Portal de Periódicos da CAPES

The galactic cluster M67 and its significance for stellar evolution

1955; IOP Publishing; Volume: 121; Linguagem: Inglês

10.1086/146027

1538-4357

H. L. Johnson, Allan Sandage,

History and Developments in Astronomy

view Abstract Citations (177) References (22) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The galactic cluster M 67 and its significance for stellar evolution. Johnson, H. L. ; Sandage, A. R. Abstract Colors and magnitudes on the U, B, V system have been determined for nearly 500 stars in the galactic cluster M67. The color-magnitude diagram is unlike that of any other galactic cluster known. The apparent modulus is m - M = 9.70 + 0.1, as determined by a fit of the main sequence to the C-M diagram of the near-by stars. M67 may be the oldest galactic cluster known. Its age is approximately 5 X 10 years. Comparison of the M67 diagram with the globular clusters M3 and M92 suggests the effect that chemical composition may have upon the paths of evolution for individual stars in the C-M diagram. Comparison of the M67 diagram with other galactic clusters illustrates the effect that mass differences may have on the tracks of evolution. A prediction is made, on the basis of the general trend of C-M diagrams for galactic clusters, that giant stars in the general field at M,, 0.0 near K0 may have a range of mass from about 1.2 to 3.0 o. Data from the M67 diagram, together with evidence for a lack of subgiants of luminosity class lv later than K2, suggests that there were no stars in existence near the solar neighborhood more than about 5 X 10 years ago. Publication: The Astrophysical Journal Pub Date: May 1955 DOI: 10.1086/146027 Bibcode: 1955ApJ...121..616J full text sources ADS | data products SIMBAD (62) GCPD (1)