Stars/Os/Quiz

From Wikiversity
< Stars‎ | Os
Jump to navigation Jump to search
HD 93129 is surrounded by the lesser stars of Trumpler 14 star cluster. Credit: NASA & ESA, Jesús Maíz Apellániz (Centro de Astrobiología, CSIC-INTA, Spain).

O stars is a lecture about an entity, source, and/or object observed using radiation astronomy that is classified as an O-type star.

You are free to take this quiz based on O stars. Once you've read and studied it, the links contained within, listed under See also, External links and the {{stars resources}} template, you should have adequate background to score 100 %.

Enjoy learning by doing!

Quiz[edit]







  

1

O stars can be put into classes based on?

luminosity
size
apparent mass
temperature
spectral lines
composition

2

Yes or No, Stellar class O stars have surface temperatures high enough that most of their luminescence is in the ultraviolet.

Yes
No

3

Which of the following is not a characteristic of O type stars?

can be a spectroscopic binary
the hottest stars
can be a high-velocity star
peak wavelength in the gamma-ray range
orange color.

4

True or False, Alnitak is a triple star system with an O9.7 supergiant and an O9 giant as well as a B0 giant.

TRUE
FALSE

5

True or False, Spectroscopically Zeta Puppis is classified as O4 I.

TRUE
FALSE

6

True or False, BI 253 is an O2V star in the Large Magellanic Cloud.

TRUE
FALSE

7

Gamma-ray stars have surface temperatures starting at 300,000,000 K (300 MK) corresponding to a peak wavelength of 0.010 nm (10 pm) for the beginning of super soft

sources.

8

True or False, X-ray stars have surface temperatures starting at 300,000 K corresponding to a peak wavelength of 10 nm for the beginning of super soft X-ray sources.

TRUE
FALSE

9

Which of the following is not a phenomenon usually associated with O-type SN progenitors?

a blue supergiant
an LBV
a red supergiant
an early W-R
a WN

10

Complete the text:

On the main sequence for spectral classes 06-06.5, 07, and 08 one finds strong

λ4686 absorption often accompanied by weak

λλ4634-4640-4642 emission.

11

True or False, In 1947, G. E. Kron proposed that starspots were the reason for periodic changes in brightness on blue dwarfs.

TRUE
FALSE


Hypotheses[edit]

  1. Stars that emit light do so because they are receiving electron irradiation.

See also[edit]

External links[edit]