108 Aquarii

108 Aquarii
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquarius
Right ascension	23h 51m 21.33832s[1]
Declination	–18° 54′ 32.9937″[1]
Apparent magnitude (V)	5.194[2]
Characteristics
Spectral type	A0VpSiSr[3]
U−B color index	–0.396[2]
B−V color index	–0.135[2]
Variable type	α² CVn[4]
Astrometry
Radial velocity (Rv)	+12.7[5] km/s
Proper motion (μ)	RA: +26.82[1] mas/yr ; Dec.: –4.27[1] mas/yr
Parallax (π)	10.23 ± 0.31[1] mas
Distance	319 ± 10 ly ; (98 ± 3 pc)
Absolute magnitude (MV)	+0.08[6]
Details
Mass	3.21 ± 0.15[6] M☉
Radius	2.5 ± 0.3[6] R☉
Luminosity	132[6] L☉
Surface gravity (log g)	4.27 ± 0.10[6] cgs
Temperature	12,274[6] K
Metallicity [Fe/H]	+0.90[7] dex
Rotation	3.74 days[6]
Rotational velocity (v sin i)	30[8] km/s
Other designations
	BD−19°6522, HD 223640, HIP 117629, HR 9031, SAO 165918[4]
Database references
SIMBAD	data

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[2] and can be seen with the naked eye under suitably dark skies. Based upon an annual parallax shift of 10.23[1] (with a 3% margin of error), the distance to this star is 319 light-years (98 parsecs).

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.[6] 108 Aquarii is radiating 132[6] times the luminosity of the Sun from its outer atmosphere at an effective temperature of 12,274 K.[6] At this heat, the star has the white hue of an A-type star.[9]

References

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.
Gutierrez-Moreno, Adelina; et al. (1966), A System of photometric standards, 1, Publicaciones Universidad de Chile, Department de Astronomy, pp. 1–17, Bibcode:1966PDAUC...1....1G.
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
"* i03 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-15.
Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W.
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.
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.
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.
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.

External links

Image ET Aquarii

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[aaa474_2_653-1] 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.

[sps1966-2] Gutierrez-Moreno, Adelina; et al. (1966), A System of photometric standards, 1, Publicaciones Universidad de Chile, Department de Astronomy, pp. 1–17, Bibcode:1966PDAUC...1....1G.

[abt-3] 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

[SIMBAD-4] "* i03 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-15.

[gcsrv1953-5] Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W.

[aaa334_181-6] 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.

[ap_stars-7] 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.

[apj573_1-8] 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.

[mnras131_95-9] 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.