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
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
| Name | RA(2000) | DEC(2000) | Mode | Obs.Time (min.) | |
| HR4049 | 10 18 07.59 | -28 59 31.2 | img SiC, 0.075 | 10 | |
| HR4049 | 10 18 07.59 | -28 59 31.2 | img PAH2, 0.075 | 10 | |
| HR4049 | 10 18 07.59 | -28 59 31.2 | img PAH2_2, 0.075 | 10 | |
| HR4049 | 10 18 07.59 | -28 59 31.2 | img SiC, 0.127 | 10 | |
| IRA10135-2614 | 10 15 53.6 | -26 29 09 | img SiC, 0.127 | 5 | |
| HR4049 | 10 18 07.59 | -28 59 31.2 | img Q1, 0.127 | 10 | |
| IRA10135-2614 | 10 15 53.6 | -26 29 09 | img Q1, 0.127 | 5 |