2 Andromedae

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2 Andromedae
Template:Location mark
Location of 2 Andromedae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 5.09[2] (5.26 + 7.43)[3]
Characteristics
2 And A
Spectral type A1V[4]
U−B Template:Engvar +0.10[5]
B−V Template:Engvar +0.08[5]
2 And B
Spectral type F1V/F4V[3]
Variable type δ Sct?[3]
Astrometry
2 And A
Radial velocity (Rv)Template:Val[6] km/s
Proper motion (μ) RA: 56.38[1] mas/yr
Dec.: −4.47[1] mas/yr
Parallax (π)7.74±0.51 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)Template:Val[7]
2 And B
Absolute magnitude (MV)Template:Val[7]
Orbit[3]
Period (P)Template:Val yr
Semi-major axis (a)Template:Val″
Eccentricity (e)Template:Val
Inclination (i)Template:Val°
Longitude of the node (Ω)Template:Val°
Periastron epoch (T)Template:Val
Argument of periastron (ω)
(secondary)		Template:Val°
Details
2 And A
MassTemplate:Val[7] Template:Solar mass
Luminosity130.50[2] Template:Solar luminosity
Surface gravity (log g)Template:Val[7] cgs
TemperatureTemplate:Val[7] K
Rotational velocity (v sin i)212[8] km/s
AgeTemplate:Val[9] Myr
2 And B
MassTemplate:Val[7] Template:Solar mass
Surface gravity (log g)Template:Val[7] cgs
TemperatureTemplate:Val[7] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBAD2 And
2 And A
2 And B

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File:2AndLightCurve.png
A light curve for 2 Andromedae, plotted from TESS data[11]

2 Andromedae, abbreviated 2 And, is a binary star[3] system in the northern constellation of Andromeda. 2 Andromedae is the Flamsteed designation. It is a faint star system but visible to the naked eye with a combined apparent visual magnitude of 5.09.[2] Based upon an annual parallax shift of Template:Val,[1] it is located 420 light years away. The binary nature of the star was discovered by American astronomer Sherburne Wesley Burnham at Lick Observatory in 1889.[12] The pair orbit each other over a period of 74 years with a high eccentricity of 0.8.[3]

The magnitude 5.26[3] primary, designated component A, is an A-type main-sequence star based on a stellar classification of A1V[4] or A2V,[3] although it may have already left the main sequence.[7] It was identified as a candidate Lambda Boötis star, but this was ruled out by Paunzen et al. (2003) as it doesn't match the typical characteristics of these objects.[13] Although 2 Andromedae does not display a significant infrared excess, it is a shell star that displays varying absorption features due to circumstellar dust grains. This may indicate it has an orbiting debris disk containing gas that is being viewed edge-on.[14] The star is about 100 million years old and is spinning rapidly with a projected rotational velocity of 212 km/s.[8]

The magnitude 7.43[3] secondary companion, component B, is a suspected variable star and may be a Delta Scuti variable.[3] Alternatively, it may be an ellipsoidal variable with a brown dwarf companion.[7] It is an F-type main-sequence star with a class of F1V/F4.[3]

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 van Leeuwen2007
  2. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  3. ↑ a b c d e f g h i j k Cite error: Invalid <ref> tag; no text was provided for refs named Rica Romero2010
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Abt1995
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named EgUBV
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Gontcharov
  7. ↑ a b c d e f g h i j Cite error: Invalid <ref> tag; no text was provided for refs named Jerzykiewicz2015
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named zorec2012
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Gullikson2016
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named MAST
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Burnham1894
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Paunzen2003
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Roberge2008
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