Astronomy:Iota Andromedae

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Short description: Star in the constellation of Andromeda
Iota Andromedae
Andromeda IAU.svg
Red circle.svg
Location of ι Andromedae (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Andromeda
Right ascension  23h 38m 08.20130s[1]
Declination +43° 16′ 05.0649″[1]
Apparent magnitude (V) +4.29[2]
Characteristics
Evolutionary stage main sequence
Spectral type B8 V[3][4]
U−B color index –0.29[5]
B−V color index –0.11[5]
Variable type constant[6]
Astrometry
Radial velocity (Rv)–0.5[2] km/s
Proper motion (μ) RA: +27.64[1] mas/yr
Dec.: -1.02[1] mas/yr
Parallax (π)6.53 ± 0.16[1] mas
Distance500 ± 10 ly
(153 ± 4 pc)
Absolute magnitude (MV)−1.63[7]
Details
Mass3.1 M☉[4]
3.98±0.06[8] M☉
Radius4.6[9] R☉
Luminosity638[7] L☉
Surface gravity (log g)3.35[6] cgs
Temperature12,620[10] K
Metallicity [Fe/H]−0.19±0.14[6] dex
Rotational velocity (v sin i)70[11] km/s
Age116[4] Myr
Other designations
ι And, 17 And, BD+42°4720, FK5 891, HD 222173, HIP 116631, HR 8965, SAO 53216, PPM 64473[12]
Database references
SIMBADdata

Iota Andromedae is a single[13] star in the northern constellation of Andromeda. It has the Flamsteed designation 17 Andromedae, while Iota Andromedae is the Bayer designation as Latinized from ι Andromedae. This object is visible to the naked eye at night as a faint, blue-white hued star with an apparent visual magnitude of +4.29.[2] Based upon parallax measurements, it is located approximately 500 light years distant from the Sun.[1]

This object is a B-type main-sequence star with a stellar classification of B8 V. It is among the least variable stars observed during the Hipparcos mission.[6] The star is 116[4] million years old with 3.1[4] times the mass of the Sun and is spinning with a projected rotational velocity of 70 km/s.[11] It is radiating 638[7] times the luminosity of the Sun from its photosphere at an effective temperature of 12,620 K.[10] The star is somewhat metal-poor, although the abundance of helium is close to solar. The latter excludes it from membership among the class of peculiar stars.[6] Iota Andromedae is a debris disk candidate, showing an infrared excess at a wavelength of 18 μm.[14]

Name

In the catalogue of stars in the Calendarium of Al Achsasi Al Mouakket, this star was designated Keff al-Salsalat (كف المسلسلة - kaf al-musalsala), which was translated into Latin as Manus Catenata, meaning palm of chained woman.[15]

In Chinese, 螣蛇 (Téng Shé), meaning Flying Serpent, refers to an asterism consisting of ι Andromedae, α Lacertae, 4 Lacertae, π2 Cygni, π1 Cygni, HD 206267, ε Cephei, β Lacertae, σ Cassiopeiae, ρ Cassiopeiae, τ Cassiopeiae, AR Cassiopeiae, 9 Lacertae, 3 Andromedae, 7 Andromedae, 8 Andromedae, λ Andromedae, κ Andromedae and ψ Andromedae. Consequently, the Chinese name for ι Andromedae itself is 螣蛇二十二 (Téng Shé èrshíèr, English: the Twenty Second Star of Flying Serpent).[16]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V 
  2. ↑ 2.0 2.1 2.2 Wielen, R. et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg (Astronomisches Rechen-Institut Heidelberg) 35 (35): 1, Bibcode: 1999VeARI..35....1W. 
  3. ↑ Crawford, David L. (September 1958), "Two-Dimensional Spectral Classification by Narrow-Band Photometry for B Stats in Clusters and Associations", Astrophysical Journal 128: 185, doi:10.1086/146536, Bibcode: 1958ApJ...128..185C. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Gullikson, Kevin et al. (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal 152 (2): 40, doi:10.3847/0004-6256/152/2/40, Bibcode: 2016AJ....152...40G. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 Kocer, D. et al. (August 2003), "Elemental abundance analyses with DAO spectrograms. XXVII. The superficially normal stars theta And (A2 IV), epsilon Del (B6 III), epsilon Aqr (A1.5 V), and iota And (B9 V)", Astronomy and Astrophysics 406 (3): 975–980, doi:10.1051/0004-6361:20030620, Bibcode: 2003A&A...406..975K 
  7. ↑ 7.0 7.1 7.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  8. ↑ Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z. 
  9. ↑ Underhill, A. B.; Divan, L.; Prevot-Burnichon, M. -L.; Doazan, V. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars.", Monthly Notices of the Royal Astronomical Society 189 (3): 601–605, doi:10.1093/mnras/189.3.601, Bibcode: 1979MNRAS.189..601U. 
  10. ↑ 10.0 10.1 Zorec, J. et al. (July 2009), "Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ_1, D) parameters into Teff", Astronomy and Astrophysics 501 (1): 297–320, doi:10.1051/0004-6361/200811147, Bibcode: 2009A&A...501..297Z. 
  11. ↑ 11.0 11.1 Abt, Helmut A. et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal 573 (1): 359–365, doi:10.1086/340590, Bibcode: 2002ApJ...573..359A. 
  12. ↑ "iot And". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=iot+And. 
  13. ↑ 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. 
  14. ↑ Ishihara, Daisuke et al. (May 2017), "Faint warm debris disks around nearby bright stars explored by AKARI and IRSF", Astronomy & Astrophysics 601: 18, doi:10.1051/0004-6361/201526215, A72, Bibcode: 2017A&A...601A..72I. 
  15. ↑ Knobel, E. B. (June 1895), "Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket", Monthly Notices of the Royal Astronomical Society 55: 429, doi:10.1093/mnras/55.8.429, Bibcode: 1895MNRAS..55..429K. 
  16. ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日



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