USAAAO 2015, Пробен кръг — Задача 17

USAAAO Practice Round 2015

Бележка

This round consists of 20 multiple-choice problems to be completed in 50 minutes. You may only use a scientific calculator and a table of constants during the test.

Условие

In a nearby star system, two stars are seen to orbit each other every 8 years. At their closest, the stars are 2" apart. At their furthest, they are 18" apart. If a parallax of 0.5" is observed for the star system, what is its combined mass in solar masses? Assume an inclination of 90 degrees.

a. 0.5

b. 1

c. 2

d. 4

e. 8

Отговори

Решение

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Оригинал в Архива: 2015-practice-round-exam.pdf · официални решения: 2015-practice-round-solutions.pdf