2004A&A...417..201G


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET03:35:12

2004A&A...417..201G - Astronomy and Astrophysics, volume 417, 201-215 (2004/4-1)

Circumstellar dust shells of hot post-AGB stars.

GAUBA G. and PARTHASARATHY M.

Abstract (from CDS):

Parameters of the circumstellar dust shells of 15 hot post-AGB stars have been derived using a radiative transfer code (DUSTY). Combining the optical, near and far-infrared (ISO, IRAS) data of the stars, we have reconstructed their spectral energy distributions (SEDs) and estimated the dust temperatures, mass loss rates, angular radii of the inner boundary of the dust envelopes and the distances to these stars. The mass loss rates (10–6-10–5 M/yr) are intermediate between stars at the tip of the AGB and the PN phase. We have also studied the ISO spectra of 7 of these stars. Amorphous and crystalline silicate features were observed in IRAS 14331-6435 (Hen 3-1013), IRAS 18062+2410 (SAO 85766) and IRAS 22023+5249 (LSIII +5224) indicating oxygen-rich circumstellar dust shells. The presence of unidentified infrared (UIR) band at 7.7µ, SiC emission at 11.5µ and the ``26µ" and ``main 30µ" features in the ISO spectrum of IRAS 17311-4924 (Hen 3-1428) suggest that the central star may be carbon-rich. The ISO spectrum of IRAS 17423-1755 (Hen 3-1475) shows a broad absorption feature at 3.1µ due to C2H2 and/or HCN which is usually detected in the circumstellar shells of carbon-rich stars.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: early-type - stars: evolution - stars: circumstellar matter - infrared: stars

Simbad objects: 15

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Number of rows : 15

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 CD-48 7859 Be* 13 01 17.8016150677 -48 53 18.781347603   10.65 10.58     B5e 45 0
2 CD-55 5174 pA* 13 29 51.0242776206 -56 06 53.728822043 10.33 11.07 10.77 10.68   B1Iae 34 0
3 CPD-64 2939 pA* 14 37 10.1036450288 -64 48 04.628926033 11.13 11.55 10.97 10.86   B3Ie 45 0
4 CD-59 6142 pA* 16 25 02.6101255419 -60 03 32.318408221 9.85 10.31 9.97 10.00   A0Iae 37 0
5 LS IV -15 3 pA* 17 23 11.9084689157 -15 37 15.109812654   12.40 12.01     B1IIIpe 26 0
6 CD-49 11554 pA* 17 35 02.4967489802 -49 26 26.381444972 10.57 11.14 10.74     B1Iae 55 0
7 Hen 3-1475 PN 17 45 14.1763468506 -17 56 46.890631888   13.84 12.87     B7e 189 0
8 HD 161853 ** 17 49 16.5580430857 -31 15 18.070335520 7.48 8.11 7.97 8.81   O8V(n)z+B 72 2
9 CD-34 12448 s*b 18 05 38.2815566411 -34 09 30.236568938 11.7 13.18 12.83 12.36   B9Ia+e 22 0
10 HD 341617 pA* 18 08 20.0858893368 +24 10 43.318215616   11.41 11.39     B1IIIe 83 0
11 LSE 63 pA* 18 40 22.0185546049 -31 56 48.813482589   12.09 11.97 12.05 11.77 B1Iabe 20 0
12 LS 5112 pA* 18 40 48.6171443262 -17 04 38.332636166 11.94 12.38 11.93 11.88   B1IIIep 26 0
13 BD-13 5550 pA* 20 01 49.8289925402 -12 41 17.770844367 10.62 11.3 11.4     B1Ibe 72 0
14 EM* GGR 44 pA* 22 04 12.3050739203 +53 04 01.351510217   13.23 12.51     Be 37 0
15 LS III +51 42 Em* 22 51 38.9174508918 +51 50 42.438987221   12.01 11.78     B 73 1

    Equat.    Gal    SGal    Ecl

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2021.03.03-03:35:12

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