Introduction and first data set
... Southern hemisphere Zog astronomers see the equally brilliant southern blue spot. ...
... Southern hemisphere Zog astronomers see the equally brilliant southern blue spot. ...
stars-notes
... Composition of Stars, continued • A continuous spectrum shows all of the colors, while an absorption spectrum shows which wavelengths of light are absorbed. • The spectrum of a star is an absorption spectrum because the atmosphere of the star absorbs certain portions of the light produced by the sta ...
... Composition of Stars, continued • A continuous spectrum shows all of the colors, while an absorption spectrum shows which wavelengths of light are absorbed. • The spectrum of a star is an absorption spectrum because the atmosphere of the star absorbs certain portions of the light produced by the sta ...
Variable Stars: Pulsation, Evolution and applications to Cosmology
... Recall equations of stellar structure. Nuclear energy generation rate ε(ρ,T) slowly changes the composition decreasing the amount of Hydrogen and increasing the amount of Helium on a nuclear time scale – the characteristic time for stellar properties to change as a result of nuclear burning: tnuc ~ ...
... Recall equations of stellar structure. Nuclear energy generation rate ε(ρ,T) slowly changes the composition decreasing the amount of Hydrogen and increasing the amount of Helium on a nuclear time scale – the characteristic time for stellar properties to change as a result of nuclear burning: tnuc ~ ...
Luminosity Classes
... The period of the change determine the type: Long Period Variables have a period of 100s of days. They are usually Giant stars. Cepheid Variables have a period of 1 to 100 days. Their period is related to their luminosity so they make good “Standard Candles” and are used to find stellar distances… P ...
... The period of the change determine the type: Long Period Variables have a period of 100s of days. They are usually Giant stars. Cepheid Variables have a period of 1 to 100 days. Their period is related to their luminosity so they make good “Standard Candles” and are used to find stellar distances… P ...
Stars: Their Life and Afterlife
... having been born in the same giant molecular cloud. Each star is born with a small velocity in a random direction; in an association, these velocities are typically d 3 km/s – a fairly small velocity dispersion. OB associations have a lifetime of ~ 20 million years, the amount of time it takes for t ...
... having been born in the same giant molecular cloud. Each star is born with a small velocity in a random direction; in an association, these velocities are typically d 3 km/s – a fairly small velocity dispersion. OB associations have a lifetime of ~ 20 million years, the amount of time it takes for t ...
STAR FORMATION (Ch. 19) - University of Texas Astronomy Home
... This single view nicely illustrates the entire stellar life cycle of stars, starting with the Bok globules (dark clouds) and giant gaseous pillars (emission nebulae), followed by circumstellar disks, and progressing to evolved massive stars in the young starburst cluster.To the upper right of cente ...
... This single view nicely illustrates the entire stellar life cycle of stars, starting with the Bok globules (dark clouds) and giant gaseous pillars (emission nebulae), followed by circumstellar disks, and progressing to evolved massive stars in the young starburst cluster.To the upper right of cente ...
`astronomy` or `astrology`: a brief history of an apparent confusion
... Ptolemy has a special place in history, as for a millennium he remained the authority on astronomy, and for even longer on astrology. His achievement appears to be not so much a novelty as a reconfiguration. Instead of the dilemma describing/explaining his work brings to the front knowledge in the f ...
... Ptolemy has a special place in history, as for a millennium he remained the authority on astronomy, and for even longer on astrology. His achievement appears to be not so much a novelty as a reconfiguration. Instead of the dilemma describing/explaining his work brings to the front knowledge in the f ...
Navigating the Night Sky – Teacher Guide Argos Online Subject
... • Identify features of the star map: o How are constellations labeled? - All capital letters o How are stars labeled? -Lowercase (except first letter) o What do the symbols mean? -Open clusters, globular clusters, galaxies, etc…(see legend) o Why are the stars different sizes on the map? -Different ...
... • Identify features of the star map: o How are constellations labeled? - All capital letters o How are stars labeled? -Lowercase (except first letter) o What do the symbols mean? -Open clusters, globular clusters, galaxies, etc…(see legend) o Why are the stars different sizes on the map? -Different ...
