Question

1. the star algol is estimated to have approximately the same luminosity as the star aldebaran and approximately the same temperature as the star rigel. algol is best classified as a a. main sequence star b. red giant star c. white dwarf star d. red dwarf star 10. which list shows stars in order of increasing temperature? a. barnard’s star, polaris, sirius, rigel b. aldebaran, the sun, rigel, procyon b c. rigel, polaris, aldebaran, barnard’s star d. procyon b, alpha centauri, polaris, betelgeuse 11. compared with our sun, the star betelgeuse is a. smaller, hotter, and less luminous b. smaller, cooler, and more luminous c. larger, hotter, and less luminous d. larger, cooler, and more luminous 12. compared to other groups of stars, the group that has relatively low luminosities and relatively low temperatures is the a. red dwarfs b. white dwarfs c. red giants d. blue supergiants 13. compared to the surface temperature and luminosity of massive stars in the main sequence, smaller stars in the main sequence are a. hotter and less luminous b. hotter and more luminous c. cooler and less luminous d. cooler and more luminous

Explanation:

9.

Algod tiene la misma luminosidad que Aldebaran y la misma temperatura que Rigel. Rigel es una estrella de la secuencia principal.

Las estrellas más frías son las enanas rojas y las más calientes son las supergigantes azules. Barnard's Star es una enana roja, Polaris es una gigante amarilla, Sirius es una estrella azul - blanca y Rigel es una supergigante azul.

Betelgeuse es una supergigante roja. Es más grande, más fría y más luminosa que el Sol.

Answer:

a. Main - sequence star

10.