There are, for example, 273 Cepheid variables, 186 RR Lyr variables, 108 Delta Scuti variables, and 917 eclipsing binary stars.

The bar is delineated by red-clump stars ( see also red giant ), however, RR Lyr variables do not trace a prominent Galactic bar.

The " RR Lyr gap " in the HB between about B-V = 0. 1 and B-V = 0. 4 is not real ; stars exist in the Star cluster | cluster that would be plotted in this region, but they are Variable_star | variable stars which were inadequately characterized to be included in the tables from which this figure was made.

Different globular clusters often display different HB morphologies, by which is meant that the relative proportions of HB stars existing blue of the RR Lyr gap, within the gap, and to the red of the gap varies sharply from cluster to cluster.

Sketch of the Sacramento Valley Railroad ( 1852-1877 ) | Sacramento Valley RR as provided by its engineer, Theodore Judah.

The Beetle is widely used in drag racing ; its rearward ( RR layout ) weight distribution keeps the weight over the rear wheels, maximizing grip off the starting line.

The Milwaukee Road, officially the Chicago, Milwaukee, St. Paul and Pacific Railroad ( CMStP & P RR ), was a Class I railroad that operated in the Midwest and Northwest of the United States from 1847 until 1980, when its Pacific Coast Extension was embargoed through the states of Montana, Idaho, and Washington.

Old Pasadena is now a designated historic district of the Pasadena Charter defined by its boundaries 1 ) to the North, Holly Street from Fair Oaks Avenue to Arroyo Parkway ; 2 ) on the East, Arroyo Parkway south to Green Street, jogging one half block west to the old Santa Fe RR right-of-way and continuing 3 ) South to encompass the Old Train Station and Central Park, then north on Fair Oaks to De Lacey Street, then west to Pasadena Blvd.

In October 1849 the SER acquired the newly completed Reading, Guildford and Reigate Railway ( RG & RR ) line, which the LB & SCR regarded as a major incursion into its territory.

From Norristown, the P & W RR connected its tracks with the Lehigh Valley Transit Liberty Bell Route to provide direct electric train service from 69th St. Terminal to Allentown, Pennsylvania.

The Erie RR, owned by the Van Sweringens, could not afford the electric transfer and continued to use its own nearby station until 1948, when it replaced steam with diesel locomotives and was able to serve the Union Terminal under its own power.

The major exception is Porsche, who have developed the 911 for over 40 years and have taken advantage of the benefits of RR while mitigating its drawbacks to acceptable levels, lately with the help of electronic aids.

Another manufacturer to implement the RR configuration was the De Lorean Motor Company with its DMC-12 sports car.

) The Ariel Atom, a high performance sports car, uses an RR layout as a result of its " exoskeletal " design.

M71 was long thought ( until the 1970s ) to be a densely packed open cluster and was classified as such by leading astronomers in the field of star cluster research due to its lacking a dense central compression, and its stars having more " metals " than is usual for an ancient globular cluster ; furthermore, it's lacking the RR Lyrae " cluster " variable stars that are common in most globulars.

The shops were completed four years later, with their imposing brick architecture, they were the largest railroad shops in America, and unlike most railroads, allowed the Reading to make its own engines. They still stand today in non RR use.

* If the neighbours route is not valid ( which is indicated by the reflection bit ) or the RR flag was unset, the node only updates the entry of the neighbours node in its table.

It originally had a stone portal on its eastern ( RR North ) end and a natural stone portal at its western ( RR South ) end, but about 1919 the north portal was replaced with a concrete one.

The company operated as an independent railroad from its founding in 1872 until it was sold in foreclosure proceedings to the Denver Leadville & Gunnison RR in 1889. Its lines later became part of the Colorado and Southern Railway.

From its beginning, the RG & RR was worked by the South Eastern Railway ( SER ), which bought the RG & RR in 1852.

The first railway to arrive in Gravesend was the Gravesend & Rochester Railway ( G & RR ) who had purchased the Thames and Medway Canal and its tunnel between Strood and Higham.

A Resource Record ( RR ) is the basic data element in the domain name system.

One sufficient condition for this to happen is that the ant's name, seen as a cyclic list, consists of consecutive pairs of identical letters ' LL ' or ' RR ' ( the term " cyclic list " indicates that the last letter may pair with the first one.

