Re: green stars

Newsgroups	sci.physics
Date	2015-10-05 08:30 -0700
References	<560E3D7D.3AA6@ix.netcom.com> <k8SdnVsCeckGUpPLnZ2dnUU7-S-dnZ2d@giganews.com> <nvM5yI.1sLq@kithrup.com> <7vednXPhGJlulZLLnZ2dnUU7-I2dnZ2d@giganews.com>
Message-ID	<17307eb3-4f42-4e9d-9def-e0d8090debab@googlegroups.com> (permalink)
Subject	Re: green stars
From	Angelo <patrizio.pan-2002@libero.it>

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Il giorno sabato 3 ottobre 2015 00:45:13 UTC+2, Sam Wormley ha scritto:
> On 10/2/15 5:18 PM, Dorothy J Heydt wrote:
> > As a matter of fact, I believe green stars aren't possible.  In
> > this universe anyway.
> 
>    One of the Alberio pair certainly looks green. Actually our sun peaks

Albireo's 'green' component might seem green or bluish
https://en.wikipedia.org/wiki/Albireo#/media/File:Albireo_20150919.jpg
" The brighter yellow star (actually itself a very close binary system) makes a striking colour contrast with its fainter blue companion star."
http://www.nightskyinfo.com/cms/img/archive-img/albireo/albireo.jpg
"The two components are known as Beta Cygni A and B. A is the primary member of the system, a golden yellow or "topaz" star shining at 3rd magnitude, while B is known as the companion, a fainter 5th-magnitude star with a beautiful bluish color."

The color we think to see is influenced by the other brighter component, 
similarly with Antares B component in Scorpius.

>    in yellow-green ligh

Never the less no one would say that it appears yellow-green.
If the Planckian Locus (below) is accurate, we won't see green in a 
'thermal' light source, i.e. in one that comes out of a black body 
emission:

https://en.wikipedia.org/wiki/Green_star_(astronomy)#/media/File:PlanckianLocus.png

Green+blue+red gives white, plus a tiny residual tinge if the the three 
are not properly balanced and, in any case, an unsaturated tinge.
Green could come out if some absorption lines (of sufficient intensities) 
are present in blue and red regions of the thermal source.

regards
Angelo

PS - Albireo is a blob name after an intermingling of Arabic, Latin, 
and Greek terms, so your misspelling may be forgivable.

