What is the temperature and class of the star Altair?

Uhm yeah, i've been looking like crazy and just can't seem to find those. It's a project due tomorrow and i that's all i pretty much need. I mean class like, G2, or whatever. And i also need to know what type of star it is. PLEASE AND THANK YOU.What is the temperature and class of the star Altair?Altair or Alpha Aquilae. First magnitude (0.77) Altair, the 13th brightest star in the sky and the Alpha star of Aquila the Eagle, is also the southern anchor of the famed Summer Triangle, which it makes with Vega and Deneb. The Arabic name "Altair," reflective of the constellation itself, comes from a phrase meaning "the flying eagle." Though the constellation does not look much like its name, Altair itself is flanked by a pair of stars (the Beta and Gamma stars Alshain and Tarazed) that really do remind the sky- gazer of a bird with outstretched wings. The trio of stars has in fact been taken for an airplane with wing lights slowly flying across the sky. Though three of the stars of the Summer Triangle are all white in color and hotter than the Sun, all are also individuals. A class A hydrogen-fusing dwarf with a temperature of 7550 degrees Kelvin, Altair is the coolest of the three (with Vega and Deneb warmer at 9500 and 8400 respectively). Altair is also the least luminous. From its distance of 16.8 light years, we find it to be 10.6 times brighter than the Sun, as opposed to 50 times for Vega and an astounding 160,000 or so for much more distant Deneb. Like the Sun and Vega, Altair is "on the main sequence" of stars, fusing hydrogen into helium in its core, its mass falling between 1.7 and 1.8 solar. Though seemingly ordinary, the star is not without its own striking characteristics. It is moving across the sky against the background of distant stars more quickly than most, and will displace itself by as much as a degree in only 5000 years. Altair is also a very rapid rotator. Its equatorial spin speed, while certainly not a record, is still an astonishing 210 kilometers per second (and may be greater, since the axial tilt is not known), as compared with the Sun's 2 kilometers per second. With a radius 1.8 times that of the Sun (confirmed by direct angular diameter measures, which give 1.7), the star has a rotation period of at most only 10 hours, as opposed to nearly a month for our ponderously spinning Sun. Altair's high speed has even caused it to become distorted. Observation with a sophisticated interferometer, from which the angular size of the star is measured, reveals a 14% oblateness. Even with its high rotational velocity, however, Altair is far from its rotational breakup speed of 450 kilometers per second. Altair has also recently been identified as a subtle "Delta Scuti) variable, the brightest in the sky, the star flickering by a few thousandths of a magnitude with nine different periods that range from 50 minutes to 9 hours.



http://www.solstation.com/stars/altair.h鈥?/a>

http://www.astro.uiuc.edu/~jkaler/sow/al鈥?/a>

http://en.wikipedia.org/wiki/AltairWhat is the temperature and class of the star Altair?Altair, also known as Alpha Aquilae, is a Main Sequence or hydrogen fusing star of spectral type A7V. Stars of this spectral type have a surface temperature of about 8000 to 9000 degrees Centigrade, a diameter about twice that of the Sun and a luminosity about 11 or 12 Suns. The mass is a little less than twice that of the Sun. However, because this star spins very rapidly, the surface temperature varies dramatically from the equator to the poles. This star spins once every 9 hours, making it very pumpkin shaped with a equatorial diamerter some 20 percent greater than the diameter through the star's poles. The result is the poles are actually the hottest at 8,500 degrees Centigrade, with the equator being at a temperature of only about 7,000 degrees Centigrade. Although it is a Main Sequence star, recent observations also show it is a variable star, but the variability is extremely slight and thus it is considered to be a Delta Scuti star. These are stars about to exhaust their stores of hydrogen in the core and start expanding into red giants. You can find a great deal of information about this star like all the other well known stars online. It is however one of our closest neighbors at 16 light years and is a very interesting object for astronomers.What is the temperature and class of the star Altair?http://en.wikipedia.org/wiki/Altair