51 research outputs found
Suzaku Observation of the Dwarf Nova V893 Scorpii: The Discovery of a Partial X-Ray Eclipse
V893 Sco is an eclipsing dwarf nova that had attracted little attention from X-ray astronomers until it was proposed as the identification of an RXTE all-sky slew survey (XSS) source. Here we report on the po inted X-ray observations of this object using Suzaku. We confirm V893 Sco to be X-ray bright, whose spectrum is highly absorbed for a dwar f nova. We have also discovered a partial X-ray eclipse in V893 Sco. This is the first time that a partial eclipse is seen in Xray light c urves of a dwarf nova. We have successfully modeled the gross features of the optical and X-ray eclipse light curves using a boundary layer geometry of the X-ray emission region. Future observations may lead to confirmation of this basic picture, and allow us to place tight co nstraints on the size of the X-ray emission region. The partial X-ray eclipse therefore should make V893 Sco a key object in understanding the physics of accretion in quiescent dwarf nova
The rapidly pulsating sdO star, SDSS J160043.6+074802.9
A spectroscopic analysis of SDSS J160043.6+074802.9, a binary system
containing a pulsating subdwarf-O (sdO) star with a late-type companion, yields
Teff = 70 000 +/- 5000 K and log g = 5.25 +/- 0.30, together with a most likely
type of K3V for the secondary star. We compare our results with atmospheric
parameters derived by Fontaine et al. (2008) and in the context of existing
evolution models for sdO stars. New and more extensive photometry is also
presented which recovers most, but not all, frequencies found in an earlier
paper. It therefore seems probable that some pulsation modes have variable
amplitudes. A non-adiabatic pulsation analysis of uniform metallicity sdO
models show those having log g > 5.3 to be more likely to be unstable and
capable of driving pulsation in the observed frequency range.Comment: 14 pages, 12 figures, accepted for publication in MNRAS, 2009
September
High speed photometry of faint Cataclysmic Variables - VII. Targets selected from the Sloan Digital Sky Survey and the Catalina Real-time Transient Survey
We present high speed photometric observations of 20 faint cataclysmic
variables, selected from the Sloan Digital Sky Survey and Catalina catalogues.
Measurements are given of 15 new directly measured orbital periods, including
four eclipsing dwarf novae (SDSS0904+03, CSS0826-00, CSS1404-10 and
CSS1626-12), two new polars (CSS0810+00 and CSS1503-22) and two dwarf novae
with superhumps in quiescence (CSS0322+02 and CSS0826-00). Whilst most of the
dwarf novae presented here have periods below 2 h, SDSS0805+07 and SSS0617-36
have relatively long orbital periods of 5.489 and 3.440 h, respectively. The
double humped orbital modulations observed in SSS0221-26, CSS0345-01,
CSS1300+11 and CSS1443-17 are typical of low mass transfer rate dwarf novae.
The white dwarf primary of SDSS0919+08 is confirmed to have non-radial
oscillations and quasi-periodic oscillations were observed in the short-period
dwarf nova CSS1028-08 during outburst. We further report the detection of a new
nova-like variable (SDSS1519+06). The frequency distribution of orbital periods
of CVs in the Catalina survey has a high peak near ~80 min orbital period,
independently confirming that found by Gaensicke et al (2009) from SDSS
sources. We also observe a marked correlation between the median in the orbital
period distribution and the outburst class, in the sense that dwarf novae with
a single observed outburst (over the 5-year baseline of the CRTS coverage)
occur predominantly at shortest orbital period.Comment: 17 pages, 38 figures, accepted for publication in MNRA
Development of intuitive rules: Evaluating the application of the dual-system framework to understanding children's intuitive reasoning
This is an author-created version of this article. The original source of publication is Psychon Bull Rev. 2006 Dec;13(6):935-53
The final publication is available at www.springerlink.com
Published version: http://dx.doi.org/10.3758/BF0321390
SDSS J160043.6+074802.9: a very rapid sdO pulsator
We report the serendipitous discovery of the Sloan Digital Sky Survey star,
SDSS J160043.6+074802.9 to be a very rapid pulsator. The variation is dominated
by a frequency near 8380 microHz (period = 119.33 s) with a large amplitude
(0.04 mag) and its first harmonic at 16760 microHz (59.66 s; 0.005 mag). In
between these frequencies, we find at least another 8 variations with periods
between 62 and 118 seconds and amplitudes between about 0.007 and 0.003 mag;
weaker oscillations might also be present. Preliminary spectrograms from the
performance verification phase of the Southern African Large Telescope indicate
