What is the Morgan Keenan spectral classification system?
In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Most stars are currently classified under the Morgan–Keenan (MK) system using the letters O, B, A, F, G, K, and M, a sequence from the hottest (O type) to the coolest (M type).
What does OH a fine girl kiss me mean?
Every student in introductory astronomy learns the mnemonic “Oh Be a Fine Girl/Guy, Kiss Me”, which is a way to remember the spectral classification of stars. Oh: O class stars are the hottest, with peak temperatures in the ultraviolet part of the spectrum.
What is meant by spectral class?
Spectral class indicates the relative abundance of the different elements in stars and correlates with temperature, so O and B stars are hotter than K and M stars. Massive stars, also called spectral class O stars because of their characteristics are the brightest and the most short-lived stars in the universe.
What are the 3 types of spectra?
There are three general types of spectra: continuous, emission, and absorption. Each is characterized by a different distribution of the wavelengths (i.e., colors) of radiation.
What is the Morgan-Keenan spectral classification system quizlet?
What is the Morgan-Keenan Spectral Classification system? A method of classifying stars by their temperatures and compositions. There are fewer than one billion stars in the galaxy. Which of the following happens during the main-sequence stage of a star’s life?
What is the sun’s luminosity class?
G2V
The Sun is an example of a main sequence star, of spectroscopic type G2. Therefore, the combined color and luminosity class for the Sun is G2V (the same as alpha Centauri).
What class is our sun?
G-type main-sequence star
According to its spectral class, the Sun is a G-type main-sequence star (G2V). As such, it is informally, and not completely accurately, referred to as a yellow dwarf (its light is closer to white than yellow).
How are stars classified by spectral type?
Stars are classified by their spectra (the elements that they absorb) and their temperature. In order of decreasing temperature, O, B, A, F, G, K, and M. O and B stars are uncommon but very bright; M stars are common but dim.. An easy mnemonic for remembering these is: “Oh be a fine guy/girl, kiss me.”
What is spectral class on the HR diagram?
Stars of similar size, temperature, composition and other properties have similar spectra and are classified into the same spectral class. The main spectral classes for stars range from O (the hottest) through B, A, F, G, K and M (coolest). Our Sun is a G-class star.
Apakah bintang kelas O adalah bintang paling panas?
Akan sangat membantu jika dapat memahami diagram Hertzsprung-Russel atau diagram HR terlebih dahulu. Bintang kelas O adalah bintang yang paling panas, temperatur permukaannya lebih dari 25.000 Kelvin.
Apakah bintang kelas A merupakan bintang deret utama?
Bintang kelas A kira-kira hanya 0.63% dari seluruh populasi bintang deret utama. Bintang kelas F memiliki temperatur permukaan 6000 hingga 7500 Kelvin, berwarna putih-kuning.
Apakah bintang kelas F adalah bintang deret utama?
Bintang kelas F kira-kira 3,1% dari seluruh populasi bintang deret utama. Bintang kelas G mungkin adalah yang paling banyak dipelajari karena Matahari adalah bintang kelas ini. Bintang kelas G memiliki temperatur permukaan antara 5000 hingga 6000 Kelvin dan berwarna kuning.
Siapa astronom yang mengelompokan spektrum bintang?
Pola spektrum bintang umumnya berbeda-beda, pada tahun 1863 seorang astronom bernama Angelo Secchi mengelompokan spektrum bintang dalam 4 golongan berdasarkan kemiripan susunan garis spektrumnya.