K-type main-sequence star - Wikipedia
A K-type main-sequence star, also referred to as a K-type dwarf, or orange dwarf, is a main-sequence (hydrogen-burning) star of spectral type K and luminosity class V. These stars are intermediate in size between red M-type main-sequence stars ("red dwarfs") and yellow/white G-type main-sequence stars .
Habitability of K-type main-sequence star systems - Wikipedia
These stars are known as "Goldilocks stars" as they emit enough radiation in the non-UV ray spectrum [1] to provide a temperature that allows liquid water to exist on the surface of a planet; they also remain stable in the main sequence longer than the Sun by burning their hydrogen slower, [2] allowing more time for life to form on a planet ...
矮星 - 百度百科
棕矮星（Brown dwarf）是类恒星天体的一种，质量约为5至90个木星之间。 与一般恒星不同，棕矮星由质量不足，其核心并不会融合氢原子来发光发热，无法成为主序星。
Comparison of G, K, and M Stars for Habitability | HubbleSite
2020年1月8日 · This infographic compares the characteristics of three classes of stars in our galaxy: Sunlike stars are classified as G stars; stars less massive and cooler than our Sun are K dwarfs; and even fainter and cooler stars are the reddish M dwarfs. The graphic compares the stars in terms of several important variables. The habitable zones ...
K-type star - Vaporia
A K-type star is a star within the K-class, a spectral class indicating stars with neutral metal and very weak hydrogen absorption lines, with an orange color, and a surface temperature in the 3700-5200 K range. The spectral energy distribution (SED) peaks in …
Dwarf star - Wikipedia
A dwarf star is a star of relatively small size and low luminosity. Most main sequence stars are dwarf stars. The meaning of the word "dwarf" was later extended to some star-sized objects that are not stars, and compact stellar remnants that are no longer stars.
ABOUT EXOBIOLOGY: THE CASE FOR DWARF K STARS
2016年8月10日 · Early K stars are found to have the highest HabPREP values, indicating that they may be "Goldilocks" stars for life-hosting planets. Red dwarfs are numerous, with long lifetimes, but their narrow CLI-HZs and hazards from magnetic activity make them less suitable for …
Looking for Life? Try Around K Dwarfs - AAS Nova
2019年3月20日 · Dimmer than G dwarfs, K dwarfs provide better planet-to-star contrast ratios that make it easier to observe potential habitable worlds. And they are are less active than M dwarfs, providing a more hospitable environment for their planets.
K-type Star - (Intro to Astronomy) - Fiveable
A K-type star, also known as an orange dwarf, is a class of main-sequence stars that are cooler, less massive, and less luminous than the Sun. These stars have surface temperatures ranging from around 3,700 to 5,200 Kelvin and are characterized by their distinctive orange-red hue.
k-type dwarf stars: Topics by Science.gov
2018年1月1日 · Early K stars are found to have the highest HabPREP values, indicating that they may be “Goldilocks†stars for life-hosting planets. Red dwarfs are numerous, with long lifetimes, but their narrow CLI-HZs and hazards from magnetic activity make them less suitable for …