Main sequence stars - Study guides, Class notes & Summaries

A hydrogen atom that has been photoionized is _____. - ️️An ion, a proton, and positively charged. A main sequence O star will have a ___ temperature, a ____ radius, a ____ luminosity and a ____ absolute magnitude than a main sequence G star like the Sun. - ️️larger, larger, larger, smaller A star that is 50 pc away will show a parallax of _____. - ️️.02 arc secs A star with T=10,000 K (spectral type A) shows strong absorption lines from _______. - ️️neutral hydrogen (H I) ac...

The figure below shows an H-R diagram, with five stars labeled A through E. Which star has the highest temperature? - correct answer A If the sun was not currently in hydrostatic equilibrium, we would see? - correct answer the suns radius increasing and decreasing Which part of the sun is visible around the shadow of the moon? - correct answer chromosphere Stars that have spectral Type B _____ in temperature compared with stars that have spectral type M. - correct answer are hotter T...

Astronomy Unit 8 Practice Exam Questions & Answers. Ranking Task: The Size of Planets, Stars, and Stellar Remnants Part A: Listed following are several astronomical objects. Rank these objects based on their diameter, from largest to smallest. (Note that the neutron star and black hole in this example have the same mass to make your comparison easier, but we generally expect black holes to have greater masses than neutron stars.) - CORRECT ANSWER -main-sequence star of a spectral type A -...

about 91% (by number) of the atoms in the sun are the element - ️️hydrogen Age of the Universe - ️️13.7 billion years all the energy of the sun is generated in the - ️️core alpha particle - ️️A cluster of 2 protons and 2 neutrons emitted from a nucleus in one type of radioactivity an astronomer discovers a new star and wants to measure its temperate. she could do this by: - ️️take a spectrum of the star and determine the spectral type Astronomers did star counts in all d...

Space Exploration|Complete Questions with A+ Graded Answers main sequence a diagonal area on an H-R diagram that includes more than 90 percent of all stars white dwarf A small, hot, dim star that is the leftover center of an old star Luminosity the true brightness of an object light year the distance light travels in one year blueshifted the doppler shift toward shorter wavelengths of light from an approaching object Redshifted stars moving away from Earth Ne...

What are the characteristics of disk stars (yellow) of the Milky Way Galaxy? - High mass stars, the Sun, youngest stars, and stars that all orbit in nearly the same plane What are the characteristics of halo stars (green) of the Milky Way Galaxy? - Globular clusters, oldest stars, stars whose orbits can be inclined at any angle, and stars with smallest abundance of heavy elements. What are the characteristics of spiral galaxies? - They contain abundant clouds of cool gas and dust, are rare...

Astro 7N PSU Unit 4Open star clusters - correct answer •have hundreds to thousands of stars •stars formed at the same time from the same gas cloud •bound by gravity for a few million years •lots of blue stars visible because of relatively young ages •Pleiades is an example Globular star clusters - correct answer -hundreds of thousands to millions of stars -yellow in color with red giants -many have ages around 10 billion years, considered old Ages of star clusters - correct...

Astro 102 Final Exam Ultimate Study Guide | 100% Correct Answers | Verified | Latest 2024 Version What are the characteristics of disk stars (yellow) of the Milky Way Galaxy? - High mass stars, the Sun, youngest stars, and stars that all orbit in nearly the same plane What are the characteristics of halo stars (green) of the Milky Way Galaxy? - Globular clusters, oldest stars, stars whose orbits can be inclined at any angle, and stars with smallest abundance of heavy elements. Wh...

PSCI 21 Exam Questions with Correct Answers The sun is plotted near the middle of the HR diagram - Answer-True Suppose a star has an absolute magnitude of 2.47 and an apparent magnitude of 7.47 how far away is the star in parsecs - Answer-100 I need typical HR diagram 90% of the stars are - Answer-Main sequence In about 5 billion years of sun will - Answer-Turn into a red giant The sun has an absolute magnitude of 4.86. And the Star Sirius has an absolute magnitude of 1.42. Determin...

A black car left in the sunlight becomes hotter than a white car left in the sunlight under the same conditions because - ️️the white car reflects more sunlight than the black car. A planet is detected via the Doppler technique. The velocity change of the star is a measure of - ️️the planet's mass and orbital distance. A planet will have bands in its atmosphere like Jupiter and Saturn if - ️️the planet has a high temperature. A prism is able to spread white light out into a spect...