Iota Phoenicis

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 mas[1]
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

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]

A light curve for Iota Phoenicis, plotted from TESS data,[10]

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.[11]

The proper motion companion[12] is a magnitude 12.8 star at an angular separation of 6.7″.[9]

  1. ^ a b c d e f g h Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Ducati2002 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Wilson1953 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference XHIP was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Sikora2018 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Frankowski2007 was invoked but never defined (see the help page).