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	Delta Cephei star
		Such stars are massive (5 to 20 solar masses) Population I objects of high luminosity that undergo very regular pulsations, with periods of 1 to 135 days.
		Accompanying these pulsations are changes in brightness, with amplitudes of 0.1 to 2 magnitudes, and in spectral type, typically from F at maximum to G or K at minimum.
		Delta Cephei stars occupy a region of the Hertzspung-Russell diagram known as the instability strip; having started life as hydrogen-burning B stars they are now in a post-main-sequence phase marked by instability to radial pulsation.
	www.daviddarling.info /encyclopedia/D/Delta_Cephei_star.html (212 words)

	AAVSO: Delta Cep, September 2000 Variable Star Of The Month
		Delta Cephei is the prototype of the Cepheid class of variable stars.
		Investigation of delta Cep's heavenly position shows that the variable conveniently sits between two bright stars that shine at either end of its range of variability: zeta Cep at a magnitude of 3.6 and epsilon Cep at a magnitude of 4.2.
		Delta Cep is a terrific "starter" variable star for the amateur astronomer looking a place to begin, or for the student seeking a research project for math and science courses.
	www.aavso.org /vstar/vsotm/0900.stm (3768 words)

	Delta Cephei (Site not responding. Last check: 2007-10-13)
		It was actually the second Delta Cephei Star, or Cepheid variable, to be discovered; the first one, Eta Aquilae, had been discovered earlier the same year by Goodricke's good friend, neighbor and collaborator Edward Pigott.
		Delta Cephei varies with a period of 5.366341 days (or 5 days 8 hours 37.5 minutes) from magnitude 3.48, spectral type F5 in its maximum to mag 4.37, spectral type G2 in its minimum.
		Delta Cephei is an easily separable double star in an amateur telescope; its companion "C" of mag 7.5, spectrum A0 was discovered by F.W.G. Struve in 1835.
	www.seds.org /~spider/spider/Vars/deltaCep.html (288 words)

	Delta Cephei (Site not responding. Last check: 2007-10-13)
		Delta Cephei is one of the most significant variable stars, the prototype of what are called "Cepheid variables".
		To find delta Cephei it will be first be easier to hop from another star, mu Cephei, the star that William Herschel so enthused over for its particular shade of red that he named it the Garnet Star.
		Delta Cephei is due east of mu Cephei; first you'll come to zeta.
	www.dibonsmith.com /cep_d.htm (261 words)

	Visual Photometry of Variable Stars
		We may determine the class of variable star to which delta Cephei belongs, and if its variation is periodic, we may determine the period.
		Delta Cephei may be easily located by means of a small isosceles triangle between Deneb (alpha Cygnus, or alpha Cyg) and Cassiopela.
		Brightness ratings for delta should be estimated with respect to epsilon (as the brightest) and zeta (as the dimmest).
	www.phys-astro.sonoma.edu /courses/a231/DelCep_observations.html (784 words)

	Delta Cep (Site not responding. Last check: 2007-10-13)
		The term "supergiant" is apt, as at a distance of around 300 light years the star pours an average of 2000 solar luminosities into space from a surface swollen to some 40 solar diameters.
		Delta Cephei does not pulse in lonely splendor, but has a 6th magnitude (6.3) class B (probably B7) 500 solar-luminosity companion 41 seconds of arc away.
		Watching Delta vary by over a full magnitude from the companion would be a fascinating sight, not there would be anybody to watch, the stars being much too youthful to have any life on any planets that are probably not there in the first place.
	www.astro.uiuc.edu /~kaler/sow/deltacep.html (432 words)

	Imago Mundi - Delta Cephei.
		Delta Cephei est une étoile variable pulsante dont la magnitude évolue entre 3,44 et 4,27, sur une période de 5 jours 8 heures 48 minutes, du fait de fluctuations régulières du volume de son enveloppe.
		Delta Cephei constitue le prototype de la grande famille des céphéides, des étoiles géantes variables à pulsations de population I (c'est-à-dire de la génération du Soleil).
		Delta Cephei est, par ailleurs, une étoile binaire
	www.cosmovisions.com /cep01.htm (187 words)

	Facilities-IUCAA Observing Programme
		Now it has been fairly established that the cause of the light variation of delta Cepheid stars are radial pulsation of the star outer envelope.
		Delta Cepheid stars rhythmically breathing in and out, becoming alternately brighter and dimmer in the process.
		The changes in the brightness primarily due to the 1000-1500 K variation in the surface temperature, the accompanying changes in size makes a less contribution to the luminosity.
	www.iucaa.ernet.in /html/facilities_meadetelescope_Cepheidvariables.htm (395 words)

