Stars/Astronomy/Quiz

File:Blueberrysun friedman 1296.jpg

This is a blue astronomy image of the Sun. Credit: A. Friedman.

Stellar astronomy is a lecture about the astronomy of stars.

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Quiz

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1 Which of the following elements have or appear to have lines occurring in the spectra of Vega?

	hydrogen
	helium
	lithium
	beryllium
	boron
	carbon
	nitrogen
	oxygen
	fluorine
	neon

2 True or False, Molecular lines for H₂O in the spectra for Vega are likely from water vapor in the Earth's atmosphere or the accretion disk around Vega.

	TRUE
	FALSE

3 Which of the following is not a spectral class A star?

	Sirius A
	Vega
	Bellatrix
	Deneb
	Altair
	Fomalhaut

4 The heavier element lines that occur in the spectrum of Vega are

	lanthanum (La)
	calcium (Ca)
	uranium (U)
	titanium (Ti)
	silicon (Si)
	iron (Fe)

5 Which of the following are associated with classical Cepheids as a standard candle?

	characteristic mottling
	young, disk objects
	recent star formation
	incipient resolution
	pulsation phenomenon
	easy to recognize
	correction for absorption

6 True or False, RS Canum Venaticorum variables are close binary stars having active chromospheres which can cause large stellar spots.

	TRUE
	FALSE

7 Which of the following are the differences between a star and an astronomical yellow source?

	a star may emit predominantly green rays
	an astronomical yellow source is spherical
	a yellow star is an astronomical yellow source
	a star with nuclear fusion in its chromosphere emits neutrinos, but a yellow source with no nuclear fusion ongoing does not
	a yellow source may be cloud like
	an astronomical yellow source may be a rocky object

8 Complete the text:

Match up the likely type of star fission with each of the possibilities below:

a triple-component stellar multiple - A

massive star fission - B

semidetached binary - C

a separating close contact binary - D

ZAMS system - E

tight, circular orbit, impossible to tell eclipses - F

lobate star - G

coronal mass ejection - H

BH Centauri .

Plaskett's Star (HR 2422) .

Betelgeuse

W Ursae Majoris .

Beta Lyrae .

V1010 Ophiuchi

object is confirmed to be co-moving .

Sun .

9 Which of the following is a technetium star?

	Alpha Camelopardalis
	R Geminorum
	TT CVn
	S Camelopardalis
	HR 107
	HR 774

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

	TRUE
	FALSE

11 Which of the following are X-radiation astronomy phenomena associated with stellar surface fusion?

	luminosities below ~3 x 1038 erg/s
	a few SSS with luminosities ≥1039 erg/s
	synchrotron radiation
	a photosphere
	a polar diameter that exceeds ever so slightly the equatorial diameter at solar cycle minimum
	super soft X-rays
	hot active regions with temperatures hot enough to fuse hydrogen
	sunspots at the feet of coronal loops

12 Main sequence variable stars of late spectral types, usually K or M, exhibiting variations in luminosity due to rotation, starspots and other chromospheric activity are called.

13 Which of the following is not a spectral class F star?

	Polaris
	Alrakis
	Bellatrix
	Procyon
	Canopus
	Wezen

14 True or False, To date, all of the reported hypervelocity stars (HVSs), which are believed to be ejected from the Galactic center, are blue.

	TRUE
	FALSE

15 Which of the following is a spectral class C or carbon star?

	Alpha Camelopardalis
	R Leporis
	TT CVn
	S Camelopardalis
	Pistol Star
	Y Canum Venaticorum

16 The type star that goes through fairly extreme changes of brightness: for instance, in 1952, its brightness increased by 75 times in only 20 seconds, is what star?

17 Which of the following is not a spectral class O star?

	Alpha Camelopardalis
	Tau Canis Majoris
	Plaskett's star
	Sirius A
	Pistol Star
	Zeta Puppis

18 Complete the text:

Match up the stellar image with the radiation astronomy:

meteor astronomy - A

neutrino astronomy - B

gamma-ray astronomy - C

X-ray astronomy - D

ultraviolet astronomy - E

visual astronomy - F

violet astronomy - G

blue astronomy - H

yellow astronomy - I

red astronomy - J

orange astronomy - K

infrared astronomy - L

radio astronomy - M

File:280557main oblate purplesun HI.jpg .

