HD 74423

HD 74423

A light curve for HD 74423 plotted from TESS data[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Volans[2]
Right ascension 08h 40m 17.985s[3]
Declination −64° 50′ 16.84″[3]
Apparent magnitude (V) 8.58–8.66[4]
Characteristics
Spectral type A7VkA0mA0 λ Boo[5]
Apparent magnitude (B) 8.81±0.02[6]
Apparent magnitude (J) 8.065±0.020[6]
Apparent magnitude (H) 8.021±0.067[6]
Apparent magnitude (K) 7.944±0.040[6]
Variable type α2 CVn[4] or Ellipsoidal and δ Sct[7]
Astrometry
Proper motion (μ) RA: −9.719[3] mas/yr
Dec.: 11.732[3] mas/yr
Parallax (π)2.1018 ± 0.0150 mas[3]
Distance1,550 ± 10 ly
(476 ± 3 pc)
Details
primary
Mass2.1[8] M☉
Radius3.3[8] R☉
Surface gravity (log g)3.6[5] cgs
Temperature7,900[8] K
Metallicity [Fe/H]−1.0[5] dex
secondary
Mass2.0[8] M☉
Radius3.2[8] R☉
Surface gravity (log g)3.6[5] cgs
Temperature7,600[8] K
Metallicity [Fe/H]−1.0[5] dex
Age800[7] Myr
Other designations
HD 74423, CD−64°342, SAO 250298, TYC 8934-1662-1, TIC 355151781
Database references
SIMBADdata

HD 74423 is a heartbeat binary star and one component pulsates on only one hemisphere. This is caused by tidal interaction with its partner.[7] The star is located in the Volans constellation.

HD 74423 is slightly variable in brightness. It fluctuates between magnitudes 8.58 and 8.66 every 19 hours.[4] The exact variability type is unclear. It was initially found in a search for α2 Canum Venaticorum variables and assumed to be one, but has since been considered to be a δ Scuti variable.[7] The spectrum shows unusually strong absorption lines of some iron peak elements, a characteristic of λ Boötis stars. Both components are thought to show the chemical peculiarity.[7]

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference DJM-2008 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference edr3 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference bernhard2015 was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference gray2017 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference :1 was invoked but never defined (see the help page).
  8. ^ a b c d e f Cite error: The named reference fuller2020 was invoked but never defined (see the help page).