Oplysninger om | engelsk ord MAIN-SEQUENCE

Eksempler på brug af MAIN-SEQUENCE i en sætning

• Stars on this band are known as main-sequence stars or dwarf stars, and positions of stars on and off the band are believed to indicate their physical properties, as well as their progress through several types of star life-cycles.
• Over the course of millions of years, these protostars settle down into a state of equilibrium, becoming what is known as a main-sequence star.
• Sirius is a binary star consisting of a main-sequence star of spectral type A0 or A1, termed Sirius A, and a faint white dwarf companion of spectral type DA2, termed Sirius B.
• Brown dwarfs are substellar objects that have more mass than the biggest gas giant planets, but less than the least massive main-sequence stars.
• Fomalhaut, K-type main-sequence star TW Piscis Austrini, and M-type, red dwarf star LP 876-10 constitute a triple system, even though the companions are separated by approximately 8 degrees.
• It is a main-sequence star of spectral class K2, with an effective temperature of about , giving it an orange hue.
• Their surface temperatures are similar to those of main-sequence stars of the same mass, but they are significantly more luminous because their radii are larger.
• It consists of a K-type main-sequence star, ε Indi A, and two brown dwarfs, ε Indi Ba and ε Indi Bb, in a wide orbit around it.
• The spectroscopic binary Regulus A consists of a blue-white main-sequence star and its companion, which has not yet been directly observed, but is probably a white dwarf.
• It ends when the infalling gas is depleted, leaving a pre-main-sequence star, which contracts to later become a main-sequence star at the onset of hydrogen fusion producing helium.
• The hottest stars, blue horizontal branch (BHB) stars, are called extreme horizontal branch (EHB) stars and can be hotter than main-sequence stars of the same luminosity.
• 40 Eridani A is a main-sequence dwarf of spectral type K1, 40 Eridani B is a 9th magnitude white dwarf of spectral type DA4, and 40 Eridani C is an 11th magnitude red dwarf flare star of spectral type M4.
• Besides the Sun, other well-known examples of G-type main-sequence stars include Alpha Centauri, Tau Ceti, and 51 Pegasi.
• It was the first main-sequence star found to have an exoplanet (designated 51 Pegasi b, officially named Dimidium) orbiting it.
• Nitrogen-13 plays a significant role in the CNO cycle, which is the dominant source of energy in main-sequence stars more massive than 1.
• This is a G-type main-sequence star with a stellar classification of , where the suffix notation indicates underabundances of iron and carbyne in the spectrum.
• Mamajek & Hillenbrand (2008) have estimated the ages for the 108 solar-type (F8V–K2V) main-sequence stars within 52 light-years (16 parsecs) of the Sun based on their chromospheric activity (as measured via Ca, H, and K emission lines).
• However, Nu Telescopii was shown not to have a peculiar spectrum and was given a class of A9 Vn, indicating that it is an A-type main-sequence star displaying broad (nebulous) absorption lines due to rapid rotation.
• The Aab pair have an angular separation of 6 mas and a combined stellar classification of , matching an F-type main-sequence star with a mild underabundance of iron.
• However, in 1995 Abt and Morrell catalogued it as class ; a somewhat hotter and more massive A-type main-sequence star that displays spectral peculiarities as well as nebulous lines brought about by rapid rotation.

Sideforberedelse tog: 302,74 ms.