2008A&A...490..725G


Query : 2008A&A...490..725G

2008A&A...490..725G - Astronomy and Astrophysics, volume 490, 725-735 (2008/11-1)

SPITZER survey of dust grain processing in stable discs around binary post-AGB stars.

GIELEN C., VAN WINCKEL H., MIN M., WATERS L.B.F.M. and LLOYD EVANS T.

Abstract (from CDS):

We investigate the mineralogy and dust processing in the circumbinary discs of binary post-AGB stars using high-resolution TIMMI2 and SPITZER infrared spectra. We perform a full spectral fitting to the infrared spectra using the most recent opacities of amorphous and crystalline dust species. This allows for the identification of the carriers of the different emission bands. Our fits also constrain the physical properties of different dust species and grain sizes responsible for the observed emission features. In all stars the dust is oxygen-rich: amorphous and crystalline silicate dust species prevail and no features of a carbon-rich component can be found, the exception being EPLyr, where a mixed chemistry of both oxygen- and carbon-rich species is found. Our full spectral fitting indicates a high degree of dust grain processing. The mineralogy of our sample stars shows that the dust is constituted of irregularly shaped and relatively large grains, with typical grain sizes larger than 2µm. The spectra of nearly all stars show a high degree of crystallinity, where magnesium-rich end members of olivine and pyroxene silicates dominate. Other dust features of e.g. silica or alumina are not present at detectable levels. Temperature estimates from our fitting routine show that a significant fraction of grains must be cool, significantly cooler than the glass temperature. This shows that radial mixing is very efficient is these discs and/or indicates different thermal conditions at grain formation. Our results show that strong grain processing is not limited to young stellar objects and that the physical processes occurring in the discs are very similar to those in protoplanetary discs.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: evolution - stars: binaries: general - stars: circumstellar matter

Errata: +corrigendum vol. 515, p. C2 (2010)

Simbad objects: 27

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Number of rows : 27
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 V* TW Cam pA* 04 20 47.6363454312 +57 26 28.522779504 12.12 11.42 10.08 9.29   G8Ib 69 0
2 V* AY Lep pA* 05 22 59.4229189104 -20 32 53.048251464   10.52 9.48     ~ 29 0
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16530 1
4 * 17 Lep Sy* 06 04 59.1294521328 -16 29 03.969238632 5.29 5.17 4.93     A3+K/M 207 0
5 V* SU Gem Mi* 06 14 00.0252211992 +27 42 12.186889416   11.70 10.19 11.92   F8/G0Ib 51 0
6 V* UY CMa RV* 06 18 16.3755429480 -17 02 34.676976156   11.55 10.80     G0V 41 0
7 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 745 0
8 V* ST Pup pA* 06 48 56.4136156056 -37 16 33.338192304   10.47 9.28 9.89 9.29 G2I 89 0
9 V* PS Gem pA* 07 03 39.6305052432 +10 46 13.068774048   7.76 7.37     A0 113 0
10 V* V421 CMa pA* 07 16 08.2750036896 -23 27 01.536458868   11.16 10.73     F5 29 0
11 V* BZ Pyx pA* 09 08 10.1394900720 -28 19 10.396543512   12.04 11.39     F6Ia 16 0
12 IRAS 09144-4933 pA* 09 16 09.6356114088 -49 46 12.098975844     11.1     M4/S? 19 0
13 V* V709 Car pA* 10 19 16.8824970456 -57 19 25.875376392   12.71 11.28     G8Ia-0 16 0
14 HD 100546 Be* 11 33 25.4408872296 -70 11 41.241297948   6.71 6.30   6.64 A0VaekB8_lB 746 1
15 V* RU Cen pA* 12 09 23.8148403768 -45 25 34.801333356   9.81 8.70     G1Ie 92 1
16 V* SX Cen RV* 12 21 12.5736554208 -49 12 41.058679536   10.11 9.60     B5III 68 0
17 V* EN TrA pA* 14 57 00.6850828200 -68 50 22.897081716   9.42 8.70     F2Ib 70 0
18 V* V1333 Sco pA* 16 26 20.3836477344 -34 17 12.911443404   12.38 11.41     F8 19 0
19 CD-48 11445 pA* 17 07 36.6587101920 -48 19 08.477155920   12.33 10.55     G2p(R) 30 0
20 V* LR Sco RV* 17 27 53.6271514344 -43 50 46.291360596   11.45 10.37     G0I 32 0
21 V* AC Her RV* 18 30 16.2373118976 +21 52 00.599340000 8.00 7.79 7.01     F4Ibp 327 0
22 BD+03 3950 RV* 19 15 01.1800830552 +03 48 42.641057988   11.16 10.37     F8 37 0
23 V* EP Lyr RV* 19 18 19.5570243336 +27 51 03.082292928   11.22 9.96 10.14   G2II 86 1
24 BD-02 4931 pA* 19 18 22.7165647344 -02 42 10.880466588   11.55 10.78     B1III 32 0
25 V* QY Sge LP* 20 07 54.6224115384 +18 42 54.538913232   12.57       G0Ie 52 0
26 V* V1610 Cyg pA* 21 02 18.27 +36 41 37.0           F5Iae 862 1
27 V* HM Aqr pA* 22 35 27.5260668720 -17 15 26.894587392 9.31 9.08 8.90     A0III 105 0

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2023.02.08-02:29:19

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