2008A&A...491...53S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.09CEST16:16:55

2008A&A...491...53S - Astronomy and Astrophysics, volume 491, 53-68 (2008/11-3)

The boundary conditions of the heliosphere: photoionization models constrained by interstellar and in situ data.

SLAVIN J.D. and FRISCH P.C.

Abstract (from CDS):

The boundary conditions of the heliosphere are set by the ionization, density, and composition of inflowing interstellar matter. Our aim is to constrain the properties of the Local Interstellar Cloud (LIC) at the heliosphere, which requires radiative transfer ionization models. We modeled the background interstellar radiation field using observed stellar FUV and EUV emission and the diffuse soft X-ray background. We also modeled the emission from the boundary between the LIC and the hot Local Bubble plasma, assuming that the cloud is evaporating because of thermal conduction. We created a grid of models covering a plausible range of LIC and Local Bubble properties, and used the modeled radiation field as input to radiative transfer/thermal equilibrium calculations using the Cloudy code. Data from in situ observations of He0, pickup ions and anomalous cosmic rays in the heliosphere, as well as from absorption line measurements towards ε CMa were used to constrain the input parameters. A restricted range of assumed LIC HI column densities and Local Bubble plasma temperatures produced models that match all the observational constraints. The relative weakness of the constraints on N(HI) and Th contrast with the narrow limits predicted for the H0 and electron density in the LIC at the Sun, n(H0)=0.19-0.20cm–3 and ne=0.07±0.01cm–3. Derived abundances are mostly typical of low-density gas, with sub-solar Mg, Si, and Fe, possibly subsolar O and N, and S about solar; however, C is supersolar. The interstellar gas at the Sun is warm, low-density, and partially ionized, with n(H)≃0.23-0.27cm–3, T≃6300K, X(H+)∼0.2, and X(He+)∼0.4. These results appear to be robust since acceptable models are found for substantially different input radiation fields. Our results favor low values for the reference solar abundances for the LIC composition.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: abundances - ultraviolet: ISM - X-rays: diffuse background - solar system: general - ISM: cosmic rays

Simbad objects: 20

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Number of rows : 20

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 V* FS Cet WD* 02 35 07.5939678751 +03 43 56.817951540 11.027 12.209 12.412 12.325 11.968 DA1+dM 353 0
2 MBM 12 MoC 02 56 50 +19 32.0           ~ 211 1
3 NAME G Cloud Cld 03 00 +50.2           ~ 64 0
4 NAME LIC Cld 04 41 +31.           ~ 247 0
5 * alf Aur SB* 05 16 41.35871 +45 59 52.7693 1.33 0.88 0.08 -0.52 -0.96 G3III: 1137 0
6 M 42 HII 05 35 17.3 -05 23 28           ~ 3724 0
7 * bet CMa bC* 06 22 41.9853527 -17 57 21.307352 0.77 1.73 1.97 2.11 2.35 B1II-III 681 0
8 * alf CMa SB* 06 45 08.91728 -16 42 58.0171 -1.51 -1.46 -1.46 -1.46 -1.43 A1V+DA 1395 0
9 * eps CMa * 06 58 37.54876 -28 58 19.5102 0.36 1.29 1.50 1.59 1.80 B1.5II 460 1
10 HZ 43 ** 13 16 21.85329 +29 05 55.3793   12.52 12.66     DAwk+M3.5Ve 449 0
11 * eta UMa PM* 13 47 32.43776 +49 18 47.7602 0.99 1.67 1.86 1.98 2.16 B3V 579 0
12 * alf Cen ** 14 39 29.71993 -60 49 55.9990   0.4 -0.1     G2V+K1V 817 0
13 NAME Loop I SR? 15 01 -38.7           ~ 328 2
14 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1120 1
15 HD 149499B WD* 16 38 31.199 -57 28 10.70   11.12 11.26     DOZ1 100 0
16 * 36 Oph ** 17 15 20.9839376 -26 36 10.157115           K2V+K1V 116 0
17 * lam Sco bC* 17 33 36.52012 -37 06 13.7648 0.52 1.48 1.62     B2IV+DA7.9 374 1
18 V* V1341 Cyg LXB 21 44 41.1544523872 +38 19 17.065856122 15.00 15.13 14.68 15.00   A9III 1070 1
19 NAME Gould Belt PoG ~ ~           ~ 711 1
20 NAME Local Bubble ISM ~ ~           ~ 693 0

    Equat.    Gal    SGal    Ecl

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