Power Point Presentation
... Temperature (degrees K) - color of star light. All stars with the same blackbody temperature are the same color. Specific spectral lines appear for each temperature range classification. Astronomers name temperature ranges in decreasing order as: ...
... Temperature (degrees K) - color of star light. All stars with the same blackbody temperature are the same color. Specific spectral lines appear for each temperature range classification. Astronomers name temperature ranges in decreasing order as: ...
Temperate Earth-sized planets transiting a nearby ultracool dwarf star
... attributed to planet TRAPPIST-1d originate instead from two different planets, but the consistency of their main parameters (duration, depth and impact parameter) as derived from their individual analyses does not favour this scenario. TRAPPIST-1 is a well characterized, isolated M8.0 ± 0.5-type dwa ...
... attributed to planet TRAPPIST-1d originate instead from two different planets, but the consistency of their main parameters (duration, depth and impact parameter) as derived from their individual analyses does not favour this scenario. TRAPPIST-1 is a well characterized, isolated M8.0 ± 0.5-type dwa ...
Chasing the Pole — Howard L. Cohen
... Interestingly, all three stars in this triple system have similar principle spectral classes (Type F) showing they are all slightly hotter than the Sun. Polaris, however, is a supergiant or bright giant star, about 2,400 times more luminous than the Sun and 45 times larger in diameter, but much more ...
... Interestingly, all three stars in this triple system have similar principle spectral classes (Type F) showing they are all slightly hotter than the Sun. Polaris, however, is a supergiant or bright giant star, about 2,400 times more luminous than the Sun and 45 times larger in diameter, but much more ...
Astronomy Activities/Demonstrations
... 1. Explain to the students what the aim of the activity is: to illustrate the relative sizes and distances between the Sun, planets and Pluto. This activity is ideally conducted with 2-3 students per marker, with the markers placed along a straight line. Determine ahead of time where to position the ...
... 1. Explain to the students what the aim of the activity is: to illustrate the relative sizes and distances between the Sun, planets and Pluto. This activity is ideally conducted with 2-3 students per marker, with the markers placed along a straight line. Determine ahead of time where to position the ...
Continuous Spectrum Absorption Line Spectrum Emission Line
... to the relative position in the spectral sequence. For example, O1 is earlier than O8; and B3 is later than O8. Stars come in a wide range of sizes and temperatures. The hottest stars in the sky have temperatures in excess of 40,000 K, whereas the coolest stars that we can detect optically have temp ...
... to the relative position in the spectral sequence. For example, O1 is earlier than O8; and B3 is later than O8. Stars come in a wide range of sizes and temperatures. The hottest stars in the sky have temperatures in excess of 40,000 K, whereas the coolest stars that we can detect optically have temp ...
LAB #3 - GEOCITIES.ws
... Because what we know about stars is due solely to our analysis of their light, it is very important to develop further the idea of stellar magnitude, or how bright a star is. When the Greeks scientist Hipparcos determined the magnitude scale, he did it "by eye." The first stars that "came out" at ni ...
... Because what we know about stars is due solely to our analysis of their light, it is very important to develop further the idea of stellar magnitude, or how bright a star is. When the Greeks scientist Hipparcos determined the magnitude scale, he did it "by eye." The first stars that "came out" at ni ...
8th Ed【CH13】
... 8th Ed【Problem 13-56】：9th Ed【Problem 13-54】 Hunting a black hole. Observations of the light from a certain star indicate that it is part of a binary (two-star) system. This visible star has orbital speed v = 270km / s , orbital period T = 1.7days , and approximate mass m1 = 6M S , where M S is the S ...
... 8th Ed【Problem 13-56】：9th Ed【Problem 13-54】 Hunting a black hole. Observations of the light from a certain star indicate that it is part of a binary (two-star) system. This visible star has orbital speed v = 270km / s , orbital period T = 1.7days , and approximate mass m1 = 6M S , where M S is the S ...
Sample file
... Radiative Zone: The radiative zone extends beyond the Sun's core layer, for about another 55% of the Sun's radius. Energy from the nuclear fusion reactions in the core is carried through the plasma of the radiative zone by the sequential absorption and reemission of photons, or energy packets, by ga ...
... Radiative Zone: The radiative zone extends beyond the Sun's core layer, for about another 55% of the Sun's radius. Energy from the nuclear fusion reactions in the core is carried through the plasma of the radiative zone by the sequential absorption and reemission of photons, or energy packets, by ga ...
PPTX
... Speculations, continued • Since Lo 4 lies near boundary between [WCE] and PG 1159 PNNi, it may take only a small perturbation to cause transition to [WCE] • For example, occasionally many pulsation modes will be in phase, giving a temporarily large amplitude—could this trigger an outburst? – If so, ...
... Speculations, continued • Since Lo 4 lies near boundary between [WCE] and PG 1159 PNNi, it may take only a small perturbation to cause transition to [WCE] • For example, occasionally many pulsation modes will be in phase, giving a temporarily large amplitude—could this trigger an outburst? – If so, ...
Neutron Stars
... Periods shorter than this do not exist (such as in the previous calculation) because the object would have to rotate so fast it would overcome gravity and fly apart. ...
... Periods shorter than this do not exist (such as in the previous calculation) because the object would have to rotate so fast it would overcome gravity and fly apart. ...
Exoplanets
... finding another world that harbours life. Exobiology is concerned with the study of life outside of the Earth. The concept of “life” is subject to debate, but there is agreement in defining the features that could permit the development of carbonbased life: ...
... finding another world that harbours life. Exobiology is concerned with the study of life outside of the Earth. The concept of “life” is subject to debate, but there is agreement in defining the features that could permit the development of carbonbased life: ...
