Iota Phoenicis

ι Phoenicis, Latinized as Iota Phoenicis, is a binary star[9] system in the southern constellation of Phoenix, near the constellation border with Grus. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude that fluctuates around 4.71.[2] This system lies approximately 254 light years from the Sun based on parallax, and it is drifting further away with a radial velocity of +19.4 km/s.[4]

Iota Phoenicis
Location of ι Phoenicis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Phoenix
Right ascension  23h 35m 04.57082s[1]
Declination −42° 36′ 54.5409″[1]
Apparent magnitude (V) 4.71[2] (4.70 - 4.75)[3]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A2VpSrCrEu[3]
U−B color index +0.07[2]
B−V color index +0.08[2]
Variable type α2 CVn[3]
Astrometry
Radial velocity (Rv)+19.4[4] km/s
Proper motion (μ) RA: +39.908[1] mas/yr
Dec.: + 10.844[1] mas/yr
Parallax (π)12.8425 ± 0.3922[1] mas
Distance254 ± 8 ly
(78 ± 2 pc)
Absolute magnitude (MV)0.28[5]
Details
Mass2.23[6] M☉
Radius5.07+0.51
−0.42[1] R☉
Luminosity68.2±3.3[1] L☉
Surface gravity (log g)3.89[6] cgs
Temperature7,370+320
−350[1] K
Metallicity [Fe/H]-0.01[7] dex
Rotational velocity (v sin i)23[6] km/s
Age573[6] Myr
Other designations
ι Phe, CD−43°15420, FK5 1617, HD 221760, HIP 116389, HR 8949, SAO 231675, CCDM J23351-4237A, WDS J23351-4237A[8]
Database references
SIMBADdata

The primary component is an Ap star on the main sequence with a stellar classification of A2VpSrCrEu,[3] where the suffix notation indicates abnormal abundances of strontium, chromium, and europium in the stellar atmosphere. It is an Alpha2 Canum Venaticorum variable; its apparent magnitude varies from 4.70 down to 4.75 with a period of 12.5 days.[3] A rotationally-modulated magnetic field has been measured, varying from −72±9 G to 57±9 G. It has an estimated rotation period of 5.98±0.06 d, although this is in need of further confirmation.[10]

The proper motion companion[11] is a magnitude 12.8 star at an angular separation of 6.7″.[9]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, retrieved 2019-08-06.
  4. Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W. LCCN 54001336.
  5. 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. Vizier catalog entry
  6. David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146.
  7. Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. Vizier catalog entry
  8. "iot Phe". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-06.
  9. Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  10. Sikora, J.; et al. (March 2019), "A volume-limited survey of mCP stars within 100 pc II: rotational and magnetic properties", Monthly Notices of the Royal Astronomical Society, 483 (3): 3127–3145, arXiv:1811.05635, Bibcode:2019MNRAS.483.3127S, doi:10.1093/mnras/sty2895.
  11. Frankowski, A.; et al. (March 2007), "Proper-motion binaries in the Hipparcos catalogue. Comparison with radial velocity data", Astronomy and Astrophysics, 464 (1): 377–392, arXiv:astro-ph/0612449, Bibcode:2007A&A...464..377F, doi:10.1051/0004-6361:20065526
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