Mu Andromedae

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Template:Short description

μ Andromedae
Template:Location mark
Location of μ Andromedae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.87[2]
Characteristics
Spectral type A5 V[3]
U−B Template:Engvar +0.15[2]
B−V Template:Engvar +0.12[2]
Variable type RS CVn[4]
Astrometry
Radial velocity (Rv)+7.6[5] km/s
Proper motion (μ) RA: +151.021 mas/yr[1]
Dec.: +34.800 mas/yr[1]
Parallax (π)26.7046±0.6467 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+0.86[6]
Orbit[4]
Period (P)Template:Val
Semi-major axis (a)Template:Val
Eccentricity (e)0.8405±0.0009
Inclination (i)52.5±0.3°
Longitude of the node (Ω)−17.6±0.2°
Periastron epoch (T)55765.45 ± 0.04 MJD
Argument of periastron (ω)
(secondary)		168.9±0.3°
Semi-amplitude (K1)
(primary)		11.1±0.5 km/s
Details[7]
MassTemplate:Val Template:Solar mass
RadiusTemplate:Val Template:Solar radius
LuminosityTemplate:Val Template:Solar luminosity
Surface gravity (log g)3.99[8] cgs
TemperatureTemplate:Val K
Metallicity [Fe/H]+0.03[9] dex
Rotational velocity (v sin i)75[10] km/s
AgeTemplate:Val Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[11]
Database references
SIMBADdata

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Mu Andromedae is a binary star system in the northern constellation of Andromeda. Its Bayer designation is Latinized from μ Andromedae, and abbreviated Mu And or μ And, respectively. The system has an apparent visual magnitude of 3.87,[2] making it readily visible to the naked eye. Based upon parallax measurements, it is located at a distance of approximately Template:Convert from Earth.[1] In the constellation, the star is situated about halfway between the bright star Mirach to the southwest and the Andromeda Galaxy (M31) to the northeast.[12]

The spectrum of this star matches a stellar classification of A5 V,[3] indicating that it is an A-type main sequence star. It has 2.2 times the mass of the Sun and three times the Sun's radius. The star is radiating about 40 times the luminosity of the Sun from its outer envelope at an effective temperature of 8,320 K,[7] giving it the characteristic white glow of an A-type star.[13] It is estimated to be about 724 million years old,[7] with a relatively high projected rotational velocity of 75 km/s.[10]

In 2007, Mu Andromedae was found to be a tidally-locked close binary system with an unseen companion. The two stars orbit each other every 550.7 days. The tidal interactions have spun up the primary star, causing it to become magnetically active and host unusually strong starspots.[4]

Naming

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Legs (asterism), refers to an asterism consisting of μ Andromedae, η Andromedae, 65 Piscium, ζ Andromedae, ε Andromedae, δ Andromedae, π Andromedae, ν Andromedae, β Andromedae, σ Piscium, τ Piscium, 91 Piscium, υ Piscium, φ Piscium, χ Piscium and ψ¹ Piscium. Consequently, the Chinese name for μ Andromedae itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[14]

References

Template:Reflist

External links

Template:Stars of Andromeda

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named GaiaEDR3
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named clpl4_99
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aj74_375
  4. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named roettenbacher
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named gcsrv
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  7. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Maestro2013
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aass85_3_1015
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa347_876
  10. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aaa463_2_671
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named reddy2011
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named csiro
  14. ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日 Template:Webarchive
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