Hertzsprung–Russell diagram - Wikipedia, the free encyclopedia
... magnitude on the vertical axis. The spectral type is not a numerical quantity, but the sequence of spectral types is a monotonic series ordered by stellar surface temperature. Modern observational versions of the chart replace spectral type by a color index (in diagrams made in the middle of the 20t ...
... magnitude on the vertical axis. The spectral type is not a numerical quantity, but the sequence of spectral types is a monotonic series ordered by stellar surface temperature. Modern observational versions of the chart replace spectral type by a color index (in diagrams made in the middle of the 20t ...
Editable Schemes of Work - Approach 1
... The scheme of work contains suggestions for resources that you can use to support your teaching. These are suggestions only of material you may find useful and you are encouraged to use a wide range of resources that suit the needs of your students. ...
... The scheme of work contains suggestions for resources that you can use to support your teaching. These are suggestions only of material you may find useful and you are encouraged to use a wide range of resources that suit the needs of your students. ...
Rotation Periods of Wide Binaries in the Kepler Field
... M⊙ ) the initial rotation rates are the limiting factors in the age precision of older stars. The Kepler mission to search for exoplanets (Borucki, et al. 2011) has for the first time provided the observational material needed to extend the calibation of the age-rotation period-spectral type relatio ...
... M⊙ ) the initial rotation rates are the limiting factors in the age precision of older stars. The Kepler mission to search for exoplanets (Borucki, et al. 2011) has for the first time provided the observational material needed to extend the calibation of the age-rotation period-spectral type relatio ...
instructor notes stellar evolution, star clusters
... frequently discussed for the case of the Hyades star cluster, which is the standard cluster used for the construction of the empirical stellar ZAMS. The constellations Ursa Major and Scorpius also contain moving clusters, and the Pleiades have attracted considerable attention as a moving cluster. In ...
... frequently discussed for the case of the Hyades star cluster, which is the standard cluster used for the construction of the empirical stellar ZAMS. The constellations Ursa Major and Scorpius also contain moving clusters, and the Pleiades have attracted considerable attention as a moving cluster. In ...
instructor notes stellar evolution, star clusters
... frequently discussed for the case of the Hyades star cluster, which is the standard cluster used for the construction of the empirical stellar ZAMS. The constellations Ursa Major and Scorpius also contain moving clusters, and the Pleiades have attracted considerable attention as a moving cluster. In ...
... frequently discussed for the case of the Hyades star cluster, which is the standard cluster used for the construction of the empirical stellar ZAMS. The constellations Ursa Major and Scorpius also contain moving clusters, and the Pleiades have attracted considerable attention as a moving cluster. In ...
Founders of Modern Astronomy
... positions of celestial objects. It is true that two fields share a common origin and a part of their methods but they are two distinct fields. Astronomy is one of the oldest sciences. It has played an important role in most, if not all, cultures over th e ages. There are records to show that astrono ...
... positions of celestial objects. It is true that two fields share a common origin and a part of their methods but they are two distinct fields. Astronomy is one of the oldest sciences. It has played an important role in most, if not all, cultures over th e ages. There are records to show that astrono ...
2Discovering the Universe for Yourself
... interstellar clouds that make up the Milky Way in the night sky; that is why the band of light makes a full The Milky Way in the night sky is our view circle around our sky. The Milky in all directions into the disk of our galaxy. Way appears somewhat wider in the direction of the constellation Sagi ...
... interstellar clouds that make up the Milky Way in the night sky; that is why the band of light makes a full The Milky Way in the night sky is our view circle around our sky. The Milky in all directions into the disk of our galaxy. Way appears somewhat wider in the direction of the constellation Sagi ...
Colloquial Jakartan Indonesian
... For as far back as the four or five thousand years that we can trace them culturally, Austronesian speakers have preferred to live close to the sea.1 They have typically been sailors and fishermen. For as long as their settlements were confined to southeast Asia and northwest Melanesia, virtually al ...
... For as far back as the four or five thousand years that we can trace them culturally, Austronesian speakers have preferred to live close to the sea.1 They have typically been sailors and fishermen. For as long as their settlements were confined to southeast Asia and northwest Melanesia, virtually al ...
ASTRONOMICAL BINOCULARS
... A reliably quick way to judge seeing conditions is to look at bright stars about 40° above the horizon. If the stars appear to twinkle, there is significant atmospheric distortion and viewing at high magnification will not be ideal. If these stars are steadily bright, chances of successful viewing a ...
