15 research outputs found
Is Kelly Shifting Under Google’s Feet? New Ninth Circuit Impact on the Google Library Project Litigation
The Google Library Project presents what many consider to be the perfect fair-use problem. The legal debate surrounding the Library Project has centered on the Ninth Circuit’s Kelly v. Arriba Soft. Yet recent case law presents new arguments for both sides of the Library Project litigation. This iBrief analyzes two Ninth Circuit district court decisions on fair use, Field v. Google, Inc. and Perfect 10 v. Google, Inc., and their impact on the Library Project litigation
The Palomar Testbed Interferometer Calibrator Catalog
The Palomar Testbed Interferometer (PTI) archive of observations between 1998
and 2005 is examined for objects appropriate for calibration of optical
long-baseline interferometer observations - stars that are predictably
point-like and single. Approximately 1,400 nights of data on 1,800 objects were
examined for this investigation. We compare those observations to an
intensively studied object that is a suitable calibrator, HD217014, and
statistically compare each candidate calibrator to that object by computing
both a Mahalanobis distance and a Principal Component Analysis. Our hypothesis
is that the frequency distribution of visibility data associated with
calibrator stars differs from non-calibrator stars such as binary stars.
Spectroscopic binaries resolved by PTI, objects known to be unsuitable for
calibrator use, are similarly tested to establish detection limits of this
approach. From this investigation, we find more than 350 observed stars
suitable for use as calibrators (with an additional being
rejected), corresponding to sky coverage for PTI. This approach
is noteworthy in that it rigorously establishes calibration sources through a
traceable, empirical methodology, leveraging the predictions of spectral energy
distribution modeling but also verifying it with the rich body of PTI's on-sky
observations.Comment: 100 pages, 7 figures, 7 tables; to appear in the May 2008ApJS, v176n
The Hamburg/ESO R-process Enhanced Star survey (HERES)
Aims.The aim of this study is a detailed abundance analysis of the newly
discovered r-rich star HE 1405 0822, which has [Fe=H]=-2.40. This star shows
enhancements of both r- and s-elements, [Ba/Fe]= +1.95 and [Eu/Fe]=1.54, for
which reason it is called r+s star. Methods.Stellar parameters and element
abundances were determined by analying high-quality VLT/UVES spectra. We used
Fe I line excitation equilibria to derive the effective temperature. The
surface gravity was calculated from the Fei/Feii and Ti I/Ti II equilibria.
Results.We determined accurate abundances for 39 elements, including 19
neutron-capture elements. HE 1405-0822 is a red giant. Its strong enhancements
of C, N, and s-elements are the consequence of enrichment by a former AGB
companion with an initial mass of less than 3 M_Sun. The heavy n-capture
element abundances (including Eu, Yb, and Hf) seen in HE 1405-0822 do not agree
with the r-process pattern seen in strongly r-process-enhanced stars. We
discuss possible enrichment scenarios for this star. The enhanced alpha
elements can be explained as the result of enrichment by supernovae of type II.
Na and Mg may have partly been synthesized in a former AGB companion, when the
primary 22^Ne acted as a neutron poison in the 13^C-pocket.Comment: Accepted for publication in Astronomy & Astrophysics,16 pages, 3
figures, 6 table