Betelgeuse: an unauthorized biography
... (i.e. main sequence) mass 15+2 –5 M, the 15 M corresponding (with mass loss rates from Schaller et al.) to about 13.7 M now. This mass, combined with a radius of 780, 700 or 640 R implies a surface gravity of log g = –0.20, –0.11 and –0.04 respectively, very much in line with the value 0.0 (with ...
... (i.e. main sequence) mass 15+2 –5 M, the 15 M corresponding (with mass loss rates from Schaller et al.) to about 13.7 M now. This mass, combined with a radius of 780, 700 or 640 R implies a surface gravity of log g = –0.20, –0.11 and –0.04 respectively, very much in line with the value 0.0 (with ...
Basic principles of celestial navigation
... can be specified by the plane angle in the equatorial plane whose vertex is at O with one radial line through the point at which the meridian through P intersects the equatorial plane and the other radial line through the point G at which the prime meridian intersects the equatorial plane !see Fig. ...
... can be specified by the plane angle in the equatorial plane whose vertex is at O with one radial line through the point at which the meridian through P intersects the equatorial plane and the other radial line through the point G at which the prime meridian intersects the equatorial plane !see Fig. ...
STAR ANALYSER 100 USER MANUAL PATON HAWKSLEY EDUCATION LTD
... It is the science of recording and analysing electromagnetic radiation (eg light) in terms of its wavelength (colour). 2 Why is Spectroscopy so important in Astronomy? Astronomy is rather unusual among the sciences in that it is almost entirely observational rather than experimental. With the rare e ...
... It is the science of recording and analysing electromagnetic radiation (eg light) in terms of its wavelength (colour). 2 Why is Spectroscopy so important in Astronomy? Astronomy is rather unusual among the sciences in that it is almost entirely observational rather than experimental. With the rare e ...
the Colours of rainbow the Brook
... through woods and valleys. The brook narrates the story of its musical journey along these places. Imagery of sight and sound are blended in the poem by employing exquisite words and expressions. Summary:“The brook” has been written by “Alfred Tennyson”. The poem traces the life of a brook or small ...
... through woods and valleys. The brook narrates the story of its musical journey along these places. Imagery of sight and sound are blended in the poem by employing exquisite words and expressions. Summary:“The brook” has been written by “Alfred Tennyson”. The poem traces the life of a brook or small ...
WORD - Astrophysics
... Stars have focused the interest of astronomers for centuries. A great variety of observations have driven our knowledge of the processes leading to star formation, of how the interplay between gravity and nuclear reactions determine stellar evolution, and ultimately, the physical principles that exp ...
... Stars have focused the interest of astronomers for centuries. A great variety of observations have driven our knowledge of the processes leading to star formation, of how the interplay between gravity and nuclear reactions determine stellar evolution, and ultimately, the physical principles that exp ...
Evolution of stars
... b. upper left corner c. upper right corner d. lower left corner e. lower right corner 6. In the H-R diagram, 90 percent of all stars are a. in the giant region. b. in the supergiant region. c. among the B stars. d. among the G stars. e. on the main sequence. 7. We know that giant stars are larger in ...
... b. upper left corner c. upper right corner d. lower left corner e. lower right corner 6. In the H-R diagram, 90 percent of all stars are a. in the giant region. b. in the supergiant region. c. among the B stars. d. among the G stars. e. on the main sequence. 7. We know that giant stars are larger in ...
Astronomy 250 - University of Victoria
... show one calculation and then put the other results in a table. RESULTS The result of a lab is often a number. You must remember to quote an uncertainty for your result. You must also remember to quote the units (kilometers, light years, etc.). QUESTIONS Usually there are a few questions at the end ...
... show one calculation and then put the other results in a table. RESULTS The result of a lab is often a number. You must remember to quote an uncertainty for your result. You must also remember to quote the units (kilometers, light years, etc.). QUESTIONS Usually there are a few questions at the end ...
