Astronomy:V381 Cephei

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Short description: Triple star system in the constellation Cepheus
V381 Cephei
Location of V381 Cephei (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Cepheus
Right ascension  21h 19m 15.682s[1]
Declination +58° 37′ 24.550″[1]
Apparent magnitude (V) 5.51 - 5.71[2]
Characteristics
Spectral type M1epIb + B[3]
U−B color index 0.00[4]
B−V color index +1.34[4]
Variable type Lc[2]
Astrometry
Radial velocity (Rv)−14.10[5] km/s
Proper motion (μ) RA: −1.435[6] mas/yr
Dec.: −5.427[6] mas/yr
Parallax (π)1.59 ± 0.23[6] mas
Distanceapprox. 2,100 ly
(approx. 630 pc)
Absolute magnitude (MV)−5.2[7]
Details
Aa
Mass7.2[8] - 16[9] M☉
Radius977[10] R☉
Luminosity178,000[10] L☉
Temperature3,745±170[1][10] K
Ab
Mass13[9] M☉
B
Mass7.1[11] M☉
Radius3.4[12] R☉
Luminosity1,487[12] L☉
Surface gravity (log g)4.18[12] cgs
Temperature19,965[12] K
Metallicity [Fe/H]−0.30[11] dex
Rotational velocity (v sin i)42.8[13] km/s
Age49.1[8] Myr
Other designations
V381 Cephei, HR 8164, HIP 105259, BD+58°2249, ADS 14864, 2MASS J21191567+5837246, WDS J21193+5837
A: HD 203338
B: HD 203339
Database references
A
B

V381 Cephei (HR 8164) is a triple star system in the northern constellation of Cepheus. Its apparent magnitude is slightly variable between 5.5 and 5.7. It is faintly visible to the naked eye under good observing conditions.

The star was discovered to be a variable star in 1991, by Elaine M. Halbedel.[14] It was given its variable star designation, V381 Cephei, in 1995.[15]

System

V381 Cephei is a visual double star with components A and B separated by 4.6". The primary is HD 203338 and the secondary is the magnitude 9.2 HD 203339.[9]

HD 203338 is itself a spectroscopic binary with components Aa and Ab orbiting every 280 years.[9] It forms a VV Cephei-type binary system with a hot companion which is accreting mass from the primary. The long period means that it exhibits fewer peculiarities than other VV Cephei binaries.[16]

Properties

A visual band light curve for V381 Cephei, adapted from Halbedel (1991)[17]

Component Aa is a red supergiant and its close companion is a B2 main sequence star. The supergiant is a pulsating variable with a small amplitude and poorly defined period. It is generally given spectral class qualifiers indicating peculiarities and emission, which may be associated with the disc around the hot secondary.[16]

Component B, HD 203339, is a B3 main sequence star with a mass around 11 M☉.[9]

References

  1. ↑ 1.0 1.1 1.2 Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal 158 (1): 20. doi:10.3847/1538-3881/ab1cbd. Bibcode: 2019AJ....158...20M. 
  2. ↑ 2.0 2.1 Samus, N. N. 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. 
  3. ↑ Josselin, E.; Plez, B. (2007). "Atmospheric dynamics and the mass loss process in red supergiant stars". Astronomy and Astrophysics 469 (2): 671. doi:10.1051/0004-6361:20066353. Bibcode: 2007A&A...469..671J. 
  4. ↑ 4.0 4.1 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. 
  5. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  6. ↑ 6.0 6.1 6.2 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  7. ↑ Stothers, R.; Leung, K. C. (1971). "Luminosities, masses and periodicities of massive red supergiants". Astronomy and Astrophysics 10: 290. Bibcode: 1971A&A....10..290S. 
  8. ↑ 8.0 8.1 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society 410 (1): 190–200. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode: 2011MNRAS.410..190T. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 Tokovinin, A. A. (1997). "MSC - a catalogue of physical multiple stars". Astronomy and Astrophysics Supplement Series 124: 75–84. doi:10.1051/aas:1997181. Bibcode: 1997A&AS..124...75T. 
  10. ↑ 10.0 10.1 10.2 Healy, Sarah; Horiuchu, Shunsaku; Colomer Moller, Marta; Milisavljevic, Dan; Tseng, Jeff; Bergin, Faith; Weil, Kathryn; Tanaka, Masaomi (2024). "Red supergiant candidates for multimessenger monitoring of the next Galactic supernova". Monthly Notices of the Royal Astronomical Society 529 (4): 3630–3650. doi:10.1093/mnras/stae738. Bibcode: 2024MNRAS.529.3630H. 
  11. ↑ 11.0 11.1 Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardevol, J.; Casamiquela, L.; Figueras, F.; Jimenez-Arranz, O. et al. (2022). "VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)". Vizier Online Data Catalog. Bibcode: 2022yCat.1354....0A. 
  12. ↑ 12.0 12.1 12.2 12.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  13. ↑ Glebocki, R.; Gnacinski, P. (2005). "VizieR Online Data Catalog: Catalog of Stellar Rotational Velocities (Glebocki+ 2005)". VizieR On-line Data Catalog: III/244. Originally Published in: 2005csss...13..571G; 2005yCat.3244....0G 3244. Bibcode: 2005yCat.3244....0G. 
  14. ↑ Halbedel, Elaine M. (March 1991). "Photometric Variability for the VV Cephei-Like Star HR 8164". Publications of the Astronomical Society of the Pacific 103: 310-312. doi:10.1086/132820. Bibcode: 1991PASP..103..310H. https://articles.adsabs.harvard.edu/pdf/1991PASP..103..310H. Retrieved 22 January 2025. 
  15. ↑ Kazarovets, E. V.; Samus, N. N. (January 1995). "The 72nd Name-List of Variable Stars". Information Bulletin on Variable Stars 4140: 1-28. Bibcode: 1995IBVS.4140....1K. https://ibvs.konkoly.hu/pub/ibvs/4101/4140.pdf. Retrieved 22 January 2025. 
  16. ↑ 16.0 16.1 Halbedel, Elaine M. (1991). "Photometric variability for the VV Cephei-like star HR 8164". Astronomical Society of the Pacific 103: 310. doi:10.1086/132820. Bibcode: 1991PASP..103..310H. 
  17. ↑ Halbedel, Elaine M. (March 1991). "Photometric Variability for the VV Cephei-Like Star HR 8164". Publications of the Astronomical Society of the Pacific 103: 310. doi:10.1086/132820. Bibcode: 1991PASP..103..310H. 



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