Fluorine abundances in dwarf stars of the solar neighbourhood⋆
... synthesised in the merger of a helium white dwarf and a carbonoxygen white dwarf. Which of the above-mentioned sources is the most important one is currently under debate. In spite of the many uncertainties regarding the origin of F in the Galaxy, there have not been many observational studies of th ...
... synthesised in the merger of a helium white dwarf and a carbonoxygen white dwarf. Which of the above-mentioned sources is the most important one is currently under debate. In spite of the many uncertainties regarding the origin of F in the Galaxy, there have not been many observational studies of th ...
The physics of white dwarfs
... that end their evolution with masses in excess of this limit have gravitational self-attraction too great to be counterbalanced by the pressure of the degenerate electrons and are doomed to ultimate collapse. Supernovae are external manifestations of such catastrophes. In some cases, even the violen ...
... that end their evolution with masses in excess of this limit have gravitational self-attraction too great to be counterbalanced by the pressure of the degenerate electrons and are doomed to ultimate collapse. Supernovae are external manifestations of such catastrophes. In some cases, even the violen ...
Galaxy Structure
... the Keplerian law at a distance of 50 kpc. However, measurements indicate that the rotation curve of the Milky Way essentially stays flat. It actually may even still increase at the distance of the MAGELLANIC CLOUDS and the MAGELLANIC STREAM. Murai (1997) has clarified, on the basis of recent observ ...
... the Keplerian law at a distance of 50 kpc. However, measurements indicate that the rotation curve of the Milky Way essentially stays flat. It actually may even still increase at the distance of the MAGELLANIC CLOUDS and the MAGELLANIC STREAM. Murai (1997) has clarified, on the basis of recent observ ...
Nebula
... explosions, the death throes of massive, short-lived stars. The material thrown off from the supernova explosion is ionised by the supernova remnant. One of the best examples of this is the Crab Nebula, in Taurus. It is the result of a recorded supernova in the year 1054 and at the centre of the neb ...
... explosions, the death throes of massive, short-lived stars. The material thrown off from the supernova explosion is ionised by the supernova remnant. One of the best examples of this is the Crab Nebula, in Taurus. It is the result of a recorded supernova in the year 1054 and at the centre of the neb ...
The Starry Messenger
... Great indeed are the things which in this brief treatise I propose for observation and consideration by all students of nature. I say great, because of the excellence of the subject itself, the entirely unexpected and novel character of these things, and finally because of the instrument by means of ...
... Great indeed are the things which in this brief treatise I propose for observation and consideration by all students of nature. I say great, because of the excellence of the subject itself, the entirely unexpected and novel character of these things, and finally because of the instrument by means of ...
2-star-life-cycle-and-star-classification
... the same luminosity as the star Aldebaran approximately the same temperature as the Rigel. Algol is best classified as a A) main sequence star B) red giant star C) white dwarf star D) red dwarf star 60. Two stars of the same color are plotted on an H-R diagram. Star A is more luminous than star B. W ...
... the same luminosity as the star Aldebaran approximately the same temperature as the Rigel. Algol is best classified as a A) main sequence star B) red giant star C) white dwarf star D) red dwarf star 60. Two stars of the same color are plotted on an H-R diagram. Star A is more luminous than star B. W ...
epsilon Aur
... Epsilon Aurigae is not the brightest eclipsing binary, nor is it the one with the deepest eclipses. What makes it distinctive is its long period of over 27 years, coupled with the mystery surrounding the nature of the secondary object in the system. The last primary eclipse took place during 1982-84 ...
... Epsilon Aurigae is not the brightest eclipsing binary, nor is it the one with the deepest eclipses. What makes it distinctive is its long period of over 27 years, coupled with the mystery surrounding the nature of the secondary object in the system. The last primary eclipse took place during 1982-84 ...
Planetary system formation in thermally evolving viscous
... entropy/vortensity corotation torque saturation. The density within the horseshoe region has the characteristic structure for a disc that exerts a positive unsaturated corotation torque: a positive density perturbation leading the planet and a negative perturbation trailing it. The black lines delin ...
... entropy/vortensity corotation torque saturation. The density within the horseshoe region has the characteristic structure for a disc that exerts a positive unsaturated corotation torque: a positive density perturbation leading the planet and a negative perturbation trailing it. The black lines delin ...
A search for debris disks in the Herschel
... are least likely to be QSOs or unresolved galaxies and the most likely to be debris disks. We apply an initial photometric distance cut of 200 pc to select the most likely candidate disks, though Fig. 2 shows that there are a further 7 objects at 200−400 pc distance that could be massive or luminous ...
... are least likely to be QSOs or unresolved galaxies and the most likely to be debris disks. We apply an initial photometric distance cut of 200 pc to select the most likely candidate disks, though Fig. 2 shows that there are a further 7 objects at 200−400 pc distance that could be massive or luminous ...
16_Testbank
... 21) Which of the following may be caused by a protostellar disk? A) protostellar jets B) protostellar winds C) accretion of material onto the star D) relatively slow protostellar rotation E) all of the above Answer: E 22) When does a protostar become a true star? A) when the star is 1 million years ...
