2002A&A...389..547H


Query : 2002A&A...389..547H

2002A&A...389..547H - Astronomy and Astrophysics, volume 389, 547-555 (2002/7-2)

The circumstellar dust shell of the post-AGB star HD 161796.

HOOGZAAD S.N., MOLSTER F.J., DOMINIK C., WATERS L.B.F.M., BARLOW M.J. and DE KOTER A.

Abstract (from CDS):

We have modeled the complete optical to millimeter spectrum of the Post-Asymptotic Giant Branch (Post-AGB) star HD 161796 and its circumstellar dust shell. A full 2-200µm spectrum taken with the Infrared Space Observatory was used to constrain the dust properties. A good fit is achieved using only 4 dust components: amorphous silicates, the crystalline silicates forsterite and enstatite, and crystalline water ice, contributing respectively about 63, 4, 6 and 27% to the total dust mass. The different dust species were assumed to be co-spatial but distinct, resulting in different temperatures for the different grain populations. We find a temperature for the crystalline H2O ice of 70K, which is higher than thermal equilibrium calculations of pure H2O ice would give. This implies that the ice must be formed as a mantle on top of an (amorphous) silicate core. In order to form H2O ice mantles the mass loss rate must exceed some 5x10–5M/yr. With a water-ice fraction of 27% a lower limit for the gas to dust mass ratio of 270 is found. At a distance of 1.2kpc (Skinner et al., 1994ApJ...423L.135S) and adopting an outflow velocity of 15km/s (Likkel et al., 1991A&A...246..153L) an AGB mass loss rate of (5.1x10–4M/yr) is found, which lasted 900 years and ended 430 years ago. During this phase a total of 0.46M was expelled. The mass loss rate was high enough to account for the presence of the H2O ice.

Abstract Copyright:

Journal keyword(s): stars: circumstellar matter, AGB and post-AGB - stars: individual: HD 161796 - infrared: ISM - ISM: lines and bands

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 - 2022
#notes
1 HD 161796 pA* 17 44 55.4694563472 +50 02 39.482823336 8.00 7.68 7.21 6.77 6.51 F3Ib 316 0

Query : 2002A&A...389..547H

Basic data :
HD 161796 -- Post-AGB Star (proto-PN)
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:
* (HD,AG,...), IR (AKARI,GLMP,...), V* (V*,AAVSO), pA* (2007A&A), LP* (2009yCat)
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) :
17 44 55.4694563472 +50 02 39.482823336 (Optical) [ 0.0217 0.0227 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) :
17 43 41.2797478865 +50 03 48.584001275 [ 0.0217 0.0227 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) :
077.1330807374179 +30.8695708846054 [ 0.0217 0.0227 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 :
-1.662 -11.854 [0.029 0.026 90] A 2020yCat.1350....0G
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) -54.17 [1.78] / z(spectroscopic) -0.000181 [0.000006] / cz -54.17 [1.78]
   (Opt) B 2018yCat.1345....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):
0.5022 [0.0235] A 2020yCat.1350....0G
Spectral type is made of 3 parts: %coding is composed of 4 parts :
  • the spectral type, which is made of a temperature class, eventually a luminosity class (roman number) and/or spectral peculiarities;
  • a quality letter: A=best quality→E=worst quality, {� } =unknown quality %
  • a quality letter: A=best quality -> E=worst quality, {� } =unknown quality
  • bibcode : bibcode of the spectral type reference
Spectral type:
F3Ib C 1997BSAO...44....5K
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 (9) :
U 8.00 [~] C 2002yCat.2237....0D
B 7.68 [~] C 2002yCat.2237....0D
V 7.21 [~] C 2002yCat.2237....0D
R 6.77 [~] C 2002yCat.2237....0D
G 7.202188 [0.003559] C 2020yCat.1350....0G
I 6.51 [~] C 2002yCat.2237....0D
J 6.095 [0.019] C 2003yCat.2246....0C
H 5.979 [0.033] C 2003yCat.2246....0C
K 5.919 [0.017] C 2003yCat.2246....0C
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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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.
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Identifiers (33) :
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HD 161796 GSC2 N112001124 RAFGL 5384 YZ 50 5340
** TDT 485 GSC 03518-00402 SAO 30548 [LFO93] 1743+50
AG+50 1248 HIC 86869 SKY# 32088 AAVSO 1742+50
AKARI-IRC-V1 J1744554+500239 HIP 86869 TIC 316493106 Gaia EDR3 1367102319545324288
BD+50 2457 IRAS 17436+5003 uvby98 100161796 Gaia DR1 1367102315248484864
GC 24113 IRAS F17436+5003 V* V814 Her Gaia DR2 1367102319545324288
GCRV 67383 2MASS J17445547+5002394 WDS J17449+5003AB
GEN# +1.00161796 PN G077.1+30.8 WISEA J174455.45+500239.5
GLMP 639 PPM 36153 WISE J174455.45+500239.6

References (316 between 1850 and 2022) (Total 316)
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 : 3    V* : 1    distance : 1    Fe_H : 7    PLX : 3    PM : 6    MK : 6   

   

Observing logs


herschel : 14    ISO : 17    IUE : 3   

   


External archives :

Data at NED - NASA/IPAC Extragalactic Database : HD 161796

Link by name to the catalogue in VizieR :

HD 161796 AG+50 1248 AKARI-IRC-V1 J1744554+500239 BD+50 2457 GLMP 639
GSC 03518-00402 HIC 86869 HIP 86869 IRAS 17436+5003 IRAS F17436+5003
2MASS J17445547+5002394 PN G077.1+30.8 PPM 36153 RAFGL 5384 SAO 30548
uvby98 100161796 V* V814 Her WDS J17449+5003AB WISEA J174455.45+500239.5 WISE J174455.45+500239.6
Gaia EDR3 1367102319545324288 Gaia DR1 1367102315248484864 Gaia DR2 1367102319545324288

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2022.05.23-10:20:08

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