Shape of a slowly rotating star measured by asteroseismology
... projected shape of the rapidly rotating A star Altair has been observed with infrared interferometry to have a flattening DR/R = 0.14 ± 0.03 (6, 7). Vega, another rapidly rotating A star, has an apparent deformation that is too small to be measured because it is seen almost pole-on (8). Here, we pre ...
... projected shape of the rapidly rotating A star Altair has been observed with infrared interferometry to have a flattening DR/R = 0.14 ± 0.03 (6, 7). Vega, another rapidly rotating A star, has an apparent deformation that is too small to be measured because it is seen almost pole-on (8). Here, we pre ...
SPIRAL STRUCTURE IN THE OUTER GALACTIC
... According to the age and the places where they are located, clusters present a variety of challenges in deriving their intrinsic parameters. In the case of very young clusters, they are normally close to the Galactic plane where interstellar absorption and crowded stellar fields make membership assi ...
... According to the age and the places where they are located, clusters present a variety of challenges in deriving their intrinsic parameters. In the case of very young clusters, they are normally close to the Galactic plane where interstellar absorption and crowded stellar fields make membership assi ...
Stars, Galaxies, and the Universe Section 1
... compact, these regions spin and shrink and begin to form a flattened disk. The disk has a central concentration of matter called a protostar. • The protostar continues to contract and increase in temperature for several million years. Eventually the gas in the region becomes so hot that its electron ...
... compact, these regions spin and shrink and begin to form a flattened disk. The disk has a central concentration of matter called a protostar. • The protostar continues to contract and increase in temperature for several million years. Eventually the gas in the region becomes so hot that its electron ...
The local spiral structure of the Milky Way
... line in Fig. 2 suggests, these sources trace what appears to be a high-inclination spur bridging the Local Arm to the Sagittarius Arm near l ≈ 50°. Additional evidence for this spur is provided by large-scale molecular emission from CO, as shown in the l-V diagram in Fig. 3. Assuming circular motion ...
... line in Fig. 2 suggests, these sources trace what appears to be a high-inclination spur bridging the Local Arm to the Sagittarius Arm near l ≈ 50°. Additional evidence for this spur is provided by large-scale molecular emission from CO, as shown in the l-V diagram in Fig. 3. Assuming circular motion ...
How Many Stars in the Sky?
... the number of stars, you should have a whole class discussion about possible ways to solve the problem. One possible method of solving the problem is to use small squares of paper to randomly choose which sections of the picture to count. Cut out about five or six 2 cm x 2 cm squares of paper for ea ...
... the number of stars, you should have a whole class discussion about possible ways to solve the problem. One possible method of solving the problem is to use small squares of paper to randomly choose which sections of the picture to count. Cut out about five or six 2 cm x 2 cm squares of paper for ea ...
3 - Celestial Sphere
... The celestial sphere is a model you can use to describe, explain, and predict the motion of the Sun and the stars in the sky. It models how the sky looks from Earth. Identify the underlined concepts on your celestial sphere: 1) There are imaginary points such as the North and South Celestial Poles ( ...
... The celestial sphere is a model you can use to describe, explain, and predict the motion of the Sun and the stars in the sky. It models how the sky looks from Earth. Identify the underlined concepts on your celestial sphere: 1) There are imaginary points such as the North and South Celestial Poles ( ...
Stars and Galaxies
... On the “Main Sequence”(continuous and distinctive band of stars that appears on plots of stellar color versus brightness ) Nuclear Fusion reactions (2 atoms jammed togetherenergy emitted as light and heat)- converts 600,000,000 tons of hydrogen into helium every second Many thousands of times clo ...
... On the “Main Sequence”(continuous and distinctive band of stars that appears on plots of stellar color versus brightness ) Nuclear Fusion reactions (2 atoms jammed togetherenergy emitted as light and heat)- converts 600,000,000 tons of hydrogen into helium every second Many thousands of times clo ...
