2001MNRAS.322..280Z


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.17CEST02:40:19

2001MNRAS.322..280Z - Mon. Not. R. Astron. Soc., 322, 280-308 (2001/April-1)

Bipolar outflows in OH/IR stars.

ZIJLSTRA A.A., CHAPMAN J.M., TE LINTEL HEKKERT P., LIKKEL L., COMERON F., NORRIS R.P., MOLSTER F.J. and COHEN R.J.

Abstract (from CDS):

We investigate the development of bipolar outflows during the early post-AGB evolution. A sample of 10 OH/IR stars with irregular OH spectra and unusually large expansion velocities is observed at high angular resolution. The sample includes bipolar nebulae (e.g., OH231.8+4.2), bright post-AGB stars (HD 101584) and reflection nebulae (e.g., Roberts 22). The IRAS colour-colour diagram separates the sample into different types of objects. One group may contain the immediate progenitors to the (few) extreme bipolar planetary nebulae. Two objects show colours and chemistry very similar to the planetary nebulae with late IR-[WC] stars. One object is a confirmed close binary.

A model is presented consisting of an outer AGB wind which is swept up by a faster post-AGB wind, with either the AGB or post-AGB wind being non-spherically symmetric. The interface of the two winds is shown to exhibit a linear relation between velocity and distance from the star, giving the impression of an accelerating outflow. The OH data confirm the predicted linear velocity gradients, and also reveal torus-like, uniformly expanding components.

All sources are discussed in detail using optical/HST images where available. ISO data for Roberts 22 reveal a chemical dichotomy, with both crystalline silicates and PAH features being present. IRAS 16342-3814 shows a dense torus with mass 0.1M and density of 108cm–3; HST data show four point-like sources located symmetrically around the nebula, near the outer edge of the dense torus.

Lifetimes for the bipolar OH/IR stars are shown to be in excess of 104yr, longer than normal post-AGB time-scales. This suggests that the toruses or discs are near-stationary. We suggest that accretion from such a disc slows down the post-AGB evolution. Such a process could explain the link between the long-lived bipolar nebular geometry and the retarded star.


Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): masers - stars: AGB and post-AGB - planetary nebulae: general - infrared: stars