Thread

green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-02 01:17 -0700
  Re: green stars Sam Wormley <swormley1@gmail.com> - 2015-10-02 08:19 -0500
    Re: green stars john <johnsefton288@gmail.com> - 2015-10-02 06:30 -0700
      Re: green stars Odd Bodkin <bodkinodd@gmail.com> - 2015-10-02 08:59 -0500
        Re: green stars benj <nobody@gmail.com> - 2015-10-02 12:24 -0400
          Re: green stars HVAC <mr.hvac@gmail.com> - 2015-10-05 10:19 -0700
        Re: green stars Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-10-03 12:14 +0200
  Re: green stars Yousuf Khan <bbbl67@spammenot.yahoo.com> - 2015-10-02 14:40 -0400
    Re: green stars djheydt@kithrup.com (Dorothy J Heydt) - 2015-10-02 22:18 +0000
      Re: green stars Sam Wormley <swormley1@gmail.com> - 2015-10-02 17:45 -0500
        Re: green stars Angelo <patrizio.pan-2002@libero.it> - 2015-10-05 08:30 -0700
      Re: green stars Gutless Umbrella Carrying Sissy <taustinca@gmail.com> - 2015-10-02 16:02 -0700
        Re: green stars djheydt@kithrup.com (Dorothy J Heydt) - 2015-10-03 02:29 +0000
          Re: green stars Gutless Umbrella Carrying Sissy <taustinca@gmail.com> - 2015-10-02 22:29 -0700
          Re: green stars Joy Beeson <jbeeson@invalid.net.invalid> - 2015-10-03 23:49 -0300
            Re: green stars "Mike Dworetsky" <platinum198@pants.btinternet.com> - 2015-10-04 08:48 +0100
              Re: green stars Cryptoengineer <treifamily@gmail.com> - 2015-10-04 11:07 -0500
                Re: green stars "Brian M. Scott" <b.scott@csuohio.edu> - 2015-10-04 12:50 -0400
                Re: green stars Gutless Umbrella Carrying Sissy <taustinca@gmail.com> - 2015-10-04 10:54 -0700
                Re: green stars "J. Clarke" <j.clarke.873638@gmail.com> - 2015-10-04 13:21 -0400
                Re: green stars Greg Goss <gossg@gossg.org> - 2015-10-04 11:15 -0600
                Re: green stars Stumpy <perilmung@spamnet.con> - 2015-10-05 13:39 -0700
            Re: green stars "Sea Wasp (Ryk E. Spoor)" <seawasp@sgeinc.invalid.com> - 2015-10-04 09:27 -0400
            Re: green stars William Vetter <mdhangton@gmail.com> - 2015-10-04 16:45 -0400
        Re: green stars Yousuf Khan <bbbl67@spammenot.yahoo.com> - 2015-10-03 17:40 -0400
          Re: green stars Gutless Umbrella Carrying Sissy <taustinca@gmail.com> - 2015-10-03 14:51 -0700
          Re: green stars djheydt@kithrup.com (Dorothy J Heydt) - 2015-10-03 21:54 +0000
            Re: green stars Gutless Umbrella Carrying Sissy <taustinca@gmail.com> - 2015-10-03 17:24 -0700
            Re: green stars wdstarr@panix.com (William December Starr) - 2015-10-04 06:46 -0400
              Re: green stars djheydt@kithrup.com (Dorothy J Heydt) - 2015-10-04 13:15 +0000
                Re: green stars jmfbahciv <See.above@aol.com> - 2015-10-04 14:27 +0000
                Re: green stars djheydt@kithrup.com (Dorothy J Heydt) - 2015-10-04 16:53 +0000
                Re: green stars jmfbahciv <See.above@aol.com> - 2015-10-05 13:02 +0000
                Re: green stars djheydt@kithrup.com (Dorothy J Heydt) - 2015-10-05 14:39 +0000
                Re: green stars jmfbahciv <See.above@aol.com> - 2015-10-06 13:34 +0000
                Re: green stars djheydt@kithrup.com (Dorothy J Heydt) - 2015-10-06 14:24 +0000
                Re: green stars jmfbahciv <See.above@aol.com> - 2015-10-07 13:18 +0000
                Re: green stars Yousuf Khan <bbbl67@spammenot.yahoo.com> - 2015-10-07 19:27 -0400
                Re: green stars "Brian M. Scott" <b.scott@csuohio.edu> - 2015-10-07 19:43 -0400
                Re: green stars Greg Goss <gossg@gossg.org> - 2015-10-08 01:58 -0600
                Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-08 01:11 -0700
                Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-08 13:49 -0700
                Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-08 21:20 -0700
                Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-09 22:04 -0700
                Re: green stars wdstarr@panix.com (William December Starr) - 2015-10-08 08:19 -0400
                Re: green stars pnalsing@gmail.com - 2015-10-08 08:59 -0700
                Re: green stars Greg Goss <gossg@gossg.org> - 2015-10-09 00:10 -0600
                Re: green stars William Vetter <mdhangton@gmail.com> - 2015-10-09 13:19 -0400
                Re: green stars wdstarr@panix.com (William December Starr) - 2015-10-09 21:27 -0400
