9 Andromedae

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9 Andromedae
Template:Location mark
Location of 9 Andromedae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 5.98[2]
Characteristics
Spectral type A7 V[3] or A7m[2]
B−V Template:Engvar Template:Val[2]
Variable type β Lyr[4]
Astrometry
Radial velocity (Rv)Template:Val[2] km/s
Proper motion (μ) RA: −10.266[1] mas/yr
Dec.: −9.791[1] mas/yr
Parallax (π)7.0976±0.0544 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)0.43[2]
Orbit[5]
Period (P)3.2196 d
Eccentricity (e)0.03
Inclination (i)60.2[6]°
Periastron epoch (T)Template:Val
Semi-amplitude (K1)
(primary)		71.6 km/s
Details[6]
9 And A
Mass2.48 Template:Solar mass
Radius3.51 Template:Solar radius
Luminosity49.2 Template:Solar luminosity
Temperature8,200 K
Rotational velocity (v sin i)81[7] km/s
9 And B
Mass1.32 Template:Solar mass
Luminosity17.5 Template:Solar luminosity
Temperature6,330 K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[8]
Database references
SIMBADdata

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File:ANAndLightCurve.png
A light curve for AN Andromedae, plotted from TESS data[9]

9 Andromedae, abbreviated 9 And by convention, is a variable binary star system in the northern constellation Andromeda. 9 Andromedae is the Flamsteed designation, while it bears the variable star designation AN Andromedae, or AN And. The maximum apparent visual magnitude of the system is 5.98,[2] which places it near the lower limit of visibility to the human eye. Based upon an annual parallax shift of Template:Val,[1] it is located 460 light years from the Earth.

This system was determined to be a single-lined spectroscopic binary in 1916 by American astronomer W. S. Adams, and the initial orbital elements were computed by Canadian astronomer R. K. Young in 1920.[6] The pair orbit each other with a period of 3.2196 days and an eccentricity of 0.03.[5] It is an eclipsing binary, which means the orbital plane is inclined close to the line of sight and, from the perspective of the Earth, the stars pass in front of each other, causing two partial eclipses every orbit. During the transit of the secondary in front of the primary, the visual magnitude drops to 6.16, while the eclipse of the secondary by the primary lowers the net magnitude to 6.09.[10]

References

Template:Reflist

External links

Template:Stars of Andromeda

  1. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named GaiaDR2
  2. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  3. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Hill1975
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named gcvs
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Pourbaix2004
  6. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Tremko1978
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Royer2002
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named MAST
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Avvakumova2013
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