-BPL

Naos has the Bayer or Greek letter designation of Zeta Puppis & is an O type supergiant; the brightest star in Puppis - roughly in a line from the tail stars of Canis Major shines at 2.3 mag in our skies though actually very much more luminous - esp. at UV wavelengths!

So O type dwarfs are .. well extremely, *extremely*, rare. Only other ones I’m really aware of, Alnitak or Zeta Orionis & Mintaka or Delta Orionis although both these “Belt stars “of Orion -bottom of the “Saucepan” asterism for us southerners - are supergiants and, at O9.5 Ia class, only barely fall into that spectral type as the coolest of O class stars.

Incidentally, the other “Belt star” - the middle one Alnilam or Epsilon Ori is a B0 supergiant so nearly the same class .. Then we have Gamma-2 Velorum or Regor is also an O type star -an O7 giant & is accompanied by a Wolf-Rayet star although pretty sure its southern circumpolar. Northern circumpolar though, I think, pretty faint is Alpha Camelopardalis another O type star not sure if its a dwarf or giant but think iRecallseeing its got a “bow-shock” nebula around it.

Finally we have perhaps the brightest star in our Galaxy HD 93129A an O3 type supergiant located in the Carinae nebula’s Trumpler 14 starcluster. HD 93129 A is visually mag. 7.3 but has a total bolometric (all radiation wavelengths included.) absolute Magnitude (real brightness) of - 11.2! This means if you were 30 odd light years away from this star it would be about as bright as the full Moon!

Pretty sure Kaler’s star-of-the-week website - you can access that via the Procyon link I posted before - has entries on those stars if y’all wish to know more …

Sources : Kaler, James B., ‘The 100 GreatestStars’, Copernicus Books, 2002.
& ‘Collins Guide to Stars & Planets’, Ridpath, Ian & Tirion, Wil, Collins, 1988.

Not sure about SINBAD … or how they / it (?) classifies Procyon A …

I know Ken Croswell has one article online :

http://kencroswell.com/AgeOfProcyon.html

(hope the link works!)

discussing Procyon’s age - he says its 1.7 billion years old, 1/3rd the Sun’s age & is, quote:

“… evolving from the main sequence to the subgiant stage.”

Unquote.

James B. kaler also describes Procyon online via :

http://www.astro.uiuc.edu/~kaler/sow/procyon.html

(again, hope the link works) where he writes :

” … (true to the stars’ subgiant status) that it is about to give up core hydrogen fusion as it prepares to become a much cooler and brighter subgiant (the stars age around three billion years).”

From site linked above; brackets original, any typos mine.

So a bit of a disparity and unclarity there regarding the age figure but … still hope that helps!

It’s all in the visible spectrum, but it’s not true color. The Gemini website says that the red = H-alpha, blue = OIII, and green = SII. H-alpha really is a deep red, but SII is actually an even darker red. OIII is a pretty blueish-green. So, the blue needs to be greener, and all the yellow parts are actually dark red. The only parts of this you might be able to see, even if you were close, are the OIII sections shown in blue. (The color would probably be washed out all the way to gray though.) Your eye is not at all sensitive to red light, especially when it’s faint. Supernova remnants are especially faint, so the red parts are pretty much invisible. (If you were to get closer, it would appear larger and more spread out, so that wouldn’t help.) There are other emission lines in this nebula than what are shown here, of course, but the rest are probably fainter and even less helpful to you in the unaided-eye department.

My typo in the above …

So I guess make that Achernarese after Achernar, (Alpha Eridani) the brightest normal blue dwarf star, a B5 star located 145 light years away for B type stars. (Achernar is sometimes described as a giant but pretty sure its actually still on the main-sequence & wrongly listed as 85 ly off in older sources.)

High mass for classes O & B (O stars ‘Naoisian’ after Naods the brightest example?)

Siran and Procyonese for types A and F dwarfs respectively then Sun-like applying for stars from about spectral type F6 (Procyon at type F5 is already seven times brighter and twice as large diameter-wise than our Sun) through to about K5 and fianlly redwrafs for stars fainetr than that …

Maybe?