High Resolution imaging of the circumbinary disk of HR4049 in the mid IR.

Coordinator: Francesco Paresce, Simone Antonucci, Hans-Ulrich Kaeufl

Abstract:
HR4049 is the prototype of a group of post-AGB stars in binary systems with a high degree of metal depletion. The key to this feature is the presence of a massive, stable, long- lived, dusty circumbinary disk where, after the dust forms in the disk, the gas depleted of refractory elements is re-accreted by the star. A nova outburst associated with a white dwarf secondary has also been recently proposed to explain the envelope composition. The envelope has been resolved for the first time by the VLTI in the K band but the available data is inconclusive as to its shape. There is some evidence from MIDI acquisition images in the N band of an elongation in a particular direction. The source is very bright in the N band (50 Jy) so easily detected by VISIR. Its size, shape and spectrum represent crucial information to understand the nature of this enigmatic object. We propose to obtain images of HR4049 in the N, PAH and Q bands. IRAS10135-2614 2.5� away can be used for PSF calibration.


Data:
Program is available and data products can be downloaded


Target list
NameRA(2000)DEC(2000)ModeObs.Time (min.)
HR404910 18 07.59-28 59 31.2img SiC, 0.07510
HR404910 18 07.59-28 59 31.2img PAH2, 0.07510
HR404910 18 07.59-28 59 31.2img PAH2_2, 0.07510
HR404910 18 07.59-28 59 31.2img SiC, 0.12710
IRA10135-261410 15 53.6-26 29 09img SiC, 0.1275
HR404910 18 07.59-28 59 31.2img Q1, 0.12710
IRA10135-261410 15 53.6-26 29 09img Q1, 0.1275