AI Phoenicis

AI Phoenicis

A light curve for AI Phoenicis, plotted from TESS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Phoenix
Right ascension 01h 09m 34.19s[2]
Declination −46° 15′ 56.07″[2]
Apparent magnitude (V) 8.58 – 9.35[3]
Characteristics
Spectral type K0IV + F7V[4]
Variable type Algol[3]
Astrometry
Radial velocity (Rv)−0.750 ± 0.012[5] km/s
Proper motion (μ) RA: +56.27[2] mas/yr
Dec.: +0.70[2] mas/yr
Parallax (π)5.8336 ± 0.0262 mas[2]
Distance559 ± 3 ly
(171.4 ± 0.8 pc)
Absolute magnitude (MV)A: 3.29 ± 0.17[4]
B: 3.06 ± 0.13[4]
Orbit
Period (P)24.592483 ± 0.000017 days[6]
Semi-major axis (a)47.855 ± 0.019 R☉[5]
Eccentricity (e)0.1821 ± 0.0051[6]
Inclination (i)88.502 ± 0.039[6]°
Argument of periastron (ω)
(secondary)		110.73 ± 0.78[6]°
Semi-amplitude (K1)
(primary)		51.16 ± 0.03[5] km/s
Semi-amplitude (K2)
(secondary)		49.11 ± 0.02[5] km/s
Details
Metallicity [Fe/H]−0.14 ± 0.1[7] dex
Age4.39 ± 0.32[6] Gyr
Primary
Mass1.2473 ± 0.0039[6] M☉
Radius2.912 ± 0.014[6] R☉
Luminosity4.86+0.52
−0.46[4] L☉
Surface gravity (log g)3.595 ± 0.014[4] cgs
Temperature5,010 ± 120[4] K
Rotational velocity (v sin i)6 ± 1[7] km/s
Secondary
Mass1.1973 ± 0.0037[6] M☉
Radius1.835 ± 0.014[6] R☉
Luminosity4.70+0.49
−0.44[4] L☉
Surface gravity (log g)3.996 ± 0.011[4] cgs
Temperature6,310 ± 150[4] K
Rotational velocity (v sin i)4 ± 1[7] km/s
Other designations
AI Phe, CD−46°322, HD 6980, HIP 5438, SAO 215389[8]
Database references
SIMBADdata

AI Phoenicis is a variable star in the constellation of Phoenix. An Algol-type eclipsing binary, its apparent magnitude is constant at 8.58 for most of the time, sharply dropping to 9.35 during primary eclipse and to 8.89 during secondary eclipse.[3] The system's variability was discovered by W. Strohmeier in 1972.[9] From parallax measurements by the Gaia spacecraft, the system is located at a distance of 560 light-years (171 parsecs) from Earth,[2] in agreement with earlier estimates based on its luminosity (173 ± 11 parsecs).[4]

The primary star is a K-type subgiant with a spectral type of K0IV and an effective temperature of 5,000 K, while the secondary is an F-type main sequence star with a spectral type of F7V and a temperature of 6,300 K. The primary component, while visually fainter, is slightly more luminous than the secondary due to its higher infrared output.[4] The primary is at the end of its main sequence life and is likely in the short contraction phase known as a hook, where core hydrogen fusion has ceased but shell burning has not yet started, before ascending towards the red giant branch.[6] Photometric and spectroscopic observations have allowed the direct determination of the parameters of the stars with extreme precision, and this system is frequently used to test stellar evolution models.[7][4][6][10] The masses of the stars, 1.247 M☉ for the primary and 1.197 M☉ for the secondary, are known to a precision of just 0.3%, while the radii of 2.91 R☉ and 1.84 R☉ have uncertainties of 0.8% and 0.5% respectively.[6] Stellar evolution models show the stars have a common age of about 4.4 billion years.[6]

The orbit of AI Phoenicis has a period of 24.59248 days and a moderate eccentricity of 0.1821 ± 0.0051. The observation of eclipses is allowed by its 88.5° inclination to the plane of the sky. Times of minimum light show the orbital period of the system is not constant,[6] which can be caused by a third star in the system. An analysis of the alignment of the system by the Rossiter–McLaughlin effect suggests that the secondary star rotation axis is not aligned with the orbital axis, with an angle of 87 ± 17° between them, which also indicates interactions with a third star.[11]

Investigations continue with the TESS observatory in 2020.[12]

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference GCVS was invoked but never defined (see the help page).
  4. ^ a b c d e f g h i j k l Cite error: The named reference Torres2010 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Hełminiak2009 was invoked but never defined (see the help page).
  6. ^ a b c d e f g h i j k l m n Cite error: The named reference Kirkby-Kent2016 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Andersen1988 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. ^ Cite error: The named reference Strohmeier1972 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Higl2017 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Sybilski2018 was invoked but never defined (see the help page).
  12. ^ Maxted, P F L; Gaulme, Patrick; Graczyk, D; Hełminiak, K G; Johnston, C; Orosz, Jerome A; Prša, Andrej; Southworth, John; Torres, Guillermo; Davies, Guy R; Ball, Warrick; Chaplin, William J (11 October 2020). "The TESS light curve of AI Phoenicis". Monthly Notices of the Royal Astronomical Society. 498 (1): 332–343. arXiv:2003.09295. doi:10.1093/mnras/staa1662.