2003ApJ...595..858L


Query : 2003ApJ...595..858L

2003ApJ...595..858L - Astrophys. J., 595, 858-879 (2003/October-1)

Far Ultraviolet Spectroscopic Explorer survey of the local interstellar medium within 200 parsecs.

LEHNER N., JENKINS E.B., GRY C., MOOS H.W., CHAYER P. and LACOUR S.

Abstract (from CDS):

We present Far Ultraviolet Spectroscopic Explorer observations of the interstellar gas toward 30 white dwarf stars and one subdwarf (SdO) star. These sight lines probe the Local Bubble (LB) and the local interstellar medium (LISM) near the LB. We systematically measure the column densities for the following species: C II, C II*, C III, N I, N II, O I, Ar I, Si II, P II, Fe II, Fe III, and H2. Our survey detected only diffuse H2molecular clouds (fH2≲10–4) along six sight lines. There is no evidence from this study that H2exists well inside the perimeter of the LB. The kinematical temperature for H2is less than the usual temperature observed in the local interstellar clouds, implying different gas phases in the LISM. The relative abundance ratios of Si II, P II, and Fe II give insight about the dust content. These ratios vary but are similar to the depletion patterns observed in warm and halo diffuse clouds in more distant sight lines in the Galaxy. The N I/O I and Ar I/O I ratios are significantly subsolar within the LB. Outside the LB a larger scatter is observed from subsolar to solar. Because Ar and N are only weakly depleted into dust grains if at all, the deficiencies of their neutral forms are likely due to photoionization. The evidence for significant ionization of N (and hence Ar) is strengthened by the detection and measurement of N II, which is a dominant ion for this element toward many sight lines. C III appears to be ubiquitous in the LISM toward our sight lines, but C II remains the dominant ionization stage of C. The limits on Fe III/Fe II imply that Fe II is the dominant ion. These observations imply that photoionization is the main ionization mechanism in the LISM and do not support the existence of a highly ionized condition in the past. In view of the variations observed in the different atomic and ionic ratios, the photoionization conditions vary significantly in the LB and the LISM. The cooling rate in the LISM, lc[in ergs/s (H I atom)–1], derived from the emission of the C II 157.7 µm line has a mean value of loglc=-25.59±0.32 dex, very similar to previous determinations.

Abstract Copyright:

Journal keyword(s): ISM: Abundances - ISM: Atoms - ISM: Clouds - ISM: Structure - Ultraviolet: ISM - Stars: White Dwarfs

