STELLAR STRUCTURE AND EVOLUTION
... • Star clusters....these reveal how stars evolve with time • Nuclear physics...energy source, synthesis of heavy elements No direct information about physical conditions in stellar interiors (except from helioseismology and solar neutrinos) No direct evidence for stellar evolution......typical times ...
... • Star clusters....these reveal how stars evolve with time • Nuclear physics...energy source, synthesis of heavy elements No direct information about physical conditions in stellar interiors (except from helioseismology and solar neutrinos) No direct evidence for stellar evolution......typical times ...
printer-friendly sample test questions
... 2. How many times greater is Sun’s diameter than Earth’s diameter? A. 19 times B. 109 times C. 1109 times D. 11,009 times 3. Compared to other stars in the Milky Way Galaxy, the Sun’s diameter classifies it as a A. micro-sized star. B. smallest-sized star. C. medium-sized star. D. largest-sized star ...
... 2. How many times greater is Sun’s diameter than Earth’s diameter? A. 19 times B. 109 times C. 1109 times D. 11,009 times 3. Compared to other stars in the Milky Way Galaxy, the Sun’s diameter classifies it as a A. micro-sized star. B. smallest-sized star. C. medium-sized star. D. largest-sized star ...
Question paper - Unit 5 (6PH05) - January 2012
... 4 A Hertzsprung-Russell diagram is plotted for an old star cluster. Compared with a young cluster containing a similar number of stars there will be fewer A light main sequence stars. B massive main sequence stars. C red giant stars. D white dwarf stars. (Total for Question 4 = 1 mark) 5 About 25% o ...
... 4 A Hertzsprung-Russell diagram is plotted for an old star cluster. Compared with a young cluster containing a similar number of stars there will be fewer A light main sequence stars. B massive main sequence stars. C red giant stars. D white dwarf stars. (Total for Question 4 = 1 mark) 5 About 25% o ...
luminosities
... D. Luminosity III. The Diameters of Stars A. Luminosity, Radius, and Temperature B. The H-R Diagram C. Giants, Supergiants, and Dwarfs ...
... D. Luminosity III. The Diameters of Stars A. Luminosity, Radius, and Temperature B. The H-R Diagram C. Giants, Supergiants, and Dwarfs ...
CARBON STARS
... Spectral Class - Classical • Originally classified by Shane (1928) as R and N stars • R0-R3 -> relatively weak C2 and CN bands • R5-R8 -> strong bands and continuum down to 3900Å • N-stars -> also strong bands of C2 and CN ...
... Spectral Class - Classical • Originally classified by Shane (1928) as R and N stars • R0-R3 -> relatively weak C2 and CN bands • R5-R8 -> strong bands and continuum down to 3900Å • N-stars -> also strong bands of C2 and CN ...
BAS - Monthly Sky Guide
... Two prominent and widely spaced stars that make good alignment stars are Antares and Alpha Crux. We’ve pointed out Antares before as a good alignment star. Antares has a distinctive bright orange colour that is impossible to mistake for any other star in this part of the sky. Acrux or Alpha Crux is ...
... Two prominent and widely spaced stars that make good alignment stars are Antares and Alpha Crux. We’ve pointed out Antares before as a good alignment star. Antares has a distinctive bright orange colour that is impossible to mistake for any other star in this part of the sky. Acrux or Alpha Crux is ...
Slide 1
... closest to the Sun? Which of these stars is the brightest? Which of these stars has the largest diameter? Which of these stars has the lowest temperature? ...
... closest to the Sun? Which of these stars is the brightest? Which of these stars has the largest diameter? Which of these stars has the lowest temperature? ...
11 Stellar Remnants - Journigan-wiki
... While these remnants are dead as far as stellar evolution is concerned, many still effect those things around them. Some steal matter from there companions until they explode while some collapse even more until they reach an explosive end. ...
... While these remnants are dead as far as stellar evolution is concerned, many still effect those things around them. Some steal matter from there companions until they explode while some collapse even more until they reach an explosive end. ...
lecture
... • Two morphologies seem to be found in the Short Period Systems • Disk-Like Morphology - Transient disk is found in the tomograms. U Sge, SW Cyg, TT Hya •Stream-Like Morphology - Dominant gas seems to be along the path of the gas stream. U CrB •What causes each of these? Why do systems switch from o ...
... • Two morphologies seem to be found in the Short Period Systems • Disk-Like Morphology - Transient disk is found in the tomograms. U Sge, SW Cyg, TT Hya •Stream-Like Morphology - Dominant gas seems to be along the path of the gas stream. U CrB •What causes each of these? Why do systems switch from o ...
Estimate the Kelvin-Helmholtz timescale for a 5 solar mass star on
... and compare your result with the amount of time the star spends between points 4 and 5 in Figure 13.1” Solution: The KH timescale is estimated by the formula GM 2 KH = 0.3 ÷L R Figure 13.1 suggests the following estimates for the average luminosity of a 5 solar mass star on the subgiant branch: L ...
... and compare your result with the amount of time the star spends between points 4 and 5 in Figure 13.1” Solution: The KH timescale is estimated by the formula GM 2 KH = 0.3 ÷L R Figure 13.1 suggests the following estimates for the average luminosity of a 5 solar mass star on the subgiant branch: L ...
L12 - QUB Astrophysics Research Centre
... There is an upper limit to the mass of a white dwarf - we do not see WDs with masses > 1.4 M We will see in next lectures what the implications of this are for other phenomena in the Universe. It actually led to the discovery of dark energy! The collapse of massive stars produces two types of remna ...
... There is an upper limit to the mass of a white dwarf - we do not see WDs with masses > 1.4 M We will see in next lectures what the implications of this are for other phenomena in the Universe. It actually led to the discovery of dark energy! The collapse of massive stars produces two types of remna ...
Second and Third Black Hole Lecture
... dynamics agree within a factor of 3. This is 'great' but – dyanmical masses very difficult to ...
... dynamics agree within a factor of 3. This is 'great' but – dyanmical masses very difficult to ...
Monday, April 15
... Earth = a grain of sand The Earth orbits the Sun at a distance of one meter Proxima Centauri lies 270 kilometers (170 miles) away Barnard’s Star lies 370 kilometers (230 miles) away Less than 100 stars lie within 1000 kilometers (600 miles) ...
... Earth = a grain of sand The Earth orbits the Sun at a distance of one meter Proxima Centauri lies 270 kilometers (170 miles) away Barnard’s Star lies 370 kilometers (230 miles) away Less than 100 stars lie within 1000 kilometers (600 miles) ...
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... Energy Transport Mechanisms in Stars How does the energy get out? 1. Radiatively (photon diffusion) 2. Convectively 3. Conduction (generally not important in stars) ...
... Energy Transport Mechanisms in Stars How does the energy get out? 1. Radiatively (photon diffusion) 2. Convectively 3. Conduction (generally not important in stars) ...
Chapter 14: The Milky Way Galaxy
... Milky Way (from Earth), we see light from hydrogen atoms Doppler shifted by different amounts – this Doppler shift is used to determine how fast the stars and gas of the disk are moving (rotating). ...
... Milky Way (from Earth), we see light from hydrogen atoms Doppler shifted by different amounts – this Doppler shift is used to determine how fast the stars and gas of the disk are moving (rotating). ...
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.