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From: hertz778@gmail.com (rhertz)
Newsgroups: sci.physics.relativity
Subject: Re: Gravitational red-shifting in the biggest star. What are the real
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Date: Sun, 29 Sep 2024 17:02:03 +0000
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On Sun, 29 Sep 2024 11:42:18 +0000, Paul.B.Andersen 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"
>>
>> Δf/f = Δλ/λ = z = GM/c² (1/R - 1/r) = Φ(R)/c² - Φ(r)/c²
>
>   Δλ/λ = GM/Rc²  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
>>
>>
>> Φ(R)/c² = 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
>
> Δλ/λ = GM/Rc² = 7.65e-7
>
> Which is less than the red shift from the Sun.
>
>>
>> In comparison, Φ(RSun)/c² = 0.000002327
>
> M = 1.989E+30 kg
> R = 696340e3 m
>
> Δλ/λ = GM/Rc² = 2.12e-6
>
>
>
>>
>> WHAT IS WRONG WITH MY CALCULATIONS, BASED ON THE WIKI LINK?
>
> Now you know.

***************************************************************
QUOTE:
--------------------------------------------------------------------
The biggest star in the universe (that we know of), UY Scuti is a
variable hypergiant with a radius around 1,700 times larger than the
radius of the sun.


To put that in perspective, the volume of almost 5 billion suns could
fit inside a sphere the size of UY Scuti.


The star lies near the center of the Milky Way, roughly 9,500
light-years away from Earth. Located within the constellation Scutum, UY
Scuti is a hypergiant star. Hypergiants — larger than supergiants and
giants — are rare stars that shine very brightly. They lose much of
their mass through fast-moving stellar winds.


https://www.space.com/41290-biggest-star.html
**************************************************************

You didn't even try to read the OP, from where I extracted the data,
idiot.

This is another link:

Star UY Scuti is so big, you could fit 5 billion Suns inside it

https://www.skyatnightmagazine.com/space-science/uy-scuti



Here it's claimed that they don't have a clue about its mass:

https://en.wikipedia.org/wiki/UY_Scuti


So, rela-astrophysicists come out with any shit, as they are not
accountable for what they publish.