.05     B1V 399 0
30 * mu. Nor s*b 16 34 05.0202815 -44 02 43.128156 4.05 4.99 4.94 6.36   O9.7Iab 267 0
31 HD 149404 s*b 16 36 22.5628499784 -42 51 31.902127776 5.23 5.88 5.52 6.90   O8.5Iab(f)p 240 1
32 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1806 2
33 HD 151804 s*b 16 51 33.7218052272 -41 13 49.919519496 4.45 5.29 5.22     O8Iaf 365 0
34 * zet01 Sco s*b 16 53 59.7271314888 -42 21 43.307334468 4.80 5.31 4.79 4.32 3.86 B1Ia-0ek 362 0
35 HD 152233 SB* 16 54 03.5909222280 -41 47 29.841281484 5.93 6.72 6.59     O6II(f) 189 0
36 HD 152408 s*b 16 54 58.5051071856 -41 09 03.093075612 5.17 5.92 5.77 7.00   O8Iape 364 0
37 HD 154368 s*b 17 06 28.3687759224 -35 27 03.760593156 6.10 6.63 6.13 7.12   O9.5Iab 280 0
38 * 9 Sgr Em* 18 03 52.4450051016 -24 21 38.632254012 5.08 5.97 5.97 5.72 5.70 O4V((f))z 531 0
39 HD 185418 * 19 38 27.4809937872 +17 15 26.048161044 7 7.639 7.485     B0.5V 129 0
40 HD 193322 ** 20 18 06.98820 +40 43 55.5001 5.17 5.94 5.84 5.69 5.68 O9IV(n)+B1.5V 272 0
41 HD 199579 SB* 20 56 34.7779063080 +44 55 29.000891928 5.16 6.01 5.96     O6.5V((f))z 357 0
42 * 68 Cyg SB* 21 18 27.1862219256 +43 56 45.399147864 4.05 4.99 5.00     O7.5IIIn((f)) 366 0
43 HD 206267 SB* 21 38 57.6195772032 +57 29 20.554016280 5.09 5.83 5.62   5.56 O6.0V((f))+O9:V 483 0
44 HD 207198 * 21 44 53.2791389640 +62 27 38.048647248 5.61 6.25 5.94 5.66 5.49 O8.5II 335 0
45 HD 209339 ** 22 00 39.2649125112 +62 29 16.063886004 5.9 8.73 8.51 7.61   O9.7IV 177 0
46 * 19 Cep * 22 05 08.7897533088 +62 16 47.332569936 4.36 5.19 5.11 4.95 4.92 O9Ib 371 0
47 * lam Cep s*b 22 11 30.5765111040 +59 24 52.154264880 4.55 5.29 5.05 4.77 4.62 O6.5I(n)fp 671 1

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2023.01.28-11:36:15

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