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31 January 2023 | Story Leonie Bolleurs | Photo Leonie Bolleurs
UFS unveiled new spectrograph
Assisting Prof Richard Gray with the installation of the spectrograph and the polarimeter were the Electronics and Instrumentation departments at both the UFS and the ASU. Left from the spectrograph, are from the left, front: Innes Basson, Head of the Department of Electronics and Instrumentation, Prof Pieter Meintjes, Senior Professor in the Department of Physics, Mark Jackson, Department of Electronics and Instrumentation, Hélène Szegedi, Lecturer in the Department of Physics, and Prof Richard Gray. At the right, from the spectrograph, front, are Natali Matchelt, master’s student, Izak van der Westhuizen, Lecturer in the Department of Physics; Barend Crous, Department of Electronics and Instrumentation; middle: Wian Smit, master’s student, Joleen Barnard, master’s student; back: Kobus Krüger, Department of Electronics and Instrumentation, Henri Roodt, Department of Electronics and Instrumentation; and Dr Hendrik van Heerden, Department of Physics.

The University of the Free State (UFS) is gearing up to be a leading academic institution in astronomical research. The institution successfully mounted a spectrograph with a polarimeter to the Boyden Observatory 1,5-m telescope that will provide scientists with visual access to both the Northern and Southern Hemispheres. 

The instrument, which can be accessed from Boyden, an astronomical research observatory and science education centre a few kilometres outside Bloemfontein, will allow researchers such as the Astrophysics Group at the UFS to do simultaneous polarimetry and spectroscopy of astronomical sources. This is vital for the research they are working on.

Mounting the spectrograph to the telescope and installing the polarimeter completed the upgrade of the 1,5-m telescope and is a leap forward for the astrophysics group at the UFS. The upgraded telescope with the spectropolarimeter, with a valued cost of R1.5 million, will also provide unique opportunities for collaborative research between the Astrophysics Groups at the UFS and researchers from the Appalachian State University (ASU). This adds greatly to the astrophysics research capacity at the university.
 
Prof Richard Gray, who 2019 started with the development of the astronomical spectrograph for the UFS Department of Physics, is a world-renowned expert in stellar spectroscopy, from the Department of Physics and Astronomy at ASU in North Carolina in the US. He was mainly responsible for the development and building of the instrument. 

Prof Pieter Meintjes, Senior Professor from the UFS Department of Physics, describes the moment that installation was completed as a feeling of enormous relief. “It took many hours of hard work, planning and testing to marry the 90-year 1,5-m telescope with the new sophisticated instrument,” he says. 

Adding value to graduate programme

Besides the development and installation of the spectrograph, Prof Gray also designed and built a polarimeter which can be integrated with the spectrograph. When placed inside the spectrograph, this piece of equipment transforms the spectrograph into a spectropolarimeter, giving it additional functionality. “This allows us, for example, to detect and analyse polarised light. It enables us to study the effect of magnetic fields in astronomical sources which introduce various polarisation signatures that can be detected with the polarimeter,” explains Prof Gray.

“I am fascinated by the polarimetric capabilities that we never had before. It is a great step forward,” remarks Prof Meintjes. 

“The Department of Electronics and Instrumentation at the UFS played an enormous role in the building of several components of the instrument that Prof Gray designed, as well as getting the 1.5-m telescope research ready so that the completed instrument could be mounted to the telescope”, says Prof Meintjes

He envisages that the research instrument will be ready for research purposes by March this year. Up till then researchers, graduates, and third-year students will have the opportunity to spend time on the spectrograph to familiarise themselves with it.

polarimeter
Prof Richard Gray posing with the polarimeter. With him is Prof Pieter Meintjes. (Photo: Leonie Bolleurs)


“Once installation is finalised, the UFS will be the only academic institution in South Africa with access to a 1.5-m telescope paired with a spectrograph. This gives us an edge in terms of our astrophysics programme and the training we provide our students. It also adds so much value to our graduate programme,” he says.

