First Detailed Images of Dying Giant Star, 350 X Larger Than The Sun

In this study, the researchers discovered the surface of the giant star π1Gruis had a complex convective pattern and the typical granule measured 1.2 x 1011 meters horizontally or 27 percent of the diameter of the star. The findings are published in the journal Nature.

“This is the first time that we have such a giant star that is unambiguously imaged with that level of details,” said Dr. Fabien Baron, assistant professor in the Department of Physics and Astronomy at Georgia State University. “The reason is there’s a limit to the details we can see based on the size of the telescope used for the observations. For this paper, we used an interferometer. The light from several telescopes is combined to overcome the limit of each telescope, thus achieving a resolution equivalent to that of a much larger telescope.”

The star π1Gruis was observed with the PIONIER instrument, which has four combined telescopes, in Chile in September 2014. Baron, who specializes in making images, used interferometric data, image reconstruction software and algorithms to compose images of the star’s surface. Interferometry is relatively new to astronomy, and Georgia State’s Center for High Angular Resolution Astronomy array was the first facility to use interferometry to image a star similar to the Sun in 2007.

This study was also the first to confirm theories about the characteristics of granules on giant stars.

“These images are important because the size and number of granules on the surface actually fit very well with models that predict what we should be seeing,” Baron said. “That tells us that our models of stars are not far from reality. We’re probably on the right track to understand these kinds of stars.”

The detailed images also showed different colors on the star’s surface, which correspond to varying temperatures. A star doesn’t have the same surface temperature throughout, and its surface provides our only clues to understand its internals. As temperatures rise and fall, the hotter, more fluid areas become brighter colors (such as white) and the cooler, more dense areas become darker colors (such as red).

In the future, the researchers would like to make even more detailed images of the surface of giant stars and follow the evolution of these granules continuously, instead of only getting snapshot images.

Co-authors of the study are from Université libre de Bruxelles, European Southern Observatory, Université Grenoble Alpes, Uppsala University, the University of Vienna, Université de Nice Sophia-Antipolis and the University of Exeter.

The study is funded by the National Science Foundation, Fonds National de la Recherche Scientifique, Belgian Science Policy Office, Philip Leverhulme Prize, European Union’s Horizon 2020 research and innovation programme and the Austrian Science Fund.

Contacts and sources:
LaTina Emerson
Georgia State University

Citation: Large granulation cells on the surface of the giant star π1 Gruis .
C. Paladini, F. Baron, A. Jorissen, J.-B. Le Bouquin, B. Freytag, S. Van Eck, M. Wittkowski, J. Hron, A. Chiavassa, J.-P. Berger, C. Siopis, A. Mayer, G. Sadowski, K. Kravchenko, S. Shetye, F. Kerschbaum, J. Kluska, S. Ramstedt. . Nature, 2017; 553 (7688): 310 DOI: 10.1038/nature25001