1: Properties of Pulsars
... dwarfs. Only neutron stars were left as a possible explanation. Periods for radial oscillations of neutron stars were predicted to be larger than 1 second and were hence incompatible with the periods of the first discovered pulsars. Finally, another property of pulsars, also most easily observed in ...
... dwarfs. Only neutron stars were left as a possible explanation. Periods for radial oscillations of neutron stars were predicted to be larger than 1 second and were hence incompatible with the periods of the first discovered pulsars. Finally, another property of pulsars, also most easily observed in ...
The Age and Progenitor Mass of Sirius B
... The Sirius system is the fifth or sixth nearest stellar system to the Sun1 , and certainly is one of the best studied binary systems including a white dwarf component. One does not want to employ a white dwarf in a binary close enough that interactions might have affected the mass loss phases in the ...
... The Sirius system is the fifth or sixth nearest stellar system to the Sun1 , and certainly is one of the best studied binary systems including a white dwarf component. One does not want to employ a white dwarf in a binary close enough that interactions might have affected the mass loss phases in the ...
Chemical Evolution
... Predictions for disk galaxies: Extended disks form late, after most merging complete, or redshift ~ unity (~8Gyr ago) (mass-dependent, 1012M) Hundreds of satellite dark haloes Stellar halo formed from disrupted satellites Minor mergers (< 20% mass of disk ) heat thin disk, create thick dis ...
... Predictions for disk galaxies: Extended disks form late, after most merging complete, or redshift ~ unity (~8Gyr ago) (mass-dependent, 1012M) Hundreds of satellite dark haloes Stellar halo formed from disrupted satellites Minor mergers (< 20% mass of disk ) heat thin disk, create thick dis ...
ULXs: General Properties and Variability - X
... sense from galactic objects • luminosities can reach 1000 Ledd for 1 solar mass object •evidence against beaming (QPOs, broad Fe Lines, eclipses) •At least one object has a break in the PDS at the frequency predicted for M~1000M objects •Associated extended radio sources •General lack of optical Ids ...
... sense from galactic objects • luminosities can reach 1000 Ledd for 1 solar mass object •evidence against beaming (QPOs, broad Fe Lines, eclipses) •At least one object has a break in the PDS at the frequency predicted for M~1000M objects •Associated extended radio sources •General lack of optical Ids ...
3.2 Black body Radiation
... Almost all astronomical information from beyond the Solar System comes to us from some form of electromagnetic radiation (EMR). (Can you think of any sources of information from beyond the Solar system that do not involve EMR in some form?) We can now detect and study EMR over a range of wavelength ...
... Almost all astronomical information from beyond the Solar System comes to us from some form of electromagnetic radiation (EMR). (Can you think of any sources of information from beyond the Solar system that do not involve EMR in some form?) We can now detect and study EMR over a range of wavelength ...
The Milky Way
... Galaxies in a cluster have more erratic velocities than we expect from the amount of matter we can “see” in the cluster ...
... Galaxies in a cluster have more erratic velocities than we expect from the amount of matter we can “see” in the cluster ...
Searching for the oldest, most metal-poor stars in the SkyMapper Survey
... 1. Normalize the spectra. The processed and reduced echelle spectra from the MagellanClay telescope for each star are high-resolution (0.7” slit R = λ/∆λ ∼ 30, 000 and 1.0” slit R ∼ 35, 000) line spectra. Each spectrum possess ∼ 30 orders, which are small pieces of the spectrum. The wavelength rang ...
... 1. Normalize the spectra. The processed and reduced echelle spectra from the MagellanClay telescope for each star are high-resolution (0.7” slit R = λ/∆λ ∼ 30, 000 and 1.0” slit R ∼ 35, 000) line spectra. Each spectrum possess ∼ 30 orders, which are small pieces of the spectrum. The wavelength rang ...
Comparing stars - The Open University
... than the Sun, and appears bluish-white. It has the greatest apparent visual brightness (most negative apparent visual magnitude!) of any star in the night sky. This is, as we have seen, not because it is very luminous, but because it is both fairly luminous and rather close - at 2.63 pc it's the sev ...
