OUTREACH
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TALKS
- Viernes de Ciencia, IAM-UdeG, Guadalajara, Jalisco, Mexico
- Every friday - 19:00
- Ciclo de Charlas de Astronomía - La Jacaranda Cultural, Pátzcuaro, Michoacán, Mexico
- 1st. friday of the month - 20:00
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SEMINARS
- The planetary nebula HuBi 1, a rebel with a cause
- Planetary nebulae, the descendants of low- and intermediate-mass stars, have characteristic onion-like ionization structure, with the highest ionization species closer to the central star. This is true for all planetary nebulae, but HuBi 1, which shows an inverted ionization inner shell. There is a reason for this oddity, a peculiar stellar evolution of its central star, which makes HuBi 1 the missing link of the population of cool C-rich central stars of planetary nebulae. Dr. Martin Guerrero
- Spirals, rings and arcs around evolved stars
- The Hubble (HST) and Spitzer telescopes were the first instruments to unveil the presence of rings and arcs around evolved low-mass stars (AGB stars, proto-PNe and PNe) in great detail. Since the mid-2000s it was suggested that these structures were ubiquitous around evolved low-mass stars. We searched the complete archive of the HST and Spitzer to characterise these structures, study their physical properties and address their formation mechanisms. In this talk, we present the observational results of our survey, the predictions of simple radiation-hydrodynamic simulations as well as the future of the project. Dr. Jesús Toalá
- Searching extended line-emission objects in wide-field surveys: The IPHAS experience
- One of the problems we are facing in the study of evolved low- and intermediate-mass stars such as Planetary Nebulae (PNe) is the lack of completeness. Most known PNe belong to the bright or intermediate part of the luminosity function, leaving out those at the faint end. Any global chemical, kinematical, and physical analysis of the PN population is therefore biased. In 2003 the INT Photometric Halpha Survey started scanning the Galactic Plane to look for new emission-line objects of all sort among which new PNe. I have been working on the detection of new low surface-brightness extended nebulae using a mosaicking technique. Various new symbiotic stars, supernova remnants and PNe that had escaped earlier screening were then discovered. I will present the characteristic of IPHAS and the detection methods that were used and how this experience can be used by other imaging and photometric surveys. Dra. Laurence Sabin
- Hydrodynamical models of planetary nebulae with [WC] central stars
- High-resolution, long-slit spectroscopic observations of two planetary nebulae, M1-32 and M3-15 are presented. The observations were obtained with the 2.1-m telescope at the OAN- SPM, and MES spectrograph. M1-32 shows wide wings on the base of its emission lines, M3-15 has two very faint high-velocity knots. To model M1-32 and M3-15 we built a 3D model consisting in a jet interacting with an equatorially concentrated slow wind, emulating the presence of a dense torus, by using the hydrodynamical code Yguazú. Spectroscopically we find that both M 3-15 and M 1-32 show a torus and high-velocity bipolar ejections. Therefore, we propose to call them ‘spectroscopic bipolar nebulae’. Our models are good agreement with the observations. Dra. Jackeline Rechy García
- The orientation of the collimated outflows of planetary nebula: independence day
- The discovery of collimated outflows in planetary nebulae (PNe) has changed the paradigm of PN formation. They actively participate in the nebular shaping immediately before or while fast stellar winds and D-type ionization fronts shock and swept the nebular envelope. The general properties of collimated outflows of PNe cannot be studied because projection effects do not allow us to determine their space velocities and linear sizes. The large number of collimated outflows already detected in PNe can be used to derive orientation independent properties of this sample of outflows. We find they can be assigned in two different populations: about 85% collimated outflows have space velocities below 100 km/s and only 15% have larger velocities. Collimated outflows are mostly coeval with their PNe and their ages imply time spans before they dissolve shorter than a few thousand years. A significant fraction of collimated outflows experience notable interactions with the nebular envelope and get trapped into it, traveling away at velocities similar to the that of their parent PNe. Dra. Jackeline Rechy García and Dr. Martín Guerrero
- Recent findings on nova explosions
- Nova events are the result of the interaction of low-mass binary systems. A compact white dwarf (WD) accretes material from an old and cold companion until a thermonuclear runaway takes place on its surface. Such explosive events can be considered the scaled-down siblings of supernova (SN) explosions, but its study has many advantages over SNe, as nova events are more numerous (some systems even exhibit recurrent explosions within decades) and their evolution and expansion can be followed in human time-scales. In this talk I will review the most recent findings of our group. I will present a multi-epoch study of a sample of novae from historical archival observations in conjunction with recent ground-based images to characterize the hydrodynamic evolution of nova shells. Finally, I will address our discovery of the first magnetized jet in a classical nova using Chandra and XMM-Newton X-ray observations. Dr. Jesús Toalá
- Coloquios, IRyA-UNAM, Morelia, Michoacán, Mexico
- Every thursday - 12:00
- Seminarios, IAA-CSIC, Granada, Spain
- Throughout the year
- Seminarios, IA-UNAM, Ensenada, BC, Mexico
- Every wednesday - 11:00
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EVENTS
