Weekly Calendar of Events

AUGUST 18 - 22, 2014


2:00 pm: Seamless Astronomy Colloquium. "Our Perceptual Limits in Reading and Interpreting Visualizations," Arzu Çöltekin, University of Zurich. Phillips Auditorium.

Abstract: Visualizations help us in interpreting and communicating complex concepts and rich data. However, we have a number of perceptual and cognitive limitations that counter-intuitively work against us when we work with visualizations. These limitations lead to critical mistakes, e.g., in interpreting patterns or simply reading information from a graphic. What are these culprits and how can we avoid them? This talk by Arzu Çöltekin (Zurich) offers an overview of the state of the art knowledge about scientific visualizations from a design perspective to help avoid some of the well-documented mistakes when creating a visual product.


12:30 pm: Radio and Geoastronomy Division Lunch Talk. "The Role of Low-Mass Star Clusters in the Formation of Massive Stars," Victor Rivilla, Spanish Council for Scientific Research, CSIC-CAB/INTA. Room M-340, 160 Concord Avenue.

Abstract: Despite the importance of massive stars as the main source of energy injection into the ISM of galaxies, their formation process is not clearly understood. To distinguish between the different theories it is crucial to establish how the parental cloud fragments by studying the distribution of low-mass stars in massive star cradles. The detection of this population is a challenge because it is highly embedded in the natal molecular material. Only deep IR, X-ray and radio/(sub)millimeter observations are able to penetrate into the massive star cradles and reveal the stellar population. I have analyzed deep X-ray and IR archival surveys towards 3 nearby massive star forming regions (Orion, DR21 and Monoceros R2). I have studied the properties of the low-mass stellar population (e.g., spatial distribution, clustering, stellar densities, extinction distribution, evolutionary stages), and their feedback into the star-forming environment. In particular, I have evaluated how the outflow-driven turbulence in dense subclusters of low-mass stars can affect the formation of massive stars. I discuss my results in the context of the different massive star formation theories. I will also present new Very Large Array (VLA) and Submillimeter Array (SMA) observations of Orion and Monoceros R2, respectively. The multi-epoch VLA continuum data has allowed to study the nature of the radiovariability of Orion young stars. The SMA observations have revealed bright continuum emission and molecular hot cores towards the more massive stars and 11 previously unknown CO molecular outflows from the embedded stellar cluster.

The Calendar is prepared by the Web Services Group. Entries may be submitted via email to weekly_cal@cfa.


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