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New Circumstellar Dust Creation in V838 Monocerotis
John P. Wisniewski, Mark Clampin, Karen S. Bjorkman +2
We report high spatial resolution 11.2 and 18.1 micron imaging of the eruptive variable V838 Monocerotis, obtained with Gemini Observatory's Michelle in 2007 March. The 2007 flux d…
The HD 163296 Circumstellar Disk in Scattered Light: Evidence of Time-Variable Self-Shadowing
John P. Wisniewski, Mark Clampin, Carol A. Grady +6
We present the first multi-color view of the scattered light disk of the Herbig Ae star HD 163296, based on coronagraphic observations from the Hubble Space Telescope Advanced Came…
High Spatial Resolution Mid-IR Imaging of V838 Monocerotis: Evidence of New Circumstellar Dust Creation
John P. Wisniewski, Mark Clampin, Karen S. Bjorkman +1
We report high spatial resolution 11.2 and 18.1 micron imaging of V838 Monocerotis obtained with Gemini Observatory's Michelle instrument in 2007 March. Strong emission is observed…
Milliarcsecond N-Band Observations of the Nova RS Ophiuchi: First Science with the Keck Interferometer Nuller
R. K. Barry, W. C. Danchi, W. A. Traub +38
We report observations of the nova RS Ophiuchi (RS Oph) using the Keck Interferometer Nuller (KIN), approximately 3.8 days following the most recent outburst that occurred on 2006…
Discovery of a New Dusty B[e] Star in the Small Magellanic Cloud
John P. Wisniewski, Karen S. Bjorkman, Jon E. Bjorkman +1
We present new optical spectroscopic and archival Spitzer IRAC photometric observations of a B-type star in the SMC cluster NGC 346, NGC 346:KWBBe 200. We detect numerous Fe II, [O…
The Magnetic Field Structure of the LMC 2 Supershell: NGC 2100
John P. Wisniewski, Karen S. Bjorkman, Antonio M. Magalhaes +2
We present U,B,V,R,I imaging polarimetry of NGC 2100 and its surrounding environment, which comprise a part of the LMC 2 supershell. The morphology of the observed position angle d…
The Role of Evolutionary Age and Metallicity in the Formation of Classical Be Circumstellar Disks I. New Candidate Be Stars in the LMC, SMC, and Milky Way
John P. Wisniewski, Karen S. Bjorkman, ;
We present B, V, R, and H alpha photometry of 8 clusters in the Small Magellanic Cloud, 5 in the Large Magellanic Cloud, and 3 Galactic clusters, and use 2 color diagrams (2-CDs) t…
The Spectropolarimetric Evolution of V838 Monocerotis
John P. Wisniewski
I review photo-polarimetric and spectropolarimetric observations of V838 Mon, which revealed that it had an asymmetrical inner circumstellar envelope following its 2nd photometric…
The Asymmetrical Wind of the Candidate Luminous Blue Variable MWC 314
J. P. Wisniewski, B. L. Babler, K. S. Bjorkman +3
We present the results of long-term spectropolarimetric and spectroscopic monitoring of MWC 314, a candidate Luminous Blue Variable star. We detect the first evidence of H varia…
Evolution of the Inner Circumstellar Envelope of V838 Monocerotis
John P. Wisniewski, Karen S. Bjorkman, Antonio M. Magalhaes
We present imaging polarimetry observations of the eruptive variable V838 Monocerotis and its neighboring field obtained in 2002 October. The polarization of field stars confirms t…
Spectroscopic and Spectropolarimetric Observations of V838 Mon
John P. Wisniewski, Nancy D. Morrison, Karen S. Bjorkman +5
The spectroscopic and spectropolarimetric variability of the peculiar variable V838 Monocerotis during the brighter phases of its multiple outbursts in 2002 is presented. Significa…
Ultraviolet and visible spectropolarimetric variability in P Cygni
K. H. Nordsieck, J. Wisniewski, B. L. Babler +9
We report on new data, including four vacuum ultraviolet spectropolarimetric observations by the Wisconsin Ultraviolet Photo-Polarimeter Experiment ("WUPPE") on the Astro-1 (one ob…