150 research outputs found
GEOS RR Lyr survey: FM Del is indeed a cepheid
Though FM Del has been considered as a RR Lyr star by Preston et al. in 1959
(following discovery by Huth, 1957), Huth (1960) eventually changed his mind by
showing that it is in fact a cepheid of W Vir type of period of 3.95452 days.
Various authors since then have considered it as a cepheid indeed, with the
exception of Wils et al. (2006) who list this star in their RR Lyr catalog with
a period of 0.79688 days. On this basis, FM Del was added to Tarot RR Lyr
program. We present here these observations which confirm the cepheid type.Comment: Published in the GEOS circulars (Groupe Europeen d'Observations
Stellaires, http://geos.upv.es/
Protocols for Robotic Telescope Networks
Autonomous robotic observatories can use modern communications to receive pertinent information from institutes that generate events to observe (e.g., supernovae, near-earth asteroids, gravitational lensings, and gamma-ray bursts).
This paper is addressed to astronomers who are not specialists in computer science. We give explanations of some basic and advanced protocols to receive events and how to implement them in a robotic observatory software. We describe messages such as GCN notices, VOEvents or RTML, and protocols such as CGI, HTTP, SOAP, RSS, and XMPP
The star RR Lyr and the Cepheid variables in the era of the space photometry revolution
The long-term behaviours of the pulsation and Blazhko periods of RR Lyr are
investigated by means of Kepler and ground-based observations. The difficulties
in detecting additional modes in the Cepheids monitored with CoRoT are
discussed.Comment: Conference Proceedings - CoRoT3-KASC7 The Space Photometry
Revolution, Toulouse, France, July 6-11 2014. Paper on CoRoT Cepheids
submitted to MNRA
Cool carbon stars in the halo and in dwarf galaxies: Halpha, colours, and variabiity
The population of cool carbon (C) stars located far from the galactic plane
is probably made of debris of small galaxies such as the Sagittarius dwarf
spheroidal galaxy (Sgr), which are disrupted by the gravitational field of the
Galaxy. We aim to know this population better through spectroscopy, 2MASS
photometric colours, and variability data. When possible, we compared the halo
results to C star populations in the Fornax dwarf spheroidal galaxy, Sgr, and
the solar neighbourhood. We first present a few new discoveries of C stars in
the halo and in Fornax. The number of spectra of halo C stars is now 125. Forty
percent show Halpha in emission. The narrow location in the JHK diagram of the
halo C stars is found to differ from that of similar C stars in the above
galaxies. The light curves of the Catalina and LINEAR variability databases
were exploited to derive the pulsation periods of 66 halo C stars. A few
supplementary periods were obtained with the TAROT telescopes. We confirm that
the period distribution of the halo strongly resembles that of Fornax, and we
found that is it very different from the C stars in the solar neighbourhood.
There is a larger proportion of short period Mira/SRa variables in the halo
than in Sgr, but the survey for C stars in this dwarf galaxy is not complete,
and the study of their variability needs to be continued to investigate the
link between Sgr and the cool halo C stars.Comment: 11 pages, 10 figures + one appendix of 26 pages; accepted for
publication in Astronomy and Astrophysic
Dispositif de contrôle de l'articulation d'une orthèse ou prothèse de membre supérieur ou inférieur
L'invention concerne un mécanisme d'articulation de deux éléments (1,4) d'une orthèse ou d'une prothèse, l'un des éléments (1) étant solidaire de la cuisse d'un sujet, l'autre (4) étant solidaire de ou appartenant à la jambe de ce dernier, caractérisé en ce que qu'il comprend une bague intérieure (6) portée par l'un (1) des éléments et une bague extérieure (2) portée par l'autre élément (4), les bagues étant accouplées à rotation par l'intermédiaire d'un embrayage (7,8,8a) à coincement intercalé entre elles et pourvu d'un moyen de neutralisation (9,10,11) de l'accouplement des deux bagues comportant une roue (9) de commande coopérant par enroulement sans glissement avec au moins un lien (12) d'indexation de la roue dans l'une ou l'autre de deux positions de celle-ci par rapport à l'embrayage
Le droit au secours dans la province du Québec
