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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

Game farming a lens to analyse challenges facing democratic SA – Dr Kamuti
2017-05-30

 Description: Dr Kamuti Tags: Dr Kamuti

Dr Tariro Kamuti, Postdoctoral Fellow at the Centre
for Africa Studies at the University of the Free State.
Photo: Rulanzen Martin

One of the challenges facing South Africa’s developing game farming policy is the fractured state in the governance of the private game farming sector, says Dr Tariro Kamuti.

Dr Kamuti, a Postdoctoral Research Fellow at the Centre for Africa Studies (CAS) at the University of the Free State (UFS), was presenting a seminar on Wednesday 17 May 2017 under the topic, Private Wildlife Governance in a Context of Radical Uncertainty: Challenges of South Africa’s Developing Game Farming Policy, which takes material from his PhD. He received his PhD from both the Vrije University in Amsterdam and the UFS in 2016.

His presentation explored how the private game industry positions itself in accordance with existing agricultural and environmental regulations. It also investigated the state’s response to the challenge of competing needs over land and wildlife resources which is posed by the gaming sector. “The transformation of the institutional processes mediating governance of the private game farming sector has been a long and enduring arrangement emerging organically over time,” Dr Kamuti said.

Game farming links wildlife and agricultural sectors
“I decided on this topic to highlight that game farming links the wildlife sector (associated with conservation and tourism) and the agricultural sector. Both make use of land whose resources need to be sustainably utilised to meet a broad spectrum of needs for the diverse South African population.

“The continuous skewed ownership of land post-1994 justifies questioning of the role of the state in confronting challenges of social justice and transformation within the economy.”

“Game farming can thus be viewed as a lens through which to study the broad challenges facing a democratic South Africa, and to interrogate the regulatory and policy framework in the agricultural and wildlife sectors at their interface,” Dr Kamuti said.

Challenges facing game farming policies

The state alone does not apply itself to the regulation of private gaming as a sector. “There is no clear direction on the position of private game farming at the interface of environmental and agricultural regulations, hence game farmers take advantage of loopholes in these institutional arrangements to forge ahead,” Dr Kamuti said.

He further went on to say that the state lacked a coherent plan for the South African countryside, “as shown by the outstanding land restitution and labour tenant claims on privately owned land earmarked for wildlife production”.

The South African government was confronted with a context in which the status quo of the prosperity of the middle classes under neoliberal policies was pitted against the urgent need to improve the material well-being of the majority poor.  Unless such issues were addressed, this necessarily undermined democracy as a participatory social force, Dr Kamuti said.

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