what kind of stars are the cepheids
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- delta Cephei. The namesake star in the very important class of stars known as Cepheid variables, this star formed part of the original study in which Henrietta Leavitt first discovered that the periods of luminosity were related to their absolute luminosity.This has proved to be an important distance measuring tool.amed after delta-Cephei, Cepheid Variables are the most important type of variable because it has been discovered that their periods of variability are related to their absolute luminosity.
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Draco Constellation Delta Draconis is a yellow giant star of the spectral type G9 III with an apparent magnitude of 3.07, about 97.4 light years distant from Earth. The star’s age is estimated at 800 million years. It is 59 times more luminous than the Sun.
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- 1 Different temperatures, or spectral types of stars group together on a plot of absolute magnitude versus temperature, called a Hetzsprung- Russell diagram. 2  Star types include main sequence stars, neutron stars, variable stars, dwarfs and white dwarfs, giants and super giants.  Standards.
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Pole star Currently, there is no South Star as useful as Polaris. Sigma Octantis is the closest naked-eye star to the south Celestial pole, but at apparent magnitude 5.45 it is barely visible on a clear night, making it unusable for navigational purposes. It is a yellow giant 275 light years from Earth.
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- These are the Red Giant stars. Patterns in the H-R Diagram We see that the H-R diagram can help us classify different kinds of stars, according to the pattern of where the stars fall in the diagram. The diagonal line that we saw for the Pleiades star cluster represents what we would call normal stars.
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Different Types of Stars in the Universe Stars are often classified according to spectral type. Although they emit all colors of light, spectral classification considers only the peak of this emission as an indicator of the star's surface temperature. Using this system, blue stars are the hottest, and are called O-type. The coolest stars are red and are called M-type. In order of increasing temperature, the spectral classes are M (red), K (orange), G (yellow), F (yellow-white), A (white), B (blue-white), O (blue). This bland categorization is often abandoned for a more descriptive alternative. As the coolest stars (red) are invariably the smallest, they are called red dwarfs. Conversely, the hottest stars are often called blue giants. There are a number of physical characteristics that vary for each of the different types of star.
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Cassiopeia, Queen of Ethiopia Constellation Cassiopeia is a northern hemispheric constellation which means it can't be seen easily or at all from the southern hemisphere. The brightest star in Cassiopeia is Schedar. There are 13 Extrasolar Planets (Exoplanets) in this constellation that are detailed on this site.
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The Hertzsprung - Russell Diagram Spectral Types and Surface Temperatures. Spectral types are a measure of the surface temperatures of stars and are letter designations: O, B, A, F, G, K, and M. Type O stars have the highest surface temperatures and can be as hot as 30,000 Kelvins. On the other extreme, type M stars have the lowest surface temperatures and can be as cool as 3,000 K. Hertzsprung-Russell Diagram The most significant feature of the HR Diagram is that the stars are not distributed in it at random (showing any combinations of absolute magnitudes and spectral types), but rather group themselves only into certain parts or regions of the diagram thus forming several groups.
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Cepheid variable Classical Cepheids (also known as Population I Cepheids, type I Cepheids, or Delta Cepheid variables) undergo pulsations with very regular periods on the order of days to months. Classical Cepheids are Population I variable stars which are 4–20 times more massive than the Sun, and up to 100,000 times more luminous.lassical Cepheids and type II Cepheids follow different period-luminosity relationships. The luminosity of type II Cepheids is, on average, less than classical Cepheids by about 1.5 magnitudes (but still brighter than RR Lyrae stars).
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THE FATE OF MASSIVE STARS 1 These fairly low mass stars end as white dwarfs made of C and O.  M > 4 Msun: Hot enough to fuse C and O to heavier elements. Very massive stars (massive enough to qualify as supergiants) are able to fuse all the way to iron, the `end of the line' as far as fusion is concerned.
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Cepheid Variable Stars & Distance Determination Both types of Cepheids and RR Lyrae stars all exhibit distinct period-luminosity relationships as shown below. Period-luminosity relationship for Cepheids and RR Lyrae stars. Let us now see how this relationship can be used to determine the distance to a Cepheid.
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The Colour of Stars Red giants such as Betelgeuse are not actually that red in colour. If you look at the colour in table 4.3 above you can see that its actual colour would be more orange than true red. A small group of stars do, however, appear deep red. These are the carbon stars such as 19 or TX Piscium.
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Stellar classification A-type stars are among the more common naked eye stars, and are white or bluish-white. They have strong hydrogen lines, at a maximum by A0, and also lines of ionized metals (Fe II, Mg II, Si II) at a maximum at A5. The presence of Ca II lines is notably strengthening by this point.
