3 papers
astro-ph.SR2026
Upper Limits to Long-Term Variability of Solar-Type Stars from Observations of the Open Cluster M67
Steven R. Spangler
Variations in the luminosity of the Sun on timescales of thousands to millions of years could potentially be responsible for terrestrial climate variations in the Phanerozooic geol…
astro-ph.SR2025
The Effect of Photometric Errors on the Measured Width of the Main Sequence in Star Clusters
Steven R. Spangler
This paper deals with the effect of errors in the B and V magnitudes, or measurements in any other color system, on the width of the main sequence in a color-magnitude (Hertzsprung…
astro-ph.SR2025
Broadening of the Main Sequence of a Star Cluster by Undetected Binaries
Steven R. Spangler
This paper is concerned with the spread in apparent magnitudes (or absolute magnitudes) of main-sequence stars in a star cluster. I specifically consider the effect of binary stars…