Factbites
 Where results make sense
About us   |   Why use us?   |   Reviews   |   PR   |   Contact us  

Topic: Star (classification)


Related Topics

  
  Star (classification) - Wikipedia, the free encyclopedia
Stars are often used as symbols for classification purposes.
In particular, a set of one to five stars is employed to categorize hotels.
However, regardless of what public or private agency performs the classification, the term five star hotel is always associated with the ultimate luxury (and, by implication, expense).
en.wikipedia.org /wiki/Star_(classification)   (424 words)

  
 Star - Wikipedia, the free encyclopedia
Star formation begins with gravitational instability inside those clouds, often triggered by shockwaves from supernovae or the collision of two galaxies (as in a starburst galaxy).
The particle radiation emitted by a star is manifested as the stellar wind, which exists as a steady stream of electrically charged particles (such as free protons, alpha particles, and beta particles) emanating from the star’s outer layers and as a steady stream of neutrinos emanating from the star’s core.
The apparent brightness of a star is measured by its apparent magnitude, which is the brightness of a star with respect to the star’s luminosity, distance from Earth, and the altering of the star’s light as it passes through Earth’s atmosphere.
en.wikipedia.org /wiki/Star   (2911 words)

  
 Star
As learned by star formation astronomers, stars are born in molecular clouds, regions of higher density of matter, and form by gravitational instability inside those clouds.
There are different classifications of stars ranging from type O which are very large and bright, to M which is often just large enough to start ignition of the hydrogen.
Most stars fall into the main sequence which is a description of stars based on their absolute magnitude and spectral type.
www.ebroadcast.com.au /lookup/encyclopedia/st/Star.html   (719 words)

  
 Major Stars and Star Systems - Zoom Astronomy
Aldebaran is the brightest star in the constellation Taurus (it is one of the bull's eyes) and is the 13th brightest star in the sky.
(Alpha Boötis) Arcturus is the brightest star in the constellation Boötes (the herdsman).
Rigel (beta Orionis) is the brightest star in the constellation Orion and one of the brightest stars in the sky.
www.enchantedlearning.com /subjects/astronomy/stars/majorstars.shtml   (1303 words)

  
 eSky: Spectral Classification
The classification of stars according to their spectra; each major spectral classification is given a letter, with additional numbers providing further subdivisions.
Stars of this type are blue in colour and burn hotly, with surface temperatures lying between 11,000 K and 25,000 K.
K-type stars are orange in colour, and among the brightest in the sky are Arcturus (K2), Aldebaran (K5), Pollux (K0) and Atria (K2).
www.glyphweb.com /esky/concepts/spectralclassification.html   (1065 words)

  
 World Almanac for Kids
Giant stars are usually diffuse, however, and may be only 40 times more massive than the sun, whereas white dwarfs are extremely dense and may have masses about 0.1 times that of the sun despite their small size.
The birth of stars is intimately connected with the presence of dust grains and molecules, as in the Orion nebula region of earth’s galaxy.
Stars are generally born in small groups at one edge of a large molecular cloud.
www.worldalmanacforkids.com /explore/space/star.html   (3216 words)

  
 O Star Atlas - Notes
11072-5952 = HD 96670 : The classification and SB1 orbit are from Garcia (1994).
Classifications of the B and C components are from Lindroos (1985); the C component classification is photometric.
22021+5800 = HD 209481 (LZ Cep) : The classification is from Conti & Alschuler (1971).
www.chara.gsu.edu /CHARA/DoubleStars/Ostars/notes.html   (4332 words)

  
 Star Spectral Classification
Stars can be classified by their surface temperatures as determined from Wien's Displacement Law, but this poses practical difficulties for distant stars.
O-Type stars are very massive and evolve more rapidly than low-mass stars because they develop the necessary central pressures and temperatures for hydrogen fusion sooner.
Because of their early development, the O-Type stars are already luminous in the huge hydrogen and helium clouds in which lower mass stars are forming.
hyperphysics.phy-astr.gsu.edu /hbase/starlog/staspe.html   (409 words)

  
 How To Decipher Those Classification Codes
Pulsating stars belonging to the galactic disc (Population I).
KW = primary is a yellow main-sequence star, secondary is a hotter subdwarf.
Stars mistakenly thought to be variable (very common in the early days of photographic surveys!).
www.assa.org.au /sig/variables/classifications.asp   (1860 words)

