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Characteristics of Identified Extragalactic Radio Sources
1963
Astronomical Journal
Preserved Fulltext
The discrepancy may be due to errors in observational data or it may be due to molecular opacity sources such as ÍJ2not included in the calculation. The evolutionary tracks for completely convective contraction are nearly vertical in the theoretical H-R diagram. The times required to reach the main sequence are 1.5 XlO 8 and 3.5 X10 8 yr, for masses 0.4 and 0.1, respectively.
doi:10.1086/109080
fatcat:ehpnh2ld3fdt5l6zdihfxdzfkm