Why do low-mass stars become red giants?

Details Why do low-mass stars become red giants? Why do low-mass stars become red giants?

2009-02-02

arxiv.org/abs/0902.0406v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

7 pages, 9 figures. Accepted for publication in PASA

Scientific paper

We revisit the problem of why stars become red giants. We modify the physics of a standard stellar evolution code in order to determine what does and what does not contribute to a star becoming a red giant. In particular, we have run tests to try to separate the effects of changes in the mean molecular weight and in the energy generation. The implications for why stars become red giants are discussed. We find that while a change in the mean molecular weight is necessary (but not sufficient) for a 1 solar mass star to become a red giant, this is not the case in a star of 5 solar masses. It therefore seems that there may be more than one way to make a giant.

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