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108 Aquarii (abbreviated 108 Aqr) is a star in the equatorial constellation of Aquarius. 108 Aquarii is the Flamsteed designation, although it also bears the Bayer designation i3 Aquarii and the variable star designation ET Aquarii. It has an apparent visual magnitude of 5.194[3] and can be seen with the naked eye under suitably dark skies. Based upon an annual parallax shift of 10.23[2] (with a 3% margin of error), the distance to this star is 319 light-years (98 parsecs).

This article is about i3 Aquarii. For other star systems with this Bayer designation, see i Aquarii.
108 Aquarii

The visual band light curve of 108 Aquarii, showing the variation over the star's 3.7352 day rotation period. Adapted from Adelman (1999)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 23h 51m 21.33832s[2]
Declination –18° 54′ 32.9937″[2]
Apparent magnitude (V) 5.194[3]
Characteristics
Spectral type A0VpSiSr[4]
U−B color index –0.396[3]
B−V color index –0.135[3]
Variable type α² CVn[5]
Astrometry
Radial velocity (Rv)+12.7[6] km/s
Proper motion (μ) RA: +26.82[2] mas/yr
Dec.: –4.27[2] mas/yr
Parallax (π)10.23 ± 0.31 mas[2]
Distance319 ± 10 ly
(98 ± 3 pc)
Absolute magnitude (MV)+0.08[7]
Details
Mass3.21 ± 0.15[7] M☉
Radius2.5 ± 0.3[7] R☉
Luminosity132[7] L☉
Surface gravity (log g)4.27 ± 0.10[7] cgs
Temperature12,274[7] K
Metallicity [Fe/H]+0.90[8] dex
Rotation3.75413 days[9]
Rotational velocity (v sin i)30[10] km/s
Other designations
BD−19°6522, HD 223640, HIP 117629, HR 9031, SAO 165918[5]
Database references
SIMBADdata

This is an Ap star; meaning it has a peculiar spectrum that shows an overabundance of certain elements. It has more than three times the mass of the Sun and is 2.5 times the Sun's radius.[7] 108 Aquarii is radiating 132[7] times the luminosity of the Sun from its outer atmosphere at an effective temperature of 12,274 K.[7] At this heat, the star has the white hue of an A-type star.[11]


References


  1. Adelman, Saul J. (January 1999). "Variability of the uvby Light Curves of the Magnetic CP Star 108 Aquarii". Baltic Astronomy. 8: 369–383. doi:10.1515/astro-1999-0304. Retrieved 16 October 2021.
  2. 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.
  3. Gutierrez-Moreno, Adelina; et al. (1966), "A System of photometric standards", Publications of the Department of Astronomy University of Chile, Publicaciones Universidad de Chile, Department de Astronomy, 1: 1–17, Bibcode:1966PDAUC...1....1G.
  4. Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", The Astrophysical Journal Supplement Series, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182
  5. "* i03 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-15.
  6. Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W.
  7. North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics, 334: 181–187, arXiv:astro-ph/9802286, Bibcode:1998A&A...334..181N.
  8. Vilhu, O.; Tuominen, I. V.; Boyarchuk, A. A. (1976), "Abundance Studies of Peculiar B Stars", in Weiss, W. W.; Jenkner, H.; Wood, H. J. (eds.), Physics of Ap Stars, Proceedings of IAU Colloq. 32, held in Vienna, Austria, 8-11 September, 1976, Universitatssternwarte Wien, p. 563, Bibcode:1976paps.coll..563V.
  9. Barraza, L. F.; Gomes, R. L.; Messias, Y. S.; Leão, I. C.; Almeida, L. A.; Janot-Pacheco, E.; Brito, A. C.; Brito, F. A. C.; Santana, J. V.; Gonçalves, N. S.; Das Chagas, M. L.; Teixeira, M. A.; De Medeiros, J. R.; Canto Martins, B. L. (2022). "Rotation Signature of TESS B-type Stars. A Comprehensive Analysis". The Astrophysical Journal. 924 (2): 117. arXiv:2202.01022. Bibcode:2022ApJ...924..117B. doi:10.3847/1538-4357/ac3335. S2CID 246030494.
  10. Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
  11. Przybylski, A.; Kennedy, P. M. (1965), "Radial velocities and three-colour photometry of 166 southern stars", Monthly Notices of the Royal Astronomical Society, 131: 95–104, Bibcode:1965MNRAS.131...95P, doi:10.1093/mnras/131.1.95.



На других языках

- [en] 108 Aquarii

[es] ET Aquarii

ET Aquarii (ET Aqr / i3 Aquarii / 108 Aquarii / HD 223640)[1] es una estrella variable en la constelación de Acuario. Se encuentra a 321 años luz de distancia del Sistema Solar.

[ru] 108 Водолея

108 Водолея (лат. 108 Aquarii), i³ Водолея (лат. i³ Aquarii), ET Водолея (лат. ET Aquarii), HD 223640 — одиночная переменная звезда в созвездии Водолея на расстоянии приблизительно 330 световых лет (около 101 парсека) от Солнца. Видимая звёздная величина звезды — от +5,21m до +5,12m[8].


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