[vsnet-chat 2599] Re: errors in old spectral surveys

[Taichi Kato <tkato>]

Re: [vsnet-chat 2596] Re: errors in old spectral surveys

Brian Skiff wrote:

> This led to B-type stars being misclassed as type F, since their hydrogen lines
> are of similar strength (the early-B stars will show no H&K, except for
> sometimes a weak interstellar K line, whereas in F stars H&K are quite strong),
> and a moderately-reddened B star will have about the same overall spectral
> curve as an unreddened F stars (and remember before 1930 there was no
> convincing evidence of reddening at all!).  Plenty of B stars are given as F

   I'm not sure whether this is one of classic examples, but I have noticed
that Cyg X-1 = V1357 Cyg was classifed as "G5" in SAO (= SAO 69181).
The HD Catalog gave a more correct classification of type B.

Regards,
Taichi Kato

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