ASTR 114 Astronomy - Final Exam "Cheat Sheet" | Latest

 -1.5 magnitude Sirius appears 25x brighter than 2 magnitude Polaris.  “All neutron stars are pulsars, but not all pulsars are neutron stars” FALSE  “Spectroscopic Binary” is the term given to a pair of stars that we can determine are orbiting each other only by measuring their periodic Doppler shifts.  A 6.8 solar mass neutron star does NOT exist.  A loop of gas and charged particles following the magnetic field lines between sunspot’s poles is a Prominence/Filiment.  A particular star has an angle of parallax of 0.1 arcsec. The distance to this star is about 33 light years.  A particular star in a binary system orbits the other with an avg orbital radius of 3 AU and a period of 5yrs. The sum of the masses of the two stars is 1.1.  A planet whose distance from the Sun is 16 AU would have an orbital period of 64 years.  A planet whose distance from the Sun is 3 AU would have an orbital period of (the square root of ) 27 Earth-years.  A planetary nebula is the ejected envelope, often bipolar, of a red giant surrounding a stellar core remnant.  A protostar moves onto the main sequence with a mass of 0.18 solar masses. Spectral Type ; M.  A protostar moves onto the main sequence with a mass of 3.2 solar masses. The luminosity of the star, it’s spectral type, is type B.  A protostar of 50 Solar Masses will probably turn into a type O main sequence star.  A pulsating variable star with a period of 10 days would be a Cepheid having an absolute magnitude of -4.2.  A pulsating variable star with a period of 50 days would be a Cepheid having an absolute magnitude of -6.3.  A radio telescope and an optical telescope of the same size do NOT have the same Diffraction Limit.  A sidereal year is defined as the time is takes for the earth to complete an orbit around the Sun.  A Solar eclipse occurs only when the Moon is NEW.  A star (no matter its mass) spends most of its life as a Main Sequence star.  A star has an app mag of +3 and an abs mag of -3. The distance to this star is 158pc.  A star has an apparent magnitude of +7 and an absolute magnitude of -4. The distance to the star is 1585pc.  A star is on the horizontal branch of the HR diagram. It is burning BOTH hydrogen and helium.  A star of apparent magnitude +5 appears Fainter than a star of AM +3.  A star of the Sun’s diameter, but five times hotter, must be 625 more luminosity than the Sun.  A star of the Sun’s diameter, but twice as hot, must be 16x more luminous than the Sun.  A star’s absolute magnitude and its apparent magnitude have the same numerical value. This star is 10pc from earth.  A super nova that occurred 30,000 years ago in a galaxy 100,000 light years away will be observed on Earth 70,000 years from now.  A year is defined as the time it takes for the Earth to complete an orbit around the Sun.  About 5 million planet Earths could fit inside the Sun.  According to Hubble’s classification, the Milky Way would most likely be classified as SBb.  According to Hubble’s Law, the greater the galaxy’s redshift, the farther it is from us.  According to Newton’s Law of Universal Gravitation, if the Moon were six times further from Earth, the force by Earth on the Moon would decrease by a factor of 36.  According to the Hubble Law graph shown, a galaxy cluster with a recessional velocity of 25000km/s will be 400million pcs away.  According to Wein’s Displacement Law, if the surface temp of an object is increased by a factor of 6, its peak wavelength will be decreased by a factor of 6.  Adaptive Optics: it reduces blurring caused by atmospheric turbulence for telescopes on the ground.  After a massive-star supernova, either a neutron star or a black hole is what’s left behind.  All but one of the following statements describe why scientists doubt the solar sunspot cycle affects global climate. Solar winds can affect satellite communications.  All the following statements are true, which one explains the reason why there is NOT a solar eclipse at every new moon? : The orbital plane of the moon is tilted by about 5degrees to the ecliptic plane.  Although it is difficult to tell from our vantage point inside the galaxy, astronomers suspect that the Milky Way is a spiral.  An O-star has a hotter surface temperature than the Sun. Threfore, com