Anna Frebel

Anna Frebel (2018)

Anna Frebel (* 1980 in Berlin ) is a German astronomer and astrophysicist .

Life

Anna Frebel grew up in Göttingen . After graduating from high school, she began studying physics in Freiburg im Breisgau , which she continued in Australia . She received her PhD from the Mount Stromlo Observatory of the Australian National University in Canberra . With a fellowship (WJ McDonald Postdoctoral Fellowship), she continued her scientific career at the University of Texas at Austin in 2006 and in 2009 with a Clay Postdoc Fellowship at the Harvard-Smithsonian Center for Astrophysics in Cambridge (Massachusetts) .

She has been Assistant Professor since 2012 and Associate Professor of Physics at the Massachusetts Institute of Technology since 2017 .

She is the mother of a son.

Discoveries

In 2005 she was a co-discoverer of HE 1327-2326 , the poorest iron star known to date. This happened during a survey at the Siding Spring Observatory . HE 1523-0901 followed in 2007 with an age of approximately 13.2 billion years. Both are among the oldest known stars in the Milky Way . In 2014 she and other authors reported on the discovery of the star SMSS J031300.36-670839.3 in the southern constellation Little Water Snake . It probably belongs to the second generation of stars that formed shortly after the cosmos was born 13.7 billion years ago.

In 2019, together with colleagues, she and colleagues found a relatively high zinc concentration of around 80 percent of the iron content in HE 1327-2326 through observations with the Cosmic Origins Spectrograph (COS) of the Hubble space telescope in the UV range. This was an indication of asymmetrical supernovae during the collapse of the first stars (population III), which subsequently released heavy elements into the surrounding space in jets, which thus escaped the black hole that formed during the collapse and were even distributed to neighboring galaxies. The heavy elements served as coolants and promoted the formation of the (smaller) stars of the second generation such as HE 1327-2326 even in neighboring galaxies without star formation. In the case of spherically symmetrical collapse, on the other hand, supernova model calculations did not predict a strong zinc accumulation, since the explosion energy is too low (a relatively low iron content in the 2nd generation must also be explained). The scenario also makes these first stars candidates for the source of reionization .

Prizes and awards

Artist's impression of HE 1523-0901 , one of the oldest known stars (graphic by ESO )

• 2007: Charlene Heisler Prize for the best astronomical dissertation in Australia
• 2009: Opening lecture at the XLAB Science Festival, Göttingen
• 2009: Ludwig Biermann Prize of the Astronomical Society
• 2010: Annie Jump Cannon Prize in Astronomy from the American Astronomical Society
• 2010: Lise Meitner Lecturer, Göttingen and Innsbruck
• 2011: Kavli Frontiers of Science Fellow, National Academy of Sciences

Fonts (selection)

• In search of the oldest stars . Fischer, Frankfurt am Main 2012, ISBN 978-3-10-021512-3 .
• Astronomical Society of the Pacific (Ed.): New horizons in astronomy: Frank N. Bash Symposium 2007: proceedings of a workshop held at the University of Texas, Austin, Texas, USA, October 14-16, 2007 . San Francisco 2008.

literature

• Hannes Stein: Anna Frebel . In: Welt online . July 28, 2012.
• Laura Ewert: Anna Frebel. In: Interview , German edition, issue 9/2012, p. 54

Web links

• Anna Frebel , fischerverlage.de
• Anna Frebel at MIT
• Private homepage

Remarks

1. ↑ UFO113 Anna Frebel. Retrieved October 16, 2017 . 
2. ↑ A. Frebel, W. Aoki, N. Christlieb, H. Ando, ​​M. Asplund, PS Barklem, TC Beers, K. Eriksson, C. Fechner, MY Fujimoto, S. Honda, T. Kajino, T. Minezaki, K. Nomoto, JE Norris, SG Ryan, M. Takada-Hidai, S. Tsangarides, Y. Yoshii: Nucleosynthetic signatures of the first stars, Nature, Volume 434, 2005, pp. 871-873. Arxiv
3. ↑ Frebel et al. a., Discovery of HE 1523-0901, a Strongly r-Process-enhanced Metal-poor Star with Detected Uranium, The Astrophysical Journal, Volume 660, 2007, pp. L117-L120.
4. ↑ Keller, Frebel u. a., A single low-energy, iron-poor supernova as the source of metals in the star SMSS J031300.36−670839.3, Nature, Volume 506, 2014, pp. 463–466
5. ↑  Christoph Drösser: SMSS0313-6708: Physicist Frebel finds the oldest star. In: zeit.de. February 9, 2014, accessed December 9, 2014 . 
6. ↑ Rana Ezzeddine, Anna Frebel, I. Roederer, N. Tominaga, M. Ishigaki, K. Nomoto, J. Tumlinson, V. Placco, W. Aoki, Evidence for an Aspherical Population III Supernova Explosion Inferred from the Hyper-metal- poor Star HE 1327-2326, Astroph. J., Volume 876, No. 2, 2019, Arxiv
7. ↑ N. Tominaga, Astroph. J., Volume 690, 2009, p. 526, K. Nomoto, C. Kobayashi, N. Tominaga, Ann. Rev. Astron. Astroph., Volume 51, 2013, p. 457, JI Grimmett, A. Heger, AI Krakas, B. Müller, Monthly Notices Roy. Astron. Soc., Volume 479, 2018, p. 495
8. ↑ Jennifer Chu: Explosions of universe's first stars spewed powerful jets , MIT Technology News, May 8, 2019
9. ↑ Johann Grolle, How everything began, Der Spiegel No. 23, June 1, 2019, pp. 108-109
10. ↑ astronomy.org.au: The Charlene Heisler Prize
11. ↑ Anna Frebel at MIT
12. ↑ dpg-physik.de: Lise-Meitner-Lectures 2010 ( Memento of the original dated December 2, 2018 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.