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Optical Spectroscopy of a Flare on Barnard's Star
D. Paulson, J. Allred, R. Anderson +3
We present optical spectra of a flare on Barnard's star. Several photospheric as well as chromospheric species were enhanced by the flare heating. An analysis of the Balmer lines s…
The Radio Spectrum of TVLM513-46546: Constraints on the Coronal Properties of a Late M Dwarf
Rachel A. Osten, Suzanne L. Hawley, Timothy S. Bastian +1
We explore the radio emission from the M9 dwarf, TVLM513-46546, at multiple radio frequencies, determining the flux spectrum of persistent radio emission, as well as constraining t…
Investigating the Late Stages of Stellar Evolution with Long Period Variables from MACHO and 2MASS
Oliver J. Fraser, Suzanne L. Hawley, Kem H. Cook
We are re-analyzing the MACHO variable star database to explore the relationships between pulsation, evolution, and mass loss in evolved stars. We will analyze the multi-periodic p…
Testing LMC Microlensing Scenarios: The Discrimination Power of the SuperMACHO Microlensing Survey
A. Rest, C. Stubbs, A. C. Becker +18
Characterizing the nature and spatial distribution of the lensing objects that produce the previously measured microlensing optical depth toward the Large Magellanic Cloud (LMC) re…
The Fourth Data Release of the Sloan Digital Sky Survey
J. K. Adelman-McCarthy et al.
This paper describes the fourth data release of the Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through June 2004. The data release includes five-band…
Radiative Hydrodynamic Models of the Optical and Ultraviolet Emission from Solar Flares
J. C. Allred, S. L. Hawley, W. P. Abbett +1
We report on radiative hydrodynamic simulations of moderate and strong solar flares. The flares were simulated by calculating the atmospheric response to a beam of non-thermal elec…
Updated Colors for Cool Stars in the SDSS
Andrew A. West, Lucianne M. Walkowicz, Suzanne L. Hawley
We present updated colors for M and L dwarfs based on photometry from the third data release of the Sloan Digital Sky Survey (SDSS). These data are improved in quality and number f…
The Fall 2004 SDSS Supernova Survey
Masao Sako, Roger Romani, Josh Frieman +38
In preparation for the Supernova Survey of the Sloan Digital Sky Survey (SDSS) II, a proposed 3-year extension to the SDSS, we have conducted an early engineering and science run d…
The Magnetic Properties of an L Dwarf Derived from Simultaneous Radio, X-ray, and H-alpha Observations
E. Berger, R. E. Rutledge, I. N. Reid +12
We present the first simultaneous, multi-wavelength observations of an L dwarf, the L3.5 candidate brown dwarf 2MASS J00361617+1821104, conducted with the Very Large Array, the Cha…
The Chromospheric Activity and Ages of M Dwarf Stars in Wide Binary Systems
Nicole M. Silvestri, Suzanne L. Hawley, Terry D. Oswalt
We investigate the relationship between age and chromospheric activity for 139 M dwarf stars in wide binary systems with white dwarf companions. The age of each system is determine…