	Cepheus
		Delta Cephei is a fixed double, a yellow giant with blue companion: 3.8, 7.5; PA 191º, separation 41".
		Xi Cephei is considered to be the most attractive binary in Cepheus, a blue-white primary and yellow (or reddish) companion that orbits every 3800 years: 4.4, 6.5; PA 275º, separation 8.2".
		Delta Cephei is also the prototype of a class of variables.
	www.dibonsmith.com /cep_con.htm (1310 words)

	Delta Cephei - Wikipedia
		Delta Cephei ist ein gelber Überriese, der sich in einer Entfernung von 1200 Lichtjahren von der Sonne befindet.
		Delta Cephei ist der Prototyp einer Klasse von pulsationsveränderlichen Sternen, den sogenannten Delta-Cephei-Sternen, die - da ihre Periodendauer nur von der Leuchtkraft abhängt - bei der Entfernungsmessung von Galaxien eine Rolle spielt.
		Delta Cephei ist nicht nur ein bekannter Veränderlicher, er ist auch ein schon im Prismenfernglas trennbarer Doppelstern.
	de.wikipedia.org /wiki/Delta_Cephei (135 words)

	Delta Scuti (Site not responding. Last check: 2007-10-13)
		Modest Delta Scuti (in Scutum, the Shield), shining only at 5th magnitude (4.71) in a relatively obscure modern constellation best known for its placement in the Milky Way, stands out as the prototype of one of these, the pulsating "Delta Scuti stars," of which
		Delta Scuti has stopped fusing hydrogen in its core, and will shortly be on its way to becoming a true, much larger red giant.
		Delta's chief period is 4.65 hours, while the secondary is 4.48 hours.
	www.astro.uiuc.edu /~kaler/sow/deltasct.html (515 words)

	Radio Khartoum : The Soft Rains of Delta Cephei
		Delta Cephei is a double star which can be easily separated using a small telescope.
		The variability of Delta Cephei was discovered in 1784 by John Goodricke, who unfortunately caught pneumonia while making his observations, and died at the tender age of twenty-one.
		The Soft Rains of Delta Cephei is the fifth volume of the 18fps series, a collection of imaginary soundtracks under the curatorship of Radio Khartoum.
	www.radiokhartoum.com /p-sheets/khz401.htm (889 words)

	WAS - Delta Cephei
		Delta Cephei is a naked eye star in the Constellation Cephus.
		The poor weather and light pollution made Delta Cephei difficult to see sometimes and on some occasions the fainter comparison star was not visible.
		For our measurement of the period this gives an absolute magnitude of -3.41; in other words if Delta Cephei was at a distance of 10 Parsecs (32.6 light years) it would have a magnitude of -3.41 and so be the brightest object in the night sky, except the Moon and sometimes Venus.
	wycombeastro.org.uk /deltacephei.shtml (504 words)

	Delta Cephei
		The second Cepheid variable to be identified and the prototype for the category known as Type I Cepheids, or Delta Cephei stars.
		With a change in apparent magnitude of 3.5 to 4.4 over a period of 5.366 days, Delta Cep’s entire range of variability can be followed with the naked eye.
		At a declination of +58°, Delta makes a perfect target for northern observers, especially those who see Cepheus as a circumpolar constellation.
	www.daviddarling.info /encyclopedia/D/Delta_Cephei.html (240 words)

	delta Cephei Observing Project
		By the end of March you should have collected at least 10-15 visual observations of delta Cephei's brightness relative to two nearby stars: zeta and epsilon Cephei.
		Your brightness measurements of delta Cep should be on an arbitrary scale from 0 to 10 where a brightness equal to epsilon Cep (the fainter star) is considered 0 and a brightness equal to zeta Cep is 10.
		Basic info on delta Cep including epoch of maximum light, period, known range of brightness in magnitudes and known type of variable star.
	www.umanitoba.ca /science/astronomy/cbrown/16207/delceppj.htm (782 words)

	Nov. Objects
		DELTA CEP 22 29.2 +58.5 4/6.5 41 192 O/B
		Delta Cephei - prototype of the important class of variable stars called Cepheid Variables.
		Delta Cephei varies in brightness from mag 3.9 to 5.09 over a period of precisely 5.366341 days.
	www.twcac.org /Whatsup/wu11.htm (276 words)