File:Wfullb.jpg .

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File:Sun in X-rays Recovered.png .

File:Sun5GHz.jpg .

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File:Neusun1 superk1.jpg .

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File:Latest nsoHe.gif .

File:Blueberrysun friedman 1296.jpg .

File:Gamma sun1.jpg .

19 Which of the following are green radiation astronomy phenomena associated with the Sun?

	the color of the upper rim as seen from Earth
	an excess brightness at or near the edge of the Sun
	the iron XIV green line
	neutron emission
	polar coronal holes
	meteor emission
	changes in the line-blanketing

20 True or False, A star-forming region is a region of the celestial sphere within which predominately very young stellar objects (YSOs) are located and their formation is likely occurring.

	TRUE
	FALSE

21 Which of the following is a shell star?

	Gamma Cassiopeiae
	Capella
	Sun
	Beta Canis Minoris
	Tau Ceti
	Achernar

22 Alpha Centauri A as a star has what green astronomy property?

	it's a primordial population III star
	it passes once a year across the Lockman Hole
	silicates have been discovered in its interior structure
	it has a surface temperature of 5790 K
	optical reflectance studies have found evidence of magnesium
	it has a surface temperature of ~700 K

23 Which stars of the alpha Centauri system are known to have stellar active regions?

	Proxima Centauri
	Alpha Centauri B
	Barnard's star
	Alpha Centauri A
	Rigel Kent
	Alpha Centauri C
	Alpha Centauri D

24 Complete the text:

Match up the type of star with each of the characteristics below:

solar twin - A

solar analog - B

solar type - C

double star - D

binary - E

visual binary - F

astrometric binary - G

spectroscopic binary - H

eclipsing binary - I

detached binary - J

semidetached binary - K

contact binary - L

common-envelope binary - M

area of gravitational pull exceeds the other component .

same line of sight .

wobbling around a point .

no close companion with an orbital period of ten days or less .

resolved binary using visual astronomy .

periodic variation in radial velocity .

each component fills the other's area of gravitational pull .

F8V through K2V .

unstable mass transfer from one to the other .

mutual eclipses .

two orbiting around each other

no stellar companion .

one component does not exceed the gravitational pull area .

25 Which of the following is a barium star?

	Alpha Camelopardalis
	Zeta Capricorni
	TT CVn
	S Camelopardalis
	HR 107
	HR 774

26 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

27 Which of the following is a mercury-manganese star?

	Alpheratz
	Alrakis
	20 Tauri
	Procyon
	Canopus
	γ Canis Majoris

28 Complete the text:

Match up the white dwarf classification with its distinctive characteristic:

DA - A

DB - B

DC - C

DO - D

DQ - E

DX - F

DZ - G

a helium-rich atmosphere, indicated He II spectral lines .

a helium-rich atmosphere, indicated He I spectral lines .

spectral lines are insufficiently clear to classify .

no strong spectral lines .

a metal-rich atmosphere .

a carbon-rich atmosphere

a hydrogen-rich atmosphere .

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

	TRUE
	FALSE

30 Complete the text:

Match up the approximate luminosity class with each of the stellar class possibilities below:

0 - A

I - B

II - C

III - D

IV - E

V - F

VI - G

VII - H

giants .

supergiants .

white dwarfs .

main-sequence .

bright giants .

subdwarfs .

subgiants

hypergiants .

31 Which of the following are characteristics of a solar-like binary?

	Teff ≤ 6000 K
	break up of a triple-component stellar system
	none of the captured bodies localize near the Sun
	some captured bodies may localize near Jupiter
	the Jupiter system may be a control group

32 Complete the text:

Solar-type stars are stars with a B-V color between and 0.80.

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

	TRUE
	FALSE

34 Which of the following is not a spectral class B star?

	Spica
	Tau Canis Majoris
	Bellatrix
	Rigel
	Regulus
	Achernar

35 Complete the text:

Match up the observation with the binary star:

Sirius A and B - A

Algol A and B - B

Albireo - C

WISE J1049-5319 - D

Mizar A - E

Minkowski 2-9 - F

File:New-binary-star-third-closest-to-sun-3.jpg .