... A reliably quick way to judge seeing conditions is to look at bright stars about 40° above the horizon. If the stars appear to twinkle, there is significant atmospheric distortion and viewing at high magnification will not be ideal. If these stars are steadily bright, chances of successful viewing a ...
celestial navigation heaven`s guide for mere
... largest known type of star and can rarely be found. When supergiant stars die, they undergo a supernova explosion and become black holes. Besides that, under the faint and virtually dead stars group, there are four other sub-groups namely white dwarfs, brown dwarfs, neutron stars and pulsars. A whi ...
... largest known type of star and can rarely be found. When supergiant stars die, they undergo a supernova explosion and become black holes. Besides that, under the faint and virtually dead stars group, there are four other sub-groups namely white dwarfs, brown dwarfs, neutron stars and pulsars. A whi ...
Exploring the Universe
... – What we see is called the apparent magnitude – Absolute magnitude is a measurement of the brightness as if the distance from the earth was 32.6 light years away. A uniform distance, so it’s the real brightness. – Besides the sun, the brightest star is Sirius ...
... – What we see is called the apparent magnitude – Absolute magnitude is a measurement of the brightness as if the distance from the earth was 32.6 light years away. A uniform distance, so it’s the real brightness. – Besides the sun, the brightest star is Sirius ...
On the definition and use of the ecliptic in
... 1) The adoption of the ICRS and ICRF (IAU 1997 Resolution B2) International Celestial Reference System (ICRS)*: the idealized barycentric coordinate system to which celestial positions are referred. It is kinematically non-rotating with respect to the ensemble of distant extragalactic objects. It h ...
... 1) The adoption of the ICRS and ICRF (IAU 1997 Resolution B2) International Celestial Reference System (ICRS)*: the idealized barycentric coordinate system to which celestial positions are referred. It is kinematically non-rotating with respect to the ensemble of distant extragalactic objects. It h ...
Magnetic fields in O-, B- and A-type stars on the main sequence
... An explanation of the observed fields of Ap stars already proposed a long time ago is the fossil origin. The fossil origin suggests that magnetic fields reside inside the star without being continuously renewed. Therefore, these fields have been formed during an early phase of the life of the star. The ...
... An explanation of the observed fields of Ap stars already proposed a long time ago is the fossil origin. The fossil origin suggests that magnetic fields reside inside the star without being continuously renewed. Therefore, these fields have been formed during an early phase of the life of the star. The ...
NSDL/NSTA Web Seminar: Celebrating Astronomy: A Star`s Story
... http://www.compadre.org/Astronomy Hubble Space Telescope http://hubblesite.org International Year of Astronomy 2009 http://astronomy2009.us http://astronomy2009.org ...
... http://www.compadre.org/Astronomy Hubble Space Telescope http://hubblesite.org International Year of Astronomy 2009 http://astronomy2009.us http://astronomy2009.org ...
Celebrating Astronomy: The Life of a Star
... http://www.compadre.org/Astronomy Hubble Space Telescope http://hubblesite.org International Year of Astronomy 2009 http://astronomy2009.us http://astronomy2009.org ...
... http://www.compadre.org/Astronomy Hubble Space Telescope http://hubblesite.org International Year of Astronomy 2009 http://astronomy2009.us http://astronomy2009.org ...
Annual report 2004 - Département d`Astrophysique, Géophysique et
... independently performed by several teams of the COROT Seismology Working Group. The aim of such exercises, which are commonly used in helioseismology, is to prepare the data analysis and scientific interpretation of the asteroseismic COROT observations. This will help in the development and testing ...
... independently performed by several teams of the COROT Seismology Working Group. The aim of such exercises, which are commonly used in helioseismology, is to prepare the data analysis and scientific interpretation of the asteroseismic COROT observations. This will help in the development and testing ...
Properties of Wolf-Rayet Stars - Paul Crowther, University of Sheffield
... Visual spectral classification of WR stars is based on emission line strengths and line ratios (Smith 1968). To date, high-ionization WN2 to WN5 are known as ‘early WN’ (WNE) stars, and low-ionization WN7 to WN9(–11) stars known as ‘late WN’ (WNL) stars, and WN6 stars either early or late-type. Comp ...
... Visual spectral classification of WR stars is based on emission line strengths and line ratios (Smith 1968). To date, high-ionization WN2 to WN5 are known as ‘early WN’ (WNE) stars, and low-ionization WN7 to WN9(–11) stars known as ‘late WN’ (WNL) stars, and WN6 stars either early or late-type. Comp ...
