----- Attempting Submission 1 (Tue Dec 16 20:16:59 GMT 2008) ----- Assigned ID: 2004 ----- Attempting Submission 1 (Fri Nov 21 17:59:06 GMT 2008) ----- The Light Echoes around V838 Monocerotis: Cycle 16 DD This is a DD program in which we propose to obtain WFPC2 imaging of the light echo around V838 Mon in late 2008 or early 2009. We were awarded Cycle 17 time to image the echo with ACS at 2 epochs (3+4 orbits). To obtain data of similar quality with WFPC2 requires 7 orbits at 2 different pointings. Because of the SM4 delay, we are therefore requesting a 14-orbit DD program for Cycle 16, leaving the Cycle 17 allocation unchanged for continued monitoring of the event in late 2009 and 2010. V838 Monocerotis, which burst upon the astronomical scene in early 2002, is a completely unanticipated new object. It underwent a large-amplitude and very luminous outburst, during which its spectrum remained that of an extremely cool supergiant. A rapidly evolving set of light echoes around V838 Mon was discovered soon after the outburst, quickly becoming the most spectacular display of the phenomenon yet seen. These light echoes provide the means to accomplish three unique types of measurements based on continued HST imaging: (1) study MHD turbulence at high resolution and in 3 dimensions; (2) construct the first unambiguous and fully 3-D map of a circumstellar dust envelope; (3) study dust physics in a unique setting where the spectrum and light curve of the illumination, and the scattering angle, are unambiguously known. We have also used our HST data to determine the distance to V838 Mon through a novel geometric technique. Because of the extreme rarity of light echoes, this program of regular monitoring provides the only opportunity to achieve such results during the HST lifetime. We propose WFPC2 imaging in late 2008/early 2009, in order to continue the mapping of the circumstellar dust and to accomplish the other goals listed above.
This is a 14-orbit DD program for imaging of the light echo around V838 Mon with the WFPC2. Images will be taken in broad-band V (F606W). We will use 2 pointings of 7 orbits each, with dithering, to cover nearly the entire echo. The observations should be done before the end of the target visibility season in early 2009. ISM AND CIRCUMSTELLAR MATTER 0 false 0.0 0.0 false false false false false SUPPORTED ISM EJECTA PLANETARY NEBULA REFLECTION NEBULA WIND Geometric center of light echo, based on ACS images obtained in September 2006. J2000 07 04 4.8000 -03 50 50.00 J2000 WFPC2 Imaging No F606W The scheduling data was generated by CASM 17.2. 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