H Exhaustion - University of Arizona
... • Sun will spend ~4 Gyr moving from core H exhaustion to RGB - 40% of total H consumption and lifetime ...
... • Sun will spend ~4 Gyr moving from core H exhaustion to RGB - 40% of total H consumption and lifetime ...
Hitomi Observation of the Highly Obscured High-Mass X-ray
... Assuming that the line-emitting matter follows the compact object that rotates around a companion with a mass of 30 M⊙ , a distance of 1013 cm, and an inclination angle of 45◦ , the maximum line-of-sight velocity will be 450 km/s (9 eV), which does not change our estimation. Coherent pulsation searc ...
... Assuming that the line-emitting matter follows the compact object that rotates around a companion with a mass of 30 M⊙ , a distance of 1013 cm, and an inclination angle of 45◦ , the maximum line-of-sight velocity will be 450 km/s (9 eV), which does not change our estimation. Coherent pulsation searc ...
Accretion mechanisms
... dynamical—timescale contributions if transferred matter cannot form a disc — occurs when mass ratio clump/BH too large ...
... dynamical—timescale contributions if transferred matter cannot form a disc — occurs when mass ratio clump/BH too large ...
Magnetic Accretion onto Neutron Stars A crucial difference between
... Ask class: on thinking about this more deeply, don’t we have a problem? The accretion rate of, say, 0.1 ṀE on a surface area only 10−3 of the star means that the local flux generated can be 100 times Eddington or more! What does that mean for this system? It means that for such accretion to persist ...
... Ask class: on thinking about this more deeply, don’t we have a problem? The accretion rate of, say, 0.1 ṀE on a surface area only 10−3 of the star means that the local flux generated can be 100 times Eddington or more! What does that mean for this system? It means that for such accretion to persist ...
Dead Stars
... more He to make O •In the Sun, this is the last nuclear process that occurs •The Sun eventually loses almost all its 4He and 1H and ends up as a burnt-out carbon/oxygen star •No longer able to produce new energy it loses heat slowly forever •It becomes a white dwarf ...
... more He to make O •In the Sun, this is the last nuclear process that occurs •The Sun eventually loses almost all its 4He and 1H and ends up as a burnt-out carbon/oxygen star •No longer able to produce new energy it loses heat slowly forever •It becomes a white dwarf ...
Astronomy Activity: The Life-Line of the Stars
... All stars are not the same distance away. Obviously, a star which is far away will appear dimmer than a similar star which is closer. We adjust for the distance of stars by giving stars an absolute brightness . The absolute magnitude of a star is ...
... All stars are not the same distance away. Obviously, a star which is far away will appear dimmer than a similar star which is closer. We adjust for the distance of stars by giving stars an absolute brightness . The absolute magnitude of a star is ...
Powerpoint
... In fact, most stars can be found somewhere along a line in this graph. Some stars are much cooler and less luminous, such calledstar the to “Main Sequence”. asThis the isclosest the Sun, Proxima Centauri. Where would you plot these? ...
... In fact, most stars can be found somewhere along a line in this graph. Some stars are much cooler and less luminous, such calledstar the to “Main Sequence”. asThis the isclosest the Sun, Proxima Centauri. Where would you plot these? ...
Object A
... Feb. 29 – Last day to drop with an automatic “W” Apr. 1 – Last day to drop a class with W, F, FA ...
... Feb. 29 – Last day to drop with an automatic “W” Apr. 1 – Last day to drop a class with W, F, FA ...
Star in a Box - Las Cumbres Observatory Global Telescope
... In fact, most stars can be found somewhere along a line in this graph. Some stars are much cooler and less luminous, such calledstar the to “Main Sequence”. asThis the isclosest the Sun, Proxima Centauri. Where would you plot these? ...
... In fact, most stars can be found somewhere along a line in this graph. Some stars are much cooler and less luminous, such calledstar the to “Main Sequence”. asThis the isclosest the Sun, Proxima Centauri. Where would you plot these? ...
The Bigger Picture
... Stellar parallax • Even the largest parallax (that for the nearest star) is small. The atmosphere blurs stellar images to about 1 arcsecond so `astrometrists’ are trying to measure a tiny motion of the centroid as it moves back and forth every six months. The lack of parallax apparent to the unaid ...
... Stellar parallax • Even the largest parallax (that for the nearest star) is small. The atmosphere blurs stellar images to about 1 arcsecond so `astrometrists’ are trying to measure a tiny motion of the centroid as it moves back and forth every six months. The lack of parallax apparent to the unaid ...
Stellar Evolution
... Even short-lived stars live too long for that Observation of stars in star clusters gives us a look at stars in all stages of evolution Allows us to construct a complete picture ...
... Even short-lived stars live too long for that Observation of stars in star clusters gives us a look at stars in all stages of evolution Allows us to construct a complete picture ...
The search for exoplanets
... of Jupiter and circuits his star in 4.2 days. From then on the discovery of many more planets followed, but none of them was earth-sized and orbiting his star in its habitable zone. On April 17th 2014 NASA’s Kepler-telescope discovered the first Earth-size planet Kepler186f in a habitable zone, whic ...
... of Jupiter and circuits his star in 4.2 days. From then on the discovery of many more planets followed, but none of them was earth-sized and orbiting his star in its habitable zone. On April 17th 2014 NASA’s Kepler-telescope discovered the first Earth-size planet Kepler186f in a habitable zone, whic ...
Constellation Chart Activity
... a) Find 6h of Right Ascension at the bottom of the map. The date written right below it is _________________. That means that if you go outside at 8 PM local time on that date, that line would be YOUR Meridian. b) Find Orion and Gemini along that 6h RA line. On that date at that time, Orion will be ...
