On Mar 14, 12:37 am, canopus56 wrote:
brucegooglegroups wrote in news:ccd8d894-
:

On occasion I see color in stars when viewing with binoculars. For
example, Arcturus is white with some blue and red. Is this true color
or chromatic abberation?
Bruce

The short answer is, yes, it's real. For example, compare Arcturus and
Sirius. Everyone can agree that in binoculars or to the naked-eye, they
have a different color. The problem is that there is so much individual
variation in the responsiveness of the human eye, that not everyone sees
the same colors. This caused endless disagreements among prominent
historical astronomers during the 1700s and 1800s before the widespread
distribution of useable spectometers. There's a good discussion of this in
an older book, Colours of the Stars by David Malin and Paul Murdin (1984).

- Canopus56

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In the same evening I would see "normal colors" ( white or orange-
yellow) and only see the red, blue, colors on a few stars- such as
Arcturus or Izar. I will read the book.
Thanks.
Bruce