30,062 research outputs found
Abundances of Na, Sc, Cr, Mn, Fe, Co, and Cu in chondrules, Na, Mn, and Cu in meteorites, and In in meteoritic and terrestrial matter Quarterly progress report, 1 Dec. 1965 - 28 Feb. 1966
Element abundance in chondrules and meteorites measured by instrumental neutron activation analysis, and indium behavior in chondrite
Abundances of trace elements Na, Sc, Cr, Mn, Fe, Co, and Cu in chondrules and meteorites in IN meteorites and terrestrial matter and U in type I carbonaceous chondrites Quarterly progress report, 1 Mar. - 15 Jun. 1966
Abundances of sodium, scandium, chromium, iron, manganese, cobalt, copper, indium, and uranium in chondrules, chondrites, and meteorites determined by neutron activation analysi
Research on elemental abundances in meteoritic and terrestrial matter Summary progress report, 1 Sep. 1964 - 31 Aug. 1965
Element abundances determined by instrumental neutron activation analysis technique in individual chondrules separated from certain chondritic meteorite
Abundances of Na, Sc, Cr, Mn, Fe, Co, and Cu in 92 meteorites, 9 terrestrial specimens, and 90 individual chondrules Quarterly progress report, 1 Sep. - 30 Nov. 1963
Elemental abundancies in individual chondrules, chondrites and terrestrial matter, whole rock- type meteorites, and carbonaceous chondrite
Activation analysis for selected elements in micrometeorites and hypervelocity projectiles Annual progress report, 1 Jul. 1969 - 1 Jul. 1970
Activation analysis to identify materials for use as catcher for micrometeoroid
Rare Earth Abundances in Meteoritic Chondrules
Rare earth elements abundance in meteoritic chondrites determined by radiochemical neutron activation analysi
A Search for Lost Planets in the Kepler Multi-planet Systems and the Discovery of the Long-period, Neptune-sized Exoplanet Kepler-150 f
The vast majority of the 4700 confirmed planets and planet candidates
discovered by the Kepler mission were first found by the Kepler pipeline. In
the pipeline, after a transit signal is found, all data points associated with
those transits are removed, creating a "Swiss cheese"-like light curve full of
holes, which is then used for subsequent transit searches. These holes could
render an additional planet undetectable (or "lost"). We examine a sample of
114 stars with confirmed planets to evaluate the effect of this "Swiss
cheesing". A simulation determines that the probability that a transiting
planet is lost due to the transit masking is low, but non-negligible, reaching
a plateau at lost in the period range of days. We then
model all planet transits and subtract out the transit signals for each star,
restoring the in-transit data points, and use the Kepler pipeline to search the
transit-subtracted (i.e., transit-cleaned) light curves. However, the pipeline
did not discover any credible new transit signals. This demonstrates the
validity and robustness of the Kepler pipeline's choice to use transit masking
over transit subtraction. However, a follow-up visual search through all the
transit-subtracted data, which allows for easier visual identification of new
transits, revealed the existence of a new, Neptune-sized exoplanet (Kepler-150
f) and a potential single transit of a likely false positive (Kepler-208).
Kepler-150 f ( days, R)
is confirmed with confidence using a combination of the planet
multiplicity argument, a false positive probability analysis, and a transit
duration analysis.Comment: 11 pages, 5 figures, 2 tables. Accepted into A
Doubly Charmed Baryons in COMPASS
The search for doubly charmed baryons has been a topic for COMPASS from the
beginning. Requiring however a complete spectrometer and highest possible
trigger rates this measurement has been postponed. The scenario for such a
measurement in the second phase of COMPASS is outlined here. First studies of
triggering and simulation of the setup have been performed. New rate estimates
based on recent measurements from SELEX at FNAL are presented.Comment: 13 pages, 15 figures, contribution to the Workshop on Future Physics
at COMPASS, CERN, Geneva, September 26-27 2002, to appear as CERN Yellow
Repor
The Spectral Energy Distribution of Normal, Starburst and Active Galaxies
We present the results of an extensive literature search of multiwavelength
data for a sample of 59 galaxies, consisting of 26 Starbursts, 15 Seyfert 2's,
5 LINER's, 6 normal spirals and 7 normal elliptical galaxies. The data include
soft X-ray fluxes, ultraviolet and optical spectra, near, mid/far infrared
photometry and radio measurements, selected to match as closely as possible the
IUE aperture (10" X 20"). The galaxies are separated into 6 groups with similar
characteristics, namely, Ellipticals, Spirals, LINER's, Seyfert 2's, Starbursts
of Low and High reddening, for which we create average spectral energy
distributions (SED). The individual groups SED's are normalized to the
7000\AA flux and compared, looking for similarities and differences
among them.The bolometric fluxes of different types of galaxies were calculated
integrating their SED's. These values are compared with individual waveband
flux densities, in order to determine the wavebands which contribute most to
the bolometric flux. Linear regressions were performed between the bolometric
and individual band fluxes for each kind of galaxy. These fits can be used in
the calculation of the bolometric flux for other objects of similar activity
type, but with reduced waveband information. We have also collected
multiwavelength data for 4 HII regions, a thermal supernova remnant, and a
non-thermal supernova remnant (SNR), which are compared with the Starburst
SED's.Comment: 29 pages, 13 postscript figures and 10 tables. To appear in The
Astronomical Journa
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