Draco: The Dragon - Courtney Stookey
... constellation quite literally looks like a snake slithering through the northern sky. While it’s not a very prominent constellation, it is still the 8th largest. There are quite a few versions of Greek mythology that are linked to Draco. There are 3 main contenders though. The most well-known myth i ...
... constellation quite literally looks like a snake slithering through the northern sky. While it’s not a very prominent constellation, it is still the 8th largest. There are quite a few versions of Greek mythology that are linked to Draco. There are 3 main contenders though. The most well-known myth i ...
Extra-Solar Life: Habitable Zones
... Mars – was OK once (?), but now cold Jupiter, Saturn, Uranus, Neptune too cold (though some moons may be OK) ...
... Mars – was OK once (?), but now cold Jupiter, Saturn, Uranus, Neptune too cold (though some moons may be OK) ...
THE HR DIAGRAM
... class and temperature while at the bottom, the x‐axis uses the B‐V color index. The y‐axis on the left uses luminosity in solar units while absolute magnitudes are at right. This is a plot of 22,000 stars from the Hipparcos Catalogue together with 1,000 low‐luminosity stars (red and white dwarfs ...
... class and temperature while at the bottom, the x‐axis uses the B‐V color index. The y‐axis on the left uses luminosity in solar units while absolute magnitudes are at right. This is a plot of 22,000 stars from the Hipparcos Catalogue together with 1,000 low‐luminosity stars (red and white dwarfs ...
Rogava_Course_-_First_lecture
... • Mizar A was the very first spectroscopic binary: in 1889 Edward PIckering found that it is a binary star.This binary is 35 times brigter than the Sun. • Orbital period ~20 days. • There exist double-lined (SB2) and single-lined (SB1) spectroscopic binaries. • Famous SB1 - Cygnus X-1 System. ...
... • Mizar A was the very first spectroscopic binary: in 1889 Edward PIckering found that it is a binary star.This binary is 35 times brigter than the Sun. • Orbital period ~20 days. • There exist double-lined (SB2) and single-lined (SB1) spectroscopic binaries. • Famous SB1 - Cygnus X-1 System. ...
Asymptotic Giant Branch
... The solid and dashed lines are from theoretical models calculated for a 1.5 solar mass star with varying mass of the 13C pocket. The solid line corresponds to ⅔ of the standard mass (which is 4×10−6 solar masses). The upper and lower dashed curve represent the envelope of a set of calculations where ...
... The solid and dashed lines are from theoretical models calculated for a 1.5 solar mass star with varying mass of the 13C pocket. The solid line corresponds to ⅔ of the standard mass (which is 4×10−6 solar masses). The upper and lower dashed curve represent the envelope of a set of calculations where ...
ILÍDIO LOPES ()
... particularly suited to the study of the external layers. It is usually known as the seismic parameter β. This quantity measures the phase shift experienced by acoustic waves when reflected by the surface of the stars. Image credit: http://www.hao.ucar.edu/ ...
... particularly suited to the study of the external layers. It is usually known as the seismic parameter β. This quantity measures the phase shift experienced by acoustic waves when reflected by the surface of the stars. Image credit: http://www.hao.ucar.edu/ ...
Circular ac
... Lyra.[1][2] The planet was discovered by NASA's Kepler spacecraft using the transit method, in which the dimming effect that a planet causes as it crosses in front of its star is measured. NASA announced the confirmation of the exoplanet on 6 January 2015.[1] Although it is not habitable, as of June ...
... Lyra.[1][2] The planet was discovered by NASA's Kepler spacecraft using the transit method, in which the dimming effect that a planet causes as it crosses in front of its star is measured. NASA announced the confirmation of the exoplanet on 6 January 2015.[1] Although it is not habitable, as of June ...
How Close is our Nearest Neighbor
... law so that their luminosities could be determined by measuring their periods of variation. These variable stars have been found in other galaxies, including our nearest neighbors. Introduction: Cepheid variable stars are simply stars whose brightness varies regularly. They are called Cepheids becau ...
