main-sequence star


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main-sequence star:

see Hertzsprung-Russell diagramHertzsprung-Russell diagram
[for Ejnar Hertzsprung and H. N. Russell], graph showing the luminosity of a star as a function of its surface temperature. The luminosity, or absolute magnitude, increases upwards on the vertical axis; the temperature (or some temperature-dependent
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main-sequence star

A star lying on the main sequence.
References in periodicals archive ?
The third type of potential donor in an AM CVn system is the evolved main-sequence star.
Either the star is so young that it hasn't finished contracting or so old--about 500 million years--that it has had time to expand its girth after becoming a main-sequence star.
The new observation also marks the first time astronomers have imaged a disk around a mature, main-sequence star using the radio energy given off by dust particles.
Double stars, Cepheid variable stars, Viewing galaxies, Black holes, Main-sequence stars, Globular clusters, Discovery of Proxima, Extra-solar planets, Open star clusters, Sub-giant stars, Nebulae, Yellow-dwarf star, Barred spiral galaxies, Galaxies and time, Close double stars, Coloured double stars, Super galaxy clusters, Mira variable stars, Giant stars, Carbon stars, Observing double stars, Solar type stars, Nicolas Louis de Lacaille, Astrophotography, Light year, Sub-dwarf stars, Venial equinox, Hot Jupiters, Delta-Scuti variable star, Apparent brightness.
Optical pictures of the cluster, taken by ground-based telescopes, detect mainly red giant stars and yellow main-sequence stars, whereas the ultraviolet image primarily spotlights hotter, less common stars that evolved from red giants by ejecting their outer atmosphere.
However, tidal Venuses could occur close to dimmer and much less massive bodies - main-sequence stars less than a third the mass of our sun, for instance, or failed stars called brown dwarfs, or dead stars such as white dwarfs.
Sarma, Rao & Abhyanker (15) discuss 30 such systems, noting that most secondaries are overluminous and over-large for their masses, compared to main-sequence stars of their spectral type.