LN Andromedae

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Template:Short description

LN Andromedae
File:LNAndLightCurve.png
A light curve for LN Andromedae, plotted from Hipparcos data[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Andromeda
LN Andromedae A
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 6.37[3]
LN Andromedae B
Right ascension Template:RA[4]
Declination Template:DEC[4]
Apparent magnitude (V) 9.88[5]
Characteristics
A
Spectral type B2V[6]
Apparent magnitude (U) 5.8[7]
Apparent magnitude (B) 6.377[8]
Apparent magnitude (J) 6.368[9]
Apparent magnitude (H) 6.482[9]
Apparent magnitude (K) 6.496[9]
Variable type SPB?[10]
B
Spectral type A1V[11]
Astrometry
LN Andromedae A
Radial velocity (Rv)Script error: No such module "val".[12] km/s
Proper motion (μ) RA: Script error: No such module "val".[2] mas/yr
Dec.: Script error: No such module "val".[2] mas/yr
Parallax (π)2.1847±0.0280 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−1.66[13]
LN Andromedae B
Proper motion (μ) RA: Script error: No such module "val".[4] mas/yr
Dec.: Script error: No such module "val".[4] mas/yr
Parallax (π)2.2005±0.0182 mas[4]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Details
A
Mass6.5[14] Template:Solar mass
Radius3.1[15] Template:Solar radius
Luminosity608[15] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[14] cgs
TemperatureScript error: No such module "val".[14] K
Metallicity [Fe/H]−0.23[16] dex
Rotational velocity (v sin i)Script error: No such module "val".[14] km/s
AgeScript error: No such module "val".[17] Myr
B
Mass2.1[16] Template:Solar mass
Radius2.0[18] Template:Solar radius
Luminosity13[19] Template:Solar luminosity
Surface gravity (log g)4.1[16] cgs
Temperature9,843[16] K
Metallicity [Fe/H]−0.33[16] dex
Other designations
2MASS J23024514+4403314, HR 8768, BD+43°4378, HD 217811, SAO 52626, PPM 63745, HIP 113802, WDS J23028+4404AB
Database references
SIMBADdata

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LN Andromedae (LN And), also known as HD 217811, HR 8768, is a formerly suspected variable star[6] in the constellation Andromeda. Located approximately Script error: No such module "convert". away from Earth,[2] it shines with an apparent visual magnitude 6.41, thus it can be seen by the naked eye under very favourable conditions. Its spectral classification is B2V, meaning that it is a hot main sequence star, emitting light approximately with a blackbody spectrum at an effective temperature of 18,090 K.[14]

Companion

In the Washington Double Star Catalog LN And has a faint optical companion star with an apparent magnitude of 9.88,[5] Script error: No such module "val". from LN And. The separation has increased from Script error: No such module "val". when it was discovered as a double in 1828.[20] The two stars share the same Hipparcos identifier HIP 113802, and have very similar parallaxes and proper motions.[2][4]

Variability

In 1979, the blue magnitude of LN And was reported to vary by about 0.025 every 28 minutes. Such variability was not known for any class of variable, but the position in the Hertzsprung–Russell diagram at the main sequence (low luminosity) end of the same instability strip as the β Cephei stars would make high-overtone radial pulsations the likely cause.[13] LN And was added to the General Catalogue of Variable Stars as LN Andromedae,[6] but follow-up studies failed to find the same rapid variations, or any significant variations in brightness and it is now listed as probably constant.[21][6]

Analysis of Hipparcos photometry shows variability of about 0.0059 magnitudes with a main period of Script error: No such module "val".. The statistical threshold for these variations is at a level which is only met by 0.01% of stars.[3]Script error: No such module "Unsubst".

References

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  1. ↑ Script error: No such module "citation/CS1".
  2. ↑ a b c d e f g Template:Cite Gaia EDR3
  3. ↑ a b Script error: No such module "Citation/CS1".
  4. ↑ a b c d e f Template:Cite Gaia EDR3
  5. ↑ a b Template:Cite simbad
  6. ↑ a b c d Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "Citation/CS1".
  8. ↑ Template:Cite simbad
  9. ↑ a b c Script error: No such module "Citation/CS1".
  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1".
  12. ↑ Script error: No such module "Citation/CS1".
  13. ↑ a b Script error: No such module "Citation/CS1".
  14. ↑ a b c d e Script error: No such module "Citation/CS1".
  15. ↑ a b Script error: No such module "Citation/CS1".
  16. ↑ a b c d e Script error: No such module "Citation/CS1".
  17. ↑ Script error: No such module "Citation/CS1".
  18. ↑ Script error: No such module "Citation/CS1".
  19. ↑ Template:Cite Gaia DR2
  20. ↑ Script error: No such module "Citation/CS1".
  21. ↑ Script error: No such module "Citation/CS1".

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Template:Stars of Andromeda

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