The original name was Sheep Dip, then changed to Stillwater, but because of a Stillwater, Minnesota on the Northern Pacific RR, the mail presented a problem.

However, according to the current RFC, RFC 4408, section 3. 1. 1, " An SPF-compliant domain name SHOULD have SPF records of both RR types.

; Wild Cards: An adaption of the novels of the same name, edited by George RR Martin.

The RW & O earned the name, according to Spike System's Webville & Hypertext RR, " Rotten Wood & Old Rusty Rails ".

In 1963, as the main club from Woluwe, White Star AC, merged with the famous RR de Bruxelles, becoming the RR White, Woluwe FC changed their name to White Star Woluwe FC, taking over the star of the former club's logo.

In May 2009, Chicago-based printer RR Donnelley tendered an unsolicited bid to purchase Quebecor World, which was rejected as the company emerged from creditor protection in July ( having changed its name back to " Worldcolor Press ").

An 1875 Atlas of Illinois gives the name as Hicks Mills, while an 1892 one gives it as Fielding, on the Chicago, Milwaukee & St. Paul RR.

The Danish Navy had 6 Søløven class torpedo boats ( the export version of the British Brave class fast patrol boat ) in service from 1965 to 1990 ) which had 3 Bristol Proteus ( later RR Proteus ) Marine Gas Turbines rated at combined, plus two General Motors Diesel engines, rated at, for better fuel economy at slower speeds.

RR Lyrae stars were recognized fairly early ( by the 1930s ) as being a separate class of variable, due in part to their short periods.

RR Lyraes are pulsating horizontal branch stars of spectral class A ( and rarely F ), with a mass of around half the Sun's.

From 1915 to the 1930s, the RR Lyraes became increasingly accepted as a class of star distinct from the Cepheids, due to their shorter periods, differing locations within the galaxy, and chemical differences from classical Cepheids, being mostly metal-poor, Population II stars.

One of the more notable series of narrow gauge locomotives built by Baldwin was the K-36 class Mikados of the Denver and Rio Grande Western RR.

These pulsating horizontal branch stars are known as RR Lyrae variable stars and they are obviously variable in brightness with periods of up to 1. 2 days

He discovered a secondary variation of the amplitude and period of some RR Lyrae stars and related pulsating variables, now known as the Blazhko effect.

Accurate knowledge of open cluster distances is vital for calibrating the period-luminosity relationship shown by variable stars such as cepheid and RR Lyrae stars, which allows them to be used as standard candles.

It is worth mentioning, however, as it served as the starting point for variable star designations, which start with " R " through " Z ", then " RR ", " RS ", " RT "..." RZ ", " SS ", " ST "..." ZZ " and beyond.

It is an Oosterhoff � type I cluster, and contains at least 59 variable stars, most of which are RR Lyrae variables.

RR Lyrae variables are periodic variable stars, commonly found in globular clusters, and often used as standard candles to measure galactic distances.

This type of variable is named after the prototype, the variable star RR Lyrae in the constellation Lyra.

* Animation with the variable stars RR Lyrae in the center area of the globular cluster M15

* M3 variable stars 2 night animation RR Lyrae at the globular cluster M3, 10min intervals.

es: Estrella variable RR Lyrae

105 stars in M5 are known to be variable in brightness, 97 of them belonging to the RR Lyrae type.

An accurate determination of the distance to the Galactic Center as established from variable stars ( e. g., RR Lyrae variables ) or standard candles ( e. g., red clump stars ) is hindered by countless effects, which include: an ambiguous reddening law ; a bias for smaller values of the distance to the Galactic Center because of a preferential sampling of stars toward the near side of the Galactic bulge owing to interstellar extinction ; and an uncertainty in characterizing how a mean distance to a group of variable stars found in the direction of the Galactic bulge relates to the distance to the Galactic Center.

This statistical parallax method is useful for measuring the distances of bright stars beyond 50 parsecs and giant variable stars, including Cepheids and the RR Lyrae variables.

The stellar population includes four Cepheids and RV Tauri variables, plus at least one RR Lyrae variable for which a period is known.

18 RR Lyrae type variable stars have been observed in this cluster.

From studies conducted in the 1970s it is known that M62 contains the high number of 89 variable stars, many of them of the RR Lyrae type.

It is an Oosterhoff type II ( OoII ) globular cluster, which means it belongs to the group of metal poor clusters with longer period RR Lyrae variable stars.

# Redirect RR Lyrae variable