Lecture 14
... be too small to measure accurately. The smallest parallax measurable from the ground is about 0.01 arcsec • Measure distances out to ~100 pc • But, only a few hundred stars are this close to the Sun ASTR111 Lecture 14 ...
... be too small to measure accurately. The smallest parallax measurable from the ground is about 0.01 arcsec • Measure distances out to ~100 pc • But, only a few hundred stars are this close to the Sun ASTR111 Lecture 14 ...
THE STAR OF BETHLEHEM
... Christ made a point of fulfilling the law of Moses in every detail (Mat. 5:17), which would have included beginning his public ministry at age 30 (Num. 4:3). He apparently began his public ministry at the Passover in A.D. 30 (after his baptism) because 1) his first miracle was done rather secretly " ...
... Christ made a point of fulfilling the law of Moses in every detail (Mat. 5:17), which would have included beginning his public ministry at age 30 (Num. 4:3). He apparently began his public ministry at the Passover in A.D. 30 (after his baptism) because 1) his first miracle was done rather secretly " ...
16_Testbank
... D) 30 E) 200 Answer: E 37) Which of the following discoveries, if they existed, would necessitate a reevaluation of our ideas of stellar formation? A) a cluster of stars that appeared to be 13 billion years old B) a 100-solar-mass star C) a 0.01-solar-mass star D) a molecular cloud without any stars ...
... D) 30 E) 200 Answer: E 37) Which of the following discoveries, if they existed, would necessitate a reevaluation of our ideas of stellar formation? A) a cluster of stars that appeared to be 13 billion years old B) a 100-solar-mass star C) a 0.01-solar-mass star D) a molecular cloud without any stars ...
2 Galaxy morphology and classification
... The spheroid is the smooth elliptical distribution of stars found in elliptical galaxies. It is composed primarily of an old, metal-poor, population of stars typically having ages „ 12 Gyr or more. The spheroid is thought to be among the first stellar components to form. The stellar halo is a di↵use ...
... The spheroid is the smooth elliptical distribution of stars found in elliptical galaxies. It is composed primarily of an old, metal-poor, population of stars typically having ages „ 12 Gyr or more. The spheroid is thought to be among the first stellar components to form. The stellar halo is a di↵use ...
PPT Only - Harvard-Smithsonian Center for Astrophysics
... Coordinated Molecular-Probe Line, Extinction & Thermal Emission Observations of Barnard 68 This figure highlights the work of Senior Collaborator João Alves and his collaborators. The top left panel shows a deep VLT image (Alves, Lada & Lada 2001). The middle top panel shows the 850 mm continuum emi ...
... Coordinated Molecular-Probe Line, Extinction & Thermal Emission Observations of Barnard 68 This figure highlights the work of Senior Collaborator João Alves and his collaborators. The top left panel shows a deep VLT image (Alves, Lada & Lada 2001). The middle top panel shows the 850 mm continuum emi ...
TEKS 8.13 A, B, and C
... these. This telescope is important to astronomers because it is located in space and its images are not distorted and destroyed by the atmosphere. TEKS 8.13 A, B, C TAKS Objective 5 ...
... these. This telescope is important to astronomers because it is located in space and its images are not distorted and destroyed by the atmosphere. TEKS 8.13 A, B, C TAKS Objective 5 ...
black hole
... The mass of a star is critical in determining its fate. Massive stars use up their nuclear fuel at a furious rate and die after only a few million years. In contrast, the lowest-mass stars use their fuel sparingly and may be able to live hundreds of billions of years. ...
... The mass of a star is critical in determining its fate. Massive stars use up their nuclear fuel at a furious rate and die after only a few million years. In contrast, the lowest-mass stars use their fuel sparingly and may be able to live hundreds of billions of years. ...
Quasars: Back to the Infant Universe
... What are Seyferts and Radio Galaxies? What is at the center of a galaxy that powers a quasar? Why are there few quasars close to us? Could quasars ever have existed close to us? Why is gas important? What is the merger cycle that drives quasars? Why is a quasar a phase in time rather than an object ...