... law so that their luminosities could be determined by measuring their periods of variation. These variable stars have been found in other galaxies, including our nearest neighbors. Introduction: Cepheid variable stars are simply stars whose brightness varies regularly. They are called Cepheids becau ...
a new isotopic abundance anomaly in chemically peculiar stars
... CP stars. It is significant that we find the 48Ca anomaly over a wide range of effective temperatures and atmospheric conditions. While details of the isotopic fraction processes discussed here are uncertain, one fact is clear. These CP stars have by far the most unusual natural fractionation mechan ...
... CP stars. It is significant that we find the 48Ca anomaly over a wide range of effective temperatures and atmospheric conditions. While details of the isotopic fraction processes discussed here are uncertain, one fact is clear. These CP stars have by far the most unusual natural fractionation mechan ...
Answer
... Luminosity remains constant at about 1 Lsun until about 10,000 Myr when it suddenly (and briefly) increases to over 4500 Lsun. 2. Describe how the radius of this star changes with time. Radius remains constant at about 1 Rsun until about 10,000 Myr when it suddenly (and briefly) increases to over 20 ...
... Luminosity remains constant at about 1 Lsun until about 10,000 Myr when it suddenly (and briefly) increases to over 4500 Lsun. 2. Describe how the radius of this star changes with time. Radius remains constant at about 1 Rsun until about 10,000 Myr when it suddenly (and briefly) increases to over 20 ...
Characteristics of Main Sequence Stars
... Characteristics of Main Sequence Stars Main-sequence stars obey several relations (which are mostly predictable from homology). • Main sequence stars obey a mass-luminosity relation, with L ∝ Mη . The slope η changes slightly over the range of masses; between 1 and 10M¯ , η ≈ 3.88. The relation flat ...
... Characteristics of Main Sequence Stars Main-sequence stars obey several relations (which are mostly predictable from homology). • Main sequence stars obey a mass-luminosity relation, with L ∝ Mη . The slope η changes slightly over the range of masses; between 1 and 10M¯ , η ≈ 3.88. The relation flat ...
Shocking Truth about Massive Stars Lidia Oskinova Chandra’s First Decade of Discovery
... ’’A very energetic explosion of a massive star is likely to create a ... fireball.... the inner core of a massive, rapidly rotating star collapses into a ~10 M Kerr black hole ... A superstrong ~10 15 G magnetic field is needed to make the object ... a microquasar. Such events must be vary rare...to ...
... ’’A very energetic explosion of a massive star is likely to create a ... fireball.... the inner core of a massive, rapidly rotating star collapses into a ~10 M Kerr black hole ... A superstrong ~10 15 G magnetic field is needed to make the object ... a microquasar. Such events must be vary rare...to ...
Astronomical Distance Ladder
... After distances of a few hundred parsecs it is necessary to look at the constant intrinsic properties of certain objects such as cepheid variable stars, RR Lyrae, novae, and supernovae. Distances to them are calculated fairly simple using the standard candle approach. Both types of cepheid variable ...
... After distances of a few hundred parsecs it is necessary to look at the constant intrinsic properties of certain objects such as cepheid variable stars, RR Lyrae, novae, and supernovae. Distances to them are calculated fairly simple using the standard candle approach. Both types of cepheid variable ...
Astrophysics notes
... telescope (directly proportional to the square of the diameter of the objective) define the term parallax as the apparent shift in position of a close object against a distant background due to a change in position of the observer define the term parsec (or parallax-second), the distance that corres ...
... telescope (directly proportional to the square of the diameter of the objective) define the term parallax as the apparent shift in position of a close object against a distant background due to a change in position of the observer define the term parsec (or parallax-second), the distance that corres ...
STAR FORMATION (Ch. 19)
... slight dependence on other things, like its total metal abundance). Note: the “main sequence” is the location in the H-R diagram of all stars of different ...
... slight dependence on other things, like its total metal abundance). Note: the “main sequence” is the location in the H-R diagram of all stars of different ...