Props for Kinesthetic Astronomy
... INSTRUCTIONS for ASSEMBLY and SET-UP of the ZODIAC SIGNS The Zodiac signs are not absolutely required for the Kinesthestic Astronomy lessons. You may use other objects in the learning environment to represent the stars. Field testing has shown the value of the signs. CONSTRUCTION OF SIGNS: Print th ...
... INSTRUCTIONS for ASSEMBLY and SET-UP of the ZODIAC SIGNS The Zodiac signs are not absolutely required for the Kinesthestic Astronomy lessons. You may use other objects in the learning environment to represent the stars. Field testing has shown the value of the signs. CONSTRUCTION OF SIGNS: Print th ...
The Milky Way - Midlandstech
... Comparing absolute and apparent magnitudes of Cepheids, we can measure their distances (using the 1/d2 law)! The Cepheid distance measurements were the first distance determinations that worked out to distances beyond our Milky Way! Cepheids are up to ~ 40,000 times more luminous than our sun => can ...
... Comparing absolute and apparent magnitudes of Cepheids, we can measure their distances (using the 1/d2 law)! The Cepheid distance measurements were the first distance determinations that worked out to distances beyond our Milky Way! Cepheids are up to ~ 40,000 times more luminous than our sun => can ...
The Milky Way - 清華大學物理系歡迎頁 Welcome to
... Comparing absolute and apparent magnitudes of Cepheids, we can measure their distances (using the 1/d2 law)! The Cepheid distance measurements were the first distance determinations that worked out to distances beyond our Milky Way! Cepheids are up to ~ 40,000 times more luminous than our sun => can ...
... Comparing absolute and apparent magnitudes of Cepheids, we can measure their distances (using the 1/d2 law)! The Cepheid distance measurements were the first distance determinations that worked out to distances beyond our Milky Way! Cepheids are up to ~ 40,000 times more luminous than our sun => can ...
PHYS_3380_100714_bw - The University of Texas at Dallas
... – the wavefronts, when reflected, are restored to their original state. ...
... – the wavefronts, when reflected, are restored to their original state. ...
Astronomers Find Extremely Large Planet
... young forming stars. The fact that the FLAMINGOS survey only found silhouette disks in clusters and not peppered thoughout the immense volume of the molecular clouds supports the point of view that such clusters of stars are the birthplace for most of the stars in our galaxy. “It’s surprising that t ...
... young forming stars. The fact that the FLAMINGOS survey only found silhouette disks in clusters and not peppered thoughout the immense volume of the molecular clouds supports the point of view that such clusters of stars are the birthplace for most of the stars in our galaxy. “It’s surprising that t ...
Chapter 5 Radiation and Spectra - High Energy Physics at Wayne
... The Nature of Light At least 95% of the celestial information we receive is in the form of light. Astronomers have devised many techniques to decode as much of the encoded information as possible from the small amount of light that reaches Earth. This includes information about the object's tempera ...
... The Nature of Light At least 95% of the celestial information we receive is in the form of light. Astronomers have devised many techniques to decode as much of the encoded information as possible from the small amount of light that reaches Earth. This includes information about the object's tempera ...
Types of Stars http://space.about.com/od/stars/tp/What-Are
... sometimes see is actually an atmospheric effect and not a variation of the star), but some stars actually do vary. While some stars owe their variation to their rotation (like rotating neutron stars, called pulsars) most variable stars change brightness because of their continual expansion and contr ...
... sometimes see is actually an atmospheric effect and not a variation of the star), but some stars actually do vary. While some stars owe their variation to their rotation (like rotating neutron stars, called pulsars) most variable stars change brightness because of their continual expansion and contr ...
north south east west - Maryland Science Center
... equinox marks the first day of autumn. The Equinoxes are the only two days each year when the Sun rises due east and sets due west every place on Earth! If you happened to be standing at the Earth’s equator at noon on the Equinox, the Sun would pass directly overhead. Observe the Moon Night, October ...
... equinox marks the first day of autumn. The Equinoxes are the only two days each year when the Sun rises due east and sets due west every place on Earth! If you happened to be standing at the Earth’s equator at noon on the Equinox, the Sun would pass directly overhead. Observe the Moon Night, October ...
Luminosity Classes
... These are called Variable Stars. The change in luminosity is due to a change in size. (Though temperature changes too.) ...
... These are called Variable Stars. The change in luminosity is due to a change in size. (Though temperature changes too.) ...
