 A blue band light curve for AZ Phoenicis, adapted from Kreidl (1985) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Phoenix |
| Right ascension | 00 50 03.77 |
| Declination | −43° 23′ 41.92″ |
| Apparent magnitude (V) | 6.47 |
| Characteristics | |
| Spectral type | A9/F0III |
| Variable type | δ Scuti |
| Astrometry | |
| Radial velocity (Rv) | 11.9 km/s |
| Proper motion (μ) | RA: 6.65 mas/yr Dec.: 25.03 mas/yr |
| Parallax (π) | 10.1141 ± 0.0578 mas |
| Distance | 322 ± 2 ly (98.9 ± 0.6 pc) |
| Absolute magnitude (MV) | 1.65 ± 0.30 |
| Details | |
| Radius | 2.70 R☉ |
| Luminosity | 18.6 −4.5 L☉ |
| Surface gravity (log g) | 3.78 ± 0.08 cgs |
| Temperature | 7,278 ± 34 K |
| Metallicity | = +0.52 ± 0.15 |
| Other designations | |
| AZ Phe, CD−44°216, HD 4849, HIP 3903, HR 239, SAO 215254 | |
| 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, 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. Its absolute magnitude is calculated at 1.65.
AZ Phoenicis is a Delta Scuti variable that pulsates with a single period of 79.3 minutes, causing its visual brightness to vary with an amplitude of 0.015 magnitudes. Its variability was discovered by Werner Weiss in 1977, from observations with the 50-cm telescope at La Silla Observatory. AZ Phoenicis has also been classified as a possible Ap star, which remains uncertain, even though the star has a large concentration of metals; the overall metallicity of the star has been measured to about 3 times the solar metallicity.
This star is classified with a spectral type of A9/F0III, corresponding to a giant of type A or F. With an estimated radius of 2.7 times the solar radius, it is shining with 19 times the solar luminosity at an effective temperature of 7,280 K. The astrometric observations by the Hipparcos spacecraft detected a significant acceleration in the proper motion of AZ Phoenicis, indicating it is an astrometric binary.
References
- ^ Kreidl, T. J. (1985). "Differential photometry of the δ Sct stars HR 151 and HR 239". Monthly Notices of the Royal Astronomical Society. 216 (4): 1017–1023. Bibcode:1985MNRAS.216.1017K. doi:10.1093/mnras/216.4.1017.
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
- ^ Houk, N. (1978). "Michigan atalogue of two dimensional spectral types for the HD stars, Vol. 2". Michigan Spectral Survey. 2. Bibcode:1978mcts.book.....H.
- Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
- ^ Paunzen, E.; Handler, G.; Weiss, W. W.; Nesvacil, N.; Hempel, A.; Romero-Colmenero, E.; Vuthela, F. F.; Reegen, P.; Shobbrook, R. R.; Kilkenny, D. (2002). "On the Period-Luminosity-Colour-Metallicity relation and the pulsational characteristics of λ Bootis type stars". Astronomy and Astrophysics. 392 (2): 515–528. arXiv:astro-ph/0207494. Bibcode:2002A&A...392..515P. doi:10.1051/0004-6361:20020854. S2CID 54666586.
- "AZ Phe". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2 February 2019.
- Weiss, W. W. (1977). "HR 239 and HR 8676: Two delta Scuti-Type Variables". Information Bulletin on Variable Stars. 1364: 1. Bibcode:1977IBVS.1364....1W.
- Makarov, V. V.; Kaplan, G. H. (May 2005), "Statistical Constraints for Astrometric Binaries with Nonlinear Motion", The Astronomical Journal, 129 (5): 2420–2427, Bibcode:2005AJ....129.2420M, doi:10.1086/429590.
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