This problem requires you to read the following recently published
scientific article:
Measuring the ionisation fraction in a jet from a massive protostar.
Fedriani, R., Caratti o Garatti, A., Purser, S.J.D. et al. Nat Commun
10, 3630 (2019).
Link: https://www.nature.com/articles/s41467-019-11595-x.pdf
Answer the following questions related to this article:
(a) Why are massive stars important for the development of the
universe?
(b) How can the ionised part of jets be observed?
(c) What kind of region is G35.2N? Describe how it is structured.
(d) What is the ionisation fraction χe and how do the authors
calculate its value?
(e) How is the mass-loss rate being determined for knots K3 and K4?
Why not for K1 and K2?
(f) Why is the ionisation fraction so small for G35.2N?
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