Osservatorio Astrofisico di Arcetri

AstroBigné seminars

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The Astrobigné Organizing Committee is currently composed of Crescenzo Tortora (Questo indirizzo email è protetto dagli spambots. È necessario abilitare JavaScript per vederlo. , reference person for the extragalactic group), Nicoletta Sanna (Questo indirizzo email è protetto dagli spambots. È necessario abilitare JavaScript per vederlo. , galactic group), and Alessio Turchi (Questo indirizzo email è protetto dagli spambots. È necessario abilitare JavaScript per vederlo. , for the technological area), supported by our director Maria Sofia Randich and by the invaluable help of Emanuela Masini with the "real" stuff.

The Astrobigné concept:

Astrobigné is a series of short seminars that are held at the Osservatorio, with the goal of interconnecting the community of people working here, spreading new ideas and results, creating and reinforcing synergies between groups and indiduals. As such, Astrobigne's are meant to be accessible to a broad audience, including astronomers and technology staff, from senior researchers to students. Not by chance, the name "bigné" was chosen to designate something delicious, attractive, quick to grasp and easy to "eat".

In practice, the astrobigne talks:

  • must be short (10 minutes plus 5 for open discussion, strict, 6-8 slides at most)
  • must present only 1-2 key points that people can assimilate quickly should be aimed at triggering later discussions, collaboration, and future activities.
  • at this aim, can also present ongoing work with intermediate results can cover a broad range of topics, including astronomy, technology, historic research, public outreach, organization etc...
  • will NEVER present a general overview of the subject and a complete account of the speaker's work
  • are given in English whenever possible (this is not because we don't love Italian, but we all understand that English is our professional language to be used to foster international collaborations. Not to mention that here usually are non-Italians in the audience).

Astrobigne's take place on Tuesdays, every two weeks in the main auditorium of OAArcetri (Aula A). We usually have two bigne'-talks (10+5minutes each), selected by the organizing committee in order to cover as many different areas of interest as possible. Before the talks, at 11:45, we normally meet in Aula A to socialize and eat real bigne's (pastries!). The talks start at noon, but everybody is strongly advised to come by 11:45 so not to miss the... beginning of the talks!

Next Astrobigné

Tuesday 25 February 2020 - 11:45 Aula A


Armando Rirccardi [Adaptive Optics]

Adaptive Optics module of ERIS left Arcetri to Garching: a step toward the full instrument integration

The adaptive optics module of ERIS, the new IR instrument for the VLT, recently passed the acceptance test in Arcetri. One week ago was finally packed and shipped to the Max Planck Institut in Garching for the
integration with the science instruments, the NIX camera and the SPIFFIER spectrograph. The talk briefly reports the current status of ERIS and the next steps toward the fully integrated instrument preliminary acceptance in Europe (PAE) before the shipping to Paranal. 


Laura Colzi [Star Formation]

Enhanced nitrogen fractionation at 05358+3543core scales: the high-mass star-forming region IR

It is well known that the ^14 N/^15 N isotopic ratio measured for the proto-Solar nebula (PSN), 440, is significantly higher than that measured in pristine Solar System materials, like comets (140). This suggests a local chemical enrichment of ^15 N during the Sun formation process. However, the cause of this enrichment and its relationship with the natal clump are still uncertain. Since there is growing evidence pointing out that our Sun was born in a rich cluster containing massive stars, during my PhD thesis I have studied the ^14 N/^15 N ratio in a large sample of high-mass star forming regions. In particular, in this talk I will briefly describe the analysis that I have done towards the massive star-forming protocluster IRAS 05358+3543. I have obtained the first interferometric maps of N-fractionation combining single-dish and high-resolution interferometric observations of the ^15 N-isotopologues of N_2 H^+ . The analysis yields ^14 N/^15 N ratios of 100-200 in the cores, and higher values of about 200 in the diffuse clump gas. This result, which strongly suggests a local chemical enrichment of ^15 N at core-scales, helps us to understand how the chemical inventory evolves from the parental molecular reservoir to smaller-scale objects, in which star-formation occurs. In particular, with future observations of other molecular species we will be able to test the importance of isotope-selective photodissociation of N_2 to explain the observed values through chemical models.



Archive of past Astrobigné