Yoleydis Gómez

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A star like the Sun becomes a planetary nebula towards the end of its life, when the envelope ejected during the earlier giant phase becomes photoionized as the surface of the remnant star reaches a temperature of approximately 30,000 K. The spherical symmetry of the giant phase is lost in the transition to a planetary nebula, when non-spherical shells and(More)
We have studied the kinematics traced by the water masers located at the centre of the planetary nebula (PN) K3-35, using data from previous Very Large Array (VLA) observations. An analysis of the spatial distribution and line-of-sight velocities of the maser spots allows us to identify typical patterns of a rotating and expanding ring in the(More)
We present radio continuum observations of the planetary nebula (PN) IRAS 173473139 (one of the only two known to harbour water maser emission), made to derive its spectral index and the turnover frequency of the emission. The spectrum of the source rises in the whole frequency range sampled, from 2.4 to 24.9 GHz, although the spectral index seems to(More)
  • NEBULA IRAS, Dana Tafoya, +6 authors I. de Gregorio-Monsalvo
  • 2009
We present observations of continuum (λ = 0.7, 1.3, 3.6, and 18 cm) and OH maser (λ = 18 cm) emission toward the young planetary nebula IRAS 17347−3139, which is one of the three planetary nebulae that are known to harbor water maser emission. From the continuum observations, we show that the ionized shell of IRAS 17347−3139 consists of two main structures:(More)
We report the detection, for the first time, of HCO (J = 1 → 0) emission as well as marginal CO (J = 1 → 0) emission toward the planetary nebula (PN) K 3-35 as a result of a molecular survey carried out toward this source. We also report new observations of the previously detected CO (J = 2 → 1) and water maser emission, as well as upper limits for the(More)
We present high angular resolution Very Large Array (VLA) and Berkeley-Illinois-Maryland Association (BIMA) observations of NH3, HCO +, HCN, and SO molecular emission and 1.4, 3.5, and 7 mm continuum emission toward the exciting source of the HH 80–81 system. This object is one of the few massive protostars known to be driving a collimated outflow. We(More)
We present radio continuum observations of the planetary nebula (PN) IRAS 173473139 (one of the only two known to harbour water maser emission), made to derive its spectral index and the turnover frequency of the emission. The spectrum of the source rises in the whole frequency range sampled, from 2.4 to 24.9 GHz, although the spectral index seems to(More)
We report about the use of carbon paste electrode modified with kaolinite for analytical detection of trace lead(II) in domestic water by differential pulse voltammetry. Kaolinite clay was modified with tripolyphosphate (TPP) by impregnation method. The results show that TPP in kaolinite clay plays an important role in the accumulation process of Pb(II) on(More)
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