Dear Leif - LEIF.org
... gained the experience from doing that, they appear to have used interchange arguments to guide subsequent analysis of new systems that are 'close' to those that they had analysed previously and understood. In this regard I acknowledge that Wolff and Patrone on p231 appear to claim that their perturb ...
... gained the experience from doing that, they appear to have used interchange arguments to guide subsequent analysis of new systems that are 'close' to those that they had analysed previously and understood. In this regard I acknowledge that Wolff and Patrone on p231 appear to claim that their perturb ...
PowerPoint Presentation - 16. Properties of Stars
... • A star’s most important property is its mass, which determines its luminosity and spectral type at each stage of its life. • What are the three major classes of binary star systems? • A visual binary is a pair of orbiting stars that we can see distinctly. An eclipsing binary reveals its binary nat ...
... • A star’s most important property is its mass, which determines its luminosity and spectral type at each stage of its life. • What are the three major classes of binary star systems? • A visual binary is a pair of orbiting stars that we can see distinctly. An eclipsing binary reveals its binary nat ...
Astronomy Part 1 - Malvern Troop 7
... a) Identify in the sky at least 10 constellations, at least four of which are in the zodiac. b) Identify at least eight conspicuous stars, five of which are of magnitude 1 or brighter. c) Make two sketches of the Big Dipper. In one sketch, show the Big Dipper's orientation in the early evening sky. ...
... a) Identify in the sky at least 10 constellations, at least four of which are in the zodiac. b) Identify at least eight conspicuous stars, five of which are of magnitude 1 or brighter. c) Make two sketches of the Big Dipper. In one sketch, show the Big Dipper's orientation in the early evening sky. ...
High-Speed Ballistic Stellar Interlopers
... stars produced much larger bow shocks than the stars in the Hubble study, suggesting that they are more massive stars with more powerful stellar winds. The stars in this Hubble study are likely the lower-mass and/or lower-speed counterparts to the massive stars with bow shocks detected by IRAS. The ...
... stars produced much larger bow shocks than the stars in the Hubble study, suggesting that they are more massive stars with more powerful stellar winds. The stars in this Hubble study are likely the lower-mass and/or lower-speed counterparts to the massive stars with bow shocks detected by IRAS. The ...
Kepler-452b is not a new Earth A twin of the Sun
... Best evidence of first generation stars in the universe Astronomers have long theorised the existence of a first generation of stars — known as Population III stars — that were born out of the primordial material from the Big Bang. The name Population III arose because astronomers had already classe ...
... Best evidence of first generation stars in the universe Astronomers have long theorised the existence of a first generation of stars — known as Population III stars — that were born out of the primordial material from the Big Bang. The name Population III arose because astronomers had already classe ...
HR Diagram Explorer
... An actual HR Diagram is provided in the upper right panel with an active location indicated by a red x. This active location can be dragged around the diagram. The options panel allows you control the variables plotted on the x-axis: (temperature, B-V, or spectral type) and those plotted on the y-ax ...
... An actual HR Diagram is provided in the upper right panel with an active location indicated by a red x. This active location can be dragged around the diagram. The options panel allows you control the variables plotted on the x-axis: (temperature, B-V, or spectral type) and those plotted on the y-ax ...
A-level Physics A Question paper Unit 5/W - Astrophysics
... for the Quality of Written Communication. ! The marks for questions are shown in brackets. ! A Data Sheet is provided on pages 3 and 4. You may wish to detach this perforated sheet at the start of the examination. ! You are expected to use a calculator where appropriate. ! You are reminded of the ne ...
... for the Quality of Written Communication. ! The marks for questions are shown in brackets. ! A Data Sheet is provided on pages 3 and 4. You may wish to detach this perforated sheet at the start of the examination. ! You are expected to use a calculator where appropriate. ! You are reminded of the ne ...
Dark Matter -24-------------------------------~-----------R-E-S-O-N-A-N-C
... the stars are all there is to a galaxy. (ii) Dark matter exists, but consists entirely of ord~nary matter - Jupiter-like objects called broum dwarfs that are not massive enough to start the stellar energy-generating process of nuclear fusion that makes them visible. (iii) Dark matter not only exists ...
... the stars are all there is to a galaxy. (ii) Dark matter exists, but consists entirely of ord~nary matter - Jupiter-like objects called broum dwarfs that are not massive enough to start the stellar energy-generating process of nuclear fusion that makes them visible. (iii) Dark matter not only exists ...
Herbig Ae/Be Stars
... A reliable understanding of pre-main sequence evolution would reveal many details of star formation • What is the star formation history? + How long does star formation last? + Which stars form first? + What is the relation between young stars in adjacent ...
... A reliable understanding of pre-main sequence evolution would reveal many details of star formation • What is the star formation history? + How long does star formation last? + Which stars form first? + What is the relation between young stars in adjacent ...
PPT presentation
... A survey for PNs in this elliptical galaxy produced 535 detections (Mendez et al. 2001, ApJ, 563, 135). In addition, some 20 objects of different kinds were found, namely: • Many extended sources, presumably star formation regions at low redshift. Those pose no confusion problem because of their ext ...
... A survey for PNs in this elliptical galaxy produced 535 detections (Mendez et al. 2001, ApJ, 563, 135). In addition, some 20 objects of different kinds were found, namely: • Many extended sources, presumably star formation regions at low redshift. Those pose no confusion problem because of their ext ...