  
 Star Classification - Zoom Astronomy
These stars will eventually explode (becoming a planetary nebula or supernova, depending on their mass) and then become white dwarfs, neutron stars, or fl holes (again depending on their mass).
A brown dwarf is a "star" whose mass is too small to have nuclear fusion occur at its core (the temperature and pressure at its core are insufficient for fusion).
X-ray binary stars are a special type of binary star in which one of the stars is a collapsed object such as a white dwarf, neutron star, or fl hole.
www.enchantedlearning.com /subjects/astronomy/stars/startypes.shtml   (1144 words)

  
 Actor Network Theory and Classification
The negotiated nature of standards and classifications follows from indeterminacy and multiplicity that whatever appears as universal or, indeed, standard, is the result of negotiations or conflict.
All classification and standardization schemes are a mixture of physical entities such as paper forms, plugs, or software instructions encoded in silicon and conventional arrangements such as speed and rhythm, dimension, and how specifications are implemented.
Classifications include types of objects, types of hardware, matches between requirements categories and code categories, and meta-categories such as the goodness of fit of the piece of code with the larger system under development.
epl.scu.edu:16080 /~gbowker/actnet.html   (8911 words)

  
 Articles - Hotel Rating Seeks to End Star Lottery
The country's leading hotels may have been known by their four or five stars for years, but it was not until last week that certificates of the first unified national hotel classification system were awarded.
Under the new system, classifications are awarded on the recommendation of a special department tourism committee, and for the first time representatives of the major international hospitality companies are an integral part of the process.
In keeping with their previous star ratings, the National, Baltschug Kempinski and the Golden Ring were awarded five stars and the President Hotel was demoted from five to four stars.
www.ey.com /global/content.nsf/Russia_E/Articles_-_Hotel_Rating_Seeks_to_End_Star_Lottery   (1244 words)

  
 Star classification - Scientia Astrophysical Organization
In astrophysics, stars are classified by their surface temperature, that is associated to specific spectral patterns.
M stars may be dwarf stars or supergiant stars, and A stars can be white dwarfs or white giants as well.
The Sun is not in fact a yellow star, but has the color temperature of a body of 5780 K, that is a white with no trace of yellow which is sometimes used as a definition for standard white.
www.astrophysical.org /starclassification.php   (882 words)

  
 UCIP Star Trek Simulations - Planet Classifications   (Site not responding. Last check: 2007-10-13)
Usually found in a star's "habitable zone." They have high surface temperatures due to the "greenhouse effect" caused by their dense atmospheres.
Usually found in a star's "habitable zone." They are adaptable for humanoid colonization through the use of pressure domes and other life support devices.
Usually found in a star's "habitable zone" or "cold zone." Low solar radiation and minimal internal heat usually result in a frozen atmosphere.
www.ucip.org /miscellaneous/planets.html   (607 words)

  
 All-Star
All-Star / A Leagues must register all teams within the league ages 4U -18U, not a portion of or a division of, for the league to be eligible to award USSSA All-Star / A State Championship Tournament and / or USSSA All-Star World Series berths.
All-Star / A Leagues may draft, choose or pick All-Star team(s) players by any means, system or format approved by the All-Star / A League Board of Directors or Chief Officer as long as such method is used consistently age division by age division throughout the All-Star / A League.
When an All-Star team qualifies for a USSSA All-Star World Series, the team roster will be frozen immediately and all players on the team’s Official All-Star Team Roster will be bound to the qualified All-Star team for the remainder of the current season year (July 31st).
www.iowausssa.com /All-Star.htm   (1257 words)

  
 [No title]
Background: The History And Nature Of Spectral Classification Patterns of absorption lines were first observed in the spectrum of the sun by the German physicist Joseph von Fraunhofer early in the 1800’s, but it was not until late in the century that astronomers were able to routinely examine the spectra of stars in large numbers.
Stars with strong lines of ionized helium (HeII), which were called O stars in the Harvard system, were the hottest, around 40,000 o K, because only at high temperatures would these ions be present in the atmosphere of the star in large enough numbers to produce absorption.
The spectral classification system used today is a refinement called the MK system, introduced in the 1940’s and 1950’s by W. Morgan and P.C. Keenan at Yerkes Observatory to take account of the fact that stars at the same temperature can have different sizes.
www.rit.edu /~jrksps/courses/301/Spectra.doc   (8608 words)

