10,396 research outputs found
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
Ray Charles chante et joue le blues / Ray Charles, chant et piano
No full textComprend : EARLY IN THE MORNIN' : 2ème version / L. Hickman ; L. Jordan et D. Bartley - HARD TIMES / Ray Charles - THE MIDNIGHT HOUR / Sam Sweet - FEELIN' SAD / Eddie Jones - RAY'S BLUES / Ray Charles - ROCK HOUSE / Ray Charles - I WONDER WHO / Ray Charles - NOBODY CARES / Ray Charles - Mr Charles' blues / Ray Charles - SOME DAY BABY / Ray Charles - I BELIEVE TO MY SOUL : 2ème version / Ray Charles - A BIT OF SOUL / Ray CharlesBnF-Partenariats, Collection sonore - BelieveContient une table des matière
The Relative Pronoun d- and the Pronominal Suffixes in Mandaic, in Journal of Semitic Studies 52.1 (2007): 71–78 (Manchester)
No full textThe enclitic pronominal suffixes in Neo-Mandaic are affixed to nouns and prepositions via two separate strategies. Nearly all nouns and prepositions inherited directly from Classical Mandaic take pronominal suffixes directly. All loanwords, and an extremely circumscribed set of original Mandaic words, receive pronominal suffixes after an enclitic particle, –d-. Rudolph Macuch suggested in his Handbook of Classical and Modern Mandaic that this particle is derived from the Classical Mandaic relative pronoun, d-. The evidence, however, suggests that this particle is an innovation, which ultimately derives from the metathesis of the final two root consonants of Classical Mandaic qam / qadmia ‘to, for’ (Neo-Mandaic qam / qamdi-), from which it spread by analogy to new lexical items.This is a pre-copy-editing, author-produced PDF of an article accepted for publication in The Journal of Semitic Studies following peer review. The definitive publisher-authenticated version Charles G. Häberl. The Relative Pronoun ḏ- and the Pronominal Suffixes in MandaicJ Semitic Studies (2007) 52(1): 71-77 doi:10.1093/jss/fgl038 is available online at: http://jss.oxfordjournals.org/content/52/1/7
The nature of the X-ray transient MAXI J0556−332
No full textPhase-resolved spectroscopy of the newly discovered X-ray transient MAXIJ0556-332 has revealed the presence of narrow emission lines in the Bowen region that most likely arise on the surface of the mass donor star in this low-mass X-ray binary. A period search of the radial velocities of these lines provides two candidate orbital periods (16.43 ± 0.12 and 9.754 ± 0.048h), which differ from any potential X-ray periods reported. Assuming that MAXIJ0556-332 is a relatively high-inclination system that harbours a precessing accretion disc in order to explain its X-ray properties, it is only possible to obtain a consistent set of system parameters for the longer period. These assumptions imply a mass ratio of q≃ 0.45, a radial velocity semi-amplitude of the secondary of K 2≃ 190kms -1 and a compact object mass of the order of the canonical neutron star mass, making a black hole nature for MAXIJ0556-332 unlikely. We also report the presence of strong Niii emission lines in the spectrum, thereby inferring a high N/O abundance. Finally, we note that the strength of all emission lines shows a continuing decay over the ≃1 month of our observations
RoMEO Studies 6: Rights metadata for open-archiving
No full textThis is the final study in a series of six emanating from the UK JISC-funded RoMEO Project (Rights Metadata for Open-archiving) which investigated the Intellectual Property Rights (IPR) issues relating to academic author self-archiving of research papers. It reports the results of a survey of 542 academic authors showing the level of protection required for their open-access research papers. It then describes the selection of an appropriate means of expressing those rights through metadata and the resulting choice of Creative Commons licences. Finally it outlines proposals for communicating rights metadata via the Open Archives Initiative’s Protocol for Metadata Harvesting (OAI-PMH)
Ogilvie, Charles D., D.O.
No full textThe first chairman of the department of medical humanities at TCOM and professor of radiology, Dr. Ogilvie retired from the full-time faculty in 1981 to return to his role as a country doctor in East Texas. He shares his experiences at TCOM as chairman of the Curriculum Committee, including the activities of the Task Force on Educational Goals, which designed the current TCOM Goals Statement and fostered the college’s innovative health-oriented medical curriculum.