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Plants of the Eloise Butler Wildflower Garden Blazing Stars (also called Gayfeathers) of the Liatris genus have general characteristics of: Stem leaves narrow and lance shaped; the flower heads, typically numbering 5 to 60 (but 160+ on a few species), appear on a spike, each flowerhead containing a number of small tubular 5-lobed pink-purple florets.
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- them across the sky as they ride on the back of Taurus the bull). Today there are only six stars in the Pleiades that are easily visible to the naked eye. There are many theories about what happened to the 7th one. Celaeno has often been called the “Lost Pleiad” because she was hit by lightning according to Greek mythology.
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Cepheid Variable Stars, Supernovae and Distance Measurement Once the period of a distant Cepheid has been measured, its luminosity can be determined from the known behavior of Cepheid variables. Then its absolute magnitude and apparent magnitude can be related by the distance modulus equation, and its distance can be determined.Cepheid variables can be used to measure distances from about 1kpc to 50 Mpc. For example, if an astronomer observed a Cepheid star with period of 34 days, comparing to previously measured Cepheids, its absolute magnitude is -5.65. If its apparent magnitude was +23.0, the astronomer could use the distance modulus equation: m - M = 5 log d - 5.
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Constellations The evening sky is alive with creepy crawlers: snakes, a dragon, a lizard, and a scorpion. The most ancient is the dragon, Draco, which winds between Ursa Major and Ursa Minor. Almost 5,000 years ago its brightest star, Thuban, served as the Pole Star. Draco is a constellation in the far northern sky.
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Cepheid variable A group of pulsating stars on the instability strip have periods of less than 2 days, similar to RR Lyrae variables but with higher luminosities. Anomalous Cepheid variables have masses higher than type II Cepheids, RR Lyrae variables, and our sun.
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Top 10 Largest Stars In The Universe Mu Cephei is a red supergiant star in the constellation Cepheus. It is one of the largest and most luminous star known in the Milky Way. The distance to Mu Cephei is approximately 6000 light year. With 20 times more mass than the Sun it has 1,420 times more radius than the Sun, about 988,036,000 km.
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The Largest Stars in the Universe Star types from left to right: a red dwarf, our Sun, a blue dwarf, and R136a1 (hypergiant). Where star sizes are measured by radius, from centre to surface, and where 1 solar radius is equal to that of our Sun (km) – R136a1’s radius is 35.4 times greater than the Sun (approximately 24.8 million km).
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Beta Cassiopeiae Caph's corona is unusually weak. β Cassiopeiae is a variable star of the Delta Scuti type, in fact the second brightest of such stars in the sky after Altair. It is a monoperiodic pulsator, with a brightness that ranges from magnitude +2.25 to +2.31 with a period of 2.5 hours. Cassiopeiae is a variable star of the Delta Scuti type, in fact the second brightest of such stars in the sky after Altair. It is a monoperiodic pulsator, with a brightness that ranges from magnitude +2.25 to +2.31 with a period of 2.5 hours.
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Red Dwarfs: The Most Common and Longest-Lived Stars NASA's Hubble Space Telescope captures the image of the red dwarf star CHXR 73 and its companion, thought to be a brown dwarf. CHXR 73 is one-third less massive than the sun. Credit: NASA, ESA and K. Luhman (Penn State University).cientists think that 20 out of the 30 stars nearest to Earth are red dwarfs; however, none of them can be seen with the naked eye. The closest star to the sun, Proxima Centauri, is a red dwarf.
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Scorpius The constellation's bright stars form a pattern like a longshoreman's hook. Most of them are massive members of the nearest OB association: Scorpius-Centaurus. The star δ Sco, after having been a stable 2.3 magnitude star, flared in July 2000 to 1.9 in a matter of weeks. It has since become a variable star fluctuating between 2.0 and 1.6. This means that at its brightest it is the second brightest star in Scorpius.
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- I know of 10 different types of stars. They are called neutron stars, black dwarfs, white dwarfs, brown dwarfs, red dwarfs, yellow dwarfs, blue giants, red giants, blue supergiants and red supergiants. A neutron star is the remaining star after a giant star explodes and goes supernova.
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Stellar classification A-type stars are among the more common naked eye stars, and are white or bluish-white. They have strong hydrogen lines, at a maximum by A0, and also lines of ionized metals (Fe II, Mg II, Si II) at a maximum at A5.
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Rigel: Orion's Brightest Star In Japanese culture, Rigel is sometimes called Genji Boshi and a bright red star in Orion — Betelgeuse — has the name of Heike Boshi. Those names hearken back to the Heian era (794-1192) in Japan, according to an online account by Steve Renshaw and Saori Ihara.