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.
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] |
Distance | 1,550 ± 10 ly (476 ± 3 pc) |
Details | |
primary | |
Mass | 2.1[8] M☉ |
Radius | 3.3[8] R☉ |
Surface gravity (log g) | 3.6[5] cgs |
Temperature | 7,900[8] K |
Metallicity [Fe/H] | −1.0[5] dex |
secondary | |
Mass | 2.0[8] M☉ |
Radius | 3.2[8] R☉ |
Surface gravity (log g) | 3.6[5] cgs |
Temperature | 7,600[8] K |
Metallicity [Fe/H] | −1.0[5] dex |
Age | 800[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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]