Re: (IAAC) Stars with spectral type F and G in NGC 6231
Since you reference my observation, I looked up in my records and
indeed, one of my 2 recorded observations has some mention of yellow
Perceived colors of stars can be quite variable. In the double star
observing group I participate in (http:// www.s33.org ) we have had a
number of discussions regarding stellar colors, both in general as well
as in regard a particular pair. In addition to the obvious factor of
spectral type, perceived colors can be influenced by colors of other,
nearby stars, intervening gas and dust, atmospheric conditions, as well
as the visual acuity of the observer. There has also been some
speculation that cultural factors could influence who a particular
observer sees (and reports) colors.
From my location, this cluster is rather low on the horizon and over a
rather light polluted section of sky. In particular, there are quite a
lot of sodium vapor lights on the freeway a couple of miles away as
well as business adjacent to the freeway. The light from these could
very well affect the perception of color.
On Thursday, July 3, 2003, at 08:33 AM, Jorge Solera Marin (via Lew
> Last night I was observing the open cluster NGC 6231. Between its main
> stars I could observe that some even showed to yellow color or orange.
> In this Web, it appears a observacional report of William L. Schart,
> in which also it says to observe stars of this spectral type.
> Nevertheless, in several data bases, I have been able to state that
> all the stars have spertral type O or B. Somebody can clarify this
> apparent contradiction to me.
> Thank you very much,
> Jorge Solera
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