2014A&A...567A..58G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST04:34:33

2014A&A...567A..58G - Astronomy and Astrophysics, volume 567A, 58-58 (2014/7-1)

The interstellar cloud surrounding the Sun: a new perspective.

GRY C. and JENKINS E.B.

Abstract (from CDS):

We offer a new, simpler picture of the local interstellar medium, made of a single continuous cloud enveloping the Sun. This new outlook enables the description of a diffuse cloud from within and brings to light some unexpected properties. We re-examine the kinematics and abundances of the local interstellar gas, as revealed by the published results for the ultraviolet absorption lines of MgII, FeII, and HI. In contrast to previous representations, our new picture of the local interstellar medium consists of a single, monolithic cloud that surrounds the Sun in all directions and accounts for most of the matter present in the first 50 parsecs around the Sun. The cloud fills the space around us out to about 9pc in most directions, although its boundary is very irregular with possibly a few extensions up to 20pc. The cloud does not behave like a rigid body: gas within the cloud is being differentially decelerated in the direction of motion, and the cloud is expanding in directions perpendicular to this flow, much like a squashed balloon. Average H I volume densities inside the cloud vary between 0.03 and 0.1/cm3 over different directions. Metals appear to be significantly depleted onto grains, and there is a steady increase in depletion from the rear of the cloud to the apex of motion. There is no evidence that changes in the ionizing radiation influence the apparent abundances. Secondary absorption components are detected in 60% of the sight lines. Almost all of them appear to be interior to the volume occupied by the main cloud. Half of the sight lines exhibit a secondary component moving at about -7.2km/s with respect to the main component, which may be the signature of a shock propagating toward the cloud's interior.

Abstract Copyright:

Journal keyword(s): ISM: structure - ISM: kinematics and dynamics - ISM: abundances - ISM: individual objects: Local Cloud - ISM: clouds

Simbad objects: 25

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Number of rows : 25

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 NAME G Cloud Cld 03 00 +50.2           ~ 64 0
3 * eps Eri BY* 03 32 55.8449634 -09 27 29.731165 5.19 4.61 3.73 3.00 2.54 K2V 1697 1
4 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2654 0
5 * alf Tau LP? 04 35 55.23907 +16 30 33.4885 4.32 2.40 0.86 -0.37 -1.31 K5+III 1178 1
6 NAME LIC Cld 04 41 +31.           ~ 247 0
7 BD+52 913 WD* 05 05 30.6182785658 +52 49 51.920797126 10.25 11.44 11.69 11.93 12.108 DA.8 983 0
8 * 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
9 * 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
10 * eps CMa * 06 58 37.54876 -28 58 19.5102 0.36 1.29 1.50 1.59 1.80 B1.5II 460 1
11 * gam Cru PM* 12 31 09.95961 -57 06 47.5684 5.01 3.23 1.64 -0.02 -1.44 M3.5III 264 0
12 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1020 0
13 HZ 43 ** 13 16 21.85329 +29 05 55.3793   12.52 12.66     DAwk+M3.5Ve 449 0
14 * alf Cen ** 14 39 29.71993 -60 49 55.9990   0.4 -0.1     G2V+K1V 817 0
15 * ksi Boo BY* 14 51 23.37993 +19 06 01.6994 5.618 5.370 4.593 3.91 3.48 G7Ve+K5Ve 433 0
16 NAME Loop I SR? 15 01 -38.7           ~ 328 2
17 * 36 Oph ** 17 15 20.9839376 -26 36 10.157115           K2V+K1V 116 0
18 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11535 0
19 V* AU Mic BY* 20 45 09.5323695486 -31 20 27.241710746   10.05 8.627 9.078 6.593 M1VeBa1 893 0
20 * 61 Cyg A BY* 21 06 53.9396100677 +38 44 57.897024357 7.50 6.39 5.21 4.19 3.54 K5V 945 0
21 * iot Cap BY* 21 22 14.7956478 -16 50 04.359799 5.74 5.18 4.27 3.65 3.17 G7IIIFe-1.5 179 0
22 * ups Peg PM* 23 25 22.7835046 +23 24 14.760593 5.15 5.01 4.40 3.86 3.54 F8III 239 0
23 NAME Local Bubble ISM ~ ~           ~ 693 0
24 NAME Hyades Cloud Cld ~ ~           ~ 23 0
25 NAME CLIC ? ~ ~           ~ 7 1

    Equat.    Gal    SGal    Ecl

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2020.07.08-04:34:33

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