The variability of BD +50 961 (SY Persei, an orange star) is confirmed.
"ESO Photo Ambassador Babak Tafreshi snapped this remarkable image [at left] of the antennas of the Atacama Large Millimeter/submillimeter Array (ALMA), set against the splendour of the Milky Way. The richness of the sky in this picture attests to the unsurpassed conditions for astronomy on the 5000-metre-high Chajnantor plateau in Chile’s Atacama region."
"This view shows the constellations of Carina (The Keel) and Vela (The Sails). The dark, wispy dust clouds of the Milky Way streak from middle top left to middle bottom right. The bright orange star in the upper left is Suhail in Vela, while the similarly orange star in the upper middle is Avior, in Carina. Of the three bright blue stars that form an “L” near these stars, the left two belong to Vela, and the right one to Carina. And exactly in the centre of the image below these stars gleams the pink glow of the Carina Nebula"
In the photograph at right, the orange super giant star Betelgeuse is shown in relationship with the dense nebulas of the Orion Molecular Cloud Complex and Orion's Belt.
Eta Pavonis on the lower right is an example of a super giant orange star. It is specifically spectral type K2II according to SIMBAD.
Arcturus (α Boötis) is an orange (K1.5III) giant per SIMBAD.
According to SIMBAD HD 152334, or Zeta2 Scorpii is a spectral type K4III star. In the image at right, it is the orange star on the left. It is a single star. Its actual color has less red in it as does that of zeta1 Scorpii, the blue giant on the right. The image on SIMBAD by AladinLite is from DSS2. It has the correct colors.
"Stars come in all different colors. The color of a star indicates its surface temperature, an important property used to assign each star a spectral type. Most stars in the above Sagittarius Star Cloud are orange or red and relatively faint, as our Sun would appear. The blue and greenish stars are hotter, many being relatively young and massive. The bright red stars are cool Red Giants, bloated stars once similar to our Sun that have entered a more advanced stage of evolution. Stars of this Sagittarius Cloud lie towards the center of our Galaxy - tantalizing cosmic jewels viewed through a rift in the dark, pervasive, interstellar dust. This famous stellar grouping houses some of the oldest stars known."
- T. W. Backhouse (July 1899). "Confirmed or New Variable Stars". The Observatory 22 (281): 275-6. http://adsabs.harvard.edu//abs/1899Obs....22..276. Retrieved 2012-02-01.
- Babak Tafreshi (May 28, 2012). "The Southern Milky Way Above ALMA". Chajnantor plateau in Chile’s Atacama region. Retrieved 2014-03-01.
- Robert Nemiroff & Jerry Bonnell (May 20, 2001). "Sagittarius Star Cloud". Washington, DC USA: NASA. Retrieved 2014-03-02.
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