Today in Astronomy 142: observations of stars
... ! RA (right ascension) tells you when your object is up. • 12 hours is up highest Mar 21 • 0 hours is up highest Sept 21 ! DEC (declination) tells you how far away from the north pole. Polaris is at +90. Anything below 0 degrees is hard to observe from the northern hemisphere. ! Spectral types and ...
... ! RA (right ascension) tells you when your object is up. • 12 hours is up highest Mar 21 • 0 hours is up highest Sept 21 ! DEC (declination) tells you how far away from the north pole. Polaris is at +90. Anything below 0 degrees is hard to observe from the northern hemisphere. ! Spectral types and ...
Special Relativity:
... While the Earth is in orbit, the relative speed of light towards and away from a star was thought to be: V = c + v where v equals 29 km/s, and c = 300,000 km/s. MM felt they could detect this difference. ...
... While the Earth is in orbit, the relative speed of light towards and away from a star was thought to be: V = c + v where v equals 29 km/s, and c = 300,000 km/s. MM felt they could detect this difference. ...
Article Reference - Archive ouverte UNIGE
... though a semi amplitude between 60 and 70 m s−1 had been expected. This can be explained either by a highly inclined planet (the impact parameter b < 0.1, even when adjusting only the photometry (see Triaud et al. 2011 for details) or by an additional unaccounted-for broadening of the spectral lines ...
... though a semi amplitude between 60 and 70 m s−1 had been expected. This can be explained either by a highly inclined planet (the impact parameter b < 0.1, even when adjusting only the photometry (see Triaud et al. 2011 for details) or by an additional unaccounted-for broadening of the spectral lines ...
Hungry Young Stars: A New Explanation for the FU Ori Outbursts
... • We provide an explanation for the origin of FU Ori bursts. • A young star devours embryos that form in the disk, resulting in colossal bursts of luminosity. This process repeats as long as nebular material rains onto the disk. • The new feature in our model is the self-consistent formation and evo ...
... • We provide an explanation for the origin of FU Ori bursts. • A young star devours embryos that form in the disk, resulting in colossal bursts of luminosity. This process repeats as long as nebular material rains onto the disk. • The new feature in our model is the self-consistent formation and evo ...
Astronomy vs. Astrology: Uptodate Zodiac Signs and Dates
... is with that of a spinning top, tilted at an angle, which slowly wobbles in a circle while rotating much faster on its axis. Similarly, the Earth’s axis completes the Circle of Precession in 26,000 years, while rotating on its axis in one day or about 24 hours (23h 56 m, to be precise). In addition ...
... is with that of a spinning top, tilted at an angle, which slowly wobbles in a circle while rotating much faster on its axis. Similarly, the Earth’s axis completes the Circle of Precession in 26,000 years, while rotating on its axis in one day or about 24 hours (23h 56 m, to be precise). In addition ...
The Pistol Star - Emmi
... Size of Pistol Star • The Pistol Star is about 340 times the diameter of the Sun. • Total, it is about 100 times more massive that the sun. • The Pistol Star is big enough to fill the diameter of the Earth’s orbit. ...
... Size of Pistol Star • The Pistol Star is about 340 times the diameter of the Sun. • Total, it is about 100 times more massive that the sun. • The Pistol Star is big enough to fill the diameter of the Earth’s orbit. ...
Lecture 12, PPT version
... Galaxy). All of the stars formed at roughly the same time. Globular clusters have lots of RED stars, but no BLUE stars (because they died long ago and were not “replenished”). ...
... Galaxy). All of the stars formed at roughly the same time. Globular clusters have lots of RED stars, but no BLUE stars (because they died long ago and were not “replenished”). ...
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 ...
Notes and Equations
... orbital periods. We therefore see them approximately in the direction of the ecliptic. The motion of the planets can be somewhat complicated. On the average, all the major planets move from west to east as part of their revolution around the Sun. However, the are also seen to undergo retrograde moti ...
