Re: [nbos] Stellar Radius - Mass - Luminosity Parameters.
"Mike Oliver"
Wed Feb 27th, 2008
I don't know if this is helpful but, from Norton's Star Atlas (Epoch
1950), I quote the following: "'Type B', 'Type A', etc, when used in the
general sense, or in statistical work, does not usually mean the series
B0 to B9, or A0 to A9, but an average Type, in which A0, B0, etc., are
approximately central, including the latter half of those lettered in
the Type earlier, just as '2nd magnitude' is not 2.0 to 2.9 but 1.5 to

I believe that, in addition, some stars are designated A0 II-III which
could mean either that the star can not be definitely placed either as a
II or a III. Also stars with variable spectra can have a "v" appended
and the specific sub-category omitted. However, I can't say for sure
that this is a general rule.

Certainly, where there are doubts about anything, I think there is a
tendency for the astronomer using the terminology to be vague.

Could you give me any catalogue references for any of these stars and
I'll see if I can get anything more specific.



-----Original Message-----
[] On Behalf Of Dalton Calford
Sent: 27 February 2008 16:36
Subject: Re: [nbos] Stellar Radius - Mass - Luminosity Parameters.

I have many stars in my list that are just listed in a manner such as
"A" instead of "A0I"

I guess the astronomers where saying it is a type A star but that they
could not determine exactly what kind.

How should I treat these stars?

Does anyone have any suggestions?

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