Classical Cepheids, Type II Cepheids, RR Lyrae variables and Delta Scutis belong to the instability strip which is believed to be driven by Eddington pulsations in helium, while for the Beta Cepheids the pulsation mechanism is unknown.

Classical Cepheids ( or Delta Cephei variables ) are population I yellow supergiants which undergo pulsations with very regular periods on the order of days to months.

Cepheid variables are divided into several subclasses which exhibit markedly different masses, ages, and evolutionary histories: Classical Cepheids, Type II Cepheids, Anomalous Cepheids, and Dwarf Cepheids.

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.

Classical Cepheids are used to determine distances to galaxies within the Local Group and beyond, and are a means by which the Hubble constant can be established.

Classical Cepheids have also been used to clarify many characteristics of our galaxy, such as the Sun's height above the galactic plane and the Galaxy's local spiral structure.

Classical Cepheids are younger and more massive population I stars, whereas Type II Cepheids are older fainter population II stars.

Classical Cepheids and Type II Cepheids follow different period-luminosity relationships.

These unresolved matters have resulted in cited values for the Hubble constant ( established from Classical Cepheids ) ranging between 60 km / s / Mpc and 80 km / s / Mpc.

* Classical Cepheids include: Eta Aquilae, Zeta Geminorum, Beta Doradus, RT Aurigae, Polaris, as well as the namesake Delta Cephei.

Classical Cepheids discovered in the heavily-obscured dust lane of NGC 5128 yield a distance between ~ 3-3. 5 Mpc, depending on the nature of the extinction law adopted and other considerations.

Allomorphy can also exist in stems or roots, as in Classical Sanskrit:

According to Kapila Vatsyayan, " Classical Indian architecture, sculpture, painting, literature ( kāvya ), music, and dancing evolved their own rules conditioned by their respective media, but they shared with one another not only the underlying spiritual beliefs of the Indian religio-philosophic mind, but also the procedures by which the relationships of the symbol and the spiritual states were worked out in detail.

Classical methods ( also known as wet chemistry methods ) use separations such as precipitation, extraction, and distillation and qualitative analysis by color, odor, or melting point.

It has been described as the single most important and influential work in the West on Medieval and early Renaissance Christianity, and is also the last great Western work that can be called Classical.

Claudius also tried to revive the old custom of putting dots between successive words ( Classical Latin was written with no spacing ).

Classical liberals were also divided on free trade.

Classical education in this period also did not teach local languages and cultures.

Classical guitars also known as Spanish guitars are typically strung with nylon strings, plucked with the fingers, played in a seated position and are used to play a diversity of musical styles including classical music.

Classical authors also attributed to Hesiod a lengthy genealogical poem known as Catalogue of Women or Ehoiai ( because sections began with the Greek words ē hoiē, " Or like the one who ...").

In the Life Niese follows mainly manuscript P, but refers also to AMW and R. Henry St. John Thackery for the Loeb Classical Library has a Greek text also mainly dependent on P. André Pelletier edited a new Greek text for his translation of Life.

Classical Latin Arcturus would also have become Art ( h ) ur when borrowed into Welsh, and its brightness and position in the sky led people to regard it as the " guardian of the bear " ( which is the meaning of the name in Ancient Greek ) and the " leader " of the other stars in Boötes.

Classical music is also well known in Kosovo and has been taught at several music schools and universities ( at the University of Prishtina Faculty of Arts in Pristina and the University of Priština Faculty of Arts at Kosovska Mitrovica ).

A number of other ancient languages also used quantitative metre, such as Sanskrit and Classical Arabic ( but not Biblical Hebrew ).

During the Baroque and Classical periods, recitative could appear in two basic forms: secco ( dry ) recitative, accompanied only by continuo, which was usually a harpsichord and a cello ; or accompagnato ( also known as strumentato ) in which the orchestra provided accompaniment.

By the Classical period, the races were run by ephebes also in honor of Hephaestus and Athena.

Tetrahydrobiopterin is also a cofactor in the production of L-DOPA from Tyrosine and 5-Hydroxy-L-Tryptophan from Tryptophan, which must also be supplemented as treatment in addition to the supplements for Classical PKU.

Classical mechanics has also been extended into the complex domain, with complex classical mechanics exhibiting behaviors similar to quantum mechanics.

He also appears as a member of the jazz combo the Classical Jazz Quartet.

The Sony Classical release also featured an interactive CD-ROM component and website that complemented the work.

