Latest News Archive

Please select Category, Year, and then Month to display items
Previous Archive
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

Academic delivers inaugural lecture on South African foreign policy
2007-08-06

 

In her inaugural lecture Prof. Heidi Hudson from the Department of Political Sciences, focused on the impact that Pan-Africanist sentiments have had on South Africa’s foreign policy. She also put the resulting contradictions and ambiguities into context. At her inaugural lecture were, from the left: Proff. Frederick Fourie (Rector and Vice-Chancellor of the UFS), Heidi Hudson, Engela Pretorius (Vice-Dean: Faculty of The Humanities) and Daan Wessels (Research Associate in the Department of Political Science).
Photo: Stephen Collett

Academic delivers inaugural lecture on South African foreign policy

“We are committed to full participation as an equal partner … opposed to any efforts which might seek to project South Africa as some kind of superpower on our continent. … the people of Africa share a common destiny and must therefore … address their challenges … as a united force...” (Mbeki 1998:198-199).

Prof. Heidi Hudson from the Department of Political Science referred to this statement made by president Mbeki (made at the opening of the OAU Conference of Ministers of Information in 1995) when she delivered her inaugural lecture on the topic: South African foreign policy: The politics of Pan-Africanism and pragmatism.

One of the questions she asked is: “Can the South African state deliver democracy and welfare at home while simultaneously creating a stable, rules-based African community?”

She answers: “South Africa needs to reflect more critically and honestly on the dualism inherent in its ideological assumptions regarding relations with Africa. South Africa will always be expected by some to play a leadership role in Africa. At the moment, South Africa’s desire to be liked is hampering its role as leader of the continent.”

In her lecture she highlighted the ideological underpinnings and manifestations of South Africa’s foreign policy. Throughout she alluded to the risks associated with single-mindedly following an ideologically driven foreign policy. She emphasised that domestic or national interests are the victims in this process.

Prof. Hudson offers three broad options for South Africa to consider:

  • The Predator – the selfish bully promoting South African economic interest.
  • Mr Nice Guy – the non-hegemonic partner of the African boys club, multilaterally pursuing a pivotal but not dominant role.
  • The Hegemon - South Africa driving regional integration according to its values and favouring some African countries over others, and with checks and balances by civil society.

She chooses option three of hegemony. “Politically correct research views hegemony as bad and partnership as good. This is a romanticised notion – the two are not mutually exclusive,” she said.

However, she states that there have to be prerequisites to control the exercise of power. “The promotion of a counter-hegemon, such as Nigeria, is necessary. Nigeria has been more effective in some respects than South Africa in establishing its leadership, particularly in West Africa. Also needed is that government should be checked by civil society to avoid it sinking into authoritarianism. The case of business and labour coming to an agreement over the HIV/Aids issue is a positive example which illustrates that government cannot ignore civil society. But much more needs to be done in this regard. South Africa must also be very careful in how it uses its aid and should focus potential aid and development projects more explicitly in terms of promoting political stability,” she said.

Prof. Hudson said: “It is also questionable whether Mbeki’s Afro-centrism has in fact promoted the interests of ordinary citizens across Africa. Instead, elite interests in some countries have benefited. But ultimately, the single most important cost is the damage done to the moral code and ethical principles on which the South African Constitution and democracy is founded.

“In the end we all lose out. More pragmatism and less ideology in our relations within Africa may just be what are needed,” she said.

We use cookies to make interactions with our websites and services easy and meaningful. To better understand how they are used, read more about the UFS cookie policy. By continuing to use this site you are giving us your consent to do this.

Accept