Search results
Results from the WOW.Com Content Network
Yellow supergiants generally have spectral types of F and G, although sometimes late A or early K stars are included. [1] [2] [3] These spectral types are characterised by hydrogen lines that are very strong in class A, weakening through F and G until they are very weak or absent in class K. Calcium H and K lines are present in late A spectra, but stronger in class F, and strongest in class G ...
Intrinsic variable types in the Hertzsprung–Russell diagram showing the Yellow Hypergiants above (i.e. more luminous than) the Cepheid instability strip. A yellow hypergiant (YHG) is a massive star with an extended atmosphere, a spectral class from A to K, and, starting with an initial mass of about 20–60 solar masses, has lost as much as half that mass.
This is a list of the nearest supergiant stars to Earth, located at a distance of up to 1,100 light-years (340 parsecs) from Earth. Some of the brightest stars in the night sky, such as Rigel and Antares, are in the list.
The yellow hypergiants are thought to be generally post-red supergiant stars that have already lost most of their atmospheres and hydrogen. A few more stable high mass yellow supergiants with approximately the same luminosity are known and thought to be evolving towards the red supergiant phase, but these are rare as this is expected to be a ...
Brittany Flores speaks to first grade son Rey Flores Jr. about his science fair project at Miller High School on Friday, Jan. 19, 2024, in Corpus Christi, Texas.
O class main sequence stars are already highly luminous. The giant phase for such stars is a brief phase of slightly increased size and luminosity before developing a supergiant spectral luminosity class. Type O giants may be more than a hundred thousand times as luminous as the sun, brighter than many supergiants.
A yellow supergiant. HD 268757 979 [115] Large Magellanic Cloud L/T eff: A G8 yellow hypergiant. SMC 56389 976 [107] Small Magellanic Cloud L/T eff: LMC 136404 974 [107] Large Magellanic Cloud L/T eff: SP77 46-32 973 [107] –1,133 [109] Large Magellanic Cloud HV 2084 967 [107] –1,083 [109] Small Magellanic Cloud WOH S74 965 [107] –1,014 ...
One astrophysical method used to definitively identify yellow hypergiants is the so-called Keenan-Smolinski criterion. Here all absorption lines should be strongly broadened, beyond those expected of bright supergiant stars, and also show strong evidence of significant mass loss.