We examine the longitudinal distribution of the stars escaping from a cluster along tidal tails. Using both theory and simulations, we show that, even in the case of a star cluster in a circular galactic orbit, when the tide is steady, the distribution exhibits maxima at a distance of many tidal radii from the cluster.Comment: 6 pages, 4 figures, accepted for publication in MNRA

National authorities that seek to protect plant and animal health and welfare follow international agreements and guidelines designed to inhibit the introduction and spread of pests and diseases harmful to animals and plants by conducting formal risk analyses. Analyses are generally initiated by: (i) new information about a pest or disease; (ii) discovery of a pathway for pest or disease introduction (e.g. through pre-border, border and post-border biosecurity surveillance); or (iii) review of a relevant pest or disease management policy. Quantitative and qualitative techniques are used in risk analyses whose conclusions can form the basis of sanitary and phytosanitary regulations and inform biosecurity surveillance strategies generating data that helps narrow uncertainties within risk analyses.

We examine the longitudinal distribution of the stars escaping from a cluster along tidal tails. Using both theory and simulations, we show that, even in the case of a star cluster in a circular galactic orbit, when the tide is steady, the distribution exhibits maxima at a distance of many tidal radii from the cluster.

No abstract

Individuals can differ in how much they have a tendency to think about the future, as opposed to the present or the past. Findings from many different areas of prospection point to the value of being future-minded, and its value is inherent in how well-being is sometimes defined (e.g. having goals and a sense of purpose). On the other hand, mindfulness, which has become prominent in ideas about well-being and treatment of mental health difficulties, appears to point to the value of a present focus. Chapter 9 reviews evidence related to both of these questions, critically evaluating evidence on the relationship of well-being to self-report measures of both mindfulness and future orientation. A distinction is also made between the temporal present and the experienced present, which helps to resolve the apparent contradiction between being mindful and thinking about the future.