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File:MizarA npoi big.gif

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36 Which of the following is not a spectral class M star?

	Betelgeuse
	Antares
	Proxima Centauri
	Barnard's star
	VY Canis Majoris
	Algol B

37 Complete the text:

Match up the effective temperature with its spectral class:

O - A

B - B

A - C

F - D

G - E

K - F

M - G

L - H

T - I

Y - J

7,000 K .

2,000 K

15,000 K .

4,000 K .

400 K .

9,000 K .

3,000 K .

5,500 K

45,000 K .

1,000 K .

38 True or False, Alshain may be the first yellow source in the constellation Aquila.

	TRUE
	FALSE

39 Which of the following is not a spectral class G star?

	Alpha Centauri A
	Capella
	Sun
	Procyon
	Tau Ceti
	Kepler-22

40 Complete the text:

Capella B has a surface temperature of approximately , is spectral type , has an orbital period with Capella A of about , and is a variable.

41 Which of the following is a spectral class S star?

	BD Camelopardalis
	S Ursae Majoris
	Chi Cygni
	Deneb
	Altair
	Fomalhaut

42 The Sun as a star has what geographical property?

	it's a primordial population III star
	it passes once a year across the Lockman Hole
	silicates have been discovered in its interior structure
	optical reflectance studies have found evidence of magnesium
	it has a surface temperature of ~700 K
	it has a longitude and latitude grid system for locating active regions

43 Which of the following is a lead (Pb) star?

	V Arietis
	Bellatrix
	Rigel
	LP 625-44
	Regulus
	Achernar

44 Complete the text:

Magnetic fields can be created in stratified (non-convective) layers in a rotating star.

45 Imaging brown dwarfs involve which of the following:

	far-infrared (submillimeter) observations at 350 microns
	neutrino detection
	heating of the nearby gas and dust
	near-infrared covering 1.3 and 2.2 microns
	infrared covering 4.5 and 8.0 microns

46 True or False, HR 4731, α² Cru is an infrared source in the constellation Crux.

	TRUE
	FALSE

47 Complete the text:

Match up the star with the constellation:

Capella - A

Sirius - B

Deneb - C

Anser - D

Altair - E

Vega - F

Vulpecula .

Canis Major .

Lyra .

Cygnus .

Aquila

Auriga .

48 Which of the following is not a spectral class K star?

	Alpha Centauri B
	Epsilon Eridani
	Arcturus
	Aldebaran
	Tau Ceti
	Algol B

49 True or False, The Sun may be a first radio source in the constellation Pisces.

	TRUE
	FALSE

50 Which of the following is or may be an original binary companion to the Sun?

	the planet Mercury
	Ouranus
	Saturn
	Jupiter
	Earth
	Nemesis

51 Phenomena associated with some brown dwarfs are which of the following?

	lithium
	a temperature well below the stellar range
	methane absorption
	the lithium test
	X-rays
	T dwarfs

52 Complete the text:

While exceptions may occur, match up the star class letter with each of the X-ray possibilities below:

star class - O

star class - B

star class - A

star class - F

star class - G

star class - K

star class - M

LX >> Lv .

constant X-ray luminosity across the class

independent of visual luminosity .

LX ~ 10-3Lbol .

abrupt onset of X-ray emission across the class .

LX ~ 10-7Lbol .

LX << 10-3Lbol .

53 Phenomena associated with a solar analog star are

	no stellar companion
	temperature within 500 K solar
	metallicity of 50-200% solar
	orbital period of greater than 11 d
	K0V permitted
	K1V permitted

54 True or False, BH Centauri is an overcontact system.

	TRUE
	FALSE

55 Which of the following are theoretical radiation astronomy phenomena associated with a star?

	possible orbits
	a hyperbolic orbit
	nuclear fusion at its core
	nuclear fusion in its chromosphere
	near the barycenter of its planetary system
	accretion
	electric arcs
	impact craters
	radar signature

Hypotheses

Main resource: Hypotheses

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

See also

• Astronomy/Quiz
• 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

{{Principles of radiation astronomy}}