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10.1051_0004-6361_202141662 | page_0000 | Astronomy &Astrophysics A&A 658, A135 (2022)
https://doi.org/10.1051/0004-6361/202141662
© J. M. Winters et al. 2022
Molecules, shocks, and disk in the axi-symmetric wind of the
MS-type AGB star RS Cancri?
J. M. Winters1
, D. T. Hoai2
, K. T. Wong1
, W.-J. Kim3,4
, P. T. Nhung2
, P. Tuan-Anh2
, P. Lesaffre5
,
P. Darriu... |
10.1051_0004-6361_202141662 | page_0001 | A&A 658, A135 (2022)
We have concentrated our efforts on two relatively close
(d150pc) sources that show composite profiles in CO rota-
tional lines (Winters et al. 2003): EP Aqr (Winters et al. 2007,
hereafter referred to as W2007), and RS Cnc (Libert et al. 2010).
Data obtained at IRAM show that these two sources hav... |
10.1051_0004-6361_202141662 | page_0002 | J. M. Winters et al.: Molecules, shocks, and disk in the axi-symmetric wind of the MS-type AGB star RS Cancri
Table 1. Properties of the combined data sets for all detected lines.
Line Frequency Eu=k Peak flux FWHP beam size PA 1 noise vel.res Comments(a)
(GHz) (K) (Jy) (arcsec) (arcsec2) (deg) (mJy beam 1) ( km s 1)
1... |
10.1051_0004-6361_202141662 | page_0003 | A&A 658, A135 (2022)
Fig. 1. Overview of the frequency ranges observed with PolyFiX using two spectral setups (setup1: red and setup2: blue, respectively). Lower
diagrams : zoom onto the individual spectra covering 7.8 GHz each. Upper row : setup1, lower row : setup2. The central 20 MHz at the border
between inner and ... |
10.1051_0004-6361_202141662 | page_0004 | J. M. Winters et al.: Molecules, shocks, and disk in the axi-symmetric wind of the MS-type AGB star RS Cancri
Fig. 2. Continuum map around 247 GHz from A-configuration. Con-
tours are plotted in 100 steps, where 1 is 47.6 Jy beam 1. The
synthesized beam is indicated in the lower left corner.
Fig. 3. CO line profiles, ... |
10.1051_0004-6361_202141662 | page_0005 | A&A 658, A135 (2022)
Fig. 6. Profile around the SiO( v=2,J=5–4) line frequency. A-
configuration and D-configuration merged. The spectral resolution is
1 km s 1and the emission is integrated over the central 100100aperture.
the idea that the SiO masers are excited by infrared pumping as
opposed to collisional pumping (se... |
10.1051_0004-6361_202141662 | page_0006 | J. M. Winters et al.: Molecules, shocks, and disk in the axi-symmetric wind of the MS-type AGB star RS Cancri
).
Fig. 8. HCN line profiles. Left: HCN(3–2); A-configuration and D-
configuration merged with a spectral resolution of 0.5 km s 1.Right :
H13CN(3–2); A-configuration and D-configuration merged with a spec-
tral res... |
10.1051_0004-6361_202141662 | page_0007 | A&A 658, A135 (2022)
Fig. 10. Profiles of the four detected SO lines, with A-configuration
and D-configuration merged. The spectral resolution is 3 km s 1and the
emission is integrated over the central 200200aperture.
Fig. 11. Profiles of the two34SO lines detected here, with A-
configuration and D-configuration merged. The... |
10.1051_0004-6361_202141662 | page_0008 | J. M. Winters et al.: Molecules, shocks, and disk in the axi-symmetric wind of the MS-type AGB star RS Cancri
Table 2. Parameters of the detected SO 2lines used for the population diagram analysis.
