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Stars/Reds/Quiz

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Red stars is a stand-alone radiation astronomy lecture studying astronomical radiating sources, or natural radiating sources called red stars.

This is a real visual image of the red giant Mira by the Hubble Space Telescope. Credit: Margarita Karovska (Harvard-Smithsonian Center for Astrophysics) and NASA.

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Quiz

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1 A recurrent nova is produced by a white dwarf star and a red giant circling about each other in a close?

2 Red-giant stars have (or theoretically may have) these in common:

potential 22Ne
helium-burning shells
non-standard neutrino losses
Lithium red line
N stars display F abundances up to 30 times the solar system value
RGB and AGB stars
a radius between 200 and 800 times that of the Sun

3 True or False, In 1866, after the new observatory had been completed, Schjellerup assembled a catalog of red stars.

TRUE
FALSE

4 Which of the following are associated with Type-Ia supernovae as a standard candle?

lack silicon lines
lack hydrogen lines
lack helium lines
lack lithium lines
expanding photosphere method
almost as luminous as the brightest red supergiants

5 True or False, Of some 824 red giant stars, lithium is detected in several stars.

TRUE
FALSE

6 Which of the following are associated with red clump stars as a standard candle?

many examples within reach of parallax measurements
internal extinction
star forming regions
sufficiently bright
local group galaxies
almost as luminous as the brightest red supergiants

7 Yes or No, In some 824 red giant stars, the Li I 670.78 nm line was detected in several stars, but only five objects presented a strong line.

Yes
No

8 Complete the text:

Match up the letter for the object name with the radio or radar image below:
Sun - A
Mercury - B
Venus - C
Earth - D
Moon (South Pole) - E
Moon (North Pole) - F
Moon (850 micron thermal emission) - G
Mars (North Pole cross section) - H
Toustatis - I
Jupiter - J
Saturn - K
Titan - L
Interstellar medium - M
Milky Way - N
3C 98 - O
3C 31 - P
3C 380 - Q
Moon (self radiation) - R
NGC 4151 - S
GRS 1915 - T
M87 - U
3C 279 - V
IRC+10216 - W
Boomerang nebula - X
R Sculptoris - Y
 

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File:3C 380 bent.jpg

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File:Bhexplode merlin big.gif

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File:Allsky408.jpg

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File:Nhsc2010-011a.jpg

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File:Moon 4panels2 col.jpg

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File:M87 jet Hubble.gif

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File:Sun5GHz.jpg

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File:3c279 mosaic lo.jpg

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File:Ngc4151stis.gif

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File:Jupiter radio image.jpg

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File:Moon at 850 microns.gif

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File:HIsky.jpg
 
 

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9 True or False, Sirius is a likely first red source in Canis Major.

TRUE
FALSE

10 Which of the following are associated with planetary nebula as a standard candle?

observations made through a narrow band 5007 filter
internal extinction
star forming regions
relatively dust-free environments
found in galaxies of all Hubble types
almost as luminous as the brightest red supergiants

11 Supernovae of Type Ia lack hydrogen lines and helium lines in their optical spectra; during the first month after maximum light they do have a strong absorption feature produced by the red doublet (λ6347, λ6371 Å) of singly ionized?

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12 The extent of the Hα absorption trough along the major axes of quenched spirals is what?

more truncated than the distribution of the Hα emission line for H I deficient galaxies
contributed to by the new stellar population
less truncated than the distribution of the Hα emission line for H I deficient galaxies
due to the quenching
disks building up from the outside in

13 Complete the text:

Match up the radiation letter with each of the detector possibilities below:
Visual rays - M
Violet rays - N
Blue rays - O
Cyan rays - P
Green rays - Q
Yellow rays - R
Orange rays - S
Red rays - T
F547M

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F675W

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broad-band filter centered at 404 nm

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F588N

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thallium bromide (TlBr) crystals

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F606W

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18 micrometers FWHM at 490 nm

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

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14 Complete the text:

Match up the letter of the spherical object with each of the possibilities below:
Sun - A
Mercury - B
Venus - C
Earth - D
Moon - E
Mars - F
Ceres - G
Jupiter - H
Callisto - I
Europa - J
Ganymede - K
Io - L
Enceladus - M
Titan - N
Uranus - O
Titania - P
Neptune - Q
Triton - R
Pluto - S
 

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

violet
blue
cyan
green
yellow
orange
red

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

violet
blue
cyan
green
yellow
orange
red

17 Complete the text:

The color of a star, as determined by the peak frequency of the visible light, depends on the temperature of the star's outer layers, including its

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18 Which of the following are characteristic of high-velocity stars?

moving faster than 65 km/s
closer stars more affected
may point away from a stellar association
comet-like appearance
red shift
blue shift


Hypotheses

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Main resource: Hypotheses
  1. Nebulas are composed of red dust and rock.

See also

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{{Radiation astronomy resources}}

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