Section9 - University of Chicago
... As the first massive stars and quasars form they will be emitting lots of UV photons. These will tend to to re-ionize the hydrogen in the Universe (prior to this, hydrogen was last ionized at the surface of last scattering.) In fact, the Universe we see around us today has neutral hydrogen only in d ...
... As the first massive stars and quasars form they will be emitting lots of UV photons. These will tend to to re-ionize the hydrogen in the Universe (prior to this, hydrogen was last ionized at the surface of last scattering.) In fact, the Universe we see around us today has neutral hydrogen only in d ...
observing cards - NC Science Festival
... M13, the Great Hercules Globular, is one of the finest you’ll observe. In 1974 the first radio message about Earth was sent into outer space from the Arecibo Observatory. It was pointed in the direction of this globular cluster. Its journey will take more than 25,000 years. Our aim was a bit o ...
... M13, the Great Hercules Globular, is one of the finest you’ll observe. In 1974 the first radio message about Earth was sent into outer space from the Arecibo Observatory. It was pointed in the direction of this globular cluster. Its journey will take more than 25,000 years. Our aim was a bit o ...
11-Massive Stars
... to understand the complex bipolar outflows in massive star formation and proof will require interferometer observations. The outflows are difficult to study because multiple outflows often emanate from the same large scale core. Clusters of stars form simultaneously in a core and the outflows origin ...
... to understand the complex bipolar outflows in massive star formation and proof will require interferometer observations. The outflows are difficult to study because multiple outflows often emanate from the same large scale core. Clusters of stars form simultaneously in a core and the outflows origin ...
Between the Stars: Gas and Dust in Space
... its temperature and composition The red color commonly seen in interstellar gas comes from ionized hydrogen, or H II The proton recombines with an electron which then moves down to the lowest-energy orbit by emitting a red-wavelength photon H I refers to a neutral type of region temperature (K) hydr ...
... its temperature and composition The red color commonly seen in interstellar gas comes from ionized hydrogen, or H II The proton recombines with an electron which then moves down to the lowest-energy orbit by emitting a red-wavelength photon H I refers to a neutral type of region temperature (K) hydr ...
The Physical Properties of Normal A Stars
... Dor stars Abt & associates find for most A stars a rotational velocity of approximately 120 km/s separates the slower rotating peculiar A stars from the normal A stars. However, there are some faster rotating mCP stars, e.g., 56 Ari and CU Vir. Thus normal A stars have surficial abundances clos ...
... Dor stars Abt & associates find for most A stars a rotational velocity of approximately 120 km/s separates the slower rotating peculiar A stars from the normal A stars. However, there are some faster rotating mCP stars, e.g., 56 Ari and CU Vir. Thus normal A stars have surficial abundances clos ...
April - Bristol Astronomical Society
... and Apollo. It was put into the sky just out of reach of the Corvus as a punishment for the bird failing to fetch water for Apollo, the cup is normally represented as a large double-handed chalice of the type known in Greece as a Krater. Objects in Crater There are no Messier objects in Crater, howe ...
... and Apollo. It was put into the sky just out of reach of the Corvus as a punishment for the bird failing to fetch water for Apollo, the cup is normally represented as a large double-handed chalice of the type known in Greece as a Krater. Objects in Crater There are no Messier objects in Crater, howe ...
ppt - Astronomy at Swarthmore College
... But…some hot stars have x-ray spectra with quite narrow lines, that are especially strong and high energy - not consistent with line-force instability wind shocks Pup ...
... But…some hot stars have x-ray spectra with quite narrow lines, that are especially strong and high energy - not consistent with line-force instability wind shocks Pup ...
OUR COSMIC NEIGHBORS Story of the Stars
... The Dragon was the terrible Typhon that caused Pan to jump into the Nile River, and also caused Venus and her son, Cupid, to take refuge in the Euphrates River. One cannot look at the dragon with its coils wrapped around Thuban, the former Pole Star, without recalling the Hindu legend about the snak ...
... The Dragon was the terrible Typhon that caused Pan to jump into the Nile River, and also caused Venus and her son, Cupid, to take refuge in the Euphrates River. One cannot look at the dragon with its coils wrapped around Thuban, the former Pole Star, without recalling the Hindu legend about the snak ...
Discovery of White Dwarfs—8 Oct
... • Apparent mag is a logarithmetic expression of flux • If the apparent mag changes by 2.5, the flux is brighter by a factor of 10. • Fluxes and magnitudes of two stars A and B ...
... • Apparent mag is a logarithmetic expression of flux • If the apparent mag changes by 2.5, the flux is brighter by a factor of 10. • Fluxes and magnitudes of two stars A and B ...
IK Pegasi
IK Pegasi (or HR 8210) is a binary star system in the constellation Pegasus. It is just luminous enough to be seen with the unaided eye, at a distance of about 150 light years from the Solar System.The primary (IK Pegasi A) is an A-type main-sequence star that displays minor pulsations in luminosity. It is categorized as a Delta Scuti variable star and it has a periodic cycle of luminosity variation that repeats itself about 22.9 times per day. Its companion (IK Pegasi B) is a massive white dwarf—a star that has evolved past the main sequence and is no longer generating energy through nuclear fusion. They orbit each other every 21.7 days with an average separation of about 31 million kilometres, or 19 million miles, or 0.21 astronomical units (AU). This is smaller than the orbit of Mercury around the Sun.IK Pegasi B is the nearest known supernova progenitor candidate. When the primary begins to evolve into a red giant, it is expected to grow to a radius where the white dwarf can accrete matter from the expanded gaseous envelope. When the white dwarf approaches the Chandrasekhar limit of 1.44 solar masses (M☉), it may explode as a Type Ia supernova.