| 摘要(英) |
We study the dynamics of a binary system under different mass loss scenarios. We
are particularly interested in the conditions under which the system remains bound
or not when the mass loss process is stopped. We study two cases. The first one is
the binary system is an isolated system and one of the stars change its mass for a
finite time. The second one is the binary system is embedded in molecular cloud (or
cloud core) and the cloud (or cloud core) is dispersing or losing mass.
For the isolated binary system, we consider three different systems. (1) The host
star is much heavier than the companion star, and we study mass loss by (a) host
star (b) companion star. (2) Both stars has similar mass, and mass loss by one star
(3) the total mass is unchanged, mass transfer from one star to the other. Most of
them have similar results. For example, the system is more likely to be unbound
if the mass loss is large. Also there is a general trend that for a fix mass loss, the
longer is the time interval of mass loss, the more likely is the system remains bound.
However, this trend is not necessary monotonic. It may happen that the system may
alternate between bound and unbound destiny when the time interval of mass loss
increases within a certain range.
For embedded the binary system, we propose two models for cloud dispersion. We
find that the binary system is more likely to be unbound if the initial position is
larger, or initial velocity is faster, or the mass of cloud is larger. The dependence of
dispersion time is complicated. When the density of interstellar medium is small, the
time of dispersion has a great impact on system. When the density of interstellar
medium is large, the increase in dispersion time may cause the system to alternate
between bound and unbound destiny |
| 參考文獻 |
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arXiv preprint arXiv:1804.11163 . |
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