| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Corona Borealis |
| Right ascension | 16h 01m 26.56488s [1] |
| Declination | +29° 51′ 03.8243″ [1] |
| Apparent magnitude (V) | 4.96 [2] |
| Characteristics | |
| Spectral type | A0 IIIp(HgMnEu)s [3] |
| U−B color index | −0.15 [2] |
| B−V color index | −0.06 [2] |
| Astrometry | |
| Radial velocity (Rv) | −20.8±0.4 [4] km/s |
| Proper motion (μ) |
RA: −38.31
[1]
mas/
yr Dec.: −6.56 [1] mas/ yr |
| Parallax (π) | 10.46 ± 0.24 mas [1] |
| Distance | 312 ± 7
ly (96 ± 2 pc) |
| Absolute magnitude (MV) | +0.08 [5] |
| Orbit [6] | |
| 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 [7] L☉ |
| Surface gravity (log g) | 3.84±0.16 [8] cgs |
| Temperature | 10,727±278 [8] K |
| Metallicity [Fe/H] | −0.01±0.12 [8] dex |
| Rotational velocity (v sin i) | 18 [9] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Iota Coronae Borealis, Latinized from ι Coronae Borealis, is a binary star [6] system in the constellation Corona Borealis. It is visible to the naked eye with a combined apparent visual magnitude of is 4.96. [2] Based upon an annual parallax shift of 10.46 mas as seen from the Earth, [1] 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. [6] The visible member, component A, has a stellar classification of A0 IIIp(HgMnEu)s, [3] 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. [11]
References
- ^ a b c d e f 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.
- ^ a b c d Fernie, J. D. (1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series, 52: 7, Bibcode: 1983ApJS...52....7F, doi: 10.1086/190856.
- ^ a b 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.
- ^ a b c 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.
- ^ a b c 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.