Gemini - Sochias
... 40-200 AU separation Second epoch observations of 48 stars confirm all candidates as unrelated background stars 95% upper limit of fractions of star with at least one planet of 0.5 - 13 MJup are – 0.28 for 10-25 AU – 0.13 for 25-50 AU ...
... 40-200 AU separation Second epoch observations of 48 stars confirm all candidates as unrelated background stars 95% upper limit of fractions of star with at least one planet of 0.5 - 13 MJup are – 0.28 for 10-25 AU – 0.13 for 25-50 AU ...
Слайд 1 - Tuorla Observatory
... parameters are more accurate than for single star • (b) All stars are of the same age. Star clusters are the only objects that enable direct age estimate, study of the galactic evolution and the star-formation history • (c) All stars have nearly the same chemical composition, and the differences in ...
... parameters are more accurate than for single star • (b) All stars are of the same age. Star clusters are the only objects that enable direct age estimate, study of the galactic evolution and the star-formation history • (c) All stars have nearly the same chemical composition, and the differences in ...
スライド 1 - STScI
... Figure 2 is the I-K vs. K color-magnitude diagram of variable stars in the LMC. Relevant data is taken from Ita et al. (2004). The horizontal line shows the 10 sigma detection limit for our monitoring survey at K band, which is about 15.5 magnitude. The right diagonal line stands for the 10 sigma de ...
... Figure 2 is the I-K vs. K color-magnitude diagram of variable stars in the LMC. Relevant data is taken from Ita et al. (2004). The horizontal line shows the 10 sigma detection limit for our monitoring survey at K band, which is about 15.5 magnitude. The right diagonal line stands for the 10 sigma de ...
Section 4 Formation of the Universe Chapter 19
... life cycle as a ball of gas and dust. Gravity pulls the gas and dust together, and hydrogen changes to helium in a processes called nuclear fusion. • The End Stars usually lose material slowly, but sometimes they can lose material in a big explosion. Much of a star’s material returns to space, where ...
... life cycle as a ball of gas and dust. Gravity pulls the gas and dust together, and hydrogen changes to helium in a processes called nuclear fusion. • The End Stars usually lose material slowly, but sometimes they can lose material in a big explosion. Much of a star’s material returns to space, where ...
Document
... changes. From an observed line profile, one can construct an image of the surface of the star. This technique has been applied to many different types of stars. ...
... changes. From an observed line profile, one can construct an image of the surface of the star. This technique has been applied to many different types of stars. ...
LAB #5 - GEOCITIES.ws
... In the course of the Harvard classification study, some of the old spectral types were consolidated together, and the types were re-arranged to reflect a steady change in the strengths of representative spectral lines. The order of the spectral classes became O, B, A, F, G, K, and M, and though the ...
... In the course of the Harvard classification study, some of the old spectral types were consolidated together, and the types were re-arranged to reflect a steady change in the strengths of representative spectral lines. The order of the spectral classes became O, B, A, F, G, K, and M, and though the ...
Chapter 30: Stars
... Solar Activity Cycle Astronomers have observed that the number of sunspots changes regularly and on average, reaches a maximum number every 11.2 years on average. Scientists therefore hypothesized that the solar activity cycle is 11.2 years in length. However, when the polarity of the Sun’s magnetic ...
... Solar Activity Cycle Astronomers have observed that the number of sunspots changes regularly and on average, reaches a maximum number every 11.2 years on average. Scientists therefore hypothesized that the solar activity cycle is 11.2 years in length. However, when the polarity of the Sun’s magnetic ...
PPT
... • Monitoring of hundreds of thousands of stars to 200 pc for 1MJ planets with P < 10 years: – complete census of all stellar types (P=2-9 years) – actual masses, not just lower limits (m sin i) – 20,000-30,000 planets expected to 150-200 pc ...
... • Monitoring of hundreds of thousands of stars to 200 pc for 1MJ planets with P < 10 years: – complete census of all stellar types (P=2-9 years) – actual masses, not just lower limits (m sin i) – 20,000-30,000 planets expected to 150-200 pc ...
Young Stars in AGN
... Young starbursts, intermediate age and old populations appear in significant and mixed proportions. WR features were discovered in the pure emission (absorption subtracted) spectra of 5/65 galaxies (dating much more precise) for young component. 17 known to have BLR (direct or polarized) show also ...
... Young starbursts, intermediate age and old populations appear in significant and mixed proportions. WR features were discovered in the pure emission (absorption subtracted) spectra of 5/65 galaxies (dating much more precise) for young component. 17 known to have BLR (direct or polarized) show also ...
Oscillating White Dwarf Stars Background on White Dwarfs
... temperatures of 100.000.000 K. 8Be is unstable and decays back into He in 2.6 × 10–16 secs, but in the stellar interior a small equilibrium of 8Be exists. The 8Be ground state has almost exactly the energy of two alpha particles. In the second step, 8Be + 4He has almost exactly the energy of an exci ...
... temperatures of 100.000.000 K. 8Be is unstable and decays back into He in 2.6 × 10–16 secs, but in the stellar interior a small equilibrium of 8Be exists. The 8Be ground state has almost exactly the energy of two alpha particles. In the second step, 8Be + 4He has almost exactly the energy of an exci ...
Lecture 4: Telescopes Web site Stuff from last time Naked eye and magnitudes
... How can you tell if a star is circumpolar from your location? Why do we have time zones? How can you use the stars to get your latitude and longitude? ...
... How can you tell if a star is circumpolar from your location? Why do we have time zones? How can you use the stars to get your latitude and longitude? ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.