... orbital periods. We therefore see them approximately in the direction of the ecliptic. The motion of the planets can be somewhat complicated. On the average, all the major planets move from west to east as part of their revolution around the Sun. However, the are also seen to undergo retrograde moti ...
- National Optical Astronomy Observatory
... Figure 1: (X=color index (b-v), Y=Brightness (v)) According to the graph, the tip of the main sequence appears to lie around NGC 1496-1. This star’s color index is approximately 0.062, classifying it as a spectral type A star. Based on this observation, the age of the cluster is estimated to be no ...
... Figure 1: (X=color index (b-v), Y=Brightness (v)) According to the graph, the tip of the main sequence appears to lie around NGC 1496-1. This star’s color index is approximately 0.062, classifying it as a spectral type A star. Based on this observation, the age of the cluster is estimated to be no ...
Supernovae Gamma-Ray Bursts and and some of their uses
... surrounding interstellar medium at V > 104 km/s, compresses it, intermingles with it, enriches it with freshly synthesized heavy elements, and forms what is called a supernova remnant • Supernova remnants may be observed for hundreds of thousands of years as often beautiful, visual objects, but also ...
... surrounding interstellar medium at V > 104 km/s, compresses it, intermingles with it, enriches it with freshly synthesized heavy elements, and forms what is called a supernova remnant • Supernova remnants may be observed for hundreds of thousands of years as often beautiful, visual objects, but also ...
PHS 111 Test 3 Review Chapters 26-28
... We say we are looking back in time when we are looking at the stars because: we see stars as they once were when their light reaches us. space curves, we are actually looking at the past when we look in the night sky. stars are emitting immense radiation, we are seeing processes that have already ...
... We say we are looking back in time when we are looking at the stars because: we see stars as they once were when their light reaches us. space curves, we are actually looking at the past when we look in the night sky. stars are emitting immense radiation, we are seeing processes that have already ...
Lecture 11
... • In the 60s, we began to detect intense bursts of Gamma Rays • In the 90s it was discovered that the sources were evenly distributed across the sky • Since then, the Bursts have been traced to massive explosions in distant galaxies ...
... • In the 60s, we began to detect intense bursts of Gamma Rays • In the 90s it was discovered that the sources were evenly distributed across the sky • Since then, the Bursts have been traced to massive explosions in distant galaxies ...
Physics: Principle and Applications, 7e (Giancoli) Chapter 33
... B) red giant stars. C) regular stars like our sun. D) white dwarfs. Answer: A Var: 1 7) Black holes A) are gaps in space, containing no matter. B) are predicted by Einstein's special theory of relativity. C) are the collapsed remnant of giant stars. D) cannot be detected in binary star systems. E) a ...
... B) red giant stars. C) regular stars like our sun. D) white dwarfs. Answer: A Var: 1 7) Black holes A) are gaps in space, containing no matter. B) are predicted by Einstein's special theory of relativity. C) are the collapsed remnant of giant stars. D) cannot be detected in binary star systems. E) a ...
Ursa Minor
Ursa Minor (Latin: ""Smaller She-Bear"", contrasting with Ursa Major), also known as the Little Bear, is a constellation in the northern sky. Like the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, hence the name Little Dipper. It was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and remains one of the 88 modern constellations. Ursa Minor has traditionally been important for navigation, particularly by mariners, due to Polaris being the North Star.Polaris, the brightest star in the constellation, is a yellow-white supergiant and the brightest Cepheid variable star in the night sky, ranging from apparent magnitude 1.97 to 2.00. Beta Ursae Minoris, also known as Kochab, is an aging star that has swollen and cooled to become an orange giant with an apparent magnitude of 2.08, only slightly fainter than Polaris. Kochab and magnitude 3 Gamma Ursae Minoris have been called the ""guardians of the pole star"". Planets have been detected orbiting four of the stars, including Kochab. The constellation also contains an isolated neutron star—Calvera—and H1504+65, the hottest white dwarf yet discovered with a surface temperature of 200,000 K.