2002A&A...384..585K


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET03:34:09

2002A&A...384..585K - Astronomy and Astrophysics, volume 384, 585-593 (2002/3-3)

Dust and the spectral energy distribution of the OH/IR star OH 127.8+0.0: Evidence for circumstellar metallic iron.

KEMPER F., DE KOTER A., WATERS L.B.F.M., BOUWMAN J. and TIELENS A.G.G.M.

Abstract (from CDS):

We present a fit to the spectral energy distribution of OH 127.8+0.0, a typical asymptotic giant branch star with an optically thick circumstellar dust shell. The fit to the dust spectrum is achieved using non-spherical grains consisting of metallic iron, amorphous and crystalline silicates and water ice. Previous similar attempts have not resulted in a satisfactory fit to the observed spectral energy distributions, mainly because of an apparent lack of opacity in the 3-8µm region of the spectrum. Non-spherical metallic iron grains provide an identification for the missing source of opacity in the near-infrared. Using the derived dust composition, we have calculated spectra for a range of mass-loss rates in order to perform a consistency check by comparison with other evolved stars. The L-[12µm] colours of these models correctly predict the mass-loss rate of a sample of AGB stars, strengthening our conclusion that the metallic iron grains dominate the near-infrared flux. We discuss a formation mechanism for non-spherical metallic iron grains.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - circumstellar matter - dust, extinction - radiative transfer - infrared: stars

CDS comments: in ref list FLUKS 1994A&AS.105.311 instead of A&A.105.311

Simbad objects: 10

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Number of rows : 10

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 IRC +10011 OH* 01 06 25.9889735162 +12 35 52.890666456   20.7   18.26 14.01 M8 405 0
2 OH 127.8 -0.0 OH* 01 33 51.21 +62 26 53.2           M9III 175 0
3 * omi Cet Mi* 02 19 20.79210 -02 58 39.4956   7.63 6.53 5.03   M5-9IIIe+DA 1456 0
4 V* VY CMa s*r 07 22 58.32877 -25 46 03.2355 12.01 10.19 7.95     M5Iae 1023 0
5 HD 161796 pA* 17 44 55.4696057799 +50 02 39.477383602 8.00 7.68 7.21 6.77 6.51 F3Ib 313 0
6 GAL 000.0+00.0 gam 17 45 39.60213 -29 00 22.0000           ~ 11999 0
7 RAFGL 2199 Mi* 18 35 46.8114216120 +05 35 50.500895964           O-rich 62 1
8 OH 26.5 +0.6 OH* 18 37 32.50920 -05 23 59.1936           ~ 286 0
9 OH 32.8 -0.3 OH* 18 52 22.25472 -00 14 11.8428           ~ 117 0
10 NSV 25875 OH* 22 19 27.48 +59 51 21.7           ~ 134 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-03:34:09

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