Gliese 412

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Template:Short description Template:Sky

Gliese 412 A/B
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Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major[1][2]
Gliese 412 A
Right ascension Template:RA[3]
Declination Template:DEC[3]
Apparent magnitude (V) 8.68[4]
Gliese 412 B
Right ascension Template:RA[5]
Declination Template:DEC[5]
Apparent magnitude (V) 14.45[6]
Characteristics
Gliese 412 A
Spectral type M1.0V[4]
U−B Template:Engvar +1.16[7]
B−V Template:Engvar +1.54[7]
Gliese 412 B
Spectral type M6.0V[6]
B−V Template:Engvar +2.08[8]
Astrometry
Gliese 412 A
Radial velocity (Rv)Script error: No such module "val".[3] km/s
Proper motion (μ) RA: Script error: No such module "val". mas/yr[3]
Dec.: Script error: No such module "val". mas/yr[3]
Parallax (π)203.8876±0.0332 mas[3]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)10.34[9]
Gliese 412 B
Radial velocity (Rv)Script error: No such module "val".[5] km/s
Proper motion (μ) RA: Script error: No such module "val". mas/yr[5]
Dec.: Script error: No such module "val". mas/yr[5]
Parallax (π)203.8323±0.0500 mas[5]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)16.05[9]
Details
Gliese 412 A
MassScript error: No such module "val".[10] Template:Solar mass
RadiusScript error: No such module "val".[10] Template:Solar radius
LuminosityScript error: No such module "val".[10] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[10] cgs
TemperatureScript error: No such module "val".[10] K
Metallicity [Fe/H]Script error: No such module "val".[10] dex
RotationScript error: No such module "val".[11]
Rotational velocity (v sin i)<3[12] km/s
Age3[13] Gyr
Gliese 412 B
MassScript error: No such module "val".[13] Template:Solar mass
RadiusScript error: No such module "val".[13] Template:Solar radius
LuminosityScript error: No such module "val".[14] Template:Solar luminosity
TemperatureScript error: No such module "val".[13] K
Metallicity [Fe/H]Script error: No such module "val".[13] dex
Rotational velocity (v sin i)Script error: No such module "val".[12] km/s
Other designations
Template:Odlist[15][4]

A: Template:Odlist[4]

B: Template:Odlist[6]
Database references
B

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Gliese 412 is a binary star system in the constellation Ursa Major. Among the nearest stars, they lie at a distance of Script error: No such module "convert".. The pair have an angular separation of 31.4″ at a position angle of 126.1°.[16] Both components are relatively dim red dwarf stars.

History of observations

This system, also known as Lalande 21258, was announced in 1860 as a high apparent proper motion star by Friedrich Wilhelm Argelander as a result of work on the Bonner Durchmusterung (BD).[17] Adalbert Krueger, an assistant to the BD project, was tasked with measuring its parallax. In Krueger's paper reporting the result, he dubbed it Argelander's Third Star.[18]

The primary star was monitored for radial velocity (RV) variations caused by a Jupiter-mass companion in a short-period orbit. It displayed no significant excess of RV variation that could be attributed to a planet.[19] A search of the system using near-infrared speckle interferometry also failed to detect a companion orbiting at distances of 1–10 AU.[20] Nor has a brown dwarf been detected orbiting within this system.[21]

Characteristics

The two stellar components of this system have a projected separation of about 152 AU, and an estimated orbital semimajor axis of 190 AU.[22]

The primary has 0.387 times the mass of the Sun, 0.398 times the Sun's radius and 2.23% of the Sun's luminosity.[10] It is spinning at a rotation velocity at the equator of less than 3 km/s.[12] The secondary is smaller and fainter, at 9.52% of the Sun's mass, 12.62% of the Sun's radius[13] and luminosity only 0.09% solar.[14] It is spinning at a rotation velocity of Script error: No such module "val". km/s.[12] Gliese 412 A has a temperature of 3,639Script error: No such module "String".K,[10] while Gliese 412 B has 2,863 K.[13]

The space velocity components of this system are U = 141, V = –7 and W = 7. They are members of the halo population of the Milky Way galaxy.[12]

X-ray source

The secondary is a flare star that is referred to as WX Ursae Majoris. It is characterized as a UV Ceti-type variable star that displays infrequent increases in luminosity. This star was observed to flare as early as 1939 by the Dutch astronomer Adriaan van Maanen.[23]

Component B (WX Ursae Majoris) has been identified as an X-ray source, while no significant X-ray emission was detected from component A.[24] This system had not been studied in X-rays prior to ROSAT.[24]

References

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  1. ↑ Template:Cite constellation
  2. ↑ Template:Cite constellation
  3. ↑ a b c d e Template:Cite Gaia DR3
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  5. ↑ a b c d e Template:Cite Gaia DR3
  6. ↑ a b c Template:Cite simbad
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  9. ↑ a b Script error: No such module "citation/CS1".
  10. ↑ a b c d e f g h Script error: No such module "Citation/CS1".
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  12. ↑ a b c d e Script error: No such module "Citation/CS1".
  13. ↑ a b c d e f g Script error: No such module "Citation/CS1".
  14. ↑ a b Script error: No such module "Citation/CS1".
  15. ↑ Template:Cite simbad
  16. ↑ Script error: No such module "Citation/CS1".
  17. ↑ Script error: No such module "Citation/CS1".
  18. ↑ Script error: No such module "Citation/CS1".
  19. ↑ Script error: No such module "Citation/CS1".
  20. ↑ Script error: No such module "Citation/CS1".
  21. ↑ Script error: No such module "Citation/CS1".
  22. ↑ Script error: No such module "Citation/CS1".
  23. ↑ Script error: No such module "Citation/CS1".
  24. ↑ a b Script error: No such module "Citation/CS1".

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See also

Template:Nearest systems Template:Stars of Ursa Major

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