GALAXIES Reading Comprehension
... Our solar system lies within the Milky Way galaxy. The Milky Way galaxy contains over 200 billion stars and has a diameter of up to 120,000 light years. Our solar system orbits around the Milky Way once every 200-250 million years. You can see the Milk ...
... Our solar system lies within the Milky Way galaxy. The Milky Way galaxy contains over 200 billion stars and has a diameter of up to 120,000 light years. Our solar system orbits around the Milky Way once every 200-250 million years. You can see the Milk ...
Distribution and Properties of the ISM
... • exhaustion of dynamically collapsing reservoir? – masses determined by molecular cloud properties? – competition with surrounding stars for a common reservoir? ...
... • exhaustion of dynamically collapsing reservoir? – masses determined by molecular cloud properties? – competition with surrounding stars for a common reservoir? ...
ASTR-1020: Astronomy II Course Lecture Notes - Faculty
... iii) It will experience mass loss (perhaps a substantial amount) by the shock and radiation pressure of the blast. f ) If the star in it final thermonuclear stages has too small a mass to supernova, it will lose its envelope through the creation of a planetary nebula (which will have little impact o ...
... iii) It will experience mass loss (perhaps a substantial amount) by the shock and radiation pressure of the blast. f ) If the star in it final thermonuclear stages has too small a mass to supernova, it will lose its envelope through the creation of a planetary nebula (which will have little impact o ...
Disk
... for all spectral types (if Mdisk comparable to Mstar) • Tidal interaction with the stellar companions: more effective to destroy outer regions of disks in O stars than in B-stars ...
... for all spectral types (if Mdisk comparable to Mstar) • Tidal interaction with the stellar companions: more effective to destroy outer regions of disks in O stars than in B-stars ...
High-Mass Star Formation
... CAVEAT: may be contribution from compact components (UCHIIs or disks) within central beam W3(OH) UCHII may contribute as much as 25% of the central flux assuming optically thick free-free scaled from 3mm flux (Wilner, Welch, & Forster 1995) ...
... CAVEAT: may be contribution from compact components (UCHIIs or disks) within central beam W3(OH) UCHII may contribute as much as 25% of the central flux assuming optically thick free-free scaled from 3mm flux (Wilner, Welch, & Forster 1995) ...
Astronomy - Scioly.org
... 23. All stars are composed of mostly hydrogen and helium, yet many stars have no lines for hydrogen or helium in their spectrum. What causes this apparent contradiction? a. Spectral lines are created in the lower atmospheres of stars, and for many stars hydrogen and helium are hidden below the atmo ...
... 23. All stars are composed of mostly hydrogen and helium, yet many stars have no lines for hydrogen or helium in their spectrum. What causes this apparent contradiction? a. Spectral lines are created in the lower atmospheres of stars, and for many stars hydrogen and helium are hidden below the atmo ...
life
... •We have the ability to destroy civilization •We are also damaging our environment •We are using up non-renewable resources ...
... •We have the ability to destroy civilization •We are also damaging our environment •We are using up non-renewable resources ...
Astr604-Ch1
... A star can be defined as a body that satisfies two conditions: (a) it is bound by self-gravity; (b) it radiates energy supplied by an internal source. From the first condition it follows that the shape of such a body must be a spherical, for gravity is a spherical symmetric force field. Or, it might ...
... A star can be defined as a body that satisfies two conditions: (a) it is bound by self-gravity; (b) it radiates energy supplied by an internal source. From the first condition it follows that the shape of such a body must be a spherical, for gravity is a spherical symmetric force field. Or, it might ...
The Milky Way
... The spectra of stars are more complicated than pure blackbody spectra. They contain characteristic lines, called absorption lines. With what we have learned about atomic structure, we can now understand how those lines are formed. ...
... The spectra of stars are more complicated than pure blackbody spectra. They contain characteristic lines, called absorption lines. With what we have learned about atomic structure, we can now understand how those lines are formed. ...
HOMEWORK #1
... Algol is the most famous eclipsing binary star system. The two stars orbit each other every 2 days 20 hours 49 minutes and periodically eclipse each other from the perspective of Earth. On the evenings of October 9 and 12, you can observe the eclipse by naked eye. The two stars will appear as a sing ...
... Algol is the most famous eclipsing binary star system. The two stars orbit each other every 2 days 20 hours 49 minutes and periodically eclipse each other from the perspective of Earth. On the evenings of October 9 and 12, you can observe the eclipse by naked eye. The two stars will appear as a sing ...
Lecture 4 - Twin Cities - University of Minnesota
... The End of Planet Formation • Eventually the solar wind pushed all of the gas out into interstellar space • Sun was spinning much more quickly • Eventually the Sun’s magnetic field dispersed its angular momentum ...
... The End of Planet Formation • Eventually the solar wind pushed all of the gas out into interstellar space • Sun was spinning much more quickly • Eventually the Sun’s magnetic field dispersed its angular momentum ...
The Brightness of Stars
... a certain color range The filters are simply colored glass that goes over the mirror or lens of a telescope Astronomers say Vega has an MV of 0, which means Vega has an absolute magnitude of 0 in the V (for visible--no filters) color band ...
... a certain color range The filters are simply colored glass that goes over the mirror or lens of a telescope Astronomers say Vega has an MV of 0, which means Vega has an absolute magnitude of 0 in the V (for visible--no filters) color band ...
The Sun and the Stars
... Systems may be: (i) single-lined (only one component displays lines) or (ii) double-lined (both components display lines) Lines are shifted in wavelength by an amount relative to the rest-wavelength 0, ,blueward (star approaching), and redward (star receding) [doppler effect], such that ...
... Systems may be: (i) single-lined (only one component displays lines) or (ii) double-lined (both components display lines) Lines are shifted in wavelength by an amount relative to the rest-wavelength 0, ,blueward (star approaching), and redward (star receding) [doppler effect], such that ...
HOMEWORK #1
... Algol is the most famous eclipsing binary star system. The two stars orbit each other every 2 days 20 hours 49 minutes and periodically eclipse each other from the perspective of Earth. On the evenings of October 9 and 12, you can observe the eclipse by naked eye. The two stars will appear as a sing ...
... Algol is the most famous eclipsing binary star system. The two stars orbit each other every 2 days 20 hours 49 minutes and periodically eclipse each other from the perspective of Earth. On the evenings of October 9 and 12, you can observe the eclipse by naked eye. The two stars will appear as a sing ...
Note
... • walls heated • emit and reabsorb radiation • interior of chamber in thermodynamic equilibrium • leakage in or out of the whole is small • Stellar photospheres approximate blackbodies • Most photons are reabsorbed near where they are emitted • Higher in the atmosphere, a star departs from a black b ...
... • walls heated • emit and reabsorb radiation • interior of chamber in thermodynamic equilibrium • leakage in or out of the whole is small • Stellar photospheres approximate blackbodies • Most photons are reabsorbed near where they are emitted • Higher in the atmosphere, a star departs from a black b ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.