APAO 2015, Практически тур, Групи α и β — Задача 8
XI Asian-Pacific Astronomy Olympiad — Practical round · 13 ноември 2015 г.
Внимание: Бележка към темата
The referenced data sheets containing YY Gem radial velocities and exoplanet masses and surface gravities are missing from the archived practical paper and the available companion files. The questions are reproduced here, but their numerical tasks require those missing data.
Условие
The binary star YY Gem is also known as Castor Ca & Castor Cb. It is known from preliminary observations that the period of this binary star is more than 8 hours but less than 12 hours. O. Struve & V. Zebergs (1959, ApJ, 130, 783) measured radial velocities of the two components and get the results presented at the enclosed “sheet of data”.
Velocities are given in km/s and time given is UT in the table.
8.1. Plot graph of the velocities of components vs time.
8.2. (α) Find exact orbital period of the components.
8.2. (β) Find exact orbital period, orbital radius and masses of the two components.
Решение
Внимание: Непълно решение
В архива няма официално решение на тази задача.
Теми и трудност
Оценена трудност: 4/5.
Звезди · Небесна механика · Двойни звезди · Орбитално движение
Предпоставки: Разширена олимпиадна подготовка
Оригинал в Архива: pract.pdf