  
 Stars and Beyond   (Site not responding. Last check: 2007-10-13)
Stars appear to the naked eye as spiky, twinkling lights or scintillation, especially at night.
The spikiness of star images is due to optical effects in the observer's eyes.
A star’s spectrum is caused by the temperature in the outer layers of the star.
www.msnucleus.org /membership/html/jh/earth/stars/lesson1/stars01c.html   (182 words)

  
 The Webfooted Astronomer: Secrets of the Harvard Classification Revealed
WN - Wolf-Rayet stars with an overabundance of nitrogen
B - Temperature range is 13,000 K to 20,000 K. These stars exhibit a bluish—white color and show the spectra of neutral helium, ionized silicon, ionized oxygen and ionized magnesium.
R and N stars are sometimes combined into one class: C. Stars of class S exhibit complex spectra containing bright hydrogen lines and molecular bands due to zirconium oxide.
www.seattleastro.org /webfoot/feb00/pg2.htm   (767 words)

  
 STAR LIGHT, STAR BRIGHT : EXPLORING HOW STARS ARE CLASSIFIED
Our sun is an average star among numerous other stars in the universe.
Close by reinforcing how much they learned about stars yesterday and behaved much like scientists in the 1800s who used similar information to create a diagram that has helped astronomers learn much about the properties of stars.
Extension: Have students research the scientists who were involved in the early data collection and analysis of stars in the 1800s.
www.scienceteacherprogram.org /astronomy/DeMizio02.html   (818 words)

  
 Accommodation ratings for hotels, guesthouses, camping parks and more - Enjoy England
Star ratings symbolise the level of service, range of facilities and quality of guest care that you can expect.
One Star: Practical accommodation with a limited range of facilities and services, but a high standard of cleanliness throughout.
Campus accommodation includes educational establishments such as universities and colleges with sleeping accommodation in halls of residence of student village complexes.
www.enjoyengland.com /corporate/ratings.aspx   (1396 words)

  
 [No title]
Note that going to a different universe can get you starflight, if there are stars in the other universe, without the FTL paradoxes.
The classifications are completely on how they appear; not on the actually physics of operation.
EMF classification: "Type I; hyperdrive: The ships enters some different space during the trip, whether or not time passes for the crew while in this space." [2.2.2.1] HYPERSPACE WITH FIXED NODES Like teleport systems, a alternative space drive may require a fixed station.
www.projectrho.com /stardrv.txt   (2747 words)

  
 Amazon.com: Sorting Things Out: Classification and Its Consequences (Inside Technology): Books: Geoffrey C. ...   (Site not responding. Last check: 2007-10-13)
Classification theory is tough reading, but this is an important book that expounds the basics in a new fashion.
Bowker and Star, both professors in the department of communication at the University of California, San Diego, emphasize (and show how) classification becomes invisible as it gains acceptance and exerts ever greater influence over our daily lives.
They explore three issues: the role of classification in large infrastructures; classification and biography; and classification and work practice.
www.amazon.com /exec/obidos/tg/detail/-/0262522950?v=glance   (1525 words)

  
 Appalachian State University Nstars Spectra Project
Also, as required by the classification process (but not specifically the NStars project) MK Standards are available through this site.
These standards were obtained with the telescopes and spectrographs utilized for this project, and may not be appropriate for all uses.
Paper 1: Contributions to the Nearby Stars (NSTARS) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs.
stellar.phys.appstate.edu   (331 words)

  
 Our Sun   (Site not responding. Last check: 2007-10-13)
The Sun is the nearest star to us, which is both an advantage and a disadvantage for astronomers who study stars.
Since the Sun is very close, and very bright, we know much more about the Sun than we know about other distant stars.
But all of the phenomena associated with the Sun are occuring on other stars, so understanding the Sun's behavior provides insights to how other stars might behave.
ganymede.nmsu.edu /astro/a110labs/labmanual/node12.html   (3859 words)

  
 Astronomy - What is the origin of the letters used in star classification? Why didn't astronomers use ABCD? - J. ...
Astronomy - What is the origin of the letters used in star classification?
What is the origin of the letters used in star classification?
But as astronomers observed more stars and obtained more detailed spectra, they consolidated some categories and re-ordered the remaining ones.
www.astronomy.com /asy/default.aspx?c=a&id=3494   (200 words)

Try your search on: Qwika (all wikis)

Factbites
  About us   |   Why use us?   |   Reviews   |   Press   |   Contact us  
Copyright © 2005-2007 www.factbites.com Usage implies agreement with terms.