Infrared studies of V838 Mon and V4332 Sgr - a new class of nova-like variables.

Details Infrared studies of V838 Mon and V4332 Sgr - a new class of nova-like variables. Infrared studies of V838 Mon and V4332 Sgr - a new class of nova-like variables.

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20581a&link_type=abstract

Spitzer Proposal ID #20581

Computer Science

Scientific paper

Based on encouraging results that we have obtained with Spitzer Cycle 1 observations, we propose to extend our studies of the extremely interesting objects V838 Mon and V4332 Sgr. These objects, which had powerful nova-like outbursts in the recent past, are being recognized as a new class of eruptive variables. Our recent work on them in the optical and near-infrared have yielded several exciting results on them. These have given valuable insights into the nature of their circumstellar environment. However, while much has been learned about them, the cause of their mysterious outbursts is not a completely resolved issue. Our Spitzer observations detects the presence of extended nebulosity around V838 Mon. We show that while a part of this nebulosity could be the IR equivalent of the optical light echo, a significant part of it could be due to intrinsic emission from extended cold dust that surrounds the object. We propose observations that have the potential to (i) establish the origin and location of the dust causing the nebulosity (ii) study whether VMon-type objects have more than one outburst (iii) attempt to establish whether V838 Mon has a hot B type companion as suggested by the optical data and (iv) make the first study of the evolution of the light echo in the mid/far infrared in case the extended nebulosity around V838 Mon is basically a light-echo. Our proposed studies of V4332 Sgr will monitor the evolution of an object which is shown to display significant short-term photometric and spectroscopic changes.

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