Stars/Violets/Quiz

File:280557main oblate purplesun HI.jpg

This is a violet astronomy image of the Sun. Credit: NASA.

Violet stars is a lecture and an article about the astronomy of stars.

You are free to take this quiz based on violet stars at any time.

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Quiz

Point added for a correct answer:
Points for an incorrect answer:
Ignore the questions' coefficients:

1 True or False, Regulus is a likely first violet source in Leo.

	TRUE
	FALSE

2 Complete the text:

Match up the violet or violet containing image with the object letter:

Sun - A

Venus - B

Earth - C

Moon - D

Mars - E

Jupiter - F

Ganymede - G

Io - H

Saturn - I

Dione - J

Titan - K

Uranus - L

Ariel - M

Miranda - N

Triton - O

Eta Carinae - P

NGC 5584 - Q

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File:Blueberrysun friedman 1296.jpg .

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3 True or False, α Sagittarii may be the first detected UV source in the constellation Sagittarius.

	TRUE
	FALSE

4 Yes or No, The “Purple Haze” is a diffuse blueish/purple glow within a few arcseconds of the central star in HST images of the Homunculus.

	Yes
	No

5 True or False, Violet stars have radiation that peaks over the wavelength band 380-450 nm.

	TRUE
	FALSE

6 Which of the following are phenomena associated with violet stars?

	photographs of the planet Venus taken in 1927
	the purple haze within a few arcseconds of the central star of the Homunculus
	the faintness of carbon stars
	the stellar abundance of aluminum
	adaptive optics
	the helium beta line

7 Helium has emission lines in which of the following colors?

	violet
	blue
	cyan
	green
	yellow
	orange
	red

8 Hydrogen has emission lines in which of the following colors?

	violet
	blue
	cyan
	green
	yellow
	orange
	red

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

	Yes
	No

10 Complete the text:

Match up the radiation letter with each of the detector possibilities below:

Optical rays - L

Visual rays - M

Violet rays - N

Blue rays - O

Cyan rays - P

Green rays - Q

Yellow rays - R

Orange rays - S

Red rays - T

multialkali (Na-K-Sb-Cs) photocathode materials .

F547M .

F675W .

broad-band filter centered at 404 nm .

F588N .

thallium bromide (TlBr) crystals .

F606W .

18 micrometers FWHM at 490 nm .

wide-gap II-VI semiconductor ZnO doped with Co2+ (Zn1-xCoxO) .

Hypotheses

Main resource: Hypotheses

1. The current metallicity of a star may depend on the presence of coronal clouds.

See also

• Green astronomy/Quiz
• Planetary science/Quiz
• Radiation astrochemistry/Quiz
• Radiation astrogeography/Quiz
• Radiation astrohistory/Quiz
• Radiation astronomy/Quiz
• Theoretical radiation astronomy/Quiz

External links

• International Astronomical Union
• NASA/IPAC Extragalactic Database - NED
• NASA's National Space Science Data Center
• The SAO/NASA Astrophysics Data System
• SDSS Quick Look tool: SkyServer
• SIMBAD Astronomical Database
• SIMBAD Web interface, Harvard alternate
• Spacecraft Query at NASA.
• Universal coordinate converter

{{Stars resources}}