Kumar 1963

Kumar, S.S., 1963: The Helmholtz-Kelvin time scale for stars of very low mass. Astrophys. J., 137, 1126-1128.

Assuming that the contracting stars in convective equilibrium evolve vertically downward in the H-R diagram, a simple expression for the Helmholtz-Kelvin time scale t_HK is derived. Application of this expression to stars of mass M %lt; 0.lM_☉ shows that these stars contract to a radius of about 0.lR_☉ in a time scale of approximately 1 billion years, while the earlier estimates, based on horizontal evolution, gave a time scale t_HK greater than a hundred billion years.

• Download PDF (Document is 347 kB; scanned; no OCR)
• PDF documents require a special viewer such as the free Adobe Reader.

Citation Styles

Show: ACP, AGU, AMS, ApJ, JQSRT, Science style

Kumar, S.S.: The Helmholtz-Kelvin time scale for stars of very low mass, Astrophys. J., 137, 1126-1128, 1963.

Kumar, S.S. (1963), The Helmholtz-Kelvin time scale for stars of very low mass, Astrophys. J., 137, 1126-1128.

Kumar, S.S., 1963: The Helmholtz-Kelvin time scale for stars of very low mass. Astrophys. J., 137, 1126-1128.

Kumar, S.S. 1963, Astrophys. J., 137, 1126.

Kumar SS. The Helmholtz-Kelvin time scale for stars of very low mass, Astrophys J 1963;137:1126-1128.

S.S. Kumar, Astrophys. J. 137, 1126-1128 (1963).