... What are Seyferts and Radio Galaxies? What is at the center of a galaxy that powers a quasar? Why are there few quasars close to us? Could quasars ever have existed close to us? Why is gas important? What is the merger cycle that drives quasars? Why is a quasar a phase in time rather than an object ...
Low-Res Version - Chandra X
... ring associated with a shock wave from matter blown away from the star about 2000 years ago, a hot inner core associated with an intense optical brightening seen about 150 years ago, and within that core, a central source which may contain the superstar itself. Some astronomers think that it could e ...
... ring associated with a shock wave from matter blown away from the star about 2000 years ago, a hot inner core associated with an intense optical brightening seen about 150 years ago, and within that core, a central source which may contain the superstar itself. Some astronomers think that it could e ...
File - Adriana Romo
... Scientist: They got their name because of the white color of the first few white dwarfs discovered. Interviewer: How are white dwarfs characterized? Scientist: They are characterized by a low luminosity, a mass close to that of our sun,and radius only that of the earth. Interviewer: What was the fir ...
... Scientist: They got their name because of the white color of the first few white dwarfs discovered. Interviewer: How are white dwarfs characterized? Scientist: They are characterized by a low luminosity, a mass close to that of our sun,and radius only that of the earth. Interviewer: What was the fir ...
Main-Sequence Stars and the Sun
... relation to the surface temperature of the star is as follows. Hydrogen Balmer lines. Absorption lines caused by hydrogen atoms that are initially in the first excited state (see Chapter 1) are referred to as Balmer lines. At low surface temperatures, most of the hydrogen atoms are in the ground sta ...
... relation to the surface temperature of the star is as follows. Hydrogen Balmer lines. Absorption lines caused by hydrogen atoms that are initially in the first excited state (see Chapter 1) are referred to as Balmer lines. At low surface temperatures, most of the hydrogen atoms are in the ground sta ...
Effects of Mutual Transits by Extrasolar Planet
... light curves. We show that, especially for small separation cases, geometrical blocking of one faint object by the other transiting a parent star causes an apparent increase in light curves and characteristic fluctuations appear as an important evidence of mutual transits. We show also that extrasol ...
... light curves. We show that, especially for small separation cases, geometrical blocking of one faint object by the other transiting a parent star causes an apparent increase in light curves and characteristic fluctuations appear as an important evidence of mutual transits. We show also that extrasol ...
Application Exercise: Distances to Stars Using Measured Parallax
... One of the most difficult problems in astronomy is determining the distances to objects in the sky. There are four basic methods of determining distances: radar, parallax, standard candles, and the Hubble Law. Each of these methods is most useful at certain distances, with radar being useful nearby ...
... One of the most difficult problems in astronomy is determining the distances to objects in the sky. There are four basic methods of determining distances: radar, parallax, standard candles, and the Hubble Law. Each of these methods is most useful at certain distances, with radar being useful nearby ...
Log Scale Notes
... But already the Earth and Mercury are on top of each other and the star, Proxima Centauri - the nearest star to the sun, would be 40,000 number line units away! If we construct a number line that’s graduated in powers of 10 instead, we get the following: Mercury ...
... But already the Earth and Mercury are on top of each other and the star, Proxima Centauri - the nearest star to the sun, would be 40,000 number line units away! If we construct a number line that’s graduated in powers of 10 instead, we get the following: Mercury ...
- Cosmotography
... and merging in the halos around low-mass, “dwarf” galaxies. Many cases of extended stellar halos around dwarfs have been identified observationally (Stinson et al. 2009), but it is not clear if these stars were accreted, or formed in-situ. Star formation in dwarfs is thought to occur in stochastic e ...
... and merging in the halos around low-mass, “dwarf” galaxies. Many cases of extended stellar halos around dwarfs have been identified observationally (Stinson et al. 2009), but it is not clear if these stars were accreted, or formed in-situ. Star formation in dwarfs is thought to occur in stochastic e ...
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.