Simbad objects: 45

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Number of rows : 45
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 GD 2 WD* 00 07 32.2596160176 +33 17 27.605949792 12.321 13.482 13.791 13.940 14.119 DA1.0 93 0
2 GD 659 WD* 00 53 17.4282107064 -32 59 56.523062760   13.14 13.36     DA1.4 129 0
3 GD 984 ** 01 34 24.0732015168 -16 07 08.095946556   13.6 13.98 14.3   DA1+dM 68 0
4 MBM 12 MoC 02 56 50 +19 32.0           ~ 218 1
5 MBM 16 MoC 03 19 04.1 +11 34 52           ~ 62 0
6 FBS 0421+740 WD* 04 27 33.5227648032 +74 07 31.546270452   15.17 15.46 15.80   DA.9 31 0
7 NAME LIC Cld 04 41 +31.           ~ 277 0
8 SH 2-216 PN 04 43 21.2638228056 +46 42 05.835192876   12.50 12.87 13.04   DAO.6 157 2
9 RX J0457.2-2807 WD* 04 57 13.3208333976 -28 07 52.750783812 12.44 13.65 13.92 14.23   DA.8 109 0
10 BD+52 913 WD* 05 05 30.6180977592 +52 49 51.919301604 10.25 11.44 11.69 11.93 12.108 DA.8 1052 0
11 * alf Aur SB* 05 16 41.35871 +45 59 52.7693 1.33 0.88 0.08 -0.52 -0.96 G3III: 1164 0
12 GD 71 WD* 05 52 27.6198591816 +15 53 13.228887444 11.675 12.783 13.032 13.169 13.337 DA1.5 366 0
13 * bet CMa bC* 06 22 41.9853527 -17 57 21.307352 0.77 1.73 1.97 2.11 2.35 B1II-III 702 0
14 RX J0623.2-3741 WD* 06 23 12.6177525552 -37 41 28.043049264   11.88 12.42 12.6   DA.8 101 0
15 * eps CMa * 06 58 37.54876 -28 58 19.5102 0.36 1.29 1.50 1.59 1.80 B1.5II 477 0
16 RX J0715.3-7025 WD* 07 15 16.5785943888 -70 25 05.616247620   13.97 14.178 14.12   DA1 51 0
17 HE 1017-1352 WD* 10 19 52.3625938032 -14 07 34.251584988   14.37 14.58 14.8   DA1.6 41 0
18 Feige 55 WD* 12 04 38.5359546168 +60 32 08.086967232 11.974 13.224 13.568 13.717 13.896 DAO.9 76 0
19 HZ 21 WD* 12 13 56.2641545952 +32 56 31.358609412 13.125 14.361 14.688 14.837 15.038 DO1 138 0
20 PG 1234+482 WD* 12 36 45.1436139768 +47 55 22.218366900     14.38     DA.9 91 2
21 GD 153 WD* 12 57 02.3224909560 +22 01 52.634778240 11.883 13.060 13.349 13.488 13.669 DA1.2 340 0
22 HZ 43A WD* 13 16 21.8529879473 +29 05 55.413524767   12.52 12.66     DAwk 462 0
23 RE J152943+483625 WD* 15 29 43.1094897048 +48 36 24.012456876     14.5     DA1.0 27 0
24 EGGR 118 WD* 16 17 55.2411185208 -15 35 52.154367684 12.086 13.215 13.425 13.558 13.714 DA1.7 90 0
25 RX J1629.0+7804 WD* 16 29 10.278576 +78 04 39.91620   12.74 12.95 13.03   DA1.2 85 0
26 PG 1636+351 WD* 16 38 26.3184985560 +35 00 11.890614960 13.585 14.65 14.902 15.013 15.157 DA1.4 77 0
27 HD 149499B WD* 16 38 31.199 -57 28 10.70   11.12 11.26     DOZ1 102 0
28 LB 335 WD* 17 26 43.3815449232 +58 37 32.146498308   15.36 13.44     DA.9 58 0
29 KUV 18004+6836 WD* 18 00 09.6182434536 +68 35 52.226787048   14.68 14.69 15.00   DA1.1 58 0
30 RX J1820.5+5805 WD* 18 20 29.7868783008 +58 04 40.963525860   13.8 14.23     DA1.0 38 0
31 KUV 18453+6819 WD* 18 45 09.3271391712 +68 22 34.865250132   15.24 15.00 15.65   DA1.4 39 0
32 RX J1847.9-2219 WD* 18 47 56.5242646248 -22 19 37.774445232   14.5 14.0 14.4   DA1.5 41 0
33 RE J1943+500 WD* 19 43 43.6811875272 +50 04 37.921728648     14.8     DA1.4 45 0
34 RX J2009.1-6025 WD* 20 09 05.6036730480 -60 25 42.533556924 11.94 13.11 13.39 13.69   DA1.2 61 0
35 RX J2013.1+4002 ** 20 13 09.3685663800 +40 02 24.241439184     14.6     DAO+M2/3e 89 1
36 GD 394 WD* 21 12 44.0371201584 +50 06 17.887239540 11.70 12.85 13.09     DA1.3 172 1
37 BPS CS 29506-0051 WD* 21 27 43.1222833584 -22 11 48.681876912 13.53 14.72 14.94     DA1.0 45 0
38 BD+28 4211 HS* 21 51 11.0221915656 +28 51 50.367627468 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 773 0
39 RX J2156.4-5438 WD* 21 56 21.2576687736 -54 38 23.017341192 13.11 14.29 14.58     DA1 55 0
40 RX J2214.1-4918 WD* 22 14 11.9175658032 -49 19 27.216388524   11.28 11.57 11.7   DA.7 112 0
41 Lan 23 WD* 22 49 52.3672810920 +58 34 32.038383144 12.80 13.98 14.19 14.78   DA.9 40 0
42 GD 246 WD* 23 12 21.6158334024 +10 47 04.257295476 11.578 12.772 13.090 13.238 13.418 DA.9 208 0
43 Feige 110 HS* 23 19 58.3996844256 -05 09 56.171142864 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 605 1
44 LB 1526 WD* 23 34 02.1937634480 -47 14 26.650283705   13.13 13.46     DA.9 72 0
45 NAME Local Bubble ISM ~ ~           ~ 813 0

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2022.11.26-09:53:01

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