Marcos P. Diaz

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Equilibrium gated radionuclide ventriculography is one of the most important fields of work in nuclear cardiology. The in vivo labelled method utilizing 99mTc and red cells labelled with pyrophosphate is one of the most widely used. In the present work determination of the optimum 99mTc activity was studied. A sample of 30 patients was divided into five(More)
The viability of nonaqueous capillary electrophoresis (NACE) was investigated for the simultaneous determination of tamoxifen, imipramine and their main metabolites (4-hydroxytamoxifen and desipramine, respectively). Baseline separation of the studied solutes was obtained on a 57cm x 75mum capillary using a nonaqueous solution composed of 17mM ammonium(More)
In an effort to determine the orbital period of the enigmatic star DI Cru ≡ WR 46 ≡ HD 104994, we made photometric and spectroscopic observations of this object between 1996 and 2002. Both photometric and spectroscopic characteristics are quite complex. The star is highly variable on short (few hours) as well as on long (few months) time-scales. The optical(More)
Time resolved spectroscopic and photometric observations of the pre-cataclysmic binary PG1026+002 are presented. An improved orbital period is derived from radial velocity measurements of the Hα emission component. The phasing of the variations of the equivalent width of this line confirms the suspicion expressed by Saffer et al. (1993) that the emission is(More)
Flickering is a phenomenon related to the mass accretion observed among many classes of astrophysical objects. In this paper we present a study of the flickering emission lines and continuum of the Cataclysmic Variable V3885 Sgr. The flickering behavior is first analyzed through statistical analysis and lightcurves power spectra. Autocorrelation techniques(More)
Both continuum and emission line flickering are phenomena directly associated with the mass accretion process. In this work we simulate accretion disk Doppler maps including the effects of winds and flickering flares. Synthetic flickering Doppler maps are calculated and the effect of the flickering parameters on the maps is explored. Jets and winds occur in(More)
We present the results of spectrophotometric observations of the old nova RR Pic performed in two spectral ranges, one centered in the Hα line and other covering Hβ and Hγ spectral lines. From the Hβ radial velocity study we found a primary radial semi-amplitude of K1 = 37(1) km s −1 and a systemic velocity of γ = 1.8(2) km s. With this new values a mass(More)
A detailed analysis of the orbital period distribution of classical novae is presented. The most important selection effects as well as the nova outburst frequency are evaluated as a function of the binary period in order to determine the intrinsic period distribution of nova progenitors in the galaxy. They cause it to be remarkably different from the(More)