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Exoplanetary Scratchpad

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Stars with lower metalicity than their main sequence counterparts. Often more bluish in color also. Thought to have been born in an earlier era with fewer Supernova created heavy elements were present, or in a different region of the galaxy. Many halo stars are subdwarves.

Subdwarf Stars Web Pages[]

Subdwarf Stars In the News[]

Article on Nearby Halo Stars (1998)[]

Nearby Subdwarfs[]

  • Gliese 191 System - Kapteyn's Star is also known as VZ Pic, Gl 191, HD 33793, and Cordoba Zone 5 hours 243. Kapteyn noticed that a star was missing from a catalog until its new position was found. Has the second highest proper motion of any stars. Also informally called Proxima Pictoris. Nearby large and old Red Dwarf star system and nearest Halo object thought to be a remnant of the nearest and largest global cluster, Omega Centauri, which is 16,000 ly away and shredded by the Milky way 11.5 BYA, and born while that was still a separate galaxy. 2.5 times as old as the Sun and born when the Universe was only 2 BYO. Was within 3 light years of Epsilon Eridani 31,500 years ago. Will be on the other side of the galaxy in 100 MY. Is a sub-dwarf or main sequence star. Has two planets. The first is at least a 4.5 ME Super Earth (0.16 AU) and is the oldest Potentially Habitable Planet. The second is over 7 ME and beyond the HZ (0.3 AU).
  • Gliese 299 System - Ross 619 is also known as Gl 299. Nearby sub-dwarf red dwarf star in Cancer.
  • Gliese 53 System - Gliese 53 System
  • Gliese 451 System - Groombridge 1830 is also known as HR 4550, HD 103095, and Gl 451. Nearby dim yellow subdwarf star. It was first mentioned in Groombridge's catalog of circumpolar stars. It was found to have the highest proper motion of any star by Argelander in 1842 (replacing 61 Cygni), and is now known to have the third highest. It is likely a halo star, and has not evolved onto the main sequence despite its old age 5 or 10 billion years old. Being a halo star that does not follow the rotation of the galaxy explains its high proper motion. It is part of the Groombridge 1830 Moving Group, which consists of several other subdwarf stars. Van de Kamp recorded a flare which he assumed was a dim companion star. It has since been found to undergo superflares.
  • Gliese 699.1 System- Gliese 699.1 System
  • Gliese 1062 System - Gliese 1062 System
  • Gliese 781 System - Gliese 781 System
  • Gliese 158 System - Gliese 158 System
  • LHS 3409 System - Gliese 3409 System
  • WO 9371 System - WO 9371 System
  • WO 9722 System - WO 9722 System
  • LHS 375 System - LHS 375 System
  • Gliese 1064 System - Gliese 1064 System
  • LHS 2815 System - LHS 2815 System

See Also[]