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"Mini Supernova" Explosion Could Have Big Impact. Credit: X-ray: NASA/CXC/RIKEN/D.Takei et al; Optical: NASA/STScI; Radio: NRAO/VLA.

Variable stars is a lecture about variable stars.

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Quiz

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1 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.

2 Which of the following is not a prominent contributor associated with a variable star?

star spots
chromospheric activity
rotation
brightness fluctuations
flares
spot coverage fraction

3 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.

4 Yes or No, BH Centauri is an overcontact system.

Yes
No

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 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

.

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 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

.

11 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

12 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?

13 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

.

.

.

.
File:MizarA npoi big.gif

.

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

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

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

BD Camelopardalis
S Ursae Majoris
Chi Cygni
Deneb
Altair
Fomalhaut


Hypotheses

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

See also

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{{Radiation astronomy resources}}

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