First cycle
degree courses
Second cycle
degree courses
Single cycle
degree courses
School of Science
ASTRONOMY
Course unit
ASTRONOMY 2 (MOD. B)
SCP4068137, A.A. 2017/18

Information concerning the students who enrolled in A.Y. 2015/16

Information on the course unit
Degree course First cycle degree in
ASTRONOMY
SC1160, Degree course structure A.Y. 2008/09, A.Y. 2017/18
N0
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Number of ECTS credits allocated 6.0
Type of assessment Mark
Course unit English denomination ASTRONOMY 2 (MOD. B)
Website of the academic structure http://astronomia.scienze.unipd.it/2017/laurea
Department of reference Department of Physics and Astronomy
Mandatory attendance
Language of instruction Italian
Branch PADOVA

Lecturers
Teacher in charge PIERO RAFANELLI FIS/05

Integrated course for this unit
Course unit code Course unit name Teacher in charge
SCP4068135 ASTRONOMY 2 PIERO RAFANELLI

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

Mode of delivery (when and how)
Period Annual
Year 3rd Year
Teaching method frontal

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

Calendar
Start of activities 02/10/2017
End of activities 15/06/2018

Examination board
Examination board not defined

Syllabus

Common characteristics of the Integrated Course unit

Prerequisites: Basic Physics I and II, Calculus I and II, Atomic Physics, Astronomy
Target skills and knowledge: Acquire ability in the use of the basics of physics necessary for the interpretation of the physical features of stellar atmospheres through spectroscopic investigation
Examination methods: oral

oral exame, eventually integrated by the presentation of a topic related to the program agreed in advance with the teacher
Assessment criteria: test on the capability to use the physical concepts necessary to exctract information from stellar spectra

Specific characteristics of the Module

Course unit contents: LECTURES ON PHYSICS OF STELLAR ATMOSPHERES

Specific Intensity
Black Body
Radiative energy transport through a GAS VOLUME with absorption and emission
The source function Sλ
Absorption versus emission lines
Transport equation
Transport along a ray
Radiative transfer equation
The fluxes
Surface flux and effective temperature
Flux F and the anisotropy of the radiation field
Radiation density
Depth dependence of the source function
Radiative equilibrium
Theoretical temperature stratification in a grey atmosphere in radiative equilibrium
Dependence of the temperature T from the optical depth
Continuous absorption of hydrogen atoms
Different absorption process of hydrogen
Boltzmann equation
Saha equation
The H- absorption coefficient in the Sun
Helium absorption in the Sun
Metallic absorption in the Sun
Absorption coefficients for A and B stars
Influence of the non greyness of the absorption coefficient
Dependence of the Balmer discontinuity on temperature and electron density
Formation of optically thin lines
Profile of an optically thin absorption line
Doppler broadening
Voigt profile
Equivalent widths for optically thin lines
Optically thick lines
Curve of growth
Influence of the Doppler width on the curve of growth
The influence of Sλ (Tc = 0) on the curve of growth
Theoretical curve of growth
Hydrogen lines
Balmer jump and hydrogen lines
Determination of temperature, density and gravity at the surface of a star
Planned learning activities and teaching methods: Lectures

Exercises on observational data
Additional notes about suggested reading: Lecture notes of the teacher and textbook
Textbooks (and optional supplementary readings)
  • Boehm- Vitense, E., Stellar Astrophysics, Vol. 2. Cambridge, UK: Cambridge University Press, 1989. Cerca nel catalogo