1998A&A...331L..61W


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST02:54:55

1998A&A...331L..61W - Astronomy and Astrophysics, volume 331, L61-64 (1998/3-3)

Crystalline silicates in planetary nebulae with [WC] central stars.

WATERS L.B.F.M., BEINTEMA D.A., ZIJLSTRA A.A., DE KOTER A., MOLSTER F.J., BOUWMAN J., DE JONG T., POTTASCH S.R. and DE GRAAUW T.

Abstract (from CDS):

We present ISO-SWS spectroscopy of the cool dusty envelopes surrounding two Planetary Nebulae with [WC] central stars, BD+30 3639 and He 2-113. The λ<15µm region is dominated by a rising continuum with prominent emission from C-rich dust (PAHs), while the long wavelength part shows narrow solid state features from crystalline silicates. This demonstrates that the chemical composition of both stars changed very recently (less than 1000 years ago). The most likely explanation is a thermal pulse at the very end of the AGB or shortly after the AGB. The H-rich nature of the C-rich dust suggests that the change to C-rich chemistry did not remove all H. The present-day H-poor [WC] nature of the central star may be due to extensive mass loss and mixing following the late thermal pulse.

Abstract Copyright:

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

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 PN Vo 1 PN 06 59 26.4078328215 -79 38 47.129323563   16.7 15.8     [WC10] 94 0
2 WRAY 15-1269 PN 14 59 53.4814028450 -54 18 07.524725528 12.12 12.17 11.64 11.63   [WC11] 229 0
3 CPD-56 8032 PN 17 09 00.86008 -56 54 48.0957 11.24 11.48 11.04     [WC10] 250 0
4 V* V4334 Sgr NL* 17 52 32.69 -17 41 08.0   12.01       F2Ia 330 0
5 PN HuBi 1 PN 17 54 21.13 -15 55 52.0   15.42 14.90     [WC11] 82 0
6 HD 184738 PN 19 34 45.2337512278 +30 30 58.951476338   10.41 10.44     [WC9] 922 0
7 Hen 1-5 pA* 20 11 56.06832 +20 20 04.4916 11.41 10.66 9.45     G8/K0Iae 489 1
8 [D75b] Em* 21-021 PN 21 29 58.4712776885 +51 04 00.323547316   15.66 14.20 13.89   O7(f)/[WC11] 227 0

    Equat.    Gal    SGal    Ecl

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2020.10.24-02:54:55

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