Interviewed by C. Ray Stokes, January 18, 198
Phase-resolved spectroscopy of the accreting millisecond X-ray pulsar SAX J1808.4-3658 during the 2008 outburst
No full textAims. We obtained phase-resolved spectroscopy of the accreting millisecond X-ray pulsar SAX J1808.4-3658 during its outburst in 2008 to find a signature of the donor star, constrain its radial velocity semi-amplitude (K2), and derive estimates for the pulsar mass.
Methods. Using Doppler images of the Bowen region, we find a significant (≥8σ) compact spot at a position where the donor star is expected. If this is a signature of the donor star, we measure Kem = 248 ± 20 km s−1 (1σ confidence), which represents a strict lower limit to K2. Also, the Doppler map of He II λ4686 shows the characteristic signature of the accretion disc, and there is a hint of
enhanced emission that may be a result of tidal distortions in the accretion disc that are expected in very low mass-ratio interacting binaries.
Results. The lower limit on K2 leads to a lower limit on the mass function of f (M1) ≥ 0.10 M. Applying the maximum K-correction gives 228 < K2 < 322 km s−1 and a mass ratio of 0.051 < q < 0.072.
Conclusions. Despite the limited S/N of the data, we were able to detect a signature of the donor star in SAXJ1808.4−3658, although future observations during a new outburst are still needed to confirm this. If the derived Kem is correct, the largest uncertainty in determining of the mass of the neutron star in SAXJ1808.4-3658 using dynamical studies lies with the poorly known inclination
A search for TeV gamma ray emission from X-ray binary stars
No full textThis work is concerned with the detection of pulsed TeV gamma ray emission from a number of X-ray binary systems by the use of the atmospheric Cerenkov technique. Chapters 1 and 2 give an overview of the development of gamma ray astronomy, with emphasis placed on progress made in the detection of TeV gamma rays by their Cerenkov radiation in the atmosphere. Chapters 3 and 4 describe the University of Durham atmospheric Cerenkov telescopes, which were used to make the observations reported in this work, and the standard data processing and analysis procedures adopted. The main part of the thesis deals with the application of these techniques to observations of five X-ray binaries. After a review of the properties of such objects in Chapter 5, Chapters 6 and 7 deal specifically with the results for two of the systems considered to be among the most likely candidates to give a detectable TeV photon flux; Centaurus X-3 and Vela X-1. A study of all data recorded on Cen X-3 over the course of six years suggests the presence of a weak gamma ray flux pulsed at the X-ray period. Previous reports of stronger emission near the ascending node of the orbit are confirmed here. For Vela X-1, the analysis of a dataset recorded during a single dark moon interval reveals evidence for two short outbursts of pulsed TeV gamma ray emission. Chapter 8 reports the series of observations made of SMC X-1, 4U1626-67 and X0G21-72, and upper limits are placed on the TeV gamma ray emission from each. Finally, the results reported here are compared with the predictions of a number of theoretical models, some of which are found to give good agreement with the limits and detections derived in this work. A discussion of the status of this field and future observational prospects is also given
Optical spectroscopy of the low-mass X-ray binary GX 9+9
No full textPhase-resolved medium-resolution VLT spectroscopy of the low-mass X-ray binary GX 9+9 has revealed narrow C ill emission lines that move in phase relative to our new estimate of the ephemeris, and show a velocity amplitude of 230 +/not superset of 35 km s(-1). We identify the origin of these lines as coming from the surface of the donor star, thereby providing the first estimate of the mass function of f(M-1) >= 0.22 M-circle dot. Rotational broadening estimates together with assumptions for the mass donor give 0.07 <= q <= 0.35 and 182 <= K-2 <= 406 km s(-1). Despite a low-mass ratio, there is no evidence for a superhump in our data set. Doppler maps of GX 9+9 show the presence of a stream overflow, either in the form of material flowing downward along the accretion disc rim or in a similar fashion as occurs in high mass transfer rate cataclysmic variables known as the SW Sex stars. Finally, we note that the Bowen region in GX 9+9 is dominated by C in instead of N III emission as has been the case for most other X-ray binaries
PHYSIOLOGY OF THE STEROLS, INCLUDING VITAMIN D
No full textCharles E. Bills. Physiology of the sterols, including vitamin D, 1935
Inscribed by the author.
Full texthttps://digitalcommons.rockefeller.edu/pamphlets-offprints-and-reprints/1009/thumbnail.jp
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