                Re: green stars Greg Goss <gossg@gossg.org> - 2015-10-10 20:12 -0600
                Re: green stars Lofty Goat <rlwatkins@gmail.com> - 2015-10-05 19:08 -0500
                Re: green stars Dimensional Traveler <dtravel@sonic.net> - 2015-10-05 17:20 -0700
                Re: green stars djheydt@kithrup.com (Dorothy J Heydt) - 2015-10-06 01:09 +0000
                Re: green stars "J. Clarke" <j.clarke.873638@gmail.com> - 2015-10-05 22:21 -0400
                Re: green stars djheydt@kithrup.com (Dorothy J Heydt) - 2015-10-06 02:33 +0000
                Re: green stars "J. Clarke" <j.clarke.873638@gmail.com> - 2015-10-05 23:03 -0400
                Re: green stars Dimensional Traveler <dtravel@sonic.net> - 2015-10-05 22:03 -0700
                Re: green stars Wayne Brown <fwbrown@bellsouth.net> - 2015-10-08 19:38 +0000
                Re: green stars djheydt@kithrup.com (Dorothy J Heydt) - 2015-10-08 22:19 +0000
                Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-08 16:14 -0700
                Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-08 16:16 -0700
                Re: green stars pnalsing@gmail.com - 2015-10-08 17:33 -0700
                Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-08 19:33 -0700
                Re: green stars pnalsing@gmail.com - 2015-10-08 19:59 -0700
                Re: green stars "J. Clarke" <j.clarke.873638@gmail.com> - 2015-10-08 21:36 -0400
                Re: green stars djheydt@kithrup.com (Dorothy J Heydt) - 2015-10-09 04:19 +0000
                Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-09 11:12 -0700
                Re: green stars scott@slp53.sl.home (Scott Lurndal) - 2015-10-09 14:05 +0000
                Re: green stars "J. Clarke" <j.clarke.873638@gmail.com> - 2015-10-08 18:57 -0400
                Re: green stars jmfbahciv <See.above@aol.com> - 2015-10-06 13:34 +0000
                Re: green stars Gutless Umbrella Carrying Sissy <taustinca@gmail.com> - 2015-10-04 10:57 -0700
              Re: green stars "Brian M. Scott" <b.scott@csuohio.edu> - 2015-10-04 10:41 -0400
                Re: green stars wdstarr@panix.com (William December Starr) - 2015-10-04 13:43 -0400
      Re: green stars wdstarr@panix.com (William December Starr) - 2015-10-02 22:38 -0400
      Re: green stars Yousuf Khan <bbbl67@spammenot.yahoo.com> - 2015-10-03 17:37 -0400
        Re: green stars Gutless Umbrella Carrying Sissy <taustinca@gmail.com> - 2015-10-03 14:52 -0700
        Re: green stars Sam Wormley <swormley1@gmail.com> - 2015-10-03 17:36 -0500
          Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-05 01:39 -0700
            Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-05 01:55 -0700
        Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-05 01:17 -0700
          Re: green stars Yousuf Khan <bbbl67@spammenot.yahoo.com> - 2015-10-05 14:04 -0400
            Re: green stars Sam Wormley <swormley1@gmail.com> - 2015-10-05 13:07 -0500
            Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-05 12:58 -0700
              Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-05 23:52 -0700
                Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-06 10:24 -0700
                Re: green stars pnalsing@gmail.com - 2015-10-06 11:39 -0700
                Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-06 12:35 -0700
                Re: green stars pnalsing@gmail.com - 2015-10-06 13:20 -0700
                Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-06 15:15 -0700
                Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-06 15:31 -0700
                Re: green stars pnalsing@gmail.com - 2015-10-06 15:58 -0700
                Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-06 23:12 -0700
                Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-06 23:34 -0700
                Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-07 00:49 -0700
                Re: green stars The Starmaker <starmaker@ix.netcom.com> - 2015-10-08 21:24 -0700
  Re: green stars "reber g=emc^2" <herbertglazier0@gmail.com> - 2015-10-02 13:26 -0700
    Re: green stars "reber g=emc^2" <herbertglazier0@gmail.com> - 2015-10-06 09:58 -0700
  Re: green stars Sam Wormley <swormley1@gmail.com> - 2015-10-04 07:53 -0500

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