2005ApJ...635L..49K

Query : 2005ApJ...635L..49K

2005ApJ...635L..49K - Astrophys. J., 635, L49-L52 (2005/December-2)

Discovery of multiple coaxial rings in the quadrupolar planetary nebula NGC 6881.

KWOK S. and SU K.Y.L.

Abstract (from CDS):

We report the discovery of multiple two-dimensional rings in the quadrupolar planetary nebula NGC 6881. As many as four pairs of rings are seen in the bipolar lobes, and three rings are seen in the central torus. While the rings in the lobes have the same axis as one pair of the bipolar lobes, the inner rings are aligned with the other pair. The two pairs of bipolar lobes are likely to be carved out by two separate high-velocity outflows from the circumstellar material left over from the asymptotic giant branch (AGB) wind. The two-dimensional rings could be the results of dynamical instabilities or the consequence of a fast outflow interacting with remnants of discrete AGB circumstellar shells.

Abstract Copyright: ∼

Journal keyword(s): ISM: Planetary Nebulae: General - Stars: AGB and Post-AGB - Stars: Supernovae: General

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 76 PN 01 42 19.6557728208 +51 34 31.534970052     17.48   17.69 DOZ 385 2
2 RAFGL 618 pA* 04 42 53.6242032600 +36 06 53.400902220   16.32   12.59   C-rich 1027 0
3 SN 1987A SN* 05 35 27.98840 -69 16 11.1134           SNIIpec 5203 2
4 NGC 2346 PN 07 09 22.5215800440 -00 48 23.610997332   11.76 11.58     A5V 592 0
5 NGC 2440 PN 07 41 55.34603 -18 12 30.4117   11.469 10.104     ~ 665 2
6 PN My 59 PN 10 23 09.1381004472 -60 32 42.103742784           O(H)7-9I 136 2
7 PN MyCn 18 PN 13 39 35.0596178496 -67 22 51.750497136   13.30 12.54 13.19 12.61 ~ 293 1
8 WRAY 16-147 Sy* 14 11 52.0604355768 -51 26 24.187122024     14.20     ~ 240 1
9 WRAY 15-1269 PN 14 59 53.4819371136 -54 18 07.521138792 12.12 12.17 11.64 11.63   [WC11] 256 0
10 NGC 6302 PN 17 13 44.5 -37 06 11           O-rich 821 2
11 PN Hb 5 PN 17 47 56.20 -29 59 39.6   10.50 10.78     ~ 274 0
12 PN M 1-37 PN 18 05 25.8092901000 -28 22 04.282489956     14.70     [WC11]? 135 0
13 NGC 6881 PN 20 10 52.45 +37 24 42.4           ~ 213 0
14 V* V1610 Cyg pA* 21 02 18.27 +36 41 37.0           F5Iae 892 1
15 PN KjPn 8 PN 23 24 10.472 +60 57 30.75           ~ 123 0
16 PN Hb 12 PN 23 26 14.8236376464 +58 10 54.543292356   13.51 11.49 12.44   Oe 338 0

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