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NICMOS Imaging of HD 179821 and AFGL 4106

Published online by Cambridge University Press:  15 December 2006

M. Bobrowsky ,
T. Ueta  and
M. Meixner
M. Bobrowsky
Affiliation:
CSC/Space Telescope Science Institute, Baltimore, MD, USA email: mattb@stsci.edu
T. Ueta
Affiliation:
NASA Ames Research Center/SOFIA, Moffett Field, CA, USA
M. Meixner
Affiliation:
Space Telescope Science Institute, Baltimore, MD, USA
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Abstract

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Near-infared images from a NICMOS survey revealed the circumstellar matter around several proto-planetary nebulae (PPNe), including IRAS 18184–1623, AFGL 4106, and HD 179821 (=IRAS 19114+0002). The IRAS 18184 data was previously analyzed by O'Hara et al. (2003). Here we present the data on the other two objects.

The true nature of HD 179821 is still a subject of some debate. It could be a yellow hypergiant or a post-AGB star. Regardless, the NICMOS images show that it is surrounded by a nebula with a diameter of $\sim12^{\prime\prime}$. Until 1600 years ago, it was losing mass at a rate of 3 $\times 10^{-4}$ M$_{\odot}$ yr$^{-1}$. It now exhibits multiple concentric shells with small bipolar outer protuberances.

AFGL 4106 was known previously as a spectroscopic binary, consisting of a luminous F-type post-red-supergiant and an M-type red supergiant. It is surrounded by a faint nebula with a diameter of $\sim3^{\prime\prime}$. Here we present the first image that shows not only the nebula but also the binary companion. It appears at a position angle of $\sim270^{\circ}$ and a separation of 0.$^{\prime\prime}$3.

Keywords

planetary nebulae: individual (HD 179821, AFGL 4106)circumstellar matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S234: Planetary Nebulae in our Galaxy and Beyond , April 2006 , pp. 371 - 372
Copyright
© 2006 International Astronomical Union