Breezy Ocana

Investigation´s Projects

Title: TANGO: Thorough ANalysis of radio Galaxies Observations

Institution:

Date: 15th February, 2011

Content: One of the major questions of modern astrophysics is to understand the evolution of radio galaxies. TANGO´s approach is the study of the role of the Interstellar Medium (ISM) in elliptical radio galaxies from a new perspective: a) it is a unique sample selected only on the basis of radio continuum flux densities, b) it is a large sample, divided in two sub-samples with galaxies in a redshift range between 0-0.1 and 0.3-1 which will allow the analysis at different periods. Furthermore, the main driver of this project is the study of the origin of the molecular gas in radio galaxies (e.g., stellar mass loss, X-ray cooling flow, minor/major mergers, cosmological filaments), its distribution and dynamics related with the properties of the radio galaxies, and the interplay between the molecular gas and the Active Galactic Nuclei via the radio jet, X-ray/Optical field, etc. ------------- Uno los misterios más grandes de la astrofísica es el entendimiento del comportamiento de la evolución de las radio galaxias. El método que TANGO usa para entender este comportamiento está basado en el estudio del medio inter-estelar en radio galaxias elípticas y lo hace desde una nueva perspectiva: a) Es una muestra única ya que está seleccionada tomando en cuenta solamente la densidad de flujo de la emisión del radio continuo. b) Es una muestra grande y está dividida en dos sub-muestras, la primera, con 52 galaxias en un rango de redshift entre 0 y 0.1 y la otra muestra con 49 galaxias en un rango de redshift entre 0.3 y 1 lo cual nos permite un análisis en distintos períodos de evolución. La razón principal de este proyecto es el estudio del origen del gas molecular en radio galaxias (por ejemplo, pérdida de masa estelar, "cooling flows" en rayos X, fusiones menores/mayores, filamentos cosmológicos), su distribución y su dinámica, relacionada con las propiedades de las radio galaxias y los papeles que juega el gas molecular en relación con núcleo galáctico activo a traves de los radio jets, rayos X/campo óptico, etc.

Title: Minima timing of the low mass eclipsing binary CM-Draconis

Institution: Instituto Astrofísico de Canarias, España

Date: 07th July, 2006

Content: The binary star system CM Draconis has been studied before with data up until the year 1999 \cite{Deeg2000}. Since we have new data, from that year to the year 2004, this report wishes to continue analizing the binary star system, now including this new data, resulting in a thorough analysis. In the article presented by Deeg at al. 2000, they had 41 measured sets of minimum times of the eclipses with a standard deviation of a lineal efemerides of 5.74 seconds, and they analyzed the power spectrum of the residuals where they show one periodicity of more than 2 seconds of amplitude. This result, plus a periodicity of 750-1050 days, has an amplitude of ~2.8 seconds. In this project we repeated the analysis with the data that Deeg et al. 2000 had, plus the new data collected until the year 2004. This new set of data has a total of 62 eclipses; 27 of them are primary eclipses and 35 are secondary eclipses. Using this information we did a minimum time eclipses analysis and we did apply it to different situations. The case where the system did not change positions with respect to the observer; the case in which the system moves with a constant velocity with respect to the observer; the case in which the system moves with an acceleration relative to the observer; and finally the case of a sinusoidal motion and a combination between the sinusoidal and a linear motion. With this information we could determine that the binary star system has a very slow acceletation rate of about 9x10^-8 m/s^2 and that it has a non-linear behavior. This acceleration could mean that there is a third body orbiting the system with a very long period, or it could also mean that there is a star relatively close that has some gravitational influence over the system. In order to be able to obtain some conclusions we need to continue the observations of the primary and secondary eclipses of CM Daconis. We did not find any evidence of the existence of any planet orbiting the binary star system, but the system is compatible with a planet of about 0.74Mj orbiting the stars in about 12 years.

Title: Observation of the star HD209458 and its transits.

Institution: Florida Institute of Technology. Melbourne, Fl. U.S.A.

Date: 10th September, 2002

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