Hertzsprung-Russell Diagrams
... Hertzsprung - Russell Diagram The Hertzsprung -Russell (H-R) Diagram is a graph that plots stars color (spectral type or surface temperature) vs. its luminosity (intrinsic brightness or absolute magnitude). On it, astronomers plot stars' color, temperature, luminosity, spectral type, and evolutiona ...
... Hertzsprung - Russell Diagram The Hertzsprung -Russell (H-R) Diagram is a graph that plots stars color (spectral type or surface temperature) vs. its luminosity (intrinsic brightness or absolute magnitude). On it, astronomers plot stars' color, temperature, luminosity, spectral type, and evolutiona ...
File - Mr. Catt`s Class
... 7. Because of degeneracy, the core cannot cool by expanding and thus helium fusion reactions occur faster and faster. – Helium flash is the process of runaway helium fusion reactions that occurs during the evolution of a red giant. ...
... 7. Because of degeneracy, the core cannot cool by expanding and thus helium fusion reactions occur faster and faster. – Helium flash is the process of runaway helium fusion reactions that occurs during the evolution of a red giant. ...
Stellar Evolution: the Death of Stars
... • AGB star is also called Carbon Star • AGB star has strong stellar wind, losing mass at very high rate • AGB star enriches interstellar medium with carbon, and some oxygen and nitrogen • Most of carbons in our body are likely from earlygeneration AGB stars nearby ...
... • AGB star is also called Carbon Star • AGB star has strong stellar wind, losing mass at very high rate • AGB star enriches interstellar medium with carbon, and some oxygen and nitrogen • Most of carbons in our body are likely from earlygeneration AGB stars nearby ...
Variable star information
... fainter than Cepheid variables; they are older, more evolved stars that have left the mainsequence phase of stellar evolution and are burning helium in their cores. Rotating variable stars Another class of variable stars owe their change in brightness to their irregular shape and/or to their non-uni ...
... fainter than Cepheid variables; they are older, more evolved stars that have left the mainsequence phase of stellar evolution and are burning helium in their cores. Rotating variable stars Another class of variable stars owe their change in brightness to their irregular shape and/or to their non-uni ...
Lecture 8: The Stars - Department of Physics and Astronomy
... Stars are often found in clusters: • Open clusters with thousands of stars • Globular clusters with millions of stars The age of a cluster can be measured with an HR diagram. • Open clusters are often “young” (100 million years) • Globular clusters are always old (13 billion years) ...
... Stars are often found in clusters: • Open clusters with thousands of stars • Globular clusters with millions of stars The age of a cluster can be measured with an HR diagram. • Open clusters are often “young” (100 million years) • Globular clusters are always old (13 billion years) ...
ASTR-1020: Astronomy II Course Lecture Notes - Faculty
... e) Population I star Cepheids (called Type I or classical Cepheids) have a slightly different period-luminosity relationship than the Population II star cepheids (called Type II Cepheids or W Virginis stars). 3. Lower mass versions of Cepheids exist called RR Lyrae type variables, which change in br ...
... e) Population I star Cepheids (called Type I or classical Cepheids) have a slightly different period-luminosity relationship than the Population II star cepheids (called Type II Cepheids or W Virginis stars). 3. Lower mass versions of Cepheids exist called RR Lyrae type variables, which change in br ...
File
... A relatively nearby supernova might appear as bright as the full moon, and be visible night and day. Since studies in other large galaxies show that supernovae erupt every 30 to 50 years on the average, we appear to be due, although a few supernovae have probably occurred in distant, obscured parts ...
... A relatively nearby supernova might appear as bright as the full moon, and be visible night and day. Since studies in other large galaxies show that supernovae erupt every 30 to 50 years on the average, we appear to be due, although a few supernovae have probably occurred in distant, obscured parts ...
OUR COSMIC NEIGHBORS Story of the Stars
... HIS LITTLE BOOK is for those men, women, and children who desire to become better acquainted with the stars of the night. While our information is factual and the charts are accurate, no attempt has been made to delineate the technical phases of celestial mechanicsOur efforts have been devoted to de ...
... HIS LITTLE BOOK is for those men, women, and children who desire to become better acquainted with the stars of the night. While our information is factual and the charts are accurate, no attempt has been made to delineate the technical phases of celestial mechanicsOur efforts have been devoted to de ...
Nearby Stars - How far away is it
... Getting back to nearby stars, here‘s Wolf 359. It is another dim red star. In fact, it‘s one of the least luminous stars known. Star Trek fans may recognize Wolf 359 as the scene of a great battle between the Federation and The Borg. Lalande 21185 - 8.32 light years Lalande 21185 is another dime red ...