Frequency WI=R
S(v)dv g ulog10(Aul) Eu=kab
(GHz) (Jy km s 1) (s 1) (K) (arcsec2)
214.6894 0.1410.0385 33 –4.0043 147.8... |
10.1051_0004-6361_202141662 | page_0009 | A&A 658, A135 (2022)
AGB stars, such as W Hya (Vlemmings et al. 2017), EP Aqr
(Tuan-Anh et al. 2019), oCet (Hoai et al. 2020), R Dor (Decin
et al. 2018; Nhung et al. 2019a, 2021), and in 15 out of 17 sources
observed in the ALMA Large Program ATOMIUM (Decin et al.
2020; Gottlieb et al. 2022), calling for a common mecha... |
10.1051_0004-6361_202141662 | page_0010 | J. M. Winters et al.: Molecules, shocks, and disk in the axi-symmetric wind of the MS-type AGB star RS Cancri
Fig. 17. First-moment maps of different lines, indicating a possibly rotating structure (see Sect. 3.4). Left: HCN(3–2), middle left : SO 2(14(0,14)–
13(1,13)), middle right : SiO(v=1,6–5), right : SO(7(6)–6(5)... |
10.1051_0004-6361_202141662 | page_0011 | A&A 658, A135 (2022)
Fig. 18. Velocity-integrated intensity maps of the12CO(2–1) line ( upper row ) and the vibrational ground-state line of SiO(6–5) ( lower row ),
covering three velocity intervals. Left: blue line wing [ vlsr; 10,vlsr; 2] km s 1,middle : line center [ vlsr; 2,vlsr;+2] km s 1,right : red line
wing... |
10.1051_0004-6361_202141662 | page_0012 | J. M. Winters et al.: Molecules, shocks, and disk in the axi-symmetric wind of the MS-type AGB star RS Cancri
Fig. 20. CO data and 3D reconstruction. Left panels : flux density averaged over 0:400<R<2:500in thevzvs.!plane for12CO(2–1) ( left) and
13CO(2–1) ( center-left ).Right panels : de-projected flux density projecte... |
10.1051_0004-6361_202141662 | page_0013 | A&A 658, A135 (2022)
Fig. 21. Best-fit results for CO. Left panels : same as in Fig. 20, but for the model best fit. Right panels : modeledvzspectra (red) compared with
observations (black) for12CO(2–1) ( center-right ) and13CO(2–1) ( right ).
Table 3. Parameters of the best-fit model for CO.
Region vterm r1=2 T0 r0 Openi... |
10.1051_0004-6361_202141662 | page_0014 | J. M. Winters et al.: Molecules, shocks, and disk in the axi-symmetric wind of the MS-type AGB star RS Cancri
Fig. 22. Enhanced12CO(2–1) emission at vlsr6:75km s 1.Upper panels : channel maps of the12CO(2–1) line emission between 6.25 and
7.25 km s 1.Lower panels : projection of the flux density multiplied by Ron thevl... |
10.1051_0004-6361_202141662 | page_0015 | A&A 658, A135 (2022)
Fig. 24. Doppler velocity spectra integrated over 0:2<R<2:5arcsec (black) and within R<0:2arcsec (red) for SiO(5–4), SiO(6–5), and12CO(2–
1)from left to right .
beyond some 10to50AU from the center of the star. In order
to understand the mechanism of condensation of SiO molecules
on dust grains, it... |
10.1051_0004-6361_202141662 | page_0016 | J. M. Winters et al.: Molecules, shocks, and disk in the axi-symmetric wind of the MS-type AGB star RS Cancri
Fig. 25. Analysis of SiO and comparison with CO. Left: ratio RTof SiO(5–4) to SiO(6–5) line emitted fluxes as a function of Rforjvzj<8km s 1.
Corresponding temperature values using the relation T[K]=12:5=(ln(RT)... |
10.1051_0004-6361_202141662 | page_0017 | A&A 658, A135 (2022)
other than radiation is needed to accelerate matter preferentially
along the polar axis.
Axi-symmetric models have been developed on the assump-
tion that a companion disturbs the gravitational field (Theuns
& Jorissen 1993; Mastrodemos & Morris 1999; Decin et al.
