44 research outputs found
Executive Power in Theory and Practice
Since September 11, 2001, long-standing debates over the nature and proper extent of executive power have assumed a fresh urgency. What is executive power? When did it first emerge, and why? And what is the role of the executive within the American regime? In this book, eleven leading scholars of American politics and political theory address these and related questions, in essays on topics ranging from Aristotle and the Roman Republic to the presidencies of George W. Bush and Barack Obama.https://scholarship.richmond.edu/bookshelf/1051/thumbnail.jp
The Ages of the Thin Disk, Thick Disk, and the Halo from Nearby White Dwarfs
We present a detailed analysis of the white dwarf luminosity functions
derived from the local 40 pc sample and the deep proper motion catalog of Munn
et al (2014, 2017). Many of the previous studies ignored the contribution of
thick disk white dwarfs to the Galactic disk luminosity function, which results
in an erronous age measurement. We demonstrate that the ratio of thick/thin
disk white dwarfs is roughly 20\% in the local sample. Simultaneously fitting
for both disk components, we derive ages of 6.8-7.0 Gyr for the thin disk and
8.7 0.1 Gyr for the thick disk from the local 40 pc sample. Similarly, we
derive ages of 7.4-8.2 Gyr for the thin disk and 9.5-9.9 Gyr for the thick disk
from the deep proper motion catalog, which shows no evidence of a deviation
from a constant star formation rate in the past 2.5 Gyr. We constrain the time
difference between the onset of star formation in the thin disk and the thick
disk to be Gyr. The faint end of the luminosity function
for the halo white dwarfs is less constrained, resulting in an age estimate of
Gyr for the Galactic inner halo. This is the first time
ages for all three major components of the Galaxy are obtained from a sample of
field white dwarfs that is large enough to contain significant numbers of disk
and halo objects. The resultant ages agree reasonably well with the age
estimates for the oldest open and globular clusters.Comment: ApJ, in pres
The Ages of the Thin Disk, Thick Disk, and the Halo from Nearby White Dwarfs
We present a detailed analysis of the white dwarf luminosity functions derived from the local 40 pc sample and the deep proper motion catalog of Munn et al. (2014, 2017). Many of the previous studies ignored the contribution of thick disk white dwarfs to the Galactic disk luminosity function, which results in an erronous age measurement. We demonstrate that the ratio of thick/thin disk white dwarfs is roughly 20% in the local sample. Simultaneously fitting for both disk components, we derive ages of 6.8-7.0 Gyr for the thin disk and 8.7 ± 0.1 Gyr for the thick disk from the local 40 pc sample. Similarly, we derive ages of 7.4-8.2 Gyr for the thin disk and 9.5-9.9 Gyr for the thick disk from the deep proper motion catalog, which shows no evidence of a deviation from a constant star formation rate in the past 2.5 Gyr. We constrain the time difference between the onset of star formation in the thin disk and the thick disk to be 1.6 +0.3â0.4 Gyr. The faint end of the luminosity function for the halo white dwarfs is less constrained, resulting in an age estimate of 12.5 +1.4â3.4 Gyr for the Galactic inner halo. This is the first time ages for all three major components of the Galaxy are obtained from a sample of field white dwarfs that is large enough to contain significant numbers of disk and halo objects. The resultant ages agree reasonably well with the age estimates for the oldest open and globular clusters
A Catalog of Spectroscopically Confirmed White Dwarfs from the Sloan Digital Sky Survey Data Release 4
We present a catalog of 9316 spectroscopically confirmed white dwarfs from
the Sloan Digital Sky Survey Data Release 4. We have selected the stars through
photometric cuts and spectroscopic modeling, backed up by a set of visual
inspections. Roughly 6000 of the stars are new discoveries, roughly doubling
the number of spectroscopically confirmed white dwarfs. We analyze the stars by
performing temperature and surface gravity fits to grids of pure hydrogen and
helium atmospheres. Among the rare outliers are a set of presumed helium-core
DA white dwarfs with estimated masses below 0.3 Msun, including two candidates
that may be the lowest masses yet found. We also present a list of 928 hot
subdwarfs.Comment: Accepted by the Astrophysical Journal Supplements, 25 pages, 24
figures, LaTeX. The electronic catalog, as well as diagnostic figures and
links to the spectra, is available at http://das.sdss.org/wdcat/dr4
Magnetic White Dwarfs from the SDSS II. The Second and Third Data Releases
Fifty-two magnetic white dwarfs have been identified in spectroscopic
observations from the Sloan Digital Sky Survey (SDSS) obtained between mid-2002
and the end of 2004, including Data Releases 2 and 3. Though not as numerous
nor as diverse as the discoveries from the first Data Release, the collection
exhibits polar field strengths ranging from 1.5MG to ~1000MG, and includes two
new unusual atomic DQA examples, a molecular DQ, and five stars that show
hydrogen in fields above 500MG. The highest-field example, SDSSJ2346+3853, may