... 21) Which of the following may be caused by a protostellar disk? A) protostellar jets B) protostellar winds C) accretion of material onto the star D) relatively slow protostellar rotation E) all of the above Answer: E 22) When does a protostar become a true star? A) when the star is 1 million years ...
as PDF - Minnesota Academy of Science
... easy to explain why oxygen should be represented by bright instead of dark lines, in the solar spectrum, while these lines are not seen in the spectrum of the chomosphere, which consists of bright lines. Dr. Schuster replies that oxygen under different circumstances presents four different spectra, ...
... easy to explain why oxygen should be represented by bright instead of dark lines, in the solar spectrum, while these lines are not seen in the spectrum of the chomosphere, which consists of bright lines. Dr. Schuster replies that oxygen under different circumstances presents four different spectra, ...
The Milky Way Galaxy (ch. 23)
... How are the different kinds of galaxies distributed in space? We are trying to make a map of the entire universe, by locating all its contents. To do this we need big telescopes (to see faint objects, since they are far away), and some way to get distances to very distant objects. So we are still “c ...
... How are the different kinds of galaxies distributed in space? We are trying to make a map of the entire universe, by locating all its contents. To do this we need big telescopes (to see faint objects, since they are far away), and some way to get distances to very distant objects. So we are still “c ...
Sample Exam for 3 rd Astro Exam
... A. In the galactic halo. B. In the galactic nuclear bulge C. Beyond the Sun above and below the galactic mid-plane D. Perpendicular to the galactic plane. E. In the galactic mid-plane 16. True or false: The Sun is located within the galactic gas layer of the Milky Way A. True B. False C. I have no @ ...
... A. In the galactic halo. B. In the galactic nuclear bulge C. Beyond the Sun above and below the galactic mid-plane D. Perpendicular to the galactic plane. E. In the galactic mid-plane 16. True or false: The Sun is located within the galactic gas layer of the Milky Way A. True B. False C. I have no @ ...
Stellar Spectroscopy (GA 3.0) - National Optical Astronomy
... measure of the quantity of each color of light (or more specifically, the amount of each wavelength of light). It is a powerful tool in astronomy. In fact, most of what we know in astronomy is a result of spectroscopy: it can reveal the temperature, velocity and composition of an object as well as b ...
... measure of the quantity of each color of light (or more specifically, the amount of each wavelength of light). It is a powerful tool in astronomy. In fact, most of what we know in astronomy is a result of spectroscopy: it can reveal the temperature, velocity and composition of an object as well as b ...
Document
... • Like classical AO but more of the same • The wavefront error minimized on axis – Large number of degrees do freedom (i.e. +/- nb of actuators) of the deformable mirror. – Minimal lag (delay) in the control system – Low noise in the wavefront sensor: Bright guide star – “No” field of view – WFS non ...
... • Like classical AO but more of the same • The wavefront error minimized on axis – Large number of degrees do freedom (i.e. +/- nb of actuators) of the deformable mirror. – Minimal lag (delay) in the control system – Low noise in the wavefront sensor: Bright guide star – “No” field of view – WFS non ...
BRC_prop3 - CoolWiki
... molecular clouds, emission stars, and IR sources. In a preliminary analysis, Allen et al. (2011) found both Class I and Class II YSOs in these BRCs. Beyond that, these two BRCs have not been studied in detail. We will investigate these regions in detail using Spitzer Space Telescope archival data in ...
... molecular clouds, emission stars, and IR sources. In a preliminary analysis, Allen et al. (2011) found both Class I and Class II YSOs in these BRCs. Beyond that, these two BRCs have not been studied in detail. We will investigate these regions in detail using Spitzer Space Telescope archival data in ...
Here - SDSU Astronomy Department and Mount Laguna Observatory
... 8. What is the celestial equator, and how is it related to Earth’s equator? How are the north and south celestial poles related to Earth’s axis of rotation? 11. Why does the tilt of Earth’s axis relative to its orbit cause the seasons as Earth revolves around the Sun?... 15. Why is it warmer in the ...
... 8. What is the celestial equator, and how is it related to Earth’s equator? How are the north and south celestial poles related to Earth’s axis of rotation? 11. Why does the tilt of Earth’s axis relative to its orbit cause the seasons as Earth revolves around the Sun?... 15. Why is it warmer in the ...
Lives of the Stars Lecture 5: Star birth
... easily destroyed. Helium-4 is the only really stable one, so lots of Helium-4 was formed in the next few seconds. But apart from tiny amounts of Lithium-7, no other element can be easily formed. So when the era of fusion ended, about 3½ minutes after the Big Bang, the universe consisted of lots of h ...
... easily destroyed. Helium-4 is the only really stable one, so lots of Helium-4 was formed in the next few seconds. But apart from tiny amounts of Lithium-7, no other element can be easily formed. So when the era of fusion ended, about 3½ minutes after the Big Bang, the universe consisted of lots of h ...