	HOA - Activity: Observing Delta Cephei
		From most latitudes in the northern hemisphere in the autumn, delta Cephei is bright and high in the sky - away from the horizon and local light pollution.
		Enter in your logbook the name of the star (delta Cephei), the date of the observing session, and the hour (later you will enter the minutes to the nearest quarter hour).
		Here is delta Cephei and its comparison stars, zeta Cephei (magnitude 3.6) and epsilon Cephei (magnitude 4.2).
	hoa.aavso.org /deltacephei.htm (497 words)

	Variable Stars
		Cepheid variables are named after the star Delta Cephei, the fourth brightest star in the constellation Cepheus.
		The luminosity of Delta Cephei varies by a factor of two, with a period of 5 days.
		The fluctuations about the average luminosity can be large (as in the case of Delta Cephei) or small (as in the case of Polaris, where the fluctuations are too small to be detected with the naked eye.
	www.stormpages.com /swadhwa/stellarevolution/lecture17.htm (956 words)

	Cepheids and their 'cocoons'
		The southern Cepheid L Carinae was observed with the VINCI and MIDI instrument at the VLTI, while Polaris (the Pole Star) and Delta Cephei (the prototype of its class) were scrutinised with FLUOR on CHARA, located on the other side of the equator.
		Delta Cephei is the prototype of the Cepheids.
		It was discovered to be a variable star in the 18th century by the English amateur John Goodricke, and it is still one of the brightest members of the Cepheid class.
	www.physorg.com /news11266.html (869 words)

	ASP: Star Science in the Autumn Sky
		Using a period of 5.4 days, calculate the phases of the Delta Cephei measurements.
		Based on the past behavior of the Delta Cephei, the maximum brightness occurs on the following dates for the upcoming months.
		The maximum brightness of Delta Cephei occurs at the Julian dates 2449722.05 + 5.366269 N, where N is an integer.
	www.astrosociety.org /education/publications/tnl/32/starscience4.html (692 words)

	CEPHEUS
		Gamma Cephei(Er Rai) This is a magintude 3.21 star.
		This star is 5.2 times the size of the sun and 10 times as bright.
		Delta Cephei This is a magintude 3.75 star.
	members.tripod.com /AlphaCnt/ceph.html (93 words)

	Cepheid Variable Stars
		Analysis of the spectrum of delta Cephei suggests that along with the variation in brightness there is a velocity of somewhat over 20 km/s associated with the orbit, a swing in temperatre between 5500 K and about 6600 K, and a change in diameter of about 15% (Kaufmann).
		Named 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.
		Cepheid variable stars have proved to be one of the most valuable methods for distance determination because their period of variability has been shown to be related to their absolute luminosity by a period-luminosity relationship.
	hyperphysics.phy-astr.gsu.edu /hbase/astro/cepheid.html (394 words)

	CANOPUS 97/11 - Distance of Delta Cephei (Site not responding. Last check: 2007-10-13)
		The first Cepheid variable star to be discovered was the star Delta (the fourth brightest star in the constellation Cepheus).
		The distance of Delta Cephei is, therefore, 338.8 parsecs.
		When the 95% confidence limits are applied, it works out that the distance of Delta Cephei lies between 930 and 1250 light years.
	www.aqua.co.za /assa_jhb/Canopus/c97bevz.htm (1151 words)

	Messier Object 25
		It was discovered by J.B. Irwin in 1956, its membership was confirmed by radial velocity measurements conducted by M.W. Feast of Radcliffs Observatory (the common RV of the cluster members is +4 km/sec).
		The occurance of the Delta Cephei star is consistent with the fact that it is not a very young cluster, its age may be about 90 million years (the Sky Catalog 2000 gives 89 million).
		Also, as the distance of M25 is quite wellknown by other means, U Cephei can by used as one gauging point of the famous, so-called Cepheid distance scale, which is used for distance determinations of nearby galaxies.
	www.seds.org /messier/m/m025.html (420 words)

	Constellations: Cepheus, King of Ethiopia
		Located between Cassiopeia and Cygnus, Cepheus represents a robed king with a crown of stars, his left foot planted over the north celestial pole and his sceptre pointing towards his queen, Cassiopeia.
		The constellation gave rise to the name of the 'standard' stars used in estimating the distances of other stars in the same region, the Cepheid Variables, named after delta cephei, the first such star discovered.
		Principal stars are Alderamin (Alpha Cephei), magnitude 2.4; Alfirk - The Flock (Beta Cephei), magnitude 3.2; Errai - The Shepherd (Gamma Cephei); The Garnet Star (Mu Cephei); variable, magnitude -3.4 to -5.1 and Delta Cephei, the archetypal Cepheid variable, magnitude -3.5 to -4.4.
	www.r-clarke.org.uk /constellations/cepheus.htm (233 words)

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