2020). These models have been succe... |
10.1051_0004-6361_202141662 | page_0018 | J. M. Winters et al.: Molecules, shocks, and disk in the axi-symmetric wind of the MS-type AGB star RS Cancri
configurations, linear combinations between them, several mag-
netic field decay exponents, but have not yet investigated them
systematically. The purpose of our investigation here is simply to
show that a magnet... |
10.1051_0004-6361_202141662 | page_0019 | A&A 658, A135 (2022)
which translate to abundance ratios of X(SO2=H2)=1:510 6
andX(HCN/H 2)=6:610 7, respectively, well within the range
expected for an MS-type star.
We find broad wings in the spectral line profiles of vibra-
tional ground-state transitions of SiO and SO and in first
vibrationally excited transitions o... |
10.1051_0004-6361_202141662 | page_0020 | J. M. Winters et al.: Molecules, shocks, and disk in the axi-symmetric wind of the MS-type AGB star RS Cancri
Mamon, G. A., Glassgold, A. E., & Huggins, P. J. 1988, ApJ, 328, 797
Mastrodemos, N., & Morris, M. 1999, ApJ, 523, 357
Matt, S., & Balick, B. 2004, ApJ, 615, 921
Matt, S., Balick, B., Winglee, R., & Goodson, A.... |
10.1051_0004-6361_202141662 | page_0021 | A&A 658, A135 (2022)
Appendix A: Resolved out flux
Fig. A.1. Effect of missing short spacing information on the CO
lines. Left:12CO(2–1). Right:13CO(2-1). A-configuration and D-
configuration are merged, the spectral resolution is 0.5 km s 1and the
CO emission is integrated over the central 22002200, i.e., over the full
... |
10.1051_0004-6361_202141662 | page_0022 | J. M. Winters et al.: Molecules, shocks, and disk in the axi-symmetric wind of the MS-type AGB star RS Cancri
Fig. B.1. Velocity-integrated intensity maps of the HCN(3-2) (upper row) and H13CN(3-2) lines (lower row), covering three velocity intervals.
Left: Blue line wing [v lsr; 10,vlsr; 2] km s 1, Middle: line cent... |
10.1051_0004-6361_202141662 | page_0023 | A&A 658, A135 (2022)
Fig. B.3. Velocity-integrated intensity maps of the SO(6(6)-5(5)) (upper row), SO(5(5)-4(4)) (second row), SO(6(5)-5(4)) (third row) and SO(7(6)-
6(5)) (lower row) lines covering three velocity intervals. Left: Blue line wing [v lsr; 10,vlsr; 2] km s 1, Middle: Line center [v lsr; 2,vlsr;+2]
km... |
10.1051_0004-6361_202141662 | page_0024 | J. M. Winters et al.: Molecules, shocks, and disk in the axi-symmetric wind of the MS-type AGB star RS Cancri
Fig. B.4. Velocity-integrated intensity maps of SO 2(9(3, 7)-9(2, 8)) (lowest E u, upper row), SO 2(14(0,14)-13(1,13)) (strongest SO 2line, second
row), and SO 2(34(4,30)-34(3,31)) (highest E u, lower row), cov... |
10.1051_0004-6361_202141662 | page_0025 | A&A 658, A135 (2022)
Fig. C.1. Profiles of all the 11 detected SO 2lines. A-configuration and
D-configuration data are merged, the spectral resolution is 3 km s 1,
and the emission is integrated over the central 200200square aperture.
The lines are ordered by decreasing frequency from top to bottom and
left to right.
0.5... |
10.1051_0004-6361_202141662 | page_0026 | J. M. Winters et al.: Molecules, shocks, and disk in the axi-symmetric wind of the MS-type AGB star RS Cancri
0.5" 0.0" -0.5"0.6"
0.4"
0.2"
0.0"
-0.2"
-0.4"
R.A. Offset (arcsec)Dec. Offset (arcsec)SO2
1.01.52.02.53.03.5Ntot (cm2)
1e15
20
0 200.000.020.04Flux [Jy/pixel]SO2 (16(3,13)16(2,14))
20
0 200.000.010.020.030.0... |
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