... a) Find 6h of Right Ascension at the bottom of the map. The date written right below it is _________________. That means that if you go outside at 8 PM local time on that date, that line would be YOUR Meridian. b) Find Orion and Gemini along that 6h RA line. On that date at that time, Orion will be ...
Kepler`s Search for Exoplanets
... Here we’ve marked stars with confirmed exoplanets. There are over nearly 2000 confirmed exoplanets [update as needed], and we’re still just getting started! Results from Kepler indicate that it’s likely every star we see in the night sky has planets. And it’s just a matter of time before we find ano ...
... Here we’ve marked stars with confirmed exoplanets. There are over nearly 2000 confirmed exoplanets [update as needed], and we’re still just getting started! Results from Kepler indicate that it’s likely every star we see in the night sky has planets. And it’s just a matter of time before we find ano ...
Outside the Solar System Outside the Solar System OUTSIDE THE
... You have come 4.2 light-years from Earth. You’re arriving at Earth’s nearest star neighbor. It is Proxima Centauri, a dim, cool star. Do you see Proxima Centauri’s partner, Alpha Centauri? Up close, you can see that Alpha Centauri has two stars that are just like our Sun. On Earth, you saw constella ...
... You have come 4.2 light-years from Earth. You’re arriving at Earth’s nearest star neighbor. It is Proxima Centauri, a dim, cool star. Do you see Proxima Centauri’s partner, Alpha Centauri? Up close, you can see that Alpha Centauri has two stars that are just like our Sun. On Earth, you saw constella ...
20_LectureOutline
... All sightings recorded between about 100 BCE and 200 CE describe it as being red—it is now blue-white. Why? Could there have been an intervening dust cloud? (Then where is it?) Could its companion have been a red giant? (It became a white dwarf very quickly, then!) © 2014 Pearson Education, Inc. ...
... All sightings recorded between about 100 BCE and 200 CE describe it as being red—it is now blue-white. Why? Could there have been an intervening dust cloud? (Then where is it?) Could its companion have been a red giant? (It became a white dwarf very quickly, then!) © 2014 Pearson Education, Inc. ...
Is the central binary system of the planetary nebula Henize 2
... interestingly, in the study by Weidmann and Gamen (2011) there are several PNe that show a wide He II 5412 Å absorption line with a weak emission feature in the center of the wide absorption line. This forms a spectral structure similar to that of Henize 2–428. The most noticeable examples of this ...
... interestingly, in the study by Weidmann and Gamen (2011) there are several PNe that show a wide He II 5412 Å absorption line with a weak emission feature in the center of the wide absorption line. This forms a spectral structure similar to that of Henize 2–428. The most noticeable examples of this ...
Abstract and Summary
... White-dwarfs represent the remnant form of 95% of all stars. If it is assumed that stars retain their angular momentum throughout the evolutionary process, then white-dwarfs should rotate relatively rapidly, owing to their compact nature. However observations of photospheres show that white-dwarf st ...
... White-dwarfs represent the remnant form of 95% of all stars. If it is assumed that stars retain their angular momentum throughout the evolutionary process, then white-dwarfs should rotate relatively rapidly, owing to their compact nature. However observations of photospheres show that white-dwarf st ...
6 March 2013 Exoplanets and Where to Find Them Professor
... The Galaxy is continually evolving and changing, albeit on the astronomical timescale of millions of years. Within the disc, the spiral arms show where diffuse hydrogen gas clouds have been compressed by density waves, triggering the process of gravitational collapse that leads to the formation of s ...
... The Galaxy is continually evolving and changing, albeit on the astronomical timescale of millions of years. Within the disc, the spiral arms show where diffuse hydrogen gas clouds have been compressed by density waves, triggering the process of gravitational collapse that leads to the formation of s ...
of the Sun
... STELLIFEROUS ERA – the current era • Electrons combined with existing nuclei to form atoms, mostly hydrogen and helium • Atoms condensed into the first generation of stars during the first 200 million years • Galaxies formed • Sun, solar system formed 4.6 billion years ago • Life appeared on Earth ...
... STELLIFEROUS ERA – the current era • Electrons combined with existing nuclei to form atoms, mostly hydrogen and helium • Atoms condensed into the first generation of stars during the first 200 million years • Galaxies formed • Sun, solar system formed 4.6 billion years ago • Life appeared on Earth ...
Lyra
Lyra (/ˈlaɪərə/; Latin for lyre, from Greek λύρα) is a small constellation. It is one of 48 listed by the 2nd century astronomer Ptolemy, and is one of the 88 constellations recognized by the International Astronomical Union. Lyra was often represented on star maps as a vulture or an eagle carrying a lyre, and hence sometimes referred to as Aquila Cadens or Vultur Cadens. Beginning at the north, Lyra is bordered by Draco, Hercules, Vulpecula, and Cygnus. Lyra is visible from the northern hemisphere from spring through autumn, and nearly overhead, in temperate latitudes, during the summer months. From the southern hemisphere, it is visible low in the northern sky during the winter months.The lucida or brightest star—and one of the brightest stars in the sky—is the white main sequence star Vega, a corner of the Summer Triangle. Beta Lyrae is the prototype of a class of stars known as Beta Lyrae variables, binary stars so close to each other that they become egg-shaped and material flows from one to the other. Epsilon Lyrae, known informally as the Double Double, is a complex multiple star system. Lyra also hosts the Ring Nebula, the second-discovered and best-known planetary nebula.