Astronomy:Xi Andromedae

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Short description: K-type giant star in the constellation Andromeda
Not to be confused with 11 Andromedae. For Andromeda's satellite galaxy, see Andromeda XI.
Xi Andromedae
Diagram showing star positions and boundaries of the Andromeda constellation and its surroundings
12px
Location of ξ Andromedae (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Andromeda
Right ascension  01h 22m 20.42008s[1]
Declination +45° 31′ 43.5962″[1]
Apparent magnitude (V) +4.90[2]
Characteristics
Evolutionary stage red clump[3]
Spectral type K0 IIIb[4]
U−B color index +0.98[2]
B−V color index +1.08[2]
Astrometry
Radial velocity (Rv)−12.59[5] km/s
Proper motion (μ) RA: +31.681(102)[1] mas/yr
Dec.: +9.024(88)[1] mas/yr
Parallax (π)14.6042 ± 0.1028[1] mas
Distance223 ± 2 ly
(68.5 ± 0.5 pc)
Absolute magnitude (MV)0.550[3]
Details
Mass2.5[3] M☉
Radius10[6] R☉
Luminosity45.7[6] L☉
Surface gravity (log g)2.65±0.11[7] cgs
Temperature4,842±92[7] K
Metallicity [Fe/H]+0.03[6] dex
Rotational velocity (v sin i)0.0[6] km/s
Age2.0+2.5
−1.1[7] Gyr
Other designations
Adhil, ξ Andromedae, Xi And, ξ And, 46 Andromedae, BD+44 287, FK5 1035, HD 8207, HIP 6411, HR 390, SAO 37155, PPM 43919[8]
Database references
SIMBADdata

Xi Andromedae is a solitary[4] star in the northern constellation of Andromeda. It has the proper name Adhil, pronounced /əˈdɪl/;[9][10] the Bayer designation is Latinized from ξ Andromedae, abbreviated Xi And or ξ And, respectively. The star has an apparent magnitude of +4.9,[2] which is bright enough to be faintly visible to the naked eye at night. Based on parallax measurements obtained during the Gaia mission, it lies at a distance of roughly 223 light-years (68 parsecs) from the Sun.[1] It is drifting closer with a heliocentric radial velocity of –12.6 km/s.[5]

Nomenclature

It bore the traditional name Adhil, which is derived from the Arabic الذيل að-ðayl "the train" (lit. "the tail"). In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[11] to catalogue and standardize proper names for stars. The WGSN approved the name Adhil for this star on 21 August 2016 and it is now so included in the List of IAU-approved Star Names.[10]

Properties

This is a red clump giant star that has begun generating energy through the fusion of helium at its core, having passed through the red giant branch of its evolution.[3] It has a stellar classification of K0 IIIb,[4] with 2.5[3] times the mass of the Sun and 10[6] times the Sun's radius. Xi Andromedae is emitting nearly 46[6] times as much luminosity as the Sun from its outer envelope at an effective temperature of 4,842 K,[7] giving it the orange-hued glow of a K-type star. It has no measurable projected rotational velocity,[6] although this could mean that the star's pole of rotation is facing in the general direction of the Earth.

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Mishenina, T. V. et al. (September 2006), "Elemental abundances in the atmosphere of clump giants", Astronomy and Astrophysics 456 (3): 1109–1120, doi:10.1051/0004-6361:20065141, Bibcode: 2006A&A...456.1109M. 
  4. ↑ 4.0 4.1 4.2 Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.  Note that the 1991 Bright Star Catalogue has listed this as a spectroscopic binary with a period of 17.7673d.
  5. ↑ 5.0 5.1 Famaey, B. et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics 430 (1): 165–186, doi:10.1051/0004-6361:20041272, Bibcode: 2005A&A...430..165F. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 Massarotti, Alessandro et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal 135 (1): 209–231, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M. 
  7. ↑ 7.0 7.1 7.2 7.3 Feuillet, Diane K. et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal 817 (1): 40, doi:10.3847/0004-637X/817/1/40, Bibcode: 2016ApJ...817...40F. 
  8. ↑ "ksi And". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ksi+And. 
  9. ↑ Kunitzsch, Paul; Smart, Tim (2006), A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.), Cambridge, Massachusetts: Sky Publishing Company, ISBN 978-1-931559-44-7. 
  10. ↑ 10.0 10.1 Naming Stars, IAU.org, https://www.iau.org/public/themes/naming_stars/, retrieved 18 June 2018. 
  11. ↑ IAU Working Group on Star Names (WGSN), International Astronomical Union, https://www.iau.org/science/scientific_bodies/working_groups/280/, retrieved 22 May 2016. 



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