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Astronomy

Questions tagged [luminosity]

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Questions regarding the amount of energy produced by an object per unit of time.

140 questions
Newest Active Bountied Unanswered
0 votes
0 answers
76 views

This question is based on the assumption that, during the first several hundred million years, a sufficiently massive planet undergoes vigorous volcanic activity that produces a predominantly carbon ...
Imyaf's user avatar
  • 339
-1 votes
1 answer
385 views

Why is the luminosity of Sirius less than Polaris, yet Sirius is claimed the brightest star in the sky? I read that Sirius is the brightest star in the sky however am reading some conflicts that ...
Nick's user avatar
  • 111
3 votes
1 answer
685 views

I am really confused on how to estimate the luminosity of a made-up star through its lifetime, like say a star with the mass of 0.902 suns, how would I find the luminosity of it say, 6.5 billion years ...
Sayon Meares's user avatar
  • 39
2 votes
1 answer
59 views

I have estimated the bolometric luminosity of an accreting BH (from a model) as $$L_{bol}= \eta \dot{M}_{BH}c^2,$$ where $\eta$ is the radiative eficciency, $\dot{M}_{BH}$ the accretion rate of the BH ...
Matías Liempi's user avatar
  • 55
5 votes
1 answer
237 views

Why is luminosity of a star with degenerate core and He or H shell burning (RG, AGB or between Post-AGB and PN phase) given solely by the core mass? I understand that the relation is a stable result ...
Leos Ondra's user avatar
  • 984
2 votes
1 answer
375 views

My main objective is to find the radius(or relative size) of the stars from the Gaia DR3 archive. However as I was unable to query the radius directly I am looking into the Stefan-Bolzmann Law which ...
Shromi's user avatar
  • 141
0 votes
0 answers
178 views

I have M_UV(absolute UV magnitudes) and redshifts of some high z sources and I want to fit UVLF for them. ...
Walker's user avatar
  • 109
2 votes
0 answers
82 views

I have the values from B, V and R filters. How do I obtain the total luminescence of a star? My ultimate aim is to find the relative masses and luminescence of various stars/galaxies in a galactic ...
Angela's user avatar
  • 337
3 votes
1 answer
213 views

I would like to calculate the density of MW-like galaxies using the double Schechter luminosity function: $ \Phi(m) d m=\left[\phi_1\left(\frac{m}{m_*}\right)^{\alpha_1}+\phi_2\left(\frac{m}{m_*}\...
Sumedha Biswas's user avatar
  • 33
1 vote
1 answer
321 views

I have the dust-corrected luminosity in the Ks band in the unit erg/s/Hz. I want to convert it to erg/s. I would like to know which method is correct: $L[erg/s]=L[erg/s/Hz]\times(C/\lambda)$ $L[erg/s]...
Fatemeh Abedini's user avatar
  • 11
1 vote
1 answer
179 views

I understand that each scale you go up on the absolute magnitude scale, the luminosity decreases by the fifth root of 100, or around 2.512. Is there a name for the constant 2.512, or not. Also, is the ...
Astrovis's user avatar
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4 votes
1 answer
433 views

Say I have a star with radius $R$ and luminosity $L$. I want to find the frequency of its peak emission. Taking the star as a perfect blackbody, we can use Stefan-Boltzman to see that $$L = 4\pi R^2\...
Captain Chicky's user avatar
  • 143
1 vote
0 answers
82 views

Is it possible to calculate the star's luminosity based on the data in the Hipparcos catalogue? Currently I'm using this algorithm, I have even fitted the bolometric correction to the Johnson V band (...
someCO_OLguy's user avatar
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1 vote
0 answers
170 views

I am trying to calculate the absolute magnitude of a solar system object, given its albedo, and assuming all of its luminosity comes from reflecting light from the sun. Using $L_{sun}$ = solar ...
CuriousCosmos's user avatar
  • 41
2 votes
1 answer
83 views

I'm a big fan of astrophysics and astronomy. However i'm quite confused by reading these last years plenty of books on the subject with various definitions (vocabulary) and notations for the same ...
Vincent ISOZ's user avatar
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