Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
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Constellation | Corona Borealis |
Right ascension | 16 01 26.56488 |
Declination | +29° 51′ 03.8243″ |
Apparent magnitude (V) | 4.96 |
Characteristics | |
Spectral type | A0 IIIp(HgMnEu)s |
U−B color index | −0.15 |
B−V color index | −0.06 |
Astrometry | |
Radial velocity (Rv) | −20.8±0.4 km/s |
Proper motion (μ) | RA: −38.31 mas/yr Dec.: −6.56 mas/yr |
Parallax (π) | 10.46 ± 0.24 mas |
Distance | 312 ± 7 ly (96 ± 2 pc) |
Absolute magnitude (MV) | +0.08 |
Orbit | |
Period (P) | 35.474 d |
Eccentricity (e) | 0.56 |
Periastron epoch (T) | 2441566.96 JD |
Argument of periastron (ω) (secondary) | 156° |
Semi-amplitude (K1) (primary) | 2.3 km/s |
Details | |
ι CrB A | |
Luminosity | 90 L☉ |
Surface gravity (log g) | 3.84±0.16 cgs |
Temperature | 10,727±278 K |
Metallicity | −0.01±0.12 dex |
Rotational velocity (v sin i) | 18 km/s |
Other designations | |
ι CrB, 14 CrB, BD+30°2738, HD 143807, HIP 78493, HR 5971, SAO 84152 | |
Database references | |
SIMBAD | data |
Iota Coronae Borealis, Latinized from ι Coronae Borealis, is a binary star system in the constellation Corona Borealis. It is visible to the naked eye with a combined apparent visual magnitude of is 4.96. Based upon an annual parallax shift of 10.46 mas as seen from the Earth, it is located about 312 light years from the Sun.
This is a single-lined spectroscopic binary with an orbital period of 35.5 days and an eccentricity of 0.56. The visible member, component A, has a stellar classification of A0 IIIp(HgMnEu)s, indicating it is a chemically peculiar mercury-manganese star with narrow absorption lines. The secondary member, component B, appears to be an A-type star.
References
- ^ van Leeuwen, F. (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.
- ^ Fernie, J. D. (1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series, 52: 7, Bibcode:1983ApJS...52....7F, doi:10.1086/190856.
- ^ Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.
- de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- 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.
- ^ Pourbaix, D.; et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy and Astrophysics, 424 (2): 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
- McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ Prugniel, Ph.; Vauglin, I.; Koleva, M. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, S2CID 54940439.
- Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393: 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943, S2CID 14070763.
- "iot CrB", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-05-05.
- Dubaj, D.; Monier, R.; Alecian, G.; Leblanc, F. (December 2005), Casoli, F.; Contini, T.; Hameury, J.M.; Pagani, L. (eds.), "Abundance determinations for the two components of the spectroscopic binary star HD143807", SF2A-2005: Semaine de l'Astrophysique Française, EdP-Sciences: 335, Bibcode:2005sf2a.conf..335D.
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