The article “Models for Velocity Decrease in HH34,” written by L. Zaninetti, was chosen to address project goals and learning outcomes acquired from Lab Class. The aim to get knowledge of the basic concepts of physical science and prepare for the utilization of theories in real-life scenarios can be achieved by studying profoundly scientific findings. The paper “Models for Velocity Decrease in HH34” presents an opportunity to assess relevant applications extracted from physical principles and understand the cause and effect relationships between objects and their synergies. This paper will summarize the critical points of the proposed article written by L. Zaninetti and discuss the main theoretical questions and practical results of the research.
The article states that the Herbig-Haro objects (HH) were studied and evaluated by different researchers, utilizing the equation of motion that is relevant to the understanding of the physics of the HH objects. Initially, theoretical articles were not used in the magnetic field, but further analysts found that there are specific parameters of the objects related to the magnetic field. Nevertheless, scientific reports have left several essential questions that should be addressed further. Thus, Zaninetti states that several questions should be answered. First, is there a possibility to find the equation of motion for turbulent flow with an intermediary of density that reduces as a scaling law? Second, is there an opportunity to implement the back reaction in the equation of motion
to reconstruct the radiative emis? ion? The third and fourth questions asked whether the deflection of the “superjet” can be sampled with HH34, whether the theory of the image can give knowledge on the bow shock that is observed in HH34.
To address these questions, Zaninetti, in the article, used the examinations of HH34’s velocity over the intervals of 9 years. Further, the researcher investigated two probable sampling models that were based on Newton’s and Stoke’s laws of resistance. As a third step, the conservation of the energy flow in turbulent jets was implemented to reveal the equation of motion. Fourthly, the sampling of the extended area of the HH34 objewhichthat is named “superjet”, was conducted (Zaninetti, 2019). Finally, as the last step, the researcher discussed analytical and numerical principles that helped to create the image of HH34.
The execution of the actions mentioned above delivered the following results. It was found that when creating a model, using the third law of motion for turbulent jets while introducing an intermediary with a density that reduces with a scaling law, it saves the flux of energy. Second, it was discovered that the back reaction introduced in the equation of motion contributes to the creation of a limited length of the jet. The “superjet” sampling can be created by the combination of the declining velocity of a turbulent jet and the inclination of the main object with its stable, constant speed. The bow shock process that is observed in HH34 can be reconstructed when two emitting areas from the plane in the sky cross each other. The effect can be achieved with the usage of the image theory applied to specific mathematical knots.
Overall, it can be stated that the article’s discussion contributes to the knowledge that was gathered during the Lab Class. The report shows how the application of fundamental physics principles and laws helps to model the effects and processes of objects and resolve issues to get practical applications. The paper by Zaninetti utilizes laws of motion and resistance that were discussed profoundly and serves as a great example to assess concepts of physics further.
References
Zaninetti, L. (2019). Models for Velocity Decrease in HH34. International Journal of Astronomy and Astrophysics, 9, 302-320.