Simbad objects: 53

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Number of rows : 53

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 RAFGL 618 pA* 04 42 53.6245215366 +36 06 53.397219192   16.32   12.59   C-rich 966 0
2 IRAS 04496-6958 C* 04 49 18.486 -69 53 14.52 20.060 20.027 18.791 15.087 15.060 C 45 0
3 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 725 0
4 PN Vo 1 PN 06 59 26.4078328215 -79 38 47.129323563   16.7 15.8     [WC10] 94 0
5 V* VY CMa s*r 07 22 58.32877 -25 46 03.2355 12.01 10.19 7.95     M5Iae 1028 0
6 OH 231.8 +4.2 OH* 07 42 16.947 -14 42 50.20           M10III+A 509 1
7 CD-37 4167 C* 08 02 04.9975166437 -38 11 52.162981073   14.1 10.3     C-J4 48 0
8 IRAS 08005-2356 pA* 08 02 40.7024600066 -24 04 42.576601013   12.85       F5Iae 85 0
9 IRAS 09371+1212 pA* 09 39 53.96 +11 58 52.6           K7II/III 159 0
10 MR 22 PN 10 21 33.826 -58 05 48.26     12.7     A2Ie 101 0
11 IRAS 10481-6930 OH* 10 49 47.6849647680 -69 45 59.943195548           ~ 9 1
12 V* V Hya C* 10 51 37.2614060865 -21 15 00.339641553   12.23 6.80     C-N:6 344 0
13 HD 101584 pA* 11 40 58.8052292556 -55 34 25.813187841 7.80 7.40 7.01     B8/9I/IIe 128 0
14 IRAS 13328-6244 OH* 13 36 18.93 -62 59 19.2           ~ 6 0
15 PN MyCn 18 PN 13 39 35.0560904148 -67 22 51.758576199   13.30 12.54 13.19 12.61 ~ 269 1
16 IRAS 13442-6109 OH* 13 47 46.1322358512 -61 24 29.788413814       15.28   M10 18 0
17 IRAS 14028-5836 OH* 14 06 21.2 -58 50 41           ~ 5 0
18 IRAS 15303-5456 OH* 15 34 10.7 -55 06 47           ~ 7 0
19 IRAS 15405-4945 Mas 15 44 11.2 -49 55 22           ~ 13 1
20 OH 326.5 -0.6 pA* 15 49 11.3361694808 -55 08 51.838137874           ~ 28 0
21 IRAS 15509-5207 OH* 15 54 46.0 -52 16 29           ~ 8 0
22 OH 337.5 +0.1 OH* 16 37 02.411 -47 00 36.68           ~ 12 0
23 IRAS 16342-3814 pA* 16 37 39.8700524769 -38 20 17.440442399           ~ 130 0
24 OH 338.5 -0.2 OH* 16 41 59.419 -46 32 15.79           ~ 14 0
25 PN M 2-9 PN 17 05 37.952 -10 08 34.58   12.59 14.7     Be 507 0
26 IRAS 17079-3844 pA* 17 11 23.2 -38 48 18           ~ 5 0
27 NGC 6302 PN 17 13 44.339 -37 06 10.95   7.1 10.10     ~ 762 1
28 IRAS 17253-2831 pA* 17 28 33.3 -28 33 28           ~ 9 0
29 ESO 455-139 PN 17 39 02.9178955380 -28 56 35.628312537     17.2     ~ 67 0
30 PN Hb 4 PN 17 41 52.7988053576 -24 42 08.343474051   18.4 17     [WC4] 207 1
31 IRC -30316 OH* 17 42 35.0213310681 -30 05 41.840711558     15     M4 33 0
32 Hen 3-1475 PN 17 45 14.1763468506 -17 56 46.890631888   13.84 12.87     B7e 189 0
33 OH 359.970 -0.049 OH* 17 45 44.32 -28 59 13.3           ~ 12 0
34 OH 0.55 -0.06 OH* 17 47 09 -28 30.0           ~ 9 0
35 OH 10.0 -0.1 OH* 18 08 16.384 -20 16 11.56           ~ 30 0
36 OH 12.3 +0.1 Mas 18 12 02 -18 15.2           ~ 3 0
37 IRAS 18091-1815 pA* 18 12 03.4 -18 14 25           ~ 8 0
38 IRAS 18246-1032 OH* 18 27 24.0 -10 30 24           ~ 16 0
39 OH 24.0 -0.2 Mas 18 35 43.1 -08 01 33           ~ 3 0
40 IRC +10365 Mi* 18 37 19.2595666948 +10 25 42.492197977           M9 140 0
41 IRAS 18491-0207 pA* 18 51 46.9 -02 04 09           ~ 19 1
42 IRAS 18585+0900 OH* 19 00 53.8211439992 +09 05 02.730557895           O-rich 20 1
43 IRAS 19052+1431 OH* 19 07 33.95 +14 36 47.4           ~ 8 0
44 HD 179821 pA* 19 13 58.6083165753 +00 07 31.934676028 10.81 9.694 8.19     G4_0-Ia 226 0
45 IRC +10420 pA* 19 26 48.0981288433 +11 21 16.756524951   13.98 11.66     F8Ia+e 458 0
46 PN K 3-35 PN 19 27 43.9751068155 +21 30 02.898607561           ~ 135 0
47 Hen 2-437 PN 19 32 57.6036081047 +26 52 43.089721565           ~ 91 1
48 HD 184738 PN 19 34 45.2337512278 +30 30 58.951476338   10.41 10.44     [WC9] 925 0
49 HD 187885 pA* 19 52 52.7031438648 -17 01 50.293465852   9.25 8.68 8.32   F2/6Ia 171 0
50 NML Cyg s*r 20 46 25.5382179476 +40 06 59.396202678   18.64 16.60     M7/8 486 0
51 V* V1610 Cyg pA* 21 02 18.27 +36 41 37.0           F5Iae 840 1
52 IRAS 22036+5306 pA* 22 05 30.29 +53 21 32.8   19.2       F4III 74 0
53 V* PZ Cas s*r 23 44 03.2794635453 +61 47 22.187155352 12.80 11.48 8.90 6.08 3.90 M3Ia 192 0

    Equat.    Gal    SGal    Ecl

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2021.05.17-02:40:19

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