New instrument provides much flexibility

The spectrograph offers Prof Meintjes many possibilities for his research, and he is eager to put the instrument to use. To study binary systems as well as the jets of Active Galactic Nuclei (AGN), you need a spectrograph, preferably with polarimetric capabilities. It can also be applied to finding elements at the surface levels of stars so that their chemical composition can be determined.

“In the past, we needed to send our researchers to Sutherland and they were never guaranteed clear skies. Having this facility gives us so much flexibility,” he says.

 

Tsebo Matsoso and Siphephelo Ndlovu

Prof Brian van Soelen from the Department of Physics will be a key user of the spectrograph for his research. He is also playing an important role in terms of postgraduate training and research where the spectrograph is applied. 

Photo: Mart-Mari Duvenhage

  

 


The polarimeter converts the spectrograph to a spectropolarimeter. This instrument, which is mounted on a telescope (in the case of the UFS, it is mounted on the Boyden 1,5-m telescope) enables the user to detect whether radiation from  astronomical objects are polarised and to analyse the level of polarisation of the  light. Scientists can then, for instance, study the effect of magnetic fields in astronomical sources, which introduce various polarisation signatures (typically with a characteristic  level of polarisation).

News Archive

PhD students’ voices reverberate across Africa and beyond
2014-01-14

 

Noel Ndumeya, Tinashe Nyamunda, Ivo Mhike and Anusa Daimon
Photo: Hannes Pieterse
The Centre of Africa Studies (CAS) has been recruiting the best young scholars from across the SADC region – with magnificent success. In the span of six months, four PhD students have excelled both on the African continent and abroad.

Anusa Daimon, Noel Ndumeya, Ivo Mhike and Tinashe Nyamunda – the names of these distinguished students. Set against the backdrop of global excellence and competition, they have been awarded several positions at conferences and already published world-wide.

Anusa Daimon’s PhD studies at the CAS focuses on Malawian migrants and their descendants in Southern Africa. It explores issues of identity construction and agency among this group.

Since his arrival at the CAS, Daimon has won two fully-funded awards to attend international conferences and workshops. He was invited to attend the Young African Scholars Conference at Cambridge University in the UK. He also went to Brazil to the IGK Work and Human Lifecycle in Global History Summer Academy. This workshop explored the historical and modern meanings and practices of work in terms of ‘freedom’ and ‘unfreedom’.

Noel Ndumeya holds a special interest in environmental history and the aspects of conservation and conflict. His PhD hones in on land and agrarian studies with specific focus on South Eastern Zimbabwe.

Ndumeya has won an award from the African Studies Association United Kingdom (ASAUK). This earned him an invitation to Nairobi, Kenya, to work with an editor from the Journal of Southern Africa Studies (JSAS).

Ivo Mhike’s research specialises in youth culture and their relationship with the state. In his PhD he uses juvenile delinquency as a window towards an analysis of social constructs of youth behaviour. This includes youth policy and their institutional and administrative links to the state.

Mhike has been invited to attend the CODESRIA Child and Youth Institute in Dakar, Senegal, with the theme: Social Protection and the Citizen Rights of Vulnerable Children in Africa.

Tinashe Nyamunda specialises in African Economic History. His PhD thesis is entitled, “The State and Finance in Rhodesia: A study of the evolution of the monetary system during the Unilateral Declaration of Independence (UDI), 1965–1979”.

Under the direction of his primary supervisor, Prof Ian Phimister and his secondary supervisor, Dr Andrew Cohen, four of his papers have been accepted for publication. Nyamunda also received sponsorship from the Rector’s Office for an edited book collection of which he is the leading author. The book focuses on the many aspects of Zimbabwe’s blood diamonds.

Recently, Nyamunda has contributed papers at conferences in Botswana and Scotland and attended a workshop at Lund University in Sweden. He has also received an invitation from Germany and Oxford to present some chapters of his PhD thesis.

“The centre has provided the best working environment any PhD student can dream of,” Nyamunda said. He continued to remark that the opportunities Prof Jonathan Jansen has created opened up immense possibilities for them.

“Given these fruitful experiences in just a year at the university,” Nyamunda said,” imagine what can be accomplished given the resources and environment availed by the institution.” The prospects after his PhD studies looks bright, he concluded, because of the opportunities provided by the UFS.

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