F-type star
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An F-type star is a classification of star.
In F-type stars in open clusters a curious gap appears around F 7. Before and after the gap (or dip), Li is abundant, whereas in the gap it almost disappears (Boesgaard and Tripicco 1986, Balachandran 1990). A detailed investigation by Lambert et al.
For F-type stars, the spectral lines of neutral atoms are weak relative to those of ionized atoms. Moreover, hydrogen lines are not as strong as those in A-type stars.
For example, a F-type star formed as a F-type star and will remain a F-type star during the entire main sequence stage. Only if the star has a very close companion may a change occur if gas is transferred between the stars in the system.
The images taken over a month show the black silhouette of the disc beginning to edge across the surface of the primary star, which is an F-type star with a mass 3.6 times that of the Sun. The size of the disc has been measured at about 2.
Canopus is essentially white when seen with the naked eye (though F-type stars are sometimes listed as "yellowish-white"). It is located in the far southern sky, at a declination of âˆ'52° 42' (2000) and a right ascension of 06h24.0m.[1] ...
[7545] xi Scorpii has at least five components, split into two groups lying 4.67 arcminutes away from each other. The brighter group contains two yellow-white F-type stars - a subgiant and a dwarf - and a fainter companion.
For a star like the Sun (a G-type star), the zone extends from about 0.85 A.U. to 2.0 A.U. For an F-type star, the range is 1.2 to 2.8 A.U. For a faint M-type star only planets orbiting between about 0.02 and 0.06 A.U. would be habitable.
Lines of ionized calcium (Ca II) are the most conspicuous. Many lines of ionized and neutral metals are present. Hydrogen lines are weaker even than in F-type stars.
Sun, Capella
K ...
F-type stars are fairly hot and yellowish-white. Procyon (in CANIS MINOR) is a good, bright, F5-type star. An example of a dim F-type is Almaaz (in AURIGA) which is F0. Polaris is an F-type star too but it is F8, ...
 See also: Star, Solar, Absorption, Giant, Isotope
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