Astronomy:Iota Coronae Borealis
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Short description: Binary star system in the constellation Corona Borealis
| Observation data 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[1] mas |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 Fernie, J. D. (1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series 52: 7, doi:10.1086/190856, Bibcode: 1983ApJS...52....7F.
- ↑ 3.0 3.1 Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement 99: 135, doi:10.1086/192182, Bibcode: 1995ApJS...99..135A.
- ↑ 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 6.2 Pourbaix, D. et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy and Astrophysics 424 (2): 727–732, doi:10.1051/0004-6361:20041213, Bibcode: 2004A&A...424..727P.
- ↑ McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ 8.0 8.1 8.2 Prugniel, Ph.; Vauglin, I.; Koleva, M. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics 531: A165, doi:10.1051/0004-6361/201116769, Bibcode: 2011A&A...531A.165P.
- ↑ 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, doi:10.1051/0004-6361:20020943, Bibcode: 2002A&A...393..897R.
- ↑ "iot CrB". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=iot+CrB.
- ↑ Dubaj, D.; Monier, R.; Alecian, G.; Leblanc, F. (December 2005), "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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