2012A&A...542A..53V


Query : 2012A&A...542A..53V

2012A&A...542A..53V - Astronomy and Astrophysics, volume 542A, 53-53 (2012/6-1)

IRAS 11472-0800: an extremely depleted pulsating binary post-AGB star.

VAN WINCKEL H., HRIVNAK B.J., GORLOVA N., GIELEN C. and LU W.

Abstract (from CDS):

We focus here on one particular and poorly studied object, IRAS11472-0800. It is a highly evolved post-asymptotic giant branch (post-AGB) star of spectral type F, with a large infrared excess produced by thermal emission of circumstellar dust. We deployed a multi-wavelength study that includes the analyses of optical and IR spectra as well as a variability study based on photometric and spectroscopic time-series. The spectral energy distribution (SED) properties as well as the highly processed silicate N-band emission show that the dust in IRAS11472-0800 is likely trapped in a stable disc. The energetics of the SED and the colour variability show that our viewing angle is close to edge-on and that the optical flux is dominated by scattered light. With photospheric abundances of [Fe/H]=-2.7 and [Sc/H]=-4.2, we discovered that IRAS11472-0800 is one of the most chemically-depleted objects known to date. Moreover, IRAS11472-0800 is a pulsating star with a period of 31.16 days and a peak-to-peak amplitude of 0.6mag in V. The radial velocity variability is strongly influenced by the pulsations, but the significant cycle-to-cycle variability is systematic on a longer time scale, which we interpret as evidence for binary motion. We conclude that IRAS11472-0800 is a pulsating binary star surrounded by a circumbinary disc. The line-of-sight towards the object lies close to the orbital plane, therefore the optical light is dominated by scattered light. IRAS11472-0800 is one of the most chemically-depleted objects known so far and links the dusty RVTauri stars to the non-pulsating class of strongly depleted objects.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - binaries: general - binaries: spectroscopic - stars: chemically peculiar - stars: evolution - stars: abundances

VizieR on-line data: <Available at CDS (J/A+A/542/A53): table3.dat table6.dat>

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * alf Per V* 03 24 19.3700924 +49 51 40.245455 2.64 2.27 1.79     F5Ib 818 1
2 V* RV Tau RV* 04 47 06.7239850584 +26 10 45.532913268   11.00 9.80     K0 272 1
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16002 1
4 SV* HV 12631 RV* 05 39 32.80 -71 21 54.3 16.371 15.532 15.155 14.443 14.449 C 17 0
5 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 735 0
6 V* PS Gem pA* 07 03 39.6305052432 +10 46 13.068774048   7.76 7.37     A0 111 0
7 HD 89353 pA* 10 18 07.5899342712 -28 59 31.195183524   5.76 5.53     B9.5Ib/II 296 0
8 GSC 05517-00096 EB* 11 49 41.0473876536 -08 15 53.681223528     13.30 13.28   ~ 3 0
9 GSC 05517-00159 * 11 49 45.8309915832 -08 17 43.476267480   13.2   13.13   ~ 1 0
10 V* AF Crt pA* 11 49 48.0368308800 -08 17 20.452690140   11.72 11.17 11.50 10.592 ~ 32 0
11 GSC 05517-00163 * 11 49 48.4322271576 -08 17 49.731244620   13.42   13.09 12.18 ~ 1 0
12 V* RU Cen RV* 12 09 23.8148403768 -45 25 34.801333356   9.81 8.70     G1Ie 92 0
13 V* SX Cen RV* 12 21 12.5736554208 -49 12 41.058679536   10.11 9.60     B5III 68 0
14 IRAS 17233-4330 pA* 17 26 58.6372808208 -43 33 13.574510568   11.99 11.56     A2Iab 20 0
15 V* AC Her pA* 18 30 16.2373118976 +21 52 00.599340000 8.00 7.79 7.01     F4Ibp 325 0
16 V* EP Lyr pA* 19 18 19.5570243336 +27 51 03.082292928   11.22 9.96 10.14   G2II 85 1
17 V* QY Sge LP* 20 07 54.6224115384 +18 42 54.538913232   12.57       G0Ie 52 0
18 BD+39 4926 pA* 22 46 11.2272974832 +40 06 26.309865960   9.43 9.29     B8 118 0

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2022.05.28-09:10:32

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