1997A&A...326.1215C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST03:05:39

1997A&A...326.1215C - Astronomy and Astrophysics, volume 326, 1215-1227 (1997/10-3)

Physical association between the Southern Coalsack and the Chamaeleon-Musca dark clouds.

CORRADI W.J.B., FRANCO G.A.P. and KNUDE J.

Abstract (from CDS):

The results of a photometric programme aiming to investigate the hypothesis of a physical association between the Southern Coalsack and the Chamaeleon-Musca dark clouds are presented. The analysis is based upon uvbyβ photometry for 1017 stars selected from the Smithsonian Astrophysical Observatory star catalog to cover these clouds and the connecting area defined by the galactic coordinates: 308°≥l≥294° and -20°≤b≤5°. To ensure a more complete sample the data were complemented by uvbyβ photometry for 213 stars of Kapteyn's Selected Area 203, that lies at the center of the Chamaeleon-Musca dark clouds complex. The distribution of the colour excesses E(b-y) for stars with line-of-sight inside and outside the dark clouds' contours indicates the presence of a local low absorption volume that is limited at 150±30pc from the Sun by an extended interstellar dust feature, and is followed by another region with almost no additional reddening for another 350pc. Combined with other data on the local ISM, the existence of the dust feature permeating the whole connecting area and the identical distance of the Southern Coalsack and Chamaeleon-Musca dark clouds suggest that these clouds could be dense condensations in the diffuse medium composing the interface of the Local and Loop I Bubbles. Apparently, the minimum column density of the dust feature does not show a clear dependence with the galactic longitude, but may increase with the galactic latitude in the sense that [E(b-y)min, b]=[0.050mag; 0°]->[0.100mag; -8°]->[0.150mag; -15°]. The quoted increase suggests either the approaching of the tangential point of a warped sheet-like structure of same column density and curved away from the Sun, or an inhomogeneous sheet-like structure roughly perpendicular to the galactic plane.

Abstract Copyright:

Journal keyword(s): stars: distances - ISM: clouds - ISM: individual objects: Southern Coalsack - Chamaeleon-Musca (Cha-Mus) - Loop I - Local Bubble

Simbad objects: 17

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Number of rows : 17

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 NAME Cha I MoC 11 06 48 -77 18.0           ~ 968 1
2 HD 97300 Ae* 11 09 50.0178181814 -76 36 47.711452436   9.41 9.20   8.82 B9V 157 1
3 NAME Cha Dark Cloud SFR 11 55 -78.0           ~ 557 1
4 NAME Cha-Mus DNe 12 15 -76.7           ~ 25 0
5 NAME Musca Cld 12 23 -71.3           ~ 156 0
6 NAME Coalsack Nebula DNe 12 31 19 -63 44.6           ~ 242 0
7 IRAS 12340-7958 * 12 37 39.7466355997 -80 15 13.713429632   16.11 14.39 13.63 9.81 ~ 101 0
8 NAME Cha III MoC 12 37.8 -80 15           ~ 124 2
9 NAME Cha II MoC 12 54 -77.2           ~ 296 0
10 NAME Loop I SR? 15 01 -38.7           ~ 328 2
11 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1207 1
12 DCld 317.0-04.1 DNe 15 02 37 -63 21.1           ~ 17 0
13 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 608 2
14 V* R CrA Ae* 19 01 53.6850227874 -36 57 08.145519972 12.781 12.651 11.917 11.242 10.412 B5IIIpe 449 1
15 NAME Local Bubble ISM ~ ~           ~ 693 0
16 SA 194- As* ~ ~           ~ 2 0
17 SA 203- * ~ ~           ~ 4 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-03:05:39

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