Iota Andromedae

This article is about the star. For the galaxy, see Andromeda I. For another star, see 1 Andromedae.

"ι And" redirects here. For other uses, see And I (disambiguation).

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]

Iota Andromedae

Location of ι Andromedae (circled)
Observation data Epoch J2000      Equinox J2000
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 mas[1]
Distance	500 ± 10 ly (153 ± 4 pc)
Absolute magnitude (MV)	−1.63[7]
Details
Mass	3.1 M☉[4] 3.98±0.06[8] M☉
Radius	4.6[9] R☉
Luminosity	638[7] L☉
Surface gravity (log g)	3.35[6] cgs
Temperature	12,620[10] K
Metallicity [Fe/H]	−0.19±0.14[6] dex
Rotational velocity (v sin i)	70[11] km/s
Age	116[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
SIMBAD	data

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. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600
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, 35 (35), Astronomisches Rechen-Institut Heidelberg: 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, Bibcode:1958ApJ...128..185C, doi:10.1086/146536.
4. Gullikson, Kevin; et al. (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 40, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40, S2CID 119179065.
5. 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. 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, Bibcode:2003A&A...406..975K, doi:10.1051/0004-6361:20030620
7. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
8. Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
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, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601.
10. 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, arXiv:0903.5134, Bibcode:2009A&A...501..297Z, doi:10.1051/0004-6361/200811147, S2CID 14969137.
11. Abt, Helmut A.; et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
12. "iot And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-06-01.{{cite web}}: CS1 maint: postscript (link)
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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
14. Ishihara, Daisuke; et al. (May 2017), "Faint warm debris disks around nearby bright stars explored by AKARI and IRSF", Astronomy & Astrophysics, 601: 18, arXiv:1608.04480, Bibcode:2017A&A...601A..72I, doi:10.1051/0004-6361/201526215, S2CID 55234482, A72.
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, Bibcode:1895MNRAS..55..429K, doi:10.1093/mnras/55.8.429.
16. (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日 Archived 2011-05-21 at the Wayback Machine