Stars/Astronomy/Quiz

Stellar astronomy is a lecture about the astronomy of stars.

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Quiz
{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
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{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
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{Which of the following is not a spectral class A star? - Sirius A - Vega + Bellatrix - Deneb - Altair - Fomalhaut
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{The heavier element lines that occur in the spectrum of Vega are - lanthanum (La) + calcium (Ca) - uranium (U) + titanium (Ti) + silicon (Si) + iron (Fe)
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{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
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{True or False, RS Canum Venaticorum variables are close binary stars having active chromospheres which can cause large stellar spots. + TRUE - FALSE
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{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
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{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 { D (i) }. Plaskett's Star (HR 2422) { B (i) }. Betelgeuse { G (i) } W Ursae Majoris { F (i) }. Beta Lyrae { C (i) }. V1010 Ophiuchi { E (i) } object is confirmed to be co-moving { A (i) }. Sun { H (i) }.
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{Which of the following is a technetium star? - Alpha Camelopardalis + R Geminorum - TT CVn - S Camelopardalis - HR 107 - HR 774
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{True or False, α Sagittarii may be the first detected UV source in the constellation Sagittarius. + TRUE - FALSE
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{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
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{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. { BY Draconis|BY Draconis variables (i) }
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{Which of the following is not a spectral class F star? - Polaris - Alrakis + Bellatrix - Procyon - Canopus - Wezen
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{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
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{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
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{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? { UV Ceti (i) }
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{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
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{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 { G (i) }. { F (i) }. { A (i) }. { J (i) }. { D (i) }. { M (i) }. { E (i) }. { B (i) }. { K (i) }. { I (i) }. { L (i) }. { H (i) }. { C (i) }.
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{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
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{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
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{Which of the following is a shell star? + Gamma Cassiopeiae - Capella - Sun + Beta Canis Minoris - Tau Ceti + Achernar
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{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
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{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
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{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 { J (i) }. same line of sight { D (i) }. wobbling around a point { G (i) }. no close companion with an orbital period of ten days or less { B (i) }. resolved binary using visual astronomy { F (i) }. periodic variation in radial velocity { H (i) }. each component fills the other's area of gravitational pull { L (i) }. F8V through K2V { C (i) }. unstable mass transfer from one to the other { M (i) }. mutual eclipses { I (i) }. two orbiting around each other { E (i) } no stellar companion { A (i) }. one component does not exceed the gravitational pull area { K (i) }.
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{Which of the following is a barium star? - Alpha Camelopardalis + Zeta Capricorni - TT CVn - S Camelopardalis + HR 107 + HR 774
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{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
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{Which of the following is a mercury-manganese star? + Alpheratz - Alrakis + 20 Tauri - Procyon - Canopus + γ Canis Majoris
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{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 { D (i) }. a helium-rich atmosphere, indicated He I spectral lines { B (i) }. spectral lines are insufficiently clear to classify { F (i) }. no strong spectral lines { C (i) }. a metal-rich atmosphere { G (i) }. a carbon-rich atmosphere { E (i) } a hydrogen-rich atmosphere { A (i) }.
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{True or False, Regulus is a likely first violet source in Leo. + TRUE - FALSE
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{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 { D (i) }. supergiants { B (i) }. white dwarfs { H (i) }. main-sequence { F (i) }. bright giants { C (i) }. subdwarfs { G (i) }. subgiants { E (i) } hypergiants { A (i) }.
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{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
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{Complete the text: Solar-type stars are { main-sequence|MS (i) } stars with a B-V color between { 0.48 (i) } and 0.80.
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{True or False, Sirius is a likely first red source in Canis Major. + TRUE - FALSE
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{Which of the following is not a spectral class B star? - Spica + Tau Canis Majoris - Bellatrix - Rigel - Regulus - Achernar
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{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 { D (i) }. { A (i) }. { F (i) }. { C (i) }. { E (i) } { B (i) }.
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{Which of the following is not a spectral class M star? - Betelgeuse - Antares - Proxima Centauri - Barnard's star - VY Canis Majoris + Algol B
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{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 { D (i) }. 2,000 K { H (i) } 15,000 K { B (i) }. 4,000 K { F (i) }. 400 K { J (i) }. 9,000 K { C (i) }. 3,000 K { G (i) }. 5,500 K { E (i) } 45,000 K { A (i) }. 1,000 K { I (i) }.
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{True or False, Alshain may be the first yellow source in the constellation Aquila. + TRUE - FALSE
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{Which of the following is not a spectral class G star? - Alpha Centauri A - Capella - Sun + Procyon - Tau Ceti - Kepler-22
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{Complete the text: Capella B has a surface temperature of approximately { 5700 K (i) }, is spectral type { G0 III|G0III (i) }, has an orbital period with Capella A of about { 104 d|104.0217 d (i) }, and is a { RS Canum Venaticorum|RS CVn (i) } variable.
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{Which of the following is a spectral class S star? + BD Camelopardalis + S Ursae Majoris + Chi Cygni - Deneb - Altair - Fomalhaut
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{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
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{Which of the following is a lead (Pb) star? + V Arietis - Bellatrix - Rigel + LP 625-44 - Regulus - Achernar
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{Complete the text: Magnetic fields can be created in { stably (i) } stratified (non-convective) layers in a { differentially (i) } rotating star.
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{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
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{True or False, HR 4731, α2 Cru is an infrared source in the constellation Crux. + TRUE - FALSE
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{Complete the text: Match up the star with the constellation: Capella - A Sirius - B Deneb - C Anser - D Altair - E Vega - F Vulpecula { D (i) }. Canis Major { B (i) }. Lyra { F (i) }. Cygnus { C (i) }. Aquila { E (i) } Auriga { A (i) }.
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{Which of the following is not a spectral class K star? - Alpha Centauri B - Epsilon Eridani - Arcturus - Aldebaran + Tau Ceti - Algol B
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{True or False, The Sun may be a first radio source in the constellation Pisces. + TRUE - FALSE
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{Which of the following is or may be an original binary companion to the Sun? - the planet Mercury + Ouranus - Saturn - Jupiter - Earth - Nemesis
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{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
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{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 { M (i) }. constant X-ray luminosity across the class { B (i) } independent of visual luminosity { F (i) }. LX ~ 10-3Lbol { G (i) }. abrupt onset of X-ray emission across the class { A (i) }. LX ~ 10-7Lbol { O (i) }. LX << 10-3Lbol { K (i) }.
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{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
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{True or False, BH Centauri is an overcontact system. + TRUE - FALSE
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{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
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Hypotheses

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