Abundances and possible diffusion of elements in M 67 stars⋆
... vs. the means of the two photometric temperatures with the correction mentioned above. It is seen that these two temperature scales agree well. The mean difference is −2 K and the standard deviation is 46 K. There may be a tendency for the different stellar groups to behave somewhat differently, the MS ...
... vs. the means of the two photometric temperatures with the correction mentioned above. It is seen that these two temperature scales agree well. The mean difference is −2 K and the standard deviation is 46 K. There may be a tendency for the different stellar groups to behave somewhat differently, the MS ...
the saptarishis calendar: `the indian tropical zodiac`!
... (Sloka 4, Chapter XIII; Iyer, 1984: 80). The meaning of the term ―conjunction‖ in the Vishnu Purana quotation is often misinterpreted as Nakshatra (lunar mansion) but it should not be. ‗Conjunction‘ can be understood better as the meeting point of the Saptarishis pointer with the ecliptic. In other ...
... (Sloka 4, Chapter XIII; Iyer, 1984: 80). The meaning of the term ―conjunction‖ in the Vishnu Purana quotation is often misinterpreted as Nakshatra (lunar mansion) but it should not be. ‗Conjunction‘ can be understood better as the meeting point of the Saptarishis pointer with the ecliptic. In other ...
100 Binocular Deep Sky Objects
... in a group, but usually 2 objects in a group. Seeing DSOs in groups makes observing that much more enjoyable. Many of these objects are challenging and may not be seen unless observing with large binoculars or in very dark skies. In some cases I discuss what can be seen in various sizes of binocular ...
... in a group, but usually 2 objects in a group. Seeing DSOs in groups makes observing that much more enjoyable. Many of these objects are challenging and may not be seen unless observing with large binoculars or in very dark skies. In some cases I discuss what can be seen in various sizes of binocular ...
Celestial Navitation - National University of Singapore
... and the North Star (Polaris), they were able to determine directions and estimated distances from the time it took to cover them. Thus they created simple charts and knew a basic form of dead reckoning (see instruments). Celestial Navigation ...
... and the North Star (Polaris), they were able to determine directions and estimated distances from the time it took to cover them. Thus they created simple charts and knew a basic form of dead reckoning (see instruments). Celestial Navigation ...
Stellarium User Guide - Skolekonsulenterne.dk
... As well as travelling through time, Stellarium lets to look around the sky freely, and zoom in and out. There are several ways to accomplish this listed in table 3.4. Let’s try it. Use the cursors to move around left, right, up and down. Zoom in a little using the Page Up key, and back out again usi ...
... As well as travelling through time, Stellarium lets to look around the sky freely, and zoom in and out. There are several ways to accomplish this listed in table 3.4. Let’s try it. Use the cursors to move around left, right, up and down. Zoom in a little using the Page Up key, and back out again usi ...
Searching for RR Lyrae Stars in M15
... RR Lyrae stars are not variable stars their whole lives. Instead, they are formed as a result of stellar evolution. RR Lyrae stars evolve the way lowmass stars are expected to. A RR Lyrae star is believed to have started off as a main sequence star with a mass around 0.8 M . The progenitor of a RR ...
... RR Lyrae stars are not variable stars their whole lives. Instead, they are formed as a result of stellar evolution. RR Lyrae stars evolve the way lowmass stars are expected to. A RR Lyrae star is believed to have started off as a main sequence star with a mass around 0.8 M . The progenitor of a RR ...
Observing Stellar Evolution
... Many stars have multiple names and appear in multiple catalogs. It is confusing. Software that maps the sky can use one or more of the designations to identify a star, but not all. Astronomy is an old science and over time many names and catalogs have been developed. Those of us who are amateur astr ...
... Many stars have multiple names and appear in multiple catalogs. It is confusing. Software that maps the sky can use one or more of the designations to identify a star, but not all. Astronomy is an old science and over time many names and catalogs have been developed. Those of us who are amateur astr ...
Constellation
In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU). These areas had their origins in Western-traditional asterisms from which the constellations take their names. There are 88 officially recognized constellations, covering the entire sky.Thus, any given point in a celestial coordinate system can unambiguously be assigned to a constellation. It is usual in astronomy to give the constellation in which a given object is found along with its coordinates in order to convey a rough idea in which part of the sky it is located. For example, saying the Horsehead Nebula is near Orion's Belt in the constellation Orion immediately locates it just south of the ecliptic and conveys that it is best observable in winter from the Northern Hemisphere.