Samuel is also treated by the Classical Rabbis as a much more sympathetic character than he appears at face value in the Bible ; his annual circuit is explained as being due to his wish to spare people the task of having to journey to him ; Samuel is said to have been very rich, taking his entire household with him on the circuit so that he didn't need to impose himself on anyone's hospitality ; when Saul fell out of God's favour, Samuel is described as having grieved copiously and having prematurely aged.

Classical SH3 domains are restricted in humans to intracellular proteins, although the small human MIA family of extracellular proteins also contain a domain with an SH3-like fold.

** Classical Kuiper belt objects ( also called cubewanos ) have no such resonance, moving on almost circular orbits, unperturbed by Neptune.

He also wrote books of literary criticism, in particular Wordsworth ( 1881 ) and Essays, Classical and Modern ( in two volumes, 1883 ), which included a highly-regarded essay on Virgil.

Thus, while it remains possible that the Babylonians and/or the Pythagoreans may perhaps have had the magic square of three before the Chinese did, more definite evidence will have to turn up from the Middle East or the Classical World before China can lose her claim to the earliest known magic square by more than a thousand years.

Vipsania Agrippina or most commonly known as Agrippina Major or Agrippina the Elder ( Major Latin for the elder, Classical Latin:, 14 BC – 17 October 33 ) was a distinguished and prominent Roman woman of the first century AD.

Julia Agrippina, most commonly referred to as Agrippina Minor or Agrippina the Younger, and after 50 known as Julia Augusta Agrippina ( Minor Latin for the ‘ younger ’, Classical Latin: ;, 7 November 15 or 6 November 16 – 19 / 23 March 59 ) was a Roman Empress and one of the more prominent women in the Julio-Claudian dynasty.

Classical Arab music is extremely popular across the population, especially a small number of superstars known throughout the Arab world.

In the middle of the 18th century, Europe began to move toward a new style in architecture, literature, and the arts, generally known as Classicism, which sought to emulate the ideals of Classical antiquity and especially those of Classical Greece.

* Classical or Angkor Wat Style ( 1080 – 1175 ): Angkor Wat, the temple and perhaps the mausoleum of King Suryavarman II, is the greatest of the Angkorian temples and defines what has come to be known as the classical style of Angkorian architecture.

Guitarist Christopher Parkening is quoted in the book Classical Gas: The Music of Mason Williams as saying that it is the most requested guitar piece besides Malagueña and perhaps the best known instrumental guitar piece today.

The clavichord is a European stringed keyboard instrument known from the late Medieval, through the Renaissance, Baroque and Classical eras.

In the written style known as kanbun, which is the Japanese approximation of Classical Chinese, small marks called kunten are sometimes added as reading aids.

Early in Classical Greece, that the earth is a sphere (" round "), was generally known by all, and around 240 BCE, Eratosthenes ( 276 BCE – 194 BCE ) accurately estimated its circumference.

Iraq, known in Classical Antiquity as Mesopotamia, was home to the oldest civilizations in the world, with a cultural history of over 10, 000 years, hence its common epithet, the Cradle of Civilization.

John Locke FRS (; 29 August 1632 – 28 October 1704 ), widely known as the Father of Classical Liberalism, was an English philosopher and physician regarded as one of the most influential of Enlightenment thinkers.

Among his best known works are the series Ten Studies in Female Physiognomy ; A Collection of Reigning Beauties ; Great Love Themes of Classical Poetry ( sometimes called Women in Love containing individual prints such as Revealed Love and Pensive Love ); and Twelve Hours in the Pleasure Quarters.

Princeton Encyclopedia of Classical Sites, 1976, Includes alphabetized list of known wreck sites from Classical Antiquity.

The connection to the Nile River was made not simply because this was then known as the great river of " Aethiopia " ( by which all lands south of the desert were called by Classical writers ), but because the Nile flooded every summer.

Aside from a few fragments, the mathematics of Classical Greece is known to us either through the reports of contemporary non-mathematicians or through mathematical works from the early Hellenistic period.

In the Classical period, moreover, several of the books ( individually and in groups ) were given their own titles: the first four books, focusing on Telemachus, are commonly known as the Telemachy.

In Classical times, many of the great thinkers and political leaders performed their works before an audience, usually in the context of a competition or contest for fame, political influence, and cultural capital ; in fact, many of them are known only through the texts that their students, followers, or detractors wrote down.