1996A&A...315L.361W

Query : 1996A&A...315L.361W

1996A&A...315L.361W - Astronomy and Astrophysics, volume 315, L361-364 (1996/11-2)

Mineralogy of oxygen-rich dust shells.

WATERS L.B.F.M., MOLSTER F.J., DE JONG T., BEINTEMA D.A., WAELKENS C., BOOGERT A.C.A., BOXHOORN D.R., DE GRAAUW T., DRAPATZ S., FEUCHTGRUBER H., GENZEL R., HELMICH F.P., HERAS A.M., HUYGEN R., IZUMIURA H., JUSTTANONT K., KESTER D.J.M., KUNZE D., LAHUIS F., LAMERS H.J.G.L.M., LEECH K.J., LOUP C., LUTZ D., MORRIS P.W., PRICE S.D., ROELFSEMA P.R., SALAMA A., SCHAEIDT S.G., TIELENS A.G.G.M., TRAMS N.R., VALENTIJN E.A., VANDENBUSSCHE B., VAN DEN ANCKER M.E., VAN DISHOECK E.F., VAN WINCKEL H., WESSELIUS P.R. and YOUNG E.T.

Abstract (from CDS):

Spectra taken with the Short Wavelength Spectrometer on board of the Infrared Space Observatory of dust shells around evolved oxygen-rich stars reveal the presence of several emission features at wavelengths between 20 and 45µm. These features have a range of widths and strengths, but are all narrow compared to the well-known amorphous silicate bands at 9.7 and 18µm. The emission peaks are tentatively identified with crystalline forms of silicates such as pyroxenes and olivine. The emission features tend to be more prominent for objects with cooler dust shells (T<300K). This may be due to an intrinsic change in optical properties of the dust as it cools, or it may be due to an increase in the fraction of crystalline silicates compared to amorphous forms as the mass loss rate increases. The implications for the physics of dust formation in the outflows of cool giants are briefly discussed.

Abstract Copyright: ∼

Journal keyword(s): infrared: stars - stars: AGB and post-AGB - mass loss - planetary nebulae - dust

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 HD 302821 sg* 10 23 19.4847405144 -59 32 04.566918624   10.59 9.17     A7Ie 81 1
2 V* W Hya Mi* 13 49 02.0018313132 -28 22 03.532006894   8.97 7.70     M7.5-9e 640 0
3 NGC 6302 PN 17 13 44.5 -37 06 11           O-rich 795 1
4 NGC 6543 PN 17 58 33.4039587288 +66 37 58.750734000   11.09 11.28     [WC] 1170 1
5 HD 179821 pA* 19 13 58.6082398776 +00 07 31.935181836 10.81 9.694 8.19     G4_0-Ia 239 0
6 NML Cyg s*r 20 46 25.5392819088 +40 06 59.464289232           M7/8 508 0

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