Matthew N. Beasley

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High resolution spectroscopy is the foundation for many challenging astronomical observations. A highly precise, repeatable and stable wavelength calibration is especially essential for long term radial velocity observations. The two wavelength references in wide use for visible wavelengths, iodine absorption cells and thorium/argon lamps, each have(More)
We present optical and near-infrared photometry and spectroscopy of the type Ia SN 1998bu in the Leo I Group galaxy M96 (NGC 3368). The data set consists of 356 photometric measurements and 29 spectra of SN 1998bu between UT 1998 May 11 and July 15. The well-sampled light curve indicates the supernova reached maximum light in B on UT 1998 May 19.3 (JD(More)
We present new far-ultraviolet spectra of an oxygen-rich knot in the Large Magellanic Cloud supernova remnant N132D, obtained with the Hubble Space T elescope-Cosmic Origins Spectrograph. Moderate resolution (∆v ≈ 200 km s) spectra in the HST far-ultraviolet bandpass (1150 . λ . 1750 Å) show emission from several ionization states of oxygen as well as trace(More)
We have developed a new family of imaging spectrometer designs that combine the imaging power of two-element telescopes with the aberration control of first-generation holographic gratings. The resulting optical designs provide high spatial resolution over modest fields of view at selectable wavelengths. These all-reflective designs are particularly suited(More)
We present an imaging spectrometer developed for narrowband imaging at 1035 A with high (approximately 1-arc sec) spatial resolution over a modest field of view (approximately 5 arc min). The instrument is based on a conventional Gregorian telescope with aberration-corrected holographic rulings on the secondary optic. These aberration-correcting rulings(More)
We present new far-ultraviolet (far-UV) spectra of an oxygen-rich knot in the Large Magellanic Cloud supernova remnant N132D, obtained with the Hubble Space Telescope (HST)-Cosmic Origins Spectrograph (COS). Moderateresolution (Δv ≈ 200 km s−1) spectra in the HST far-UV bandpass (1150 Å λ 1750 Å) show emission from several ionization states of oxygen as(More)
The Star Formation Camera (SFC) is a wide-field (~19'×15', >280 arcmin), high-resolution (18 mas pixels) UV/optical dichroic camera designed for the Theia 4-m space-borne space telescope concept. SFC will deliver diffraction-limited images at λ > 300 nm in both a blue (190-517nm) and a red (517-1075nm) channel simultaneously. The goal is to conduct a(More)
We have designed, assembled, and launched a sounding rocket payload to perform high-resolution far-ultraviolet spectroscopy. The instrument is functionally a Cassegrain telescope followed by a modified Rowland spectrograph. The spectrograph was designed to achieve a resolving power (R=λ/δλ) of 60,000 in a compact package by adding a magnifying secondary(More)
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