Bulletin of the American Physical Society
Annual Meeting of the Four Corners Section of the APS
Volume 57, Number 11
Friday–Saturday, October 26–27, 2012; Socorro, New Mexico
Session J2: High Resolution Studies of the Sun and Stars II |
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Chair: Robert Stencel, University of Denver Room: Macey Center Copper |
Saturday, October 27, 2012 1:30PM - 1:54PM |
J2.00001: Precision Astrophysics Experiments with the Kepler Satellite Invited Speaker: Jason Jackiewicz Long photometric observations from space of tens of thousands of stars, such as those provided by Kepler, offer unique opportunities to carry out ensemble astrophysics as well as detailed studies of individual objects. One of the primary tools at our disposal for understanding pulsating stars is asteroseismology, which uses observed stellar oscillation frequencies to determine interior properties. This can provide very strict constraints on theories of stellar evolution, structure, and the population characteristics of stars in the Milky Way galaxy. This talk will focus on several of the exciting insights Kepler has enabled through asteroseismology of stars across the H-R diagram. [Preview Abstract] |
Saturday, October 27, 2012 1:54PM - 2:06PM |
J2.00002: A study of the properties of small-scale magnetic features in a simulated Sun Eric Ramesh We plan to carry out a statistical study of the properties of small-scale magnetic structures seen in the simulation of solar atmosphere. The 3D Magnetohydrodynamic (MHD) simulation spanning 2 hours with a cadence of 30 seconds is available for analysis. As a first step, we will identify regions of strong magnetic field strength and track them over the entire span of the simulation. Each magnetic structure will be labeled and its positions will be recorded for each snapshot of the simulation. We will then estimate the total area covered, magnetic field-strength, lifetime and other properties of these individual structures. Along with these properties and the average number density of the magnetic structures, we can estimate the magnetic energy present in the small-scale features. The distribution of the sizes, field strength and lifetimes obtained using the simulated data will be compared with observational data of Magnetic Bright Points (MBPs) to evaluate the simulated Sun. [Preview Abstract] |
Saturday, October 27, 2012 2:06PM - 2:18PM |
J2.00003: Solar Active Longitudes Resulting from Thin Flux Tube Simulations in a Solar-like Convective Envelope Maria Weber, Yuhong Fan, Mark Miesch Solar observations show that the emergence of active features is distributed inhomogeneously in longitude according to sunspot activity, solar x-ray flares, and coronal streamers. In addition, an asymmetry exists between active region associated phenomena in the Northern and Southern hemispheres. Using a thin flux tube model in a rotating spherical shell of solar-like convective flows, we find that these simulated flux tubes tend to emerge asymmetrically in number in the Northern and Southern hemispheres, and emerge at preferred longitudes. The active longitudes our simulations produce often span across the equator between low latitudes of 15 degrees to -15 degrees, and persist and propagate prograde for multiple solar rotation periods. We suggest that the active longitudes in our simulation are the result of columnar, rotationally aligned giant cells present in the convection simulation at low latitudes. If giant convecting cells exist in the bulk of the solar convection zone, this phenomenon could in part provide an explanation for the North/South asymmetry of active region emergence as well as active longitudes. [Preview Abstract] |
Saturday, October 27, 2012 2:18PM - 2:30PM |
J2.00004: An account of the discovery of two un-cataloged variable stars on the KOI 1152 field during the summer of 2012 as part of the REU program at Brigham Young University Pamela Lara, Mike D. Joner While reviewing the graphs depicting the changes in magnitude for several stars this researcher came across two very interesting light curves. These curves showed increases and decreases in luminosity with a periodicity proper of eclipsing binary star systems, group that belongs to the extrinsic variable family of the variable stars classification (1). The finding of the stars was incredibly exciting but what made the discovery even more thrilling was the fact that there was no information available nor evidence of previous studies conducted on the subjects. The data was obtained from several nights of observation using the 0.32-m and the 0.91-m telescopes at West Mountain Observatory -property of BYU- and analyzed, processed and reduced using the differential photometry technique and the IRAF incorporated system. [Preview Abstract] |
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