Assignment 1
... The classic Fermi problem is “How many piano tuners are in the city?” I have done with with my introductory physics class every year since I become a professor, and we have never failed to be within 1 or 2 of the number listed in the phonebook! Let’s practice on another problem. I’ll lead you throug ...
... The classic Fermi problem is “How many piano tuners are in the city?” I have done with with my introductory physics class every year since I become a professor, and we have never failed to be within 1 or 2 of the number listed in the phonebook! Let’s practice on another problem. I’ll lead you throug ...
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”). ...
Linking Asteroids and Meteorites through Reflectance
... • The shell becomes so hot that its fusion rate is higher than the original core • This energy can not be transported fast enough to ...
... • The shell becomes so hot that its fusion rate is higher than the original core • This energy can not be transported fast enough to ...
Stellar Evolution
... Stars with a core temperature ranging from 15 million to 100 million K undergo the carbon cycle. The overall result is the same as the proton-proton cycle, but with different intermediates. In stars with a core temperature above 100 million K, the dominant nuclear process is the triple alpha pro ...
... Stars with a core temperature ranging from 15 million to 100 million K undergo the carbon cycle. The overall result is the same as the proton-proton cycle, but with different intermediates. In stars with a core temperature above 100 million K, the dominant nuclear process is the triple alpha pro ...
Project 4: The HR diagram. Open clusters
... tells you that there is some physical relationship between the luminosity and temperature of a star. From the figure, one sees that most stars fall along a diagonal strip from high temperature, high luminosity stars to low temperature, low luminosity stars. These are the main sequence ...
... tells you that there is some physical relationship between the luminosity and temperature of a star. From the figure, one sees that most stars fall along a diagonal strip from high temperature, high luminosity stars to low temperature, low luminosity stars. These are the main sequence ...
Stellar Evolution
... sequence when there is no more hydrogen fuel in their cores. The first few events are similar to those in lower-mass stars. 1. A hydrogen shell and a collapsing core. 2. Followed by a core burning helium to carbon, surrounded by helium- and hydrogen-burning shells. ...
... sequence when there is no more hydrogen fuel in their cores. The first few events are similar to those in lower-mass stars. 1. A hydrogen shell and a collapsing core. 2. Followed by a core burning helium to carbon, surrounded by helium- and hydrogen-burning shells. ...
Bright versus Nearby Stars
... – 75% are late stage giant stars – 25% are young hot (most probably B) stars. – Average absolute magnitude = -1.2 – Average luminosity = 300 solar luminosities. – Short lived stars or stars near the of their ...
... – 75% are late stage giant stars – 25% are young hot (most probably B) stars. – Average absolute magnitude = -1.2 – Average luminosity = 300 solar luminosities. – Short lived stars or stars near the of their ...
What we can measure
... really see them. This is possible for the nearer stars. We can actually see both stars individually and watch one orbit the other. These are called visual binaries. We need to be careful here, since some stars only appear to be close due to our perspective. These are called “optical doubles” and not ...
... really see them. This is possible for the nearer stars. We can actually see both stars individually and watch one orbit the other. These are called visual binaries. We need to be careful here, since some stars only appear to be close due to our perspective. These are called “optical doubles” and not ...
Boötes
Boötes /boʊˈoʊtiːz/ is a constellation in the northern sky, located between 0° and +60° declination, and 13 and 16 hours of right ascension on the celestial sphere. The name comes from the Greek Βοώτης, Boōtēs, meaning herdsman or plowman (literally, ox-driver; from βοῦς bous “cow”). The ""ö"" in the name is a diaeresis, not an umlaut, meaning that each 'o' is to be pronounced separately.One of the 48 constellations described by the 2nd century astronomer Ptolemy, Boötes is now one of the 88 modern constellations. It contains the fourth brightest star in the night sky, the orange-hued Arcturus. Boötes is home to many other bright stars, including eight above the fourth magnitude and an additional 21 above the fifth magnitude, making a total of 29 stars easily visible to the naked eye.