Fait unique en Amérique du Nord, la législature québécoise inscrit, en 1975, un droit au secours dans le chapitre des libertés et droits fondamentaux de la Charte des droits et libertés de la personne. Dans ce qui suit, nous analysons en détail la portée générale de ce droit fondamental ainsi que l'obligation qu'il entraîne. Nous soumettrons une façon d'harmoniser l'obligation de porter secours de l'article 2 de la Charte avec la législation existante, notamment avec l'article 1053 C.c. Après étude des carences relevées dans l'obligation de porter secours, nous en proposons des amendements concrets.Abstract: Since 1975, the Quebec Charter of Rights and Freedoms contains a unique fact in North American legislation: the right to be rescued if one's life is in danger. In what follows, we will provide a detailed analysis of the rights and duties deriving from this legislation. We will submit a way of balancing out the obligation to bring succour (in article 2 of the Charter of rights) with the existing legislation, particularly the article 1053 C.c. After close scrutiny of the shortcomings inventoried in this obligation to bring succour, we propose some concrete amendments
La grossesse contractuelle : aspects juridiques et sociaux
Résumé: Lorsque tous les espoirs de procréer naturellement sont perdus, la grossesse contractuelle semble une alternative plus efficace et plus naturelle que l'adoption pour les couples infertiles. Mais le désir de procréer, de se transmettre à travers ses enfants, nous donne-t-il le droit à l'enfant à tout prix? Cet essai étudie le contrat de grossesse en fonction du droit positif québécois. La validité et les enjeux de tels arrangements à tous les niveaux, y compris les intermédiaires professionnels, sont questionnés. A partir des limites normatives, le gouvernement pourrait établir des limites juridiques à la grossesse contractuelle. Il y va de la dignité de la femme et de l'enfant.||Abstract: When infertile couples have lost any hope of having children, surrogacy may seem a more efficient and natural choice than adoption. What is descendants? the price of wishing to procreate, of desiring Is there a right to a child, at any price? This essay analyses the surrogacy contract according to the Quebec Civil Law. It raises the issues of both the legal validity and the social risks as well as the role of the professional intermediary of such agreements. On the basis of normative principles, the government should legislate to limit surrogacy arrangements. The dignity of children and of women are at stake
Investigating the impact of optical selection effects on observed rest frame prompt GRB properties
Measuring gamma-ray burst (GRB) properties in their rest-frame is crucial to
understand the physics at work in gamma-ray bursts. This can only be done for
GRBs with known redshift. Since redshifts are usually measured from the optical
spectrum of the afterglow, correlations between prompt and afterglow emissions
may introduce biases in the distribution of rest-frame properties of the prompt
emission. Our analysis is based on a sample of 90 GRBs with good optical
follow-up and well measured prompt emission. 76 of them have a measure of
redshift and 14 have no redshift. We estimate their optical brightness with
their R magnitude measured two hours after the trigger and compare the rest
frame prompt properties of different classes of GRB afterglow brightness. We
find that the optical brightness of GRBs in our sample is mainly driven by
their intrinsic afterglow luminosity. We show that GRBs with low and high
afterglow optical fluxes have similar Epi , Eiso , Liso , indicating that the
rest-frame distributions computed from GRBs with a redshift are not
significantly distorted by optical selection effects. However we found that the
rest frame T90 distribution is not immune to optical selection effect, which
favor the selection of GRBs with longer durations. Finally, we note that GRBs
in the upper part of the Epi-Eiso plane have fainter optical afterglows and we
show that optical selection effects strongly favor the detection of GRBs with
bright afterglows located close or below the best-fit Epi-Eiso relation, whose
redshift is easily measurable.Comment: 41 pages, 10 figures, 7 tables. arXiv admin note: substantial text
overlap with arXiv:1503.0276
Dispositif de contrôle de l'articulation d'une orthèse ou prothèse de membre supérieur ou inférieur
L'invention concerne un mécanisme d'articulation de deux éléments (1,4) d'une orthèse ou d'une prothèse, l'un des éléments (1) étant solidaire de la cuisse d'un sujet, l'autre (4) étant solidaire de ou appartenant à la jambe de ce dernier, caractérisé en ce que qu'il comprend une bague intérieure (6) portée par l'un (1) des éléments et une bague extérieure (2) portée par l'autre élément (4), les bagues étant accouplées à rotation par l'intermédiaire d'un embrayage (7,8,8a) à coincement intercalé entre elles et pourvu d'un moyen de neutralisation (9,10,11) de l'accouplement des deux bagues comportant une roue (9) de commande coopérant par enroulement sans glissement avec au moins un lien (12) d'indexation de la roue dans l'une ou l'autre de deux positions de celle-ci par rapport à l'embrayage
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