Lecture17
... Used to classify stars by type: OBAFKM (from hottest to coldest). All stars have spectra lines or “gaps” in their continuous spectrum, just like the sun, but the lines differ, and depend on how hot the star is. Recently cool stellar types “L” and “T” were added, down to 700K at their surface! ...
... Used to classify stars by type: OBAFKM (from hottest to coldest). All stars have spectra lines or “gaps” in their continuous spectrum, just like the sun, but the lines differ, and depend on how hot the star is. Recently cool stellar types “L” and “T” were added, down to 700K at their surface! ...
Phobos
... This star is the famous Castor, the horseman. There is some idea that either this star or Pollux has changed in brightness over the past few hundred years because Castor is no longer the brighter of the two. Instead it is now ranked as the 23rd brightest star in the sky or perhaps we should say brig ...
... This star is the famous Castor, the horseman. There is some idea that either this star or Pollux has changed in brightness over the past few hundred years because Castor is no longer the brighter of the two. Instead it is now ranked as the 23rd brightest star in the sky or perhaps we should say brig ...
Distances farther out
... 5.3 K lines and chromospheres: Chromosphere: Low density, hot gaseous region (above the higher density photosphere, where the continuum and bulk of absorption lines form). Chromospheres detected by high resolution spectroscopy of strongest lines. Eg. Fraunhofer H & K lines of Ca II (H line of Ca II ...
... 5.3 K lines and chromospheres: Chromosphere: Low density, hot gaseous region (above the higher density photosphere, where the continuum and bulk of absorption lines form). Chromospheres detected by high resolution spectroscopy of strongest lines. Eg. Fraunhofer H & K lines of Ca II (H line of Ca II ...
Mathematical Methods in Ancient Astronomy
... radius ë/5 (where OC = ë) with an angular velocity which is twice the velocity of the elongation of the mean sun from the mean apsidal line of the lunar orbit. Hence not only the apsidal line but also the eccentricity varies according to position and length of OC. Translating these movements into th ...
... radius ë/5 (where OC = ë) with an angular velocity which is twice the velocity of the elongation of the mean sun from the mean apsidal line of the lunar orbit. Hence not only the apsidal line but also the eccentricity varies according to position and length of OC. Translating these movements into th ...
WELCOME TO THE MILKY WAY
... its path around the Sun, we have the seasons. During our summer, the northern side of Earth is pointed towards the Sun. That’s why we have longer days and shorter nights. During winter, the southern side of Earth is pointed towards the Sun (see also Fig. 1.2). Our ancestors already noticed that the ...
... its path around the Sun, we have the seasons. During our summer, the northern side of Earth is pointed towards the Sun. That’s why we have longer days and shorter nights. During winter, the southern side of Earth is pointed towards the Sun (see also Fig. 1.2). Our ancestors already noticed that the ...
Lunar-Cycle-Timeline
... correlation, I just knew that the SC frequencies would have to be tracked by designating the new moon as the final moment of each shift, rather than the initial moment. I did not think out the new rule, or ponder why it was so. Tracking the lunar dakini shifts recalls the age-old practice of "observ ...
... correlation, I just knew that the SC frequencies would have to be tracked by designating the new moon as the final moment of each shift, rather than the initial moment. I did not think out the new rule, or ponder why it was so. Tracking the lunar dakini shifts recalls the age-old practice of "observ ...
High-Speed Ballistic Stellar Interlopers
... can pick up enough energy through gravitational interaction with the others to be thrown from the system. Determining how many stars have been ejected from their neighbors is important to conducting an accurate census of the various types of stars born in an interstellar cloud. Scientists try to und ...
... can pick up enough energy through gravitational interaction with the others to be thrown from the system. Determining how many stars have been ejected from their neighbors is important to conducting an accurate census of the various types of stars born in an interstellar cloud. Scientists try to und ...
Constellation
In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU). These areas had their origins in Western-traditional asterisms from which the constellations take their names. There are 88 officially recognized constellations, covering the entire sky.Thus, any given point in a celestial coordinate system can unambiguously be assigned to a constellation. It is usual in astronomy to give the constellation in which a given object is found along with its coordinates in order to convey a rough idea in which part of the sky it is located. For example, saying the Horsehead Nebula is near Orion's Belt in the constellation Orion immediately locates it just south of the ecliptic and conveys that it is best observable in winter from the Northern Hemisphere.