V381 Cephei

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V381 Cephei
Cepheus constellation map.svg
Red circle.svg
Location of V381 Cephei (circled)
Observation data
Epoch J2000.0        Equinox J2000.0
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  mas [6]
Distance approx. 2,100  ly
(approx. 630  pc)
Absolute magnitude  (MV)−5.2 [7]
Details
Aa
Mass 7.2 [8] - 16 [9]   M☉
Radius 977 [10]   R☉
Luminosity 178,000 [10]   L☉
Temperature 3,745±170 [1] [10]   K
Ab
Mass 13 [9]   M☉
B
Mass 7.1 [11]   M☉
Radius 3.4 [12]   R☉
Luminosity 1,487 [12]   L☉
Surface gravity (log g)4.18 [12]   cgs
Temperature 19,965 [12]   K
Metallicity [Fe/H]−0.30 [11]   dex
Rotational velocity (v sin i)42.8 [13]  km/s
Age 49.1 [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.

Contents

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) V381CepLightCurve.png
A visual band light curve for V381 Cephei, adapted from Halbedel (1991)

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 2 3 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. arXiv: 1905.03744 . Bibcode:2019AJ....158...20M. doi: 10.3847/1538-3881/ab1cbd . S2CID   148571616.
  2. 1 2 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.
  3. ↑ Josselin, E.; Plez, B. (2007). "Atmospheric dynamics and the mass loss process in red supergiant stars". Astronomy and Astrophysics. 469 (2): 671. arXiv: 0705.0266 . Bibcode:2007A&A...469..671J. doi:10.1051/0004-6361:20066353. S2CID   17789027.
  4. 1 2 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. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID   119231169.
  6. 1 2 3 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.
  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. 1 2 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. arXiv: 1007.4883 . Bibcode:2011MNRAS.410..190T. doi: 10.1111/j.1365-2966.2010.17434.x . S2CID   118629873.
  9. 1 2 3 4 5 Tokovinin, A. A. (1997). "MSC - a catalogue of physical multiple stars". Astronomy and Astrophysics Supplement Series. 124: 75–84. Bibcode:1997A&AS..124...75T. doi: 10.1051/aas:1997181 .
  10. 1 2 3 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. arXiv: 2307.08785 . Bibcode:2024MNRAS.529.3630H. doi: 10.1093/mnras/stae738 .
  11. 1 2 Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardevol, J.; Casamiquela, L.; Figueras, F.; Jimenez-Arranz, O.; Jordi, C.; Monguio, M.; Romero-Gomez, M.; Altamirano, D.; Antoja, T.; Assaad, R.; Cantat-Gaudin, T.; Castro-Ginard, A.; Enke, H.; Girardi, L.; Guiglion, G.; Khan, S.; Luri, X.; Miglio, A.; Minchev, I.; Ramos, P.; Santiago, B. X.; Steinmetz, M. (2022). "VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)". Vizier Online Data Catalog. Bibcode:2022yCat.1354....0A.
  12. 1 2 3 4 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.
  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. Bibcode:1991PASP..103..310H. doi:10.1086/132820 . Retrieved 22 January 2025.
  15. ↑ Kazarovets, E. V.; Samus, N. N. (January 1995). "The 72nd Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 4140: 1–28. Bibcode:1995IBVS.4140....1K . Retrieved 22 January 2025.
  16. 1 2 Halbedel, Elaine M. (1991). "Photometric variability for the VV Cephei-like star HR 8164". Astronomical Society of the Pacific. 103: 310. Bibcode:1991PASP..103..310H. doi: 10.1086/132820 . S2CID   120879494.
  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. Bibcode:1991PASP..103..310H. doi: 10.1086/132820 . S2CID   120879494.
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