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physical object > natural object > celestial body > star > early star > F star

F star
subject			fact

F star	has color yellow-white
	has surface temperature 6000 to 7500 K
	has definition Star of spectral type F in which lines of hydrogen and Ca II are of about equal strength. Metal lines also become noticeable.
	is a kind of early star
early star	has spectral type O, B, A, and early F
star	has star surface temperature
	has V magnitude
	has B magnitude
	has U magnitude
	has position on celestial sphere from the point of view of Earth
	has parallax from the point of view of Earth's orbit
	has proper motion
	has radiation at surface which is diffused out from the hotter core
	has energy source gravitational contraction and or fusion
	has energy production which takes place primarily within the core
	has surface density which depends on luminosity class
	has apparent magnitude
	has absolute magnitude
	has age
	has catalog star catalog
	has material hydrogen, helium
	has velocity determined from proper motion and radial velocity
	has mass greater than 0.08 the sun's mass
celestial body	has spectra
physical object	has location or center of gravity
	has angular momentum
	has momentum
	has temperature
	has volume
	has extent

Kinds of F star :

• Alpha Caeli (10 facts) (HR 1502)
• Alpha Chamaeleontis (10 facts) (HR 3318)
• Alpha Comae Berenices (9 facts) (HR 4969)
• Alpha Fornacis (10 facts) (HR 963)
• Alpha Leporis (9 facts) (HR 1865)
• Alpha Persei (10 facts) (HR 1017)
• Beta Delphini (10 facts) (HR 7882)
• Canopus (14 facts) (alpha Car, HR 2326) - A supergiant, the second brightest star in the southern sky.
• Delta Scuti (10 facts) (HR 7020)
• Polaris (20 facts) (HR 424, Pole star, North Star) - A supergiant F8 Ib, F3 V visual binary, with an orbital period of thousands of years. The primary (a Cepheid with a pulsation period of 3.97 days) is itself a single-lined spectroscopic double with a period of 29.6 years. There are at least two more faint (12th mag) components of the system.
• post-asymptotic branch star (3 facts) - F-type supergiant with strong sulfur lines.
• Procyon (16 facts) (alpha CMi, HR 2943) - One of the nearest stars, it is the eighth brightest star. An F star. It is a visual binary; its companion is a DF8 white dwarf.

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