Recent content by heavystray

  1. heavystray

    B Why does Tc & Teff Differ for Different Types of Stars?

    Ok i understood. Thanks but is there any particular reason that Tc is significantly higher than Te for hot stars while lower for cooler stars?
  2. heavystray

    B How do you calculate the uncertainty in T using graphs?

    if we use the above eq. when m(B-V)= 1.2, T= 3930 when m(B-V)= 1, T= 4420 when m(B-V)= 1.4, T= 3530 so the uncertainty of T= is 4420-3530? OR we have to do it separately on both sides? upper uncertainty= 3920-3530 lower uncertainty= 4420-3920 Thanks
  3. heavystray

    B Why does Tc & Teff Differ for Different Types of Stars?

    I have a question regarding the results of my Physics investigation on Tc and Teff of stars. I found that the colour temperature that I calculated is significantly higher than the Teff for O and B stars. For mid temp stars, Tc is still more than Teff but the difference in small. But for cooler...
  4. heavystray

    B How do you calculate the uncertainty in T using graphs?

    wait, how do you find the 4960?
  5. heavystray

    B How do you calculate the uncertainty in T using graphs?

    if we use the above eq. when m(B-V)= 1.2, T= 3930 when m(B-V)= 1, T= 4420 when m(B-V)= 1.4, T= 3530
  6. heavystray

    B How do you calculate the uncertainty in T using graphs?

    if we use the above eq. when m(B-V)= 1.2, T= 3930 when m(B-V)= 1, T= 4420 when m(B-V)= 1.4, T= 3530 so the uncertainty of T= is 4420-3530? OR we have to do it separately on both sides? upper uncertainty= 3920-3530 lower uncertainty= 4420-3920 Thanks
  7. heavystray

    B How do you calculate the uncertainty in T using graphs?

    Wait, I'm really sorry, the equation supposed to have minus one after e, that's why i can't solve for T in terms of m(B-V) numerically. sorry again for uploading the wrong eq. thanks for the reply
  8. heavystray

    B How do you calculate the uncertainty in T using graphs?

    what do you mean the for T is monotone? so the range would be divided by two right? thanks for the reply
  9. heavystray

    B Choice of pair of filters

    yes it's easier to measure, but the question is, why does it affect the accuracy of temperature calculated based on the star's U-/B/B-V/V-R?? because we're just going to get either lower or higher values of B-V, V-R, R-I which correspond to temperatures. I mean for cooler stars, we already...
  10. heavystray

    B Choice of pair of filters

    but the question is, why does it affect the accuracy of temperature calculated based on the star's U-/B/B-V/V-R?? because we're just going to get either lower or higher values of B-V, V-R, R-I which correspond to temperatures. I mean for cooler stars, we already expected their U-B will be low...
  11. heavystray

    B How do you calculate the uncertainty in T using graphs?

    ughh thanks for pointing that out, sorry!
  12. heavystray

    B Choice of pair of filters

    Hi, in determining the temperature of stars using colour index (U-B,B-V,V-R, etc), why do we need to use the appropriate pairs of filters based on their range of temperature? (this is what i read from wiki) For cool stars, we use R-I, and for hotter stars, we use B-V. I don't understand how...
  13. heavystray

    B How do you calculate the uncertainty in T using graphs?

    i have an equation like this: Given m(B-V)= 1.2 +- 0.2 How do you calculate the uncertainty in T? (btw, I solve T using graphs by finding the intersection point) My idea was first to calculate T when m(B-V) =0.2, and I then calculate T when m(B-V)= 1.2 + 0.2(its uncertainty). and then find the...
  14. heavystray

    B Temperature based on colour index using Planck's law

    hmmm no..but i think it's ok for now...i'll just solve it using graph, thanks!
  15. heavystray

    B Temperature based on colour index using Planck's law

    How do you integrate it tho? It'd be great if you can show step by step on how to do it, thanks for answering.
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