CDS

1998A&AS..133..381P

Query : 1998A&AS..133..381P

1998A&AS..133..381P - Astron. Astrophys., Suppl. Ser., 133, 381-386 (1998/December-2)

The density and shock characteristics of NGC 2818.

PHILLIPS J.P. and CUESTA L.

Abstract (from CDS):

We report the results of narrow band imaging of the bipolar outflow source NGC 2818 in transitions of [NII], [OIII], [SII], and HI. As a consequence, we are able to assess the overall excitation properties of the shell, and determine that line ratios towards the nebular periphery are anomalous, and characteristic of planar shocks with velocity Vs≥110km/s. Pre-shock densities are likely to be modest, and of order 102<np<103cm–3. The [SII] imaging is further used to derive a fully-sampled map of electron density, whence it is clear that the density structure is rather complex and related to various features within the excitation maps. Peak values ne∼1.5x103cm–3 occur close to the nucleus, although densities subsequently decline for major axis displacements >7arcsec. The minor axis distribution, on the other hand, appears to be somewhat more extended and bilobal. It is probable that complexities in the density mapping reflect the presence of condensations and filaments within the primary shell structure, and that these are also responsible for apparent variations in density as a function of forbidden and permitted line transition.

Abstract Copyright: ∼

Journal keyword(s): planetary nebula: individual: NGC 2818 - ISM: jets and outflows

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 - 2023 		#notes
1 NGC 2818A PN 09 16 01.4901525600 -36 37 37.516376856           ~ 229 1

Query : 1998A&AS..133..381P

Basic data :
NGC 2818A -- Planetary Nebula
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types: 		PN (2013MNRAS,Hen,...), G (ESO,AM,...), IR (IRAS,PSCz), * (Gaia)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) : 		09 16 01.4901525600 -36 37 37.516376856 (Optical) [ 0.1364 0.1647 90 ] A 2020yCat.1350....0G
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) : 		09 14 00.3933329634 -36 25 04.096472807 [ 0.1364 0.1647 90 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) : 		261.9822043943216 +08.5840662204320 [ 0.1364 0.1647 90 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr : 		-3.712 4.940 [0.185 0.180 90] A 2020yCat.1350....0G
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas): 		0.0319 [0.2111] A 2020yCat.1350....0G
Syntax of angular size is : "maj-axis min-axis angle (wtype) quality bibcode"
  • maj-axis : major axis size (arc minutes)
  • min-axis : minor axis size (arc minutes)
  • angle : orientation angle (in degrees)
  • (wtype) : wavelength class for the origin of the angular size (Rad, mm, IR, Opt, UV, Xray, Gam)
  • quality : flag of quality of the angular size values ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the angular size reference
Angular size (arcmin): 		0.58591503 0.56252837 -81 (Rad) C 2021MNRAS.503.2887B
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (1) :
G 19.001705 [0.005500] C 2020yCat.1350....0G
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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within arcsec The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR.
The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!). sed-help-icon
Some important notes on this object about identifications and objects associations.
notes:

  • According to Sulenti et al. 1973, catalogue VII/1B/catalog in VizieR, NGC 2818 is the Open Cluster, while NGC 2818A is the Planetary Nebula. In the literature both objects are most commonly given the same name - NGC 2818 (see e.g. the abstract of 1972MNRAS.158...47T). The bibliography and data of both objects in SIMBAD have been cleaned in September 2022. Authors are invited to use the right identifier for each object in order to stop to spread this historical confusion.

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (20) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

ESO 372-13 NGC 2818A PN Hb 2 PSCz P09140-3625
AM 0914-362 PK 261+08 1 PN Sa 2-39 WRAY 16-38
Hen 2-23 PN G261.9+08.5 PN StWr 4-6 [M51] 45
IRAS 09140-3625 PN VV 51 PN VV' 88 Gaia DR2 5623380240906854656
LEDA 3098795 PN ARO 508 PN My 45 Gaia DR3 5623380240906854656

References (229 between 1850 and 2023) (Total 229)
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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Collections of Measurements


distance : 2    PLX : 2    PM : 2   

   

Observing logs


IUE : 3   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : NGC 2818A

Link by name to the catalogue in VizieR :

IRAS 09140-3625 PN G261.9+08.5 Gaia DR2 5623380240906854656 Gaia DR3 5623380240906854656

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Annotations :
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Please, have a look at Best practices. The list of all annotations to SIMBAD objects can be found here .

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2023.06.07-08:30:41

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