Red giants and their descendants—new light on old stars
نویسندگان
چکیده
منابع مشابه
The Link between Symbiotic Stars and Chemically-peculiar Red Giants
Barium stars and technetium-poor, extrinsic S stars are binary systems with a white dwarf companion, and with orbital elements similar to those of symbiotic systems. One may thus wonder whether these various families of binary systems involving red giant stars are somehow related. This question is actually twofold: (i) Do barium and binary S stars exhibit some symbiotic activity? (ii) Do symbio...
متن کاملVariable Red Giants in the LMC: Pulsating Stars and Binaries?
Infrared J and K photometry has been obtained of all red giants in the half square degree region of the LMC bar searched for variables using the MACHO database by Wood et al. (1999). The K–logP diagram shows the five distinct period–luminosity sequences which are also evident in the MACHO photometry. The K–logP plot allows identification of the Mira sequence from among the five observed sequenc...
متن کاملWhy Do Low-Mass Stars Become Red Giants?
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 dis...
متن کاملThe effect of turbulent pressure on the red giants and AGB stars
The expressions for the turbulent pressure, equation of state and thermodynamic quantities taking account of turbulent pressure are derived in the framework of the mixing-length theory of convection. The numerical computations indicate that the turbulent pressure in the region close to the surface of a red giant or anAGB star can reach a value of 30-40 percent of the total pressure. A compariso...
متن کاملMass-loss from Red Giants
Although much is known about the nature of winds from hot stars and giants and supergiants with spectral types earlier than K, there is still much to be learned regarding the mass-loss process in cool, late-type stars. We will review the current state of research, with particular reference to observations and modelling of mass-loss from giant stars in symbiotic systems.
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ژورنال
عنوان ژورنال: Nature
سال: 1981
ISSN: 0028-0836,1476-4687
DOI: 10.1038/293513a0