1998A&A...338..723J

Query : 1998A&A...338..723J

1998A&A...338..723J - Astronomy and Astrophysics, volume 338723-728 (1998/10-2)

Interstellar extinction and its relation to the three-dimensional cloud structure.

JUVELA M.

Abstract (from CDS):

We present simulated extinction measurements using different three-dimensional models for the density structure of interstellar clouds. The distribution of the extinction values and the properties of the dispersion observed at small scales are studied. The results are compared with previous observations of real clouds. Our results show that the observed small scale extinction variations are very effective in limiting the free parameters of the cloud models. On the other hand, all the tested models (i.e. fractal and structure-tree models) were able to reproduce the observed extinction variations with some parameter values. This was found to be true even for a model consisting of randomly placed clumps of constant density. The extinction measurements can, however, be used to get crude estimates of the volume filling factor of the clouds. Comparison between the models and the observations of the cloud IC 5146 (Lada et al. 1994) indicates a volume filling factor in the range 0.1-0.2.

Abstract Copyright: ∼

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

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	IC 5146	OpC	21 53 29.3	+47 14 46						~	507	2

Query : 1998A&A...338..723J

Basic data :

IC 5146 -- Open Cluster
Other object types:	`OpC (2013A&A,OCISM,...)`, `Cl* (2020A&A,C,...)`, `As* (2019AJ,[KC2019])`, `HII (LBN)`, `* (IC)`, `ISM (Min)`
ICRS coord. (ep=J2000) :	`21 53 29.3 +47 14 46 (Optical) [ ] E 2021A&A...647A..19T`
FK4 coord. (ep=B1950 eq=1950) :	`21 51 33.5 +47 00 35 [ ]`
Gal coord. (ep=J2000) :	`094.3820 -05.5204 [ ]`
Proper motions mas/yr :	`-2.910 -2.490 [0.037 0.037 90] C` `2020A&A...633A..99C`
Radial velocity / Redshift / cz :	`V(km/s) -5.48 [0.25] / z(spectroscopic) -0.000018 [0.000001] / cz -5.48 [0.25] (NIR) A 2019A&A...623A..80C`
Parallaxes (mas):	`1.213 [0.013] C` `2020A&A...633A..99C`
Angular size (arcmin):	`8.2 8.2 0 (Opt) D` `2020A&A...633A..99C`

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`IC 5146`	`LBN 424`	`NAME Cocoon Nebula`	`OCl 213.0`
`C 2151+470`	`LBN 094.43-05.58`	`OCISM 43`	`[KC2019] Theia 88`
`Cl Collinder 470`	`Min 2-70`	`OCl 213`	`[KPS2012] MWSC 3571`

References (507 between 1850 and 2026) (Total 507)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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Data at NED - NASA/IPAC Extragalactic Database : IC 5146

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