Re: [nbos] Stellar Radius - Mass - Luminosity Parameters.
Charles Sykora
Thu Feb 21st, 2008
Dalton, have you checked the star database at Celestia? It may have
some of the missing values in the star catalog.
--Dale--

On Feb 21, 2008, at 10:22 AM, Dalton Calford wrote:

> Thanks everyone who replied.
>
> I have a series of values already, as long as the star is within a
> particular format, unfortunately, not all of the stars listed fit that
> format.
>
> I was thinking about posting the values I have to the wiki, along with
> the star data so that we can get some of us working on it together.
>
> What does everyone think of this idea?
>
> I am hoping to have a detailed csv created that includes all the stars
> within 10000 ly detailing multiples and other such data.
>
> The original lists posted up at nox are a bit out of date and are
> missing a great deal of the new stars found within that radius.
>
> For example the nox 10000ly+ file lists 87,000 stars, while the new
> data
> has over 120,000 stars in that same volume of space.
>
> I have about 2,300 stars that need reviewing to properly gauge what
> they
> are.
>
> As the data holds all the catalog numbers etc, it would require
> someone
> to look up the particular star, ensure we have the right data for
> it and
> update the wiki for that one entry.
>
> here is a sample of stars that don't match up with known values
>
> A0Ia comp
> A0Ia(p)
> A0Ia0
> A0Ia:
> A0Iab
> A0Iab-Ib
> A0Iae
> A0MNp...
> A0V + A2V
>
> Now, we may find that some are actually two stars or that it is a
> standard star which I don't have the proper values for.
> It could also be as simple as a typo in the starlist.
>
> I still need the formula's but I would like to get feedback as to
> whether people are willing to help and if the nbos wiki is the best
> place to perform the work.
>
> best regards
>
> Dalton
>
> On Thu, 2008-02-21 at 09:31 +1100, Justin Akkerman wrote:
>> From: "Dalton Calford" <dcalford-at-distributel.ca>
>> Subject: [nbos] Determining Stellar Values
>>
>> But I need a formula for the Mass and Radius of the Star,
>> given the
>> above data.
>>
>> Does anyone know how to get this information (expressed as an
>> excel
>> formula if possible)
>>
>> I will look thses values up in my University Astrophysics text
>> tonight. If I recall, the formulas relating radius mass and
>> luminosity
>> will only be working if it is main sequence. For example when a star
>> goes red giant, it does not gain any mass but its radius puffs up
>> greatly.
>>
>> Can I post excel files to this forum?
>>
>> If not I will make sure that they are excel friendly.
>>
>> Justin.
>>
>>
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>>
>>
>
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>
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