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RR Lyrae variable stars can be found in the left of this gap on a section of the diagram called the instability strip. Cepheid variables also fall on the instability strip, at higher luminosities. The H-R diagram can be used by scientists to roughly measure how far away a star cluster or galaxy is from Earth. This can be done by comparing the ...
Scutum Star Cloud with open cluster Messier 11 at lower left. Technically not star clusters, star clouds are large groups of many stars within a galaxy, spread over very many light-years of space. Often they contain star clusters within them. The stars appear closely packed, but are not usually part of any structure. [17]
The total mass contained in the cluster is estimated to be approximately 800 solar masses and is dominated by fainter and redder stars [clarification needed]. [67] An estimate of the frequency of binary stars in the Pleiades is approximately 57%. [68] The cluster contains many brown dwarfs, such as Teide 1.
The horizontal branch (HB) is a stage of stellar evolution that immediately follows the red-giant branch in stars whose masses are similar to the Sun's. Horizontal-branch stars are powered by helium fusion in the core (via the triple-alpha process) and by hydrogen fusion (via the CNO cycle) in a shell surrounding the core.
One of the first uses of an isochrone method to date an open cluster was by Demarque and Larson in 1963. [3] If the initial mass function of the open cluster is known, isochrones can be calculated at any age by taking every star in the initial population, using numerical simulations to evolve it forwards to the desired age, and plotting the ...
Image taken by ESO's VISTA of the Globular Cluster VVV CL001. On the right lies the globular star cluster UKS 1 and on the left [where?] lies a much less conspicuous new discovery, VVV CL001. [1] The two are not physically located close to each other; this is a line-of-sight coincidence. [2] This is a list of globular clusters.
A simple chart for classifying the main star types using Harvard classification In astronomy , stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the rainbow of colors ...
Globular cluster: Nearest globular cluster to the Earth. Also the first globular cluster known to have exoplanets (PSR B1620-26b) Messier 12: 74.4 [28] Messier 70: 68 [29] NGC 290: 66 [30] Open cluster: Messier 28: 60 [31] Globular cluster: Messier 18: 52.4 [32] Open cluster: The following notable star clusters are listed for the purpose of ...