be the most strongly magnetic white dwarf yet discovered. Analysis of the
photometric data indicates that the magnetic sample spans the same temperature
range as for nonmagnetic white dwarfs from the SDSS, and support is found for
previous claims that magnetic white dwarfs tend to have larger masses than
their nonmagnetic counterparts. A glaring exception to this trend is the
apparently low-gravity object SDSSJ0933+1022, which may have a history
involving a close binary companion.Comment: 20 pages, 4 figures Accepted for publication in the Astronomical
Journa
Additional Ultracool White Dwarfs Found in the Sloan Digital Sky Survey
We identify seven new ultracool white dwarfs discovered in the Sloan Digital
Sky Survey (SDSS). The SDSS photometry, spectra, and proper motions are
presented, and additional BVRI data are given for these and other previously
discovered ultracool white dwarfs. The observed colors span a remarkably wide
range, qualitatively similar to colors predicted by models for very cool white
dwarfs. One of the new stars (SDSS J1251+44) exhibits strong collision-induced
absorption (CIA) in its spectra, while the spectra and colors of the other six
are consistent with mild CIA. Another of the new discoveries (SDSS J2239+00A)
is part of a binary system -- its companion is also a cool white dwarf, and
other data indicate that the companion exhibits an infrared flux deficiency,
making this the first binary system composed of two CIA white dwarfs. A third
discovery (SDSS J0310-00) has weak Balmer emission lines. The proper motions of
all seven stars are consistent with membership in the disk or thick disk.Comment: Accepted for Astrophysical Journal. 16 pages (includes 3 figures
A Survey for Faint Stars of Large Proper Motion Using Extra Poss II Plates
We have conducted a search for new stars of high proper motion (0.4
arcsec yr) using POSS II fields for which an extra IIIaF (red) plate of
good quality exists, along with useable IIIaJ (blue) and IV-N (infrared) plates
taken at epochs differing by a minimum of 1.5 years. Thirty-five fields at
Galactic latitudes 20 were measured, covering some 1378 deg,
or 3.3% of the sky. Searches with three plate combinations as well as all four
plates were also made. Seven new stars were found with 0.5 arcsec
yr, which were therefore missed in the Luyten Half Second (LHS) Catalog.
One of these is a common proper motion binary consisting of two subdwarf M
stars; another is a cool white dwarf with probable halo kinematics. As a test
of our completeness -- and of our ability to test that of Luyten -- 216 of 230
catalogued high proper motion stars were recovered by the software, or 94%.
Reasons for incompleteness of the LHS are discussed, such as the simple fact
that POSS II plates have deeper limiting magnitudes and greater overlap than
did POSS I. Nonetheless, our results suggest that the LHS is closer to 90%
complete than recent estimates in the literature (e.g 60%), and we propose a
reason to account for one such lower estimate. The conclusion that the LHS
Catalog is more complete has implications for the nature of the halo dark
matter. In particular it strengthens the constraint on the local density of
halo stars, especially white dwarfs at M17-18.Comment: Astronomical Journal, in press, 16 pages, 3 figure
Discovery of New Ultracool White Dwarfs in the Sloan Digital Sky Survey
We report the discovery of five very cool white dwarfs in the Sloan Digital
Sky Survey (SDSS). Four are ultracool, exhibiting strong collision induced
absorption (CIA) from molecular hydrogen and are similar in color to the three
previously known coolest white dwarfs, SDSS J1337+00, LHS 3250 and LHS 1402.
The fifth, an ultracool white dwarf candidate, shows milder CIA flux
suppression and has a color and spectral shape similar to WD 0346+246. All five
new white dwarfs are faint (g > 18.9) and have significant proper motions. One
of the new ultracool white dwarfs, SDSS J0947, appears to be in a binary system
with a slightly warmer (T_{eff} ~ 5000K) white dwarf companion.Comment: 15 pages, 3 figures, submitted to ApJL. Higher resolution versions of
finding charts are available at
http://astro.uchicago.edu/~gates/findingchart
A Deep Proper Motion Catalog Within The Sloan Digital Sky Survey Footprint
A new proper motion catalog is presented, combining the Sloan Digital Sky
Survey (SDSS) with second epoch observations in the r band within a portion of
the SDSS imaging footprint. The new observations were obtained with the 90prime
camera on the Steward Observatory Bok 90 inch telescope, and the Array Camera
on the U.S. Naval Observatory, Flagstaff Station, 1.3 meter telescope. The
catalog covers 1098 square degrees to r = 22.0, an additional 1521 square
degrees to r = 20.9, plus a further 488 square degrees of lesser quality data.
Statistical errors in the proper motions range from 5 mas/year at the bright
end to 15 mas/year at the faint end, for a typical epoch difference of 6 years.
Systematic errors are estimated to be roughly 1 mas/year for the Array Camera
data, and as much as 2 - 4 mas/year for the 90prime data (though typically
less). The catalog also includes a second epoch of r band photometry.Comment: 14 pages, 17 figures, accepted for publication in the Astronomical
Journa