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Exoplanetary Scratchpad

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Spectral Standard Stars Web PagesEdit

Red DwarvesEdit

  • Gliese 270 System (M0 V) - Gl 270 is the M0 V spectral standard star and is also known as BD+33 1505, Hip 35495, BD+33 1505,G 87-33, LHS 1912, and V 16.
  • Gliese 229 System (M1 V) - BD-21°1377 is also called L 668-21 and Gl 229 and informally as Proxima Leporus. It is a red dwarf flare star (has one of the highest diameters) with a T6V brown dwarf orbiting it. It has 25 to 65 times Jupiter's and currently about 40 AU from the star. This was the first sub-stellar mass object discovered, in 1994. The star is the current Spectral Standard star for class M1 V.
  • Lalande 21185 System (M2 V) - Lalande 21185 is also called GJ 411 and informally Proxima Ursa Majoris. It is the fourth closest star system to the Sun at 8.3 ly. It is the third brightest red dwarf in the night sky. It has been the spectral standard star for class M2 V for a long time. It is sometimes classified as a BY Draconis type variable star and has been known to emit x-rays. Van de Kamp thought he found planets in 1951. The system has two unconfirmed planets detected via radial velocity in 1996. It is also one of the earliest planets detected that still has a good chance to exist. The planets orbit far away from their dim Red Dwarf star, which makes one planet colder than Saturn and the other colder than Neptune despite being at a Saturn-like distance. The star is the nearest Galactic 'Thick Disk' star (which includes about 4% of nearby stars), and moves perpendicular to the galactic plane. It will get nearest to the Sun in 19,000 years when it is 4.65 ly.
  • Gliese 752 System (M3 V) - BD+04°4048 is most commonly known as Gliese 752 and also called DM+04°4048. A nearby binary Red Dwarf star system in Aquila and the nearest star to Altair, which appears two order of magnitude than in our sky. Star A is also a flare star known as V1428 Aquilae and is also known as HD 180617. Its high proper motion was first noticed by Max Wolf in 1919, and dubbed Wolf 1055. It was later rediscovered by Frank Ross in 1927 and dubbed Ross 652. It has about half of the Sun's mass and radius and is the M3 V spectral standard star. Star B is also a UV Ceti variable star known as V1298 Aquilae and VB 10 or simply Van Biesbroeck's Star. It shares a proper motion with star A, but is not gravitationally bound with it and lies 434 AU away. VB 10 was the faintest star known when it was discovered in 1944 and is the M8 V spectral standard star. VB 10 contains a controversial "first" exoplanetary system announced in 2009 using astrometry and lies only 20 light years away, but not confirmed with dopplar spectrometry. Would be smallest known star to host a planet and is a flare star. Contain's a cold Jupiter six times Jupiter's mass a Mercury like distance. The "planet" and the star are about the same size and the planet contains 10% of the mass of the system. The star will burn for 10 trillion years, then the planet would fall into it, fuelling it for another 100 billion years. The system is about 1 Billion years old. Mnemonic is BD Aquilae.
  • Gliese 402 System (M4 V) - Wolf 358 is also known as Gl 402. It is a nearby red dwarf star, possibly with a companion. It is also a flare star called EE Leonis. It is the M4 V spectral standard star.
  • Gliese 51 System (M5 V) - Gl 51 is the M5 V spectral standard star and is also known as V338 Cassiopeiae, Wolf 47, and LHS 1183. It is in Casseopia.
  • Wolf 359 System (M6 V) - Wolf 359 is also called Gl 406, and CN Leonis and informally called Proxima Leonis. Third nearest star system to the Sun. It is one of the smallest Red Dwarf stars known and is a flare star and the M6 V spectral standard star. Its proper motion was first measured by German astronomer Max Wolf in 1917. It was the lowest mass and faintest star known until the discovery of VB 10 in 1944. Its temperature is so low that chemical compounds can exist in it, which is rare for a star. It is a relatively young star, less than a billion years old.
  • Van Biesbroeck 8 System (M7 V) - BD-08°4352 is also known as Wolf 630, Gl 644, and HD 152751. It is a nearby triple or quadruple (once thought to be quintuple, and the nearest one) red dwarf system in Ophiuchus, consisting of Gl 644 A, Bb, Bc, C. It is also known as Gl 644. All stars are red dwarfs, but combined exceed the Sun's mass. Stars A and B (Ba/Bb) are separated by about 1.3 AU, which for 50 years was the closest any stars have been visually resolved since its duplicity was found in 1934. These three stars are probably coplanar. Star A is the flare star known as V1054 Ophiuchi. Star B is a close unresolved spectroscopic binary, with Ba and Bb being separated only by 0.04 AU (but it might just be a single star). Star C orbits at 1420 AU away, though stability analysis suggests it must be at least 2840 AU. It is flare star and also known as VB 8 and is the smallest and faintest member. VB 8 is the M7 V spectral standard star. In 1984, there were claims that the first exoplanet orbited this star, and later claims of a Brown Dwarf, but these have been refuted. It was once thought that Wolf 629 was gravitationally bound to this system, which was also dubbed planet D. Parallax measurements showed that it has to be at least 1 ly from the system though. The star is the first star in the proposed Wolf 630 moving group.
  • VB 10 System (M8 V) - BD+04°4048 is most commonly known as Gliese 752 and also called DM+04°4048. A nearby binary Red Dwarf star system in Aquila and the nearest star to Altair, which appears two order of magnitude than in our sky. Star A is also a flare star known as V1428 Aquilae and is also known as HD 180617. Its high proper motion was first noticed by Max Wolf in 1919, and dubbed Wolf 1055. It was later rediscovered by Frank Ross in 1927 and dubbed Ross 652. It has about half of the Sun's mass and radius and is the M3 V spectral standard star. Star B is also a UV Ceti variable star known as V1298 Aquilae and VB 10 or simply Van Biesbroeck's Star. It shares a proper motion with star A, but is not gravitationally bound with it and lies 434 AU away. VB 10 was the faintest star known when it was discovered in 1944 and is the M8 V spectral standard star. VB 10 contains a controversial "first" exoplanetary system announced in 2009 using astrometry and lies only 20 light years away, but not confirmed with dopplar spectrometry. Would be smallest known star to host a planet and is a flare star. Contain's a cold Jupiter six times Jupiter's mass a Mercury like distance. The "planet" and the star are about the same size and the planet contains 10% of the mass of the system. The star will burn for 10 trillion years, then the planet would fall into it, fuelling it for another 100 billion years. The system is about 1 Billion years old. Mnemonic is BD Aquilae.
  • LHS 2924 System (M9 V) - LHS 2924 is the M9 V spectral standard star and is also known as LP 271-25.

Spectral Standard Stars In the NewsEdit

Sample (Year)Edit

See AlsoEdit

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