Re: Gravitational red-shifting in the biggest star. What are the real colors?

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Sujet : Re: Gravitational red-shifting in the biggest star. What are the real colors?
De : hertz778 (at) *nospam* gmail.com (rhertz)
Groupes : sci.physics.relativity
Date : 29. Sep 2024, 18:05:40
Autres entêtes
Organisation : novaBBS
Message-ID : <b348ae419e5bdb4f3fbfe00cf3be20d0@www.novabbs.com>
References : 1 2 3 4
User-Agent : Rocksolid Light
On Sun, 29 Sep 2024 13:57:22 +0000, J. J. Lodder wrote:

Paul.B.Andersen <relativity@paulba.no> wrote:
>
Den 28.09.2024 04:34, skrev rhertz:
This link illustrates a bit:
>
https://en.wikipedia.org/wiki/Gravitational_redshift
>
Using the most common formula from that link: "To first approximation,
gravitational redshift is proportional to the difference in
gravitational potential divided by the speed of light squared"
>
?f/f = ??/? = z = GM/c? (1/R - 1/r) = ?(R)/c? - ?(r)/c?
>
  ??/? = GM/Rc?  observed at infinity  (r -> ∞)
>
https://www.space.com/41290-biggest-star.html
>
G = 6.6743E?11 m^3 kg^?1 s^?2
M = 5E+09 x 1.989E+30 Kg = 9.945E+39 Kg
R = 1,700 x 634,000 Km = 1,077,800,000,000 m
>
>
?(R)/c? = 6,842,736.59
>
 From whence did you get the idiotic idea that the mass
of UY Scuti was 5 billion solar masses? :-D
>
M = 30 solar masses =  5.967e31 kg
R = 696340e3?1700 m = 57868e6 m
c = 299792458 m/s
>
??/? = GM/Rc? = 7.65e-7
>
Which is less than the red shift from the Sun.
>
>
In comparison, ?(RSun)/c? = 0.000002327
>
M = 1.989E+30 kg
R = 696340e3 m
>
??/? = GM/Rc? = 2.12e-6
>
>
>
>
WHAT IS WRONG WITH MY CALCULATIONS, BASED ON THE WIKI LINK?
>
Now you know.
>
He is looking for trouble where none exists.
Even for neutron stars you get a nice finite gravitational redshift,
which is 'easily' observable. For example:
<https://pubmed.ncbi.nlm.nih.gov/12422210/>
>
They find a redshift value of z = 0.35 ,
which is consistent with standard neutron star models,
(but not with some exotic ones)
>
Jan
>
(such a large gravitational redshift dwarfs any possible Doppler shift)
/////////////////////////////////////////////////////////////////////
You forgot to read this, don't you? I posted it two posts above.
............................
In 2021, Mediavilla (IAC, Spain) & Jiménez-Vicente (UGR, Spain) were
able to use measurements of the gravitational redshift in quasars up to
cosmological redshift of z ≈ 3 to confirm the predictions of Einstein's
equivalence principle and the lack of cosmological evolution within
13%.[28]
---------------------------------------------------

Date Sujet#  Auteur
27 Sep 24 * Gravitational red-shifting in the biggest star. What are the real colors?15rhertz
28 Sep 24 `* Re: Gravitational red-shifting in the biggest star. What are the real colors?14rhertz
28 Sep 24  +* Re: Gravitational red-shifting in the biggest star. What are the real colors?3rhertz
28 Sep 24  i`* Re: Gravitational red-shifting in the biggest star. What are the real colors?2rhertz
29 Sep 24  i `- Re: Gravitational red-shifting in the biggest star. What are the real colors?1rhertz
28 Sep 24  +- Re: Gravitational red-shifting in the biggest star. What are the real colors?1Paul.B.Andersen
29 Sep 24  `* Re: Gravitational red-shifting in the biggest star. What are the real colors?9Paul.B.Andersen
29 Sep 24   +* Re: Gravitational red-shifting in the biggest star. What are the real colors?2J. J. Lodder
29 Sep 24   i`- Re: Gravitational red-shifting in the biggest star. What are the real colors?1rhertz
29 Sep 24   `* Re: Gravitational red-shifting in the biggest star. What are the real colors?6rhertz
29 Sep 24    +* Re: Gravitational red-shifting in the biggest star. What are the real colors?4J. J. Lodder
29 Sep 24    i`* Re: Gravitational red-shifting in the biggest star. What are the real colors?3rhertz
30 Sep 24    i +- Re: Gravitational red-shifting in the biggest star. What are the real colors?1ProkaryoticCaspaseHomolog
30 Sep 24    i `- Re: Gravitational red-shifting in the biggest star. What are the real colors?1Paul.B.Andersen
29 Sep 24    `- Re: Gravitational red-shifting in the biggest star. What are the real colors?1Paul.B.Andersen

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