2002MNRAS.331..693W

Query : 2002MNRAS.331..693W

2002MNRAS.331..693W - Mon. Not. R. Astron. Soc., 331, 693-706 (2002/April-2)

On the instability of D-type ionization fronts.

WILLIAMS R.J.R.

Abstract (from CDS):

We investigate the stability of D-type ionization fronts (IF). We find the dispersion relation for surface modes of weak-D IF illuminated by a plane-parallel radiation field, including both the inclination of the IF to the ionizing radiation field and the effects of recombination in the ionized gas. It is well known that IF are unstable in the absence of recombination in the ionized gas, but that recombination tends to stabilize them. For finite inclination, however, IF are unstable at essentially all wavelengths in the limit of very cold upstream gas.

We present numerical hydrodynamic simulations of the development of the instabilities. These confirm the presence of long-wavelength instabilities of IF when the sound speed in the neutral gas is a finite fraction of that in the ionized gas and the ionization cross section is finite. They also show the development of the instabilities to non-linear amplitude.

Abstract Copyright: 2002 Blackwell Science Ltd

Journal keyword(s): Hii regions - ISM: kinematics and dynamics

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	M 16	OpC	18 18 45.1	-13 47 31						~	1084	1

Query : 2002MNRAS.331..693W

Basic data :

M 16 -- Open Cluster
Other object types:	`OpC (2013A&A,OCISM,...)`, `Cl* (2020A&A,C,...)`, `Rad (CTB,GRS,...)`, `Cl? (2013A&A)`, `HII (LBN)`
ICRS coord. (ep=J2000) :	`18 18 45.1 -13 47 31 (Optical) [ ] E 2021A&A...647A..19T`
FK4 coord. (ep=B1950 eq=1950) :	`18 15 55.0 -13 48 47 [ ]`
Gal coord. (ep=J2000) :	`016.9615 +00.8106 [ ]`
Proper motions mas/yr :	`0.178 -1.576 [0.014 0.018 90] C` `2020A&A...633A..99C`
Radial velocity / Redshift / cz :	`V(km/s) 18.00 [0.58] / z(~) 0.000060 [0.000002] / cz 18.00 [0.58] (Opt) A 2017AstBu..72..257L`
Parallaxes (mas):	`0.566 [0.006] C` `2020A&A...633A..99C`
Angular size (arcmin):	`80.0 80.0 0 (~) C` `2022A&A...664A..66M`

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`M 16`	`LBN 016.96+00.78`	`NAME Star Queen`	`Villafranca O-019`
`C 1816-138`	`LBN 67`	`NGC 6611`	`[KPR2004b] 441`
`CTB 51`	`LMH 22`	`NRL 14`	`[KPS2012] MWSC 2886`
`GRS G017.00 +00.30`	`MM 21`	`OCISM 10`
`IC 4703`	`NAME Eagle Nebula`	`OCl 54`

References (1084 between 1850 and 2026) (Total 1084)
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 : M 16

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NGC 6611

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