... than the Sun, and appears bluish-white. It has the greatest apparent visual brightness (most negative apparent visual magnitude!) of any star in the night sky. This is, as we have seen, not because it is very luminous, but because it is both fairly luminous and rather close - at 2.63 pc it's the sev ...
January 2014 Astronomy Calendar by Dave Mitsky Some
... The dwarf planet Pluto is in conjunction with the Sun on January 1st. For more on the planets and how to locate them, browse http://www.nakedeyeplanets.com/ Asteroid 7 Iris shines at tenth magnitude as it travels northeastward through Pisces this month. It passes through the southern portion of the ...
... The dwarf planet Pluto is in conjunction with the Sun on January 1st. For more on the planets and how to locate them, browse http://www.nakedeyeplanets.com/ Asteroid 7 Iris shines at tenth magnitude as it travels northeastward through Pisces this month. It passes through the southern portion of the ...
PHY 375 - DePaul University
... The strategy in this derivation is to invert the situation. That is, instead of considering a ray of light (hence a point) moving along and striking a star surface of radius R⋆ , think instead of the light as a circular surface of radius R⋆ and the star as a point. In other words, the light moves al ...
... The strategy in this derivation is to invert the situation. That is, instead of considering a ray of light (hence a point) moving along and striking a star surface of radius R⋆ , think instead of the light as a circular surface of radius R⋆ and the star as a point. In other words, the light moves al ...
What Are the Faint X-ray Transients Near the Galactic Center?
... Another LMXB (0.1 pc from Sgr A*) with Periodic Eclipses ...
... Another LMXB (0.1 pc from Sgr A*) with Periodic Eclipses ...
A Bayesian method for the detection of planetary transits
... the Zodiacal light. This last one gives a dominant contribution which is of the order of 300 e− /30 s/pix in our case. In consequence, the magnitude of the stars which can be monitored with sufficient photometric accuracy ranges from 12 to 16. The minimum sampling available for the data is imposed b ...
... the Zodiacal light. This last one gives a dominant contribution which is of the order of 300 e− /30 s/pix in our case. In consequence, the magnitude of the stars which can be monitored with sufficient photometric accuracy ranges from 12 to 16. The minimum sampling available for the data is imposed b ...
6.1 Introduction
... A further example is provided by the relative element ratios in the atmospheres of stars that have evolved off the main sequence. In some cases, material deep in the stellar core is ‘dredged up’ to the surface. The composition of this gas can be quite different from that of the interstellar cloud fr ...
... A further example is provided by the relative element ratios in the atmospheres of stars that have evolved off the main sequence. In some cases, material deep in the stellar core is ‘dredged up’ to the surface. The composition of this gas can be quite different from that of the interstellar cloud fr ...
Astronomy Chapter 17 – Galaxies A. Main Ideas 1. Discovering
... use the method of standard candles to measure the distance to distant galaxies. Using the inverse-square law and the known luminosity of Cepheid variables scientists are able to reasonable measurements of the distances involved. • Redshift and the Hubble Law ⇒ In the 1920s, astronomers discovered th ...
... use the method of standard candles to measure the distance to distant galaxies. Using the inverse-square law and the known luminosity of Cepheid variables scientists are able to reasonable measurements of the distances involved. • Redshift and the Hubble Law ⇒ In the 1920s, astronomers discovered th ...
Seeds of a Tychonic Revolution: Telescopic Observations of the
... observationally equivalent as regards the sun, moon, and planets. Mareo can obtain the data needed to decide between these two systems only by observing the stars. For example, if Mareo detects annual stellar parallax, that would support the Copernican world system. Consider what Mareo will see when ...
... observationally equivalent as regards the sun, moon, and planets. Mareo can obtain the data needed to decide between these two systems only by observing the stars. For example, if Mareo detects annual stellar parallax, that would support the Copernican world system. Consider what Mareo will see when ...
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.