Omicron Persei

ο Persei
Location of ο Persei (circled red)
Observation data
Epoch J2000      Equinox ICRS
Constellation Perseus
A
Right ascension 03h 44m 19.13377s
Declination +32° 17′ 17.6874″
Apparent magnitude (V) 3.83
B
Right ascension 03h 44m 19.17122s
Declination +32° 17′ 18.5103″
Apparent magnitude (V) 6.68
Characteristics
A
Spectral type B1III / B2V
U−B color index −0.75
B−V color index +0.05
Variable type ellipsoidal
Astrometry
Radial velocity (Rv)+12.20 km/s
Absolute magnitude (MV)−4.4
A
Proper motion (μ) RA: +6.091 mas/yr
Dec.: −9.732 mas/yr
Parallax (π)3.0224±0.3827 mas
Distanceapprox. 1,100 ly
(approx. 330 pc)
Orbit
PrimaryAa
SecondaryAb
Period (P)4.4191447 days
Semi-major axis (a)33 R☉
Eccentricity (e)0.0
Inclination (i)39±15°
Semi-amplitude (K1)
(primary)		111.8 km/s
Semi-amplitude (K2)
(secondary)		155.0 km/s
Details
Aa
Mass14 M☉
Radius9.6 R☉
Surface gravity (log g)3.4 cgs
Temperature22,700 K
Rotational velocity (v sin i)70±5 km/s
Ab
Mass10 M☉
Radius8.9 R☉
Surface gravity (log g)4.0 cgs
Temperature21,000 K
Rotational velocity (v sin i)65±15 km/s
Age15 Myr
Other designations
Atik, 38 Persei, ADS 2726 AB, BD+31°642, CCDM J03443+3217AB, GC 4461, GSC 02359-01258, HIP 17448, HR 1131, HD 23180, SAO 56673, WDS J03443+3217AB
Database references
SIMBADdata

Omicron Persei (ο Persei, abbreviated Omicron Per, ο Per) is a triple star system in the constellation of Perseus. From parallax measurements taken during the Hipparcos mission it is approximately 1,100 light-years (330 parsecs) from the Sun.

The system consists of a spectroscopic binary pair designated Omicron Persei A and a third companion Omicron Persei B. A's two components are themselves designated Omicron Persei Aa (officially named Atik /ˈeɪtɪk/, the traditional name of the system) and Ab.

It is optically located close to IC 348, also known as the O Persei Cluster.

Etymology

ο Persei in optical light

ο Persei (Latinised to Omicron Persei) is the system's Bayer designation. The designations of the two constituents as Omicron Persei A and B, and those of A's components - Omicron Persei Aa and Ab - derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).

It bore the traditional name Atik (also Ati, Al Atik), Arabic for "the shoulder". Some sources attribute the name Atik to the nearby, brighter star Zeta Persei. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems. It approved the name Atik for the component Omicron Persei A on 12 September 2016 and it is now so included in the List of IAU-approved Star Names.

In Chinese, 卷舌 (Juǎn Shé), meaning Rolled Tongue, refers to an asterism consisting of Omicron Persei, Nu Persei, Epsilon Persei, Xi Persei, Zeta Persei and 40 Persei. Consequently, the Chinese name for Omicron Persei itself is 卷舌五 (Juǎn Shé wu), "the Fifth Star of Rolled Tongue".

Properties

A light curve for Omicron Persei A, plotted from TESS data

Omicron Persei A is a spectroscopic binary consisting of a spectral type B1 giant and a type B2 dwarf orbiting each other every 4.4 days. The orbit is near-circular although its inclination is not precisely known. The two stars are separated by approximately 33 R☉, the exact value depending on the inclination. The primary is approximately one magnitude brighter than the secondary at visual wavelengths. The binary pair forms a rotating ellipsoidal variable star, which varies in brightness from visual magnitude 3.79 to 3.88 during the orbital period.

Omicron Persei lies just north of the open cluster IC 348, but is not catalogued as a member. Both IC 348 and Omicron Persei belong to the Perseus OB2 association.

Culture

References

  1. 1 2 3 4 5 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. 1 2 3 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. 1 2 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  4. ↑ Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (2002). "The Tycho double star catalogue". Astronomy and Astrophysics. 384: 180–189. Bibcode:2002A&A...384..180F. doi:10.1051/0004-6361:20011822.
  5. 1 2 3 4 5 6 7 8 9 Stickland, D. J.; Lloyd, C. (1998). "Spectroscopic binary orbits from ultraviolet radial velocities. Paper 28: Omicron Persei". The Observatory. 118: 138. Bibcode:1998Obs...118..138S.
  6. ↑ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  7. ↑ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID 119387088.
  8. 1 2 3 4 5 6 Lyubimkov, L. S.; Rachkovskaya, T. M.; Rostopchin, S. I.; Tarasov, A. E. (1997). "The binary system o per: Orbital elements, component parameters, and helium abundance". Astronomy Reports. 41 (5): 630. Bibcode:1997ARep...41..630L.
  9. ↑ "Displaying next number in catalog HIP => 17448". Multiple Star Catalog. Retrieved 2018-02-19.
  10. ↑ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
  11. 1 2 "Naming Stars". IAU.org. Archived from the original on 10 March 2025. Retrieved 16 December 2017.
  12. ↑ Hessman, F. V.; Dhillon, V. S.; Winget, D. E.; Schreiber, M. R.; Horne, K.; Marsh, T. R.; Guenther, E.; Schwope, A.; Heber, U. (2010). "On the naming convention used for multiple star systems and extrasolar planets". arXiv:1012.0707 [astro-ph.SR].
  13. ↑ Mullaney, James; Tirion, Wil (2009). The Cambridge Double Star Atlas, Chart 7. University Press, Cambridge. ISBN 978-0-521-49343-7.
  14. ↑ Your Sky Object Catalogue: Named Stars
  15. ↑ IAU Working Group on Star Names (WGSN), International Astronomical Union, archived from the original on 10 June 2016, retrieved 22 May 2016.
  16. ↑ "WG Triennial Report (2015-2018) - Star Names" (PDF). p. 5. Archived from the original (PDF) on 2019-08-23. Retrieved 2018-07-14.
  17. ↑ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  18. ↑ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2008-10-25 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  19. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  20. ↑ "omi Per". The International Variable Star Index. AAVSO. Retrieved 18 December 2022.
  21. ↑ Stelzer, B.; Preibisch, T.; Alexander, F.; Mucciarelli, P.; Flaccomio, E.; Micela, G.; Sciortino, S. (2012). "X-ray view of IC 348 in the light of an updated cluster census". Astronomy and Astrophysics. 537: A135. arXiv:1111.4420. Bibcode:2012A&A...537A.135S. doi:10.1051/0004-6361/201118118.
  22. ↑ "Omicron Persei 8 meaning explored as hilarious Futurama memes spread". The Focus. 30 November 2021. Archived from the original on 9 October 2022. Retrieved 9 October 2022.
  23. ↑ "How Futurama is related to the new Omicron COVID variant". MARCA. 28 November 2021. Retrieved 9 October 2022.