that SDSS J160043.6+074802.9 is a spectroscopic binary consisting of an sdO
star and a late-type main-sequence companion. This makes it the first
unambiguous detection of such an sdO star to pulsate, and certainly the first
found to exhibit multi-frequency variations.Comment: 7 pages, 6 figures (figure 4 at reduced resolution, original
available on request). Accepted for publication in MNRA
Few Losses to Follow-up in a Sub-Saharan African Cancer Cohort via Active Mobile Health Follow-up
Accurate survival estimates are needed for guiding cancer control efforts in sub-Saharan Africa, but previous studies have been hampered by unknown biases due to excessive loss to follow-up (LTFU). In the African Breast Cancer-Disparities in Outcomes Study, a prospective breast cancer cohort study, we implemented active mobile health follow-up, telephoning each woman or her next-of-kin (NOK) trimonthly on her mobile phone to update information on her vital status. Dates of every contact with women/NOK were analyzed from diagnosis in 2014-2017 to the earliest of September 1, 2018, death, or 3 years postdiagnosis. The cumulative incidence of being LTFU was calculated considering deaths as competing events. In all, 1,490 women were followed for a median of 24.2 (interquartile range (IQR), 14.2-34.5) months, corresponding to 8,529 successful contacts (77% of total contacts) with the women/NOK. Median time between successful contacts was 3.0 (IQR, 3.0-3.7) months. In all, 71 women (5.3%) were LTFU at 3 years: 0.8% in Nigeria, 2.2% in Namibia, and 5.6% in Uganda. Because of temporary discontinuity of active follow-up, 20.3% of women were LTFU after 2 years in Zambia. The median time to study notification of a death was 9.1 (IQR, 3.9-14.0) weeks. Although the present study was not a randomized controlled trial, in this cancer cohort with active mobile health follow-up, LTFU was much lower than in previous studies and enabled estimation of up-to-date and reliable cancer survival
Multiyear and multisite photometric campaigns on the bright high-amplitude pulsating subdwarf B star EC 01541-1409
We present follow-up observations of the pulsating subdwarf B (sdB) star EC 01541â1409 as part of our efforts to resolve pulsation spectra for use in asteroseismological analyses. This paper reports on data obtained from a single-site campaign, during 2008, and a multisite campaign, during 2009. From limited 2008 data, we were able to clearly resolve and pre-whiten 24 periods. A subsequent multisite campaign spanning nearly 2 months found over 30 individual periodicities most of which were unstable in amplitude and/or phase. Pulsation amplitudes were found to the detection limit, meaning that further observations would likely reveal more periodicities
Time-series photometry and spectroscopy of the cataclysmic variable EC21178-5417 : exploring new avenues with the Southern African Large Telescope.
Includes abstract.
Includes bibliographical references
A Web-based model for collaboration in the supply chain of the building industry
PROCEEDINGS OF THE 11th ANNUAL CONFERENCE ON WORLD WIDE WEB APPLICATIONS
2-4 September 2009
Port Elizabeth
South AfricaThe construction industry is known for its slow uptake of information and communication
technology. The type and number of participants vary with each construction project and
participants get together for a specific project. These formal relationships are again dissolved
after the project is completed. This is inhibiting the industry from using an information
technology based approach to the formation of a supply chain. In this study a small building
project was used as a case study to document the participants and their role in the building
process. The supply chain from an owner/builder perspective was investigated and the flow of
information among all participants was followed during the construction of the building. A model
of the supply chain, indicating all information flows, is one of the outcomes of this study. The
use of information and communication technology to collaborate among the different
participants in the supply chain in this project was extremely low. Some participants, such as
the draughtsman, used no information technology, whereas others used only basic word
processing applications. A Web-based collaboration model is proposed to enhance
collaboration among the stakeholders of a small construction project. This study is part of a
bigger research project that will not only document how and when information is used in the
South African construction industry, but also suggests how modern information and
communication technologies can enhance collaboration in the construction industry supply
chain.Cape Peninsula University of Technology
PO Box 652
Cape Town
800
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