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AR Cephei

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AR Cephei
AR Cephei DSS.png
AR Cephei, as seen during the Digitized Sky Survey
Observation data
Epoch J2000       Equinox J2000
Constellation Cepheus
Right ascension 22h 51m 33.86137s [1]
Declination +85° 02′ 46.9418″ [1]
Apparent magnitude  (V)6.9 - 8.3 [2]
Characteristics
Spectral type M4 III [3]
B−V color index +1.52 [4]
Variable type SRb [2]
Astrometry
Radial velocity (Rv)−15.66±0.23 [1] km/s
Proper motion (μ)RA: 26.580 [1] mas/yr
Dec.: 4.143 [1] mas/yr
Parallax (π)3.2317±0.0967  mas [1]
Distance 1,010 ± 30  ly
(309 ± 9  pc)
Details
Mass 2.8 [5]   M☉
Radius 123 [1]   R☉
Luminosity 2,094 [1]   L☉
Surface gravity (log g)1.49 [5]   cgs
Temperature 2,400 - 3,700[ citation needed ]  K
Metallicity [Fe/H]−0.39 [5]   dex
Other designations
BD+84 516, HD 217158, HIP 112882, SAO 3809 [6]
Database references
SIMBAD data

AR Cephei (AR Cep) is a variable star in the constellation Cepheus. It is classified as a semiregular star [7] [8] with a spectral type of M4III. [3]

Aernout de Sitter discovered the star in 1933. [3] [9] It was given its variable star designation, AR Cephei, in 1939. [9]

A visual band light curve for AR Cephei, plotted from ASAS-SN data ARCepLightCurve.png
A visual band light curve for AR Cephei, plotted from ASAS-SN data

AR Cephei is located approximately 1,010 light-years (309 parsecs) from the Solar System, and has a radial velocity of -16 km/s, meaning that it is moving toward the Sun at ~16 kilometers every second. [1]

See also

References

  1. 1 2 3 4 5 6 7 8 9 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR .
  2. 1 2 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.
  3. 1 2 3 Kucinskas, Arunas (1990). "Változócsillagok. A AR Cephei statisztikai analízise" (PDF). Meteor (in Hungarian). 20: 31–33.
  4. ↑ Oja, T. (1984). "UBV photometry of stars whose positions are accurately known". Astronomy and Astrophysics Supplement Series. 57: 357. Bibcode:1984A&AS...57..357O.
  5. 1 2 3 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv: 2407.06963 . Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
  6. ↑ "V* AR Cep". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2025-03-19.
  7. ↑ Kučinskas, Arūnas (1990). "Statistical Analysis of the Semiregular Variable AR Cephei". The Journal of the American Association of Variable Star Observers. 19 (1): 73–75. Bibcode:1990JAVSO..19...73K.
  8. ↑ "obj-Cep". britastro.org. Retrieved 2024-09-25.
  9. 1 2 Guthnick, P.; Schneller, H. (1939). "Benennung von veränderlichen Sternen". Astronomische Nachrichten. 268 (11–12): 165. Bibcode:1939AN....268..165G. doi:10.1002/asna.19392681102.
  10. ↑ "ASAS-SN Variable Stars Database". ASAS-SN Variable Stars Database. ASAS-SN. Retrieved 20 October 2024.
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