Iota Aquilae
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquila |
Right ascension | 19h 36m 43.27606s[1] |
Declination | –01° 17′ 11.7611″[1] |
Apparent magnitude (V) | 4.364[2] |
Characteristics | |
Spectral type | B5 III[3] |
U−B color index | –0.428[2] |
B−V color index | –0.083[2] |
R−I color index | –0.08 |
Astrometry | |
Radial velocity (Rv) | –21.4[4] km/s |
Proper motion ( | RA: –0.87[1] mas/yr Dec.: –20.39[1] mas/yr |
Parallax ( | 8.34 ± 0.79 mas[1] |
Distance | 390 ± 40 ly (120 ± 10 pc) |
Absolute magnitude (MV) | −1.01[5] |
Details | |
Mass | 4.8 ± 0.3[6] M☉ |
Radius | 5.5 ± 0.5[6] R☉ |
Luminosity | 851[6] L☉ |
Surface gravity (log g) | 3.64 ± 0.05[6] cgs |
Temperature | 14,552[7] K |
Metallicity [Fe/H] | 0.09±0.04[5] dex |
Rotational velocity (v sin i) | 55[8] km/s |
Age | 100 ± 8[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Iota Aquilae, Latinized from
Although Iota Aquilae is listed in star catalogues as a giant star, calculations of its dimension show that in reality it is a main-sequence star.[10] It has nearly five times the mass of the Sun and five to six times the Sun's radius.[6] It is emitting 851[6] times the luminosity of the Sun from its outer atmosphere at an effective temperature of 14,552 K,[7] giving it the blue-white hue of a B-type star. The projected rotational velocity of this star is 55 km/s.[8] Even though it is only around 100 million years old, it has already spent 91% of its allotted lifetime on the main sequence.[6]
Nomenclature
[edit]In Chinese,
This star, together with
References
[edit]- ^ a b c d e f 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.
- ^ a b c d Kozok, J. R. (September 1985), "Photometric observations of emission B-stars in the southern Milky Way", Astronomy and Astrophysics Supplement Series, 61: 387–405, Bibcode:1985A&AS...61..387K.
- ^ Lesh, Janet Rountree (December 1968), "The Kinematics of the Gould Belt: an Expanding Group?", Astrophysical Journal Supplement, 17: 371, Bibcode:1968ApJS...17..371L, doi:10.1086/190179.
- ^ Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick (eds.), "The Revision of the General Catalogue of Radial Velocities, in Determination of Radial Velocities and their Applications, Proceedings from I
AU Symposium no. 30", Determination of Radial Velocities and Their Applications, 30, University of Toronto: International Astronomical Union (published 1967): 57–63, Bibcode:1967IAUS...30...57E. - ^ a b 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.
- ^ a b c d e f g h i Lyubimkov, Leonid S.; et al. (June 2002), "Surface abundances of light elements for a large sample of early B-type stars - II. Basic parameters of 107 stars", Monthly Notices of the Royal Astronomical Society, 333 (1): 9–26, Bibcode:2002MNRAS.333....9L, doi:10.1046/j.1365-8711.2002.05341.x
- ^ a b Underhill, A. B.; et al. (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.
- ^ a b 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.
- ^ "iot Aql -- Star in double system", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-18.
- ^ Kaler, James B., Al Thalimain (Iota Aquilae), university of Illinois, archived from the original on 2012-02-17, retrieved 2012-07-18
- ^ (in Chinese)
中國 星座 神話 , written by陳 久金 . Published by台灣 書房 出版 有限 公司 , 2005, ISBN 978-986-7332-25-7. - ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy)
天文 教育 資 訊網 2006年 7月 3日 - ^ Ian Ridpath's Star Tales – Antinous