Search results
Results from the WOW.Com Content Network
The spectral classes O through M, as well as other more specialized classes discussed later, are subdivided by Arabic numerals (0–9), where 0 denotes the hottest stars of a given class. For example, A0 denotes the hottest stars in class A and A9 denotes the coolest ones.
Regulus A is a binary star consisting of a blue-white subgiant star of spectral type B8, which is orbited by a star of at least 0.3 solar masses, which is probably a white dwarf. The two stars take approximately 40 days to complete an orbit around their common centre of mass.
In Chinese, 星宿 (Xīng Xiù), meaning Star, refers to an asterism consisting of Alphard, τ 1 Hydrae, τ 2 Hydrae, ι Hydrae, 26 Hydrae, 27 Hydrae, HD 82477 and HD 82428. [16] Consequently, Alphard itself is known as 星宿一 (Xīng Xiù yī), "the First Star of Star". [17] In ancient China it formed part of an asterism called the "red bird".
Meghnad Saha c. 1934. Meghnad Saha was born on 6 October 1893 to a low-caste Bengali Hindu family in the village of Sheoratali in Gazipur, then part of the Dacca district of the Bengal Presidency (now Bangladesh.
The Star-Spectroscope of the Lick Observatory in 1898. Designed by James Keeler and constructed by John Brashear.. Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, ultraviolet, X-ray, infrared and radio waves that radiate from stars and other celestial objects.
Of apparent magnitude 4.06, Upsilon Boötis has a spectral class of K5 and an absolute magnitude of −0.3. Dimmer than Upsilon Boötis is magnitude 4.54 Phi Boötis, with a spectral class of K2 and an absolute magnitude of −0.1. Just slightly dimmer than Phi at magnitude 4.60 is O Boötis, which, like Izar, has a spectral class of K0. O ...
This was based on the relative strengths of certain spectral lines understood to be sensitive to the luminosity of a star. [47] In the Bright Star Catalogue 5th edition it is given the spectral class F0II, the luminosity class indicating a bright giant. [48] Balmer line profiles and oxygen line strengths indicate the size and luminosity of ...
The spectral flux density is used to represent the spectrum of a light-source, such as a star. In radiometry and colorimetry (or color science more generally), the spectral power distribution (SPD) of a light source is a measure of the power contributed by each frequency or