2004A&A...413..241W


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.06CEST10:40:07

2004A&A...413..241W - Astronomy and Astrophysics, volume 413, 241-249 (2004/1-1)

Australia Telescope Compact Array imaging of circumstellar HCN line emission from R Scl.

WONG T., SCHOEIER F.L., LINDQVIST M. and OLOFSSON H.

Abstract (from CDS):

We present radio-interferometric observations of HCN J=1->0 line emission from the carbon star R Scl, obtained with the interim 3-mm receivers of the Australia Telescope Compact Array. The emission is resolved into a central source with a Gaussian FWHM of ∼1", which we identify as the present mass loss envelope. Using a simple photodissociation model and constraints from single-dish HCN spectra, we argue that the present mass-loss rate is low, ∼2x10–7M/yr, supporting the idea that R Scl had to experience a brief episode of intense mass loss in order to produce the detached CO shell at ∼10" radius inferred from single-dish observations. Detailed radiative transfer modelling yields an abundance of HCN relative to H2, fHCN, of ∼10–5 in the present-day wind. There appears to be a discrepancy between model results obtained with higher transition single-dish data included and those from the J=1->0 interferometer data alone, in that the interferometer data suggest a smaller envelope size and larger HCN abundance than the single-dish data. The lack of HCN in the detached shell, fHCN≲2x10–7, is consistent with the rapid photodissociation of HCN into CN as it expands away from the star.

Abstract Copyright:

Journal keyword(s): circumstellar matter - stars: carbon - stars: AGB and post-AGB - stars: mass-loss

Status at CDS:  

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 QSO B0104-408 QSO 01 06 45.10796851 -40 34 19.9602291   18.60 19.0 19.25   ~ 117 0
2 V* R Scl C* 01 26 58.0946233986 -32 32 35.437732667 17.26 9.59 5.72 3.69 2.30 C-N5+ 293 0
3 QSO B0208-512 BLL 02 10 46.2000629834 -51 01 01.893312084   17.10 16.93 14.82   ~ 377 1
4 V* U Cam C* 03 41 48.1762532767 +62 38 54.397016016   11.5 11.00     C-N5 230 0
5 QSO B0420-0127 QSO 04 23 15.80072776 -01 20 33.0654034   17.50 17.00 16.28   ~ 1033 3
6 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2121 0
7 V* U Ant C* 10 35 12.8508908507 -39 33 45.320533564 15.32 8.22 5.38 3.18 1.86 C-N3 136 0
8 V* S Sct C* 18 50 20.0367524071 -07 54 27.430964220 13.93 9.89 6.80     C-N5 194 0
9 QSO B1921-293 BLL 19 24 51.05595514 -29 14 30.1210524   18.71 18.21 15.07   ~ 674 0
10 V* TT Cyg C* 19 40 57.0159854799 +32 37 05.755486755   10.43 10.20     C-N5- 185 0
11 ICRF J225805.9-275821 Sy1 22 58 05.96288481 -27 58 21.2567425   17.34 16.77 17.20   ~ 287 1

    Equat.    Gal    SGal    Ecl

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2020.04.06-10:40:07

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