856 research outputs found
The Celestial Railroad to Juno
The topic of this paper is deeply and affectionately imbedded in the early history and folklore of northern Dade County and present day Palm Beach County. Until this present undertaking no attempt at a comprehensive article about the Celestial Railroad has been made. Stray references and short descriptions are found in a wide variety of places but the best of these are in unpublished reminiscences of old-timers and in contemporary newspapers which are not readily accessible to general readers
Zangara\u27s Attempted Assassination of Franklin D. Roosevelt
A communitiy\u27s moment in history is not usually of its own choosing but comes as some unwanted thing which can be embarrassing and completely frightening. Such was the unhappy fate of Miami on the evening of February 15, 1933 when Giuseppe Zangara tried to assassinate President-elect Franklin D. Roosevelt with an $8.00 pistol. The attempt failed but Mayor Anton J. Cermak of Chicago died from a bullet wound. And Zangara was electrocuted for his crime
Detections and Constraints on White Dwarf Variability from Time-Series GALEX Observations
We search for photometric variability in more than 23,000 known and candidate
white dwarfs, the largest ultraviolet survey compiled for a single study of
white dwarfs. We use gPhoton, a publicly available calibration/reduction
pipeline, to generate time-series photometry of white dwarfs observed by GALEX.
By implementing a system of weighted metrics, we select sources with
variability due to pulsations and eclipses. Although GALEX observations have
short baselines (< 30 min), we identify intrinsic variability in sources as
faint as Gaia G = 20 mag. With our ranking algorithm, we identify 49 new
variable white dwarfs (WDs) in archival GALEX observations. We detect 41 new
pulsators: 37 have hydrogen-dominated atmospheres (DAVs), including one
possible massive DAV, and four are helium-dominated pulsators (DBVs). We also
detect eight new eclipsing systems; five are new discoveries, and three were
previously known spectroscopic binaries. We perform synthetic injections of the
light curve of WD 1145+017, a system with known transiting debris, to test our
ability to recover similar systems. We find that the 3{\sigma} maximum
occurrence rate of WD 1145+017-like transiting objects is < 0.5%.Comment: 17 pages, 13 figure
Gone But Not Forgotten: The HST Non-Detection of SN Ia 2011fe 11.5yr After Explosion Further Restricts Single-Degenerate Progenitor Systems
We present deep Hubble Space Telescope imaging of the nearby Type Ia
supernova (SN Ia) 2011fe obtained 11.5yr after explosion. No emission is
detected at the SN location to a () limit of mag, or equivalently mag, neglecting the
distance uncertainty to M101. We constrain the presence of donor stars impacted
by the SN ejecta with the strictest limits thus far on compact (i.e., ) companions. H-rich zero-age main-sequence companions with masses
are excluded, a significant improvement upon the
pre-explosion imaging limit of . Main-sequence He stars
with masses and subgiant He stars with masses are also disfavored by our late-time imaging. Synthesizing our
limits on post-impact donors with previous constraints from pre-explosion
imaging, early-time radio and X-ray observations, and nebular-phase
spectroscopy, essentially all formation channels for SN2011fe invoking a
non-degenerate donor star at the time of explosion are unlikely.Comment: 5 pages excluding references, 4 figures, 1 table. Submitted to ApJ
Optical observations of the luminous Type IIn Supernova 2010jl for over 900 days
The luminous Type IIn Supernova (SN) 2010jl shows strong evidence for the
interaction of the SN ejecta with dense circumstellar material (CSM). We
present observations of SN 2010jl for d after its earliest
detection, including a sequence of optical spectra ranging from to
d. We also supplement our late time spectra and the photometric
measurements in the literature with an additional epoch of new, late time
photometry. Combining available photometric and spectroscopic data, we
derive a semi-bolometric optical light curve and calculate a total radiated
energy in the optical for SN 2010jl of erg. We also
examine the evolution of the H emission line profile in detail and find
evidence for asymmetry in the profile for d that is not easily
explained by any of the proposed scenarios for this fascinating event. Finally,
we discuss the interpretations from the literature of the optical and
near-infrared light curves, and propose that the most likely explanation of
their evolution is the formation of new dust in the dense, pre-existing CSM
wind after d.Comment: 14 pages, 10 figures, 5 tables. Full version of Table 3 is included
as an ancillary fil
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