First cycle
degree courses
Second cycle
degree courses
Single cycle
degree courses
School of Science
Course unit
SCN1032616, A.A. 2017/18

Information concerning the students who enrolled in A.Y. 2017/18

Information on the course unit
Degree course Second cycle degree in
SC1173, Degree course structure A.Y. 2010/11, A.Y. 2017/18
bring this page
with you
Degree course track ASTRONOMIA [001PD]
Number of ECTS credits allocated 6.0
Type of assessment Mark
Course unit English denomination ASTRONOMICAL SPECTROSCOPY
Website of the academic structure
Department of reference Department of Physics and Astronomy
Mandatory attendance
Language of instruction English
Single Course unit The Course unit can be attended under the option Single Course unit attendance
Optional Course unit The Course unit can be chosen as Optional Course unit

Teacher in charge PIERO RAFANELLI FIS/05
Other lecturers STEFANO CIROI FIS/05

Course unit code Course unit name Teacher in charge Degree course code

ECTS: details
Type Scientific-Disciplinary Sector Credits allocated
Core courses FIS/05 Astronomy and Astrophysics 6.0

Mode of delivery (when and how)
Period Second semester
Year 1st Year
Teaching method frontal

Organisation of didactics
Type of hours Credits Hours of
Hours of
Individual study
Lecture 6.0 48 102.0 No turn

Start of activities 26/02/2018
End of activities 01/06/2018

Prerequisites: Basic Physics I and II, Calculus I and II, Atomic Physics, Astrophysics I - II
Target skills and knowledge: Basics of physics necessary for the interpretation of the physical features of gaseous nebulae through spectroscopic investigation
Examination methods: oral

oral exame, eventually integrated by the presentation of a topic related to the program me agreed in advance with the teacher
Assessment criteria: test on the capability to use the physical concepts necessary to exctract information from the spectra of gaseous nebulae
Course unit contents: Radiation in the interstellar gas: definition of radiative terms; transfer equation; local thermodynamic equilibrium; equivalent thermodynamic equilibrium.
Emission and absorption lines in the interstellar environment: emission and absorption coefficients; statistic equilibrium; collisional processes and kinetic temperature; excitation in interstellar conditions; forbidden lines; recombination lines; intensity of lines as a function of density and temperature.
Continuum emission and absorption processes: free-free transitions; intensity of the thermal radio continuum; bound-free and free-bound transitions; synchrotron radiation.
Ionization: ionization equilibrium; ionization of hydrogen; HII regions; ionization of helium; dust extinction; HI regions; ionization of the heaviest elements.
Formation and dissociation of interstellar molecules: molecular hydrogen; CO, OH, H2O in diffuse nebulae; molecules in dense nebulae.
Thermal equilibrium and kinetic temperature of gas: Equation of thermal equilibrium; heating and cooling processes of gas; thermal equilibrium of HII regions; thermal state of HI regions.
Planned learning activities and teaching methods: Lectures

Exercises on observational data
Additional notes about suggested reading: Textbook and lecture notes of the teacher
Textbooks (and optional supplementary readings)
  • Osterbrock, D.E., Astrophysics of Gaseous Nebulae and Active Galactic Nuclei. --: --, --. Cerca nel catalogo