1999A&AS..137..323T


Query : 1999A&AS..137..323T

1999A&AS..137..323T - Astron. Astrophys., Suppl. Ser., 137, 323-336 (1999/June-1)

Dynamics of OH masers in regions of star formation I.

THISSEN T., SPIECKER H. and ANDRESEN P.

Abstract (from CDS):

A mathematical model for the explanation of OH masers in regions of star formation is presented. The model is based on the assumption that grains of different sizes are present at the border of the HII regions where they are exposed to the heat- and VUV-flux of a new born star. The grains evaporate water because of the heat flux from the central star. The subsequent dissociation of water by VUV together with IR relaxation generates a high OH abundance and yields strong inversion in the OH Λ-doublets for all maser transitions observed in star forming regions. The gain of the observed masers is determined as a function of the photodissociation rates for different evaporation rates. In this first approach IR pumping and collisions are neglected although they may change the quantitative predictions. The results show that gain may be high enough to explain all observed masers near new born stars under reasonable assumptions for the astrophysical conditions found at the border of HII regions. Based on the model predictions are made concerning intensities, locations and variability of the different maser transitions.

Abstract Copyright:

Journal keyword(s): ISM: OH - masers - hyperfine population - ISM: individual: W3(OH) - photodissociation - HII regions

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 - 2021
#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 968 2

Query : 1999A&AS..137..323T

Basic data :
NAME W 3 OH -- HII (ionized) region
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:
IR (IRAS,IRCO,...), Rad (GRS,W,...), HII (1996A&AS,[BNM96]), SFR (2016MNRAS), Cld ([RE69]), Mas (OH)
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) :
02 27 04.1 +61 52 22 [ ] D ~
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) :
02 23 16.7 +61 38 54 [ ]
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) :
133.9481 +01.0637 [ ]
Velocity of Local System : VSLR Vmin Vmax [error] (wavelength) bibcode
VLSR :
-46.4 -49.0 -43.8 [0.13] (Rad) 1996A&AS..115...81B
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!).
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Some important notes on this object about identifications and objects associations.
notes:


The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (13) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

NAME W 3 OH OH 133.9 +1.1 [BNM96] 133.943+1.059 [SD73] 10
GRS G133.90 +01.10 RAFGL 331 [KCW94] 133.947+01.064
IRAS 02232+6138 WB89 422 [LG97] B02232+6138
IRCO 3556 W 3(OH) [RE69] 022316.8+613854

References (968 between 1850 and 2021) (Total 968)
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


velocities : 5   

   

Observing logs


herschel : 37    ISO : 19   

   


External archives :

Data at NED - NASA/IPAC Extragalactic Database : NAME W 3 OH

Link by name to the catalogue in VizieR :

IRAS 02232+6138 RAFGL 331

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2021.09.20-06:38:48

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