2014ApJ...780...41M


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.18CEST03:43:20

2014ApJ...780...41M - Astrophys. J., 780, 41 (2014/January-1)

The gas-rich circumbinary disk of HR 4049. I. A detailed study of the mid-infrared spectrum.

MALEK S.E. and CAMI J.

Abstract (from CDS):

We present a detailed analysis of the mid-infrared spectrum of the peculiar evolved object HR 4049. The full Spitzer-IRS high-resolution spectrum shows a wealth of emission with prominent features from CO2 and H2O and possible contributions from HCN and OH. We model the molecular emission and find that it originates from a massive (M ≳ 8x10–3 M), warm (Tex~ 500 K) and radially extended gas disk that is optically thick at infrared wavelengths. We also report less enrichment in 17O and 18O than previously found and a comparison of the Spitzer observations to earlier data obtained by the Short Wavelength Spectrometer on board the Infrared Space Observatory reveals that the CO2flux has more than doubled in 10 yr time, indicating active and ongoing chemical evolution in the circumbinary disk. If the gas originates from interaction between the stellar wind and the dust, this suggests that the dust could be oxygen-rich in nature. The molecular gas plays a crucial role in the thermal properties of the circumbinary disk by allowing visible light to heat the dust and then trapping the infrared photons emitted by the dust. This results in higher temperatures and a more homogeneous temperature structure in the disk.

Abstract Copyright:

Journal keyword(s): circumstellar matter - stars: AGB and post-AGB - stars: individual: HR 4049

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 SMP LMC 11 PN 04 51 37.824 -67 05 16.63 19.156 20.303 20.142   19.582 ~ 47 0
2 V* PS Gem pA* 07 03 39.6306725638 +10 46 13.076555664   7.76 7.37     A0 108 0
3 HD 89353 pA* 10 18 07.5892879413 -28 59 31.194541133   5.76 5.53     B9.5Ib/II 289 0
4 HD 101013 SB* 11 37 53.0007631393 +50 37 05.472894065   7.200 6.113     G9:IIIb:Ba2.5 136 0
5 PN Tc 1 PN 17 45 35.2877697798 -46 05 23.713203258   11.30 11.49     PCyg 243 0
6 V* EP Lyr pA* 19 18 19.5565673262 +27 51 03.077324082   11.22 9.96 10.14   G2II 84 1

    Equat.    Gal    SGal    Ecl

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2021.05.18-03:43:20

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