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AC Andromedae (AC And) is a variable star in the constellation Andromeda. Its maximum apparent visual magnitude is 10.77, but can be seen fainter down to a magnitude of 11.9.[3]

AC Andromedae

A visual band light curve of AC Andromedae, from data presented by Peña et al.[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 18m 02.34635s[2]
Declination +48° 46′ 58.33955″[2]
Apparent magnitude (V) 10.7 – 11.9 variable [3]
Characteristics
Spectral type F5[4]
Apparent magnitude (B) 11.48[5]
Apparent magnitude (V) 10.90[5]
Apparent magnitude (G) 10.9002[2]
Apparent magnitude (J) 9.646[6]
Apparent magnitude (H) 9.483[6]
Apparent magnitude (K) 9.345[6]
B−V color index 0.5389[5]
Variable type Peculiar[3]
Astrometry
Radial velocity (Rv)−50.0±2.8[7] km/s
Proper motion (μ) RA: −2.342±0.049 [2] mas/yr
Dec.: −2.285±0.048[2] mas/yr
Parallax (π)0.5315 ± 0.0315 mas[2]
Distance6,100 ± 400 ly
(1,900 ± 100 pc)
Other designations
2MASS J23180234+4846582, BD+47 4104, HIP 115046, TYC 3644-2114-1
Database references
SIMBADdata

The nature of AC Andromedae is still not determined. Its light curve shows clearly three radial pulsation modes, the fundamental one with a period of 0.71 days, and the first two overtones of 0.525 and 0.421 days, respectively. It is then unclear if it belongs to the class of RR Lyrae variables or to the one of Delta Scuti variables.[8][9] Another study points at AC And as an intermediate object between classical Cepheids and Delta Scuti variables.[4] The physical parameters of the star itself would be different depending on which class it belongs to.

By late 2018, the AC Andromedae was classified as rare "triple-mode" subtype of the dwarf cepheid (high-amplitude Delta Scuti variable).[10][11]


References


  1. Peña, J. H.; Peniche, R.; Hobart, M. A.; de la Cruz, C.; Gallegos, A. A. (October 2005). "UVBY-& PHOTOMETRY OF THE RR LYRAE STAR AC AND". Revista Mexicana de Astronomía y Astrofísica. 41 (2): 461–470. Retrieved 6 October 2021.
  2. 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.
  3. AC And, database entry, Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.), N. N. Samus, O. V. Durlevich, et al., CDS ID II/250 Accessed on line 2018-10-17.
  4. Fernie, J. D. (November 1994), "AC Andromedae: the missing link between δ Scuti stars and classical Cepheids?", Monthly Notices of the Royal Astronomical Society, 271: L19–L20, Bibcode:1994MNRAS.271L..19F, doi:10.1093/mnras/271.1.L19.
  5. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy & Astrophysics, 355: L27–L30, Bibcode:2000A&A...355L..27H.
  6. Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
  7. 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.
  8. Fitch, W. S.; Szeidl, B. (February 1976), "The three radial modes and evolutionary state of AC Andromedae.", Astrophysical Journal, 203: 616–624, Bibcode:1976ApJ...203..616F, doi:10.1086/154120.
  9. Petersen, J. O. (May 1978), "An interpretation of the unique triple mode variable AC Andromedae as an RR Lyrae type star oscillating in the first three radial over-tones.", Astronomy and Astrophysics, 65: 616–624, Bibcode:1978A&A....65..451P.
  10. Jurcsik, Johanna; Hajdu, Gergely; Catelan, Márcio (2018), New Galactic multi-mode Cepheids from the ASAS-SN Survey, arXiv:1812.01575
  11. Yang, Tao-Zhi; Sun, Xiao-Ya; Zuo, Zhao-Yu; Liu, Hai-Wen (2020), "KIC 10975348: A Double-mode or Triple-mode High-amplitude δ Scuti Star?", The Astronomical Journal, 161: 27, arXiv:2011.09091, doi:10.3847/1538-3881/abcb8b, S2CID 227013065

На других языках

- [en] AC Andromedae

[ru] AC Андромеды

AC Андромеды (лат. AC Andromedae) — одиночная переменная звезда в созвездии Андромеды на расстоянии приблизительно 6137 световых лет (около 1881 парсека) от Солнца. Видимая звёздная величина звезды — от +11,9m до +10,7m[5].


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