| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Phoenix |
| Right ascension | 00h 50m 03.77s [2] |
| Declination | −43° 23′ 41.92″ [2] |
| Apparent magnitude (V) | 6.47 [3] |
| Characteristics | |
| Spectral type | A9/F0III [4] |
| Variable type | δ Scuti [3] |
| Astrometry | |
| Radial velocity (Rv) | 11.9 [5] km/s |
| Proper motion (μ) | RA: 6.65 [2] mas/yr Dec.: 25.03 [2] mas/yr |
| Parallax (π) | 10.1141±0.0578 mas [2] |
| Distance | 322 ± 2 ly (98.9 ± 0.6 pc) |
| Absolute magnitude (MV) | 1.65 ± 0.30 [6] |
| Details | |
| Radius | 2.70 [2] R☉ |
| Luminosity | 18.6+5.9 −4.5 [6] L☉ |
| Surface gravity (log g) | 3.78 ± 0.08 [6] cgs |
| Temperature | 7,278 ± 34 [6] K |
| Metallicity | [Z] = +0.52 ± 0.15 [6] |
| Other designations | |
| AZ Phe, CD−44°216, HD 4849, HIP 3903, HR 239, SAO 215254 [7] | |
| Database references | |
| SIMBAD | data |
AZ Phoenicis (HR 239) is a variable star in the constellation of Phoenix. It has an average visual apparent magnitude of 6.47, [3] so it is at the limit of naked eye visibility. From parallax measurements by the Gaia spacecraft, it is located at a distance of 322 light-years (99 parsecs ) from Earth. [2] Its absolute magnitude is calculated at 1.65. [6]
AZ Phoenicis is a Delta Scuti variable that pulsates with a single period of 79.3 minutes, [1] causing its visual brightness to vary with an amplitude of 0.015 magnitudes. [3] Its variability was discovered by Werner Weiss in 1977, from observations with the 50-cm telescope at La Silla Observatory. [8] AZ Phoenicis has also been classified as a possible Ap star, which remains uncertain, even though the star has a large concentration of metals; [1] the overall metallicity of the star has been measured to about 3 times the solar metallicity. [6]
This star is classified with a spectral type of A9/F0III, [4] corresponding to a giant of type A or F. With an estimated radius of 2.7 times the solar radius, [2] it is shining with 19 times the solar luminosity at an effective temperature of 7,280 K. [6] The astrometric observations by the Hipparcos spacecraft detected a significant acceleration in the proper motion of AZ Phoenicis, indicating it is an astrometric binary. [9]
