Stellar reddening via Av calculation

  • Context: Undergrad 
  • Thread starter Thread starter bruha
  • Start date Start date
  • Tags Tags
    Calculation Stellar
Click For Summary
SUMMARY

This discussion focuses on the calculation of stellar reddening via interstellar extinction, specifically examining the values of Av for stars like Betelgeuse and Deneb. The calculated Av for Betelgeuse is 1.12 mag and for Deneb is 0.11 mag, which contradicts literature values that suggest Av can reach 5-10 mag or more. The discrepancy arises from uncertainty regarding whether the apparent and absolute magnitudes used in calculations account for extinction. The discussion highlights the need for clarity in the source of these magnitudes.

PREREQUISITES
  • Understanding of stellar magnitudes (apparent and absolute)
  • Knowledge of interstellar extinction and its effects on stellar observations
  • Familiarity with equations related to Av calculation, such as Av (mag) = 2*d(kpc)
  • Basic concepts of variable stars and their brightness measurements
NEXT STEPS
  • Research the methods for calculating interstellar extinction in detail
  • Explore the implications of variable stars on apparent and absolute magnitudes
  • Study the equations for Av calculation in different latitude contexts
  • Examine literature on stellar reddening to compare methodologies and results
USEFUL FOR

Astronomers, astrophysicists, and students studying stellar properties and interstellar medium effects on light propagation will benefit from this discussion.

bruha
Messages
394
Reaction score
525
Hello, please do somebody have some experiences with calculating of stellar reddening via interstellar extinction? I made some calculation based on apparent and absolute magnitudes and distances of brigthtness star but maximum Av which I got for Betelgeuse was 1.12 mag ( for its maximum apparent magnitude since it is variable star) and for Deneb 0.11 mag.
This results are in disagreement with Av presented in literature which reached values at least about 5-10 mag or more ( for example I found some equation Av (mag) = 2*d(kpc) for latitude b to 2 o and Av (mag) = 0.18/sin (b) for b over 10 o...
Thank you very much
 
Astronomy news on Phys.org
Hello,
thank you. I can say that maybe , here is problem that is not clear if apparent and absolute magnitudes which I found posted on net are these calculated according to equation which neglected extinction or these which was real measured.

Thank you
T.Bruha
 

Similar threads

Undergrad Abundant water from primordial supernovae at cosmic dawn
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Compute the total stellar mass from a galaxy with Red Giants
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad How to calculate absolute magnitude of a stellar body?
  • · Replies 6 ·
Replies
6
Views
4K
Undergrad How to Calculate Distances and Luminosities of Stars?
  • · Replies 1 ·
Replies
1
Views
3K
How Far Is the Star Cluster with Apparent Magnitude 15 mag and B-V of 1.39 mag?
  • · Replies 7 ·
Replies
7
Views
2K
Combined magnitudes of two solar-type stars
  • · Replies 6 ·
Replies
6
Views
2K
Too Much Stellar Flux: Fixing a 25-year old Problem
  • · Replies 9 ·
Replies
9
Views
4K
Graduate Calculating Distance to Cefeide Star w/ Stellar Extinction
  • · Replies 3 ·
Replies
3
Views
6K
Graduate Calculate the uncertainty of the distance to the clusters?
  • · Replies 1 ·
Replies
1
Views
4K
Properties of a Star Homework help
  • · Replies 3 ·
Replies
3
Views
2K