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Stars, Interstellar Medium and the Galaxy Commons™

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2018

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Articles 61 - 66 of 66

Full-Text Articles in Stars, Interstellar Medium and the Galaxy

Solar Eclipse, 2017 (Sc 3152), Manuscripts & Folklife Archives Jan 2018

Solar Eclipse, 2017 (Sc 3152), Manuscripts & Folklife Archives

Manuscript Collection Finding Aids

Finding aid only for Manuscripts Small Collection 3152. Materials relating to the 2017 solar eclipse as experienced primarily in Bowling Green and Hopkinsville, Kentucky and vicinity. Includes viewing glasses, first day stamped covers, stickers, art work, photographs (in digital format), promotional materials, and impressions of the eclipse contributed as part of WKU’s Department of Library Special Collections’ “Tell Us About Your Eclipse Day” project. Also includes wristbands, handouts and volunteer information relating to an eclipse viewing event for schoolchildren held at WKU’s Smith-Houchens Stadium. Digital photographs are stored in the Photo Archives.

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Differential Rotation In Magnetic Chemically Peculiar Stars, Zdeněk Mikulášek, Jiří Krtička, Ernst Paunzen, Michal Švanda, Stefan Hummerich, Klaus Bernhard, Miroslav Jagelka, Jan Janík, Gregory W. Henry, Matthew E. Shultz Jan 2018

Differential Rotation In Magnetic Chemically Peculiar Stars, Zdeněk Mikulášek, Jiří Krtička, Ernst Paunzen, Michal Švanda, Stefan Hummerich, Klaus Bernhard, Miroslav Jagelka, Jan Janík, Gregory W. Henry, Matthew E. Shultz

Information Systems and Engineering Management Research Publications

Magnetic chemically peculiar (mCP) stars constitute about 10% of upper-main-sequence stars and are characterized by strong magnetic fields and abnormal photospheric abundances of some chemical elements. Most of them exhibit strictly periodic light, magnetic, radio, and spectral variations that can be fully explained by a rigidly rotating main-sequence star with persistent surface structures and a stable global magnetic field. Long-term observations of the phase curves of these variations enable us to investigate possible surface differential rotation with unprecedented accuracy and reliability. The analysis of the phase curves in the best-observed mCP stars indicates that the location and the contrast of …

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Effects Of Mass And Distance Uncertainties On Calculations Of Flux From Giant Molecular Clouds, Matt Coel Jan 2018

Effects Of Mass And Distance Uncertainties On Calculations Of Flux From Giant Molecular Clouds, Matt Coel

Dissertations, Master's Theses and Master's Reports

It is assumed that the distribution of the Milky Way cosmic rays, the cosmic ray ‘sea,’ is even throughout the Galaxy. This assumption can be tested by measuring gamma rays produced from cosmic ray interactions with Giant Molecular Clouds. The gamma ray flux depends on the mass and distance of a given molecular cloud as well as the cosmic ray flux in its vicinity. Thus a predicted gamma ray flux can be compared to actual flux data from a detector. Uncertainties from measuring the mass of and distance to the clouds are taken into account for this prediction. This report …

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Study Of The Cygnus Region With Fermi And Hawc, Andrew Robare Jan 2018

Study Of The Cygnus Region With Fermi And Hawc, Andrew Robare

Dissertations, Master's Theses and Master's Reports

The Cygnus Cocoon is an extended source of high-energy gamma-ray emission in the Cygnus region. The gamma-ray emission has been attributed to a volume 50pc in diameter of freshly-accelerated particles near the Supernova Remnant γ Cygni which is located 1.4kpc from the solar system [Ackermann et al., 2011], [Tibaldo et al., 2013]. Since its discovery in 2011, Fermi LAT has improved their event reconstruction to allow analysis at higher energies, and recorded six additional years of data. An analysis was performed on the entire dataset to reproduce the previous results, then expand on them with higher energies and larger time …

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Multi-Telescope Radio Observations For Low Frequency Gravitational Wave Astrophysics, Megan L. Jones Jan 2018

Multi-Telescope Radio Observations For Low Frequency Gravitational Wave Astrophysics, Megan L. Jones

Graduate Theses, Dissertations, and Problem Reports (ETD)

The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) has the principal goal of detecting gravitational waves (GWs) in the nanohertz part of the spectrum using pulsar timing. This thesis presents results from radio campaigns at frequencies from 322 MHz to 10 GHz aimed at both multi-messenger constraints on GW sources and improving the timing sensitivity. The primary expected source of GWs at the nanohertz frequencies to which pulsar timing is sensitive are supermassive black hole (SMBH) binaries. We investigate a purported SMBH displaced from the galactic photocenter in NGC 3115. We explore the possibilities that the source is a …

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Rr Lyrae Calibration Using Sdss, Single-Epoch Spectroscopy, Stacy Long Jan 2018

Rr Lyrae Calibration Using Sdss, Single-Epoch Spectroscopy, Stacy Long

Theses and Dissertations--Physics and Astronomy

I use single-epoch, SDSS spectroscopy of RR Lyraes identified in the Catalina survey to separate the spectra into same-temperature groups. Then I draw temperature-phase diagrams of the groups. I find shocked stars, improperly phased stars, low amplitude stars, and a few that are more likely eclipsing binaries. The RR Lyraes are then given precise metallicities by measurements of the CaII K and H-β, H-γ, and H-δ lines. This leads to better distance measurements, which allow me to confirm a distinction between the inner and outer galactic halo.

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