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Confirmation of New Planetary Nebulae in the Large Magellanic Cloud
Parker, Quentin A.; Reid, Warren A.; Shaw, Richard A.
We present Hubble Space Telescope (HST) images of new planetary nebulae (PNe) that were discovered in the Reid-Parker Anglo-Australian Observatory/UK Schmidt Telescope Hα survey of the Large Magellanic Cloud. These serendipitous observations from various HST programs yield independent confirmations of six PNe; one other detected nebula may also be…
FCAPT uvby Photometry of the mCP Stars HD 16545, HD 93226, HR 7575, and HR 8206
Adelman, Saul J.
The Four College Automated Photoelectric Telescope (FCAPT) obtained differential Strömgren uvby observations of the magnetic CP (mCP) stars HD 16545, HD 93226, HR 7575, and HR 8206. These are the first reported from the FCAPT. HD 16545, with its largest amplitudes (0.06 mag) being those in v and in b, has a period of 1.61926 days, close to its per…
Hubble Space Telescope Far-Ultraviolet Spectroscopy of the Dwarf Nova VW Hydri in Superoutburst
Sion, Edward M.; Merritt, Jason; Night, Christopher
We obtained three consecutive Hubble Space Telescope spectroscopic observations of a single superoutburst of the dwarf nova VW Hydri. The spectra cover the beginning, middle, and end of the superoutburst. All of the spectra are dominated by strong absorption lines due to C III (1175 Å), Lyα (1216 Å), N IV (1238 and 1242 Å), S II (1260-1565 Å), S I…
Crowded-Field Astrometry with SIM PlanetQuest. I. Estimating the Single-Measurement Astrometric Bias Arising from Confusion
Sridharan, R.; Allen, Ronald J.
The accuracy of position measurements of stellar targets with the future Space Interferometry Mission PlanetQuest (SIM) will be limited not only by photon noise and by the properties of the instrument (design, stability, etc.) and the overall measurement program (observing strategy, reduction methods, etc.), but also by the presence of other "conf…
Revised Periods for QS Geminorum and V367 Geminorum
Brown, Peter J.; Hintz, Eric G.
We have examined the field around the variable stars QS Geminorum and V367 Geminorum. For the δ Scuti-type variable QS Gem, we determined a revised period of 0.1346116 days, which is close to the originally published period from Hipparcos. For the eclipsing system V367 Gem, we found a period of 0.6992285 days, which is substantially different from…