2023A&A...671A..80G


Query : 2023A&A...671A..80G

2023A&A...671A..80G - Astronomy and Astrophysics, volume 671A, 80 (2023/3-1)

The nebula around the binary post-AGB star 89 Herculis.

GALLARDO CAVA I., ALCOLEA J., BUJARRABAL V., GOMEZ-GARRIDO M. and CASTRO-CARRIZO A.

Abstract (from CDS):

Context. There is a class of binary post-asymptotic giant branch (post-AGB) stars that exhibit remarkable near-infrared (NIR) excess. These stars are surrounded by disks with Keplerian or quasi-Keplerian dynamics and outflows composed of gas escaping from the rotating disk. Depending on the dominance of these components, there are two subclasses of binary post-AGB stars: disk-dominated and outflow-dominated.
Aims. We aim to properly study the hourglass-like structure that surrounds the Keplerian disk around 89 Her.
Methods. We present total-power on-the-fly maps of 12CO and 13CO J = 2 - 1 emission lines in 89 Her. Previous studies are known to suffer from flux losses in the most extended components. We merge these total-power maps with previous NOEMA maps. The resulting combined maps are expected to detect the whole nebula extent of the source.
Results. Our new combined maps contain the entirety of the detectable flux of the source and at the same time are of high spatial resolution thanks to the interferometric observations. We find that the hourglass-like extended outflow around the rotating disk is larger and more massive than suggested by previous works. The total nebular mass of this very extended nebula is 1.8 × 10–2M, of which ∼65% comes from the outflow. The observational data and model results lead us to classify the envelope around 89 Her as an outflow-dominated nebula, together with R Sct and IRAS 19125+0343 (and very probably AI CMi, IRAS 20056+1834, and IRAS 18123+0511). The updated statistics on the masses of the two post-AGB main components reveal that there are two distinct subclasses of nebulae around binary post-AGB stars depending on which component is the dominant one. We speculate that the absence of an intermediate subclass of sources is due to the different initial conditions of the stellar system and not because both subclasses are in different stages of the post-AGB evolution.

Abstract Copyright: © The Authors 2023

Journal keyword(s): stars: AGB and post-AGB - binaries: general - circumstellar matter - stars: individual: 89 Herculis - radio lines: stars - planetary nebulae: general

VizieR on-line data: <Available at CDS (J/A+A/671/A80): list.dat fits/*>

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 765 0
2 V* PS Gem pA* 07 03 39.6305052432 +10 46 13.068774048   7.76 7.37     A0 120 0
3 V* AI CMi pA* 07 35 41.1506935176 +00 14 57.993628992   9.83 8.31     G5Iab 60 0
4 CD-44 4961 pA* 08 56 14.1799968840 -44 43 10.721249580   10.55 9.176     F3e 73 1
5 V* IW Car pA* 09 26 53.3035361952 -63 37 48.931552488   9.07 7.90     F7/8 94 0
6 HD 161796 pA* 17 44 55.4694563472 +50 02 39.482823336 8.00 7.68 7.21 6.77 6.51 F3Ib 326 0
7 * 89 Her pA* 17 55 25.1883476136 +26 02 59.968457664 5.36 5.70 5.36 5.06 4.94 F2Ibp 411 0
8 V* V2053 Oph pA* 18 14 49.3841392968 +05 12 55.714343112   11.75 10.28     C 46 0
9 V* AC Her RV* 18 30 16.2373118976 +21 52 00.599340000 8.00 7.79 7.01     F4Ibp 340 0
10 V* R Sct cC* 18 47 28.9498974024 -05 42 18.542611800 8.30 6.67 5.20 4.14 3.37 K4/5pec 319 0
11 BD+03 3950 RV* 19 15 01.1800830552 +03 48 42.641057988   11.16 10.37     F8 39 0
12 BD-02 4931 pA* 19 18 22.7165647344 -02 42 10.880466588   11.55 10.78     B1III 35 0
13 V* QY Sge LP* 20 07 54.6224115384 +18 42 54.538913232   12.57       G0Ie 56 0
14 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2462 1

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