Cepheids are important in astronomy because they are used as standard candles – objects with known luminosities – to measure distances. Polaris Aa is a low-amplitude Cepheid and, being the nearest such star to Earth, it has been a frequent object of study. In 1929, a study of the star’s spectrum revealed that Polaris was in fact two stars in a tight orbit, confirming an earlier theory that the main component was a binary star. Polaris (Alpha Ursae Minoris), image: Wikisky It was the first variable star of its type to have its mass calculated from its orbit. It is 1,260 times more luminous than the Sun with a surface temperature of about 6,000 K. It is a supergiant star with 5.4 solar masses and a radius 37.5 times that of the Sun. Polaris Aa has the spectral classification F7Ib. Polaris Aa and Ab are in close orbit with each other and Polaris B is orbiting the pair. Polaris is a triple star system consisting of the yellow supergiant Polaris Aa and two white (spectral type F) main sequence stars, Polaris Ab and Polaris B.
As a yellow supergiant, the star is immense and only appears faint because it is so distant from Earth. This, however, does not mean that it is not particularly luminous. It is the brightest star in the constellation Ursa Minor, but only the 48th brightest star in the sky. Polaris is easily visible to the unaided eye, but not exceptionally bright. It is classified as a classical Population I (metal-rich) Cepheid variable and is the nearest star of this kind to Earth. It lies at an estimated distance between 323 and 433 light years (99 to 133 parsecs) from Earth and has an apparent magnitude that varies between 1.86 and 2.13. Learn More.Polaris, Alpha Ursae Minoris (α UMi), commonly known as the North Star, is the closest relatively bright star to the north celestial pole. Everyone is here to help you find what you need between 9:00 am and 6:00 pm M-F and 9:00 am to 1:00 PM on Saturdays.
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Our technical staff is Polaris® Silver Certified, and our parts teams know how to find even the hardest parts at the best prices available. We strive to have a complete selection of repair parts and accessories on hand in either of our warehouses to help you get going when you are ready to ride. Throughout the past 30 years, we have remained engaged with Polaris®, the outdoor power-sports industry, and the enthusiasts who rely upon Polaris® products for work, relaxation and for excitement. In 2014, we opened our second location in Casa Grande AZ.
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In 2010, we opted to separate the Polaris® product line from the balance of the business and began to build a full line Polaris® dealership. For more than 20 years, the Polaris® products were sold alongside our farm and construction machinery offerings mainly from our location in Phoenix, AZ. Our family first became involved with Polaris® in 1986. We have two valley locations to better serve your parts, accessory and service needs open weekdays and Saturdays too! We stock the complete line of ATV’s UTV’s and side by sides like Polaris Sportsman’s, ACE, Rangers, RZR’s and Gem Car. Iron City Polaris® is a family owned and operated Polaris, GEM dealer. Financing is available OAC.Stop by or call Ryan at 52 for details.
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Notes This 181hp RZR is equipped with the following Aluminum Roof, Full Glass Windshield, RIGID 32 SR Series Lightbar, RIGID 10 SR Series Lightbar, Door Closeoffs, PRO ARMOR Door Bags, Folding Side Mirrors, Premium Rear View Mirror, 30qt Northstar Cooler w/Cooler Bracket, 40L Rear Cargo Box, Low Profile Rock Sliders, Dual RZR Whips, Ride Command w/Rockford Fosgate Stage 2 Audio System, Rockford Fosgate 10 Subwoofer, Fox Dynamix Shocks, Electronic Power Steering, XTC Self-Cancelling Turn Signals, XTC Lighted License Plate Bracket, XKGLOW LED Rock Lights, PRO ARMOR Sport Front Bumper w/Bash Plate, 15 Red System 3 SB-3 Wheels with Black Beadlock Rings, and 32 EFX MotoVator DOT Tires.This customized creation is currently available at Iron City in Casa Grande for $37999.