AZ Phoenicis

AZ Phoenicis

A blue band light curve for AZ Phoenicis, adapted from Kreidl (1985)[1]
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]
Distance322 ± 2 ly
(98.9 ± 0.6 pc)
Absolute magnitude (MV)1.65 ± 0.30[6]
Details
Radius2.70[2] R☉
Luminosity18.6+5.9
−4.5[6] L☉
Surface gravity (log g)3.78 ± 0.08[6] cgs
Temperature7,278 ± 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
SIMBADdata

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]

  1. ^ a b c Cite error: The named reference Kreidl1985 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference GCVS was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b c d e f g h Cite error: The named reference Paunzen2002 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Weiss1977 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Makarov2005 was invoked but never defined (see the help page).