... Getting back to nearby stars, here‘s Wolf 359. It is another dim red star. In fact, it‘s one of the least luminous stars known. Star Trek fans may recognize Wolf 359 as the scene of a great battle between the Federation and The Borg. Lalande 21185 - 8.32 light years Lalande 21185 is another dime red ...
Star Formation
... • Emission Nebula as stars form and shine on hydrogen gas • To Dust Reflection Nebula as hydrogen and other gas blown away early on by stellar winds • To Open Star Cluster with no gas or dust left over • To Stellar Association as cluster stars drift apart • To individual stars scattered widely and n ...
... • Emission Nebula as stars form and shine on hydrogen gas • To Dust Reflection Nebula as hydrogen and other gas blown away early on by stellar winds • To Open Star Cluster with no gas or dust left over • To Stellar Association as cluster stars drift apart • To individual stars scattered widely and n ...
THE HR DIAGRAM
... class and temperature while at the bottom, the x‐axis uses the B‐V color index. The y‐axis on the left uses luminosity in solar units while absolute magnitudes are at right. This is a plot of 22,000 stars from the Hipparcos Catalogue together with 1,000 low‐luminosity stars (red and white dwarfs ...
... class and temperature while at the bottom, the x‐axis uses the B‐V color index. The y‐axis on the left uses luminosity in solar units while absolute magnitudes are at right. This is a plot of 22,000 stars from the Hipparcos Catalogue together with 1,000 low‐luminosity stars (red and white dwarfs ...
THE SPECTRA OF FIVE IRREGULAR VARIABLE STARS George H
... 3. V567 Sagittarii.—This object was discovered by Miss Henrietta Swope,4 who stated : "The spectrum is given as Pd in Harvard Circular 231, where it is called a gaseous nebula. . . . The variation is real and apparently irregular with no distinctive character.,, This object has also been observed by ...
... 3. V567 Sagittarii.—This object was discovered by Miss Henrietta Swope,4 who stated : "The spectrum is given as Pd in Harvard Circular 231, where it is called a gaseous nebula. . . . The variation is real and apparently irregular with no distinctive character.,, This object has also been observed by ...
29-4 - Fremont Peak Observatory
... been Secretary, Treasurer and President before retiring from the FPOA Board at the end of 2012. Rick has also been the principal liaison between State Parks and the FPOA during his tenure as resident ranger at the Peak and as a member of the board. No one could hope to equal the decades of service a ...
... been Secretary, Treasurer and President before retiring from the FPOA Board at the end of 2012. Rick has also been the principal liaison between State Parks and the FPOA during his tenure as resident ranger at the Peak and as a member of the board. No one could hope to equal the decades of service a ...
Ch. 20
... The Hyades cluster, shown here, is also rather young; its main-sequence turnoff indicates an age of about 600 million years. ...
... The Hyades cluster, shown here, is also rather young; its main-sequence turnoff indicates an age of about 600 million years. ...
Star - Astrophysics
... (nuclear forces between the neutrons complicate the situation), but measured masses are all close to 1.4M. Given the density of nuclear material, radii should be in the range 10–17 km. The luminosity is therefore very small making neutron stars hard to detect. However, in 1967 Jocelyn Bell and Tony ...
... (nuclear forces between the neutrons complicate the situation), but measured masses are all close to 1.4M. Given the density of nuclear material, radii should be in the range 10–17 km. The luminosity is therefore very small making neutron stars hard to detect. However, in 1967 Jocelyn Bell and Tony ...
Auriga (constellation)
Auriga is one of the 48 constellations listed by the 2nd-century astronomer Ptolemy and remains one of the 88 modern constellations. Located north of the celestial equator, its name is the Latin word for ""charioteer"", associating it with various mythological charioteers, including Erichthonius and Myrtilus. Auriga is most prominent during winter evenings in the Northern Hemisphere, along with the five other constellations that have stars in the Winter Hexagon asterism. Because of its northern declination, Auriga is only visible in its entirety as far as 34° south; for observers farther south it lies partially or fully below the horizon. A large constellation, with an area of 657 square degrees, it is half the size of the largest constellation, Hydra.Its brightest star, Capella, is an unusual multiple star system among the brightest stars in the night sky. Beta Aurigae is an interesting variable star in the constellation; Epsilon Aurigae, a nearby eclipsing binary with an unusually long period, has been studied intensively. Because of its position near the winter Milky Way, Auriga has many bright open clusters in its borders, including M36, M37, and M38, popular targets for amateur astronomers. In addition, it has one prominent nebula, the Flaming Star Nebula, associated with the variable star AE Aurigae.In Chinese mythology, Auriga's stars were incorporated into several constellations, including the celestial emperors' chariots, made up of the modern constellation's brightest stars. Auriga is home to the radiant for the Aurigids, Zeta Aurigids, Delta Aurigids, and the hypothesized Iota Aurigids.