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

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

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


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.


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

Sirius A

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.


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) .
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
S Camelopardalis
HR 107
HR 774

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


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?


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.


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

Alpha Camelopardalis
R Leporis
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
280557main oblate purplesun HI.jpg
Coronal Mass Ejection.gif
Sun image through solar telescope.jpg
Sun in X-rays Recovered.png
Neusun1 superk.jpg
Orange Sun in Boracay, Philippines.jpg
Latest nsoHe.gif
Blueberrysun friedman 1296.jpg
Gamma sun.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.


21 Which of the following is a shell star?

Gamma Cassiopeiae
Beta Canis Minoris
Tau Ceti

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
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?

20 Tauri
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.


30 Complete the text:

Match up the approximate luminosity class with each of the stellar class possibilities below:
0 - A
I - B
II - C
IV - E
V - F
VI - G
giants .
supergiants .
white dwarfs .
main-sequence .
bright giants .
subdwarfs .
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.


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

Tau Canis Majoris

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
Sirius A and B Hubble photo.jpg
Planetary Nebula M2-9.jpg
MizarA npoi big.gif
Algol AB movie imaged with the CHARA interferometer - labeled.gif

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

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.


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

Alpha Centauri A
Tau Ceti

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

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
LP 625-44

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.


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 .
Auriga .

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

Alpha Centauri B
Epsilon Eridani
Tau Ceti
Algol B

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


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

the planet Mercury

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

a temperature well below the stellar range
methane absorption
the lithium test
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.


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
electric arcs
impact craters
radar signature


Main source: Hypotheses
  1. The current metallicity of a star may depend on the presence of coronal clouds.

See also[edit]

External links[edit]