V380 Cygni

A light curve for V380 Cygni, adapted from Tkachenko et al. (2012).[1] The blue points in the upper panel show Kepler data. The red line shows a model for the light curve which assumes the two stars have no intrinsic variability. The bottom panel shows the Kepler data with the model subtracted, revealing the intrinsic variability.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 19h 50m 37.32678s[2]
Declination +40° 35′ 59.1351″[2]
Apparent magnitude (V) 5.61 - 5.78[3]
Characteristics
Spectral type B1.5 II-III(primary) + B2 V(secondary)[4]
Variable type Algol / detached[3]
Astrometry
Proper motion (μ) RA: −3.125±0.055[2] mas/yr
Dec.: −8.067±0.053[2] mas/yr
Parallax (π)0.8673 ± 0.0510 mas[2]
Distance3,800 ± 200 ly
(1,150 ± 70 pc)
Orbit[5]
Period (P)12.425719±0.000014 d
Eccentricity (e)0.234±0.006
Inclination (i)82.4±0.02°
Semi-amplitude (K1)
(primary)		94.5±1.5 km/s
Semi-amplitude (K2)
(secondary)		151.1±3.0 km/s
Details
Primary
Mass11.80±0.13[1] M☉
Radius16.00±0.13[1] R☉
Luminosity54,200±2,700[1] L☉
Surface gravity (log g)3.102±0.007 cgs
Temperature21,500[1] K
Secondary
Mass7.194±0.055[1] M☉
Radius3.904±0.067[1] R☉
Luminosity3,000±320[1] L☉
Surface gravity (log g)4.112±0.015 cgs
Temperature22,000[1] K
Other designations
HD 187879, BD+40 3902, HIP 97634, HR 7567, SAO 48892,[6] Boss 5070
Database references
SIMBADdata

V380 Cygni is an eclipsing binary star in the constellation Cygnus, located about 3,800 light years away from the Earth. Its apparent magnitude ranges from 5.61 to 5.78, making it faintly visible to the naked eye of an observer located far from city lights.[3] Because it is an important test object for models of massive stars, it has been the subject of many scientific studies.[1]

V380 Cygni was discovered to be a spectroscopic binary by Walter Sydney Adams, based on three spectra taken on separate nights in 1912 at the Mount Wilson Observatory.[7][8] The binary's orbit was first calculated from spectra obtained in 1920 at the DDO; the period was found to be 12.427 days.[8] Because the physical separation of spectroscopic binaries is often relatively small, they are good candidates to be eclipsing binaries. For that reason, in 1923 Joel Stebbins included V380 Cygni (then called Boss 5070) in an early photo-electric photometry study. A secondary eclipse was detected in June 1923 on the first night the star was observed.[9][10]

V380 Cygni was observed several times at high cadence, for many days, by the Kepler spacecraft. In addition to the brightness variations caused by eclipses, the Kepler data showed that the primary star has significant intrinsic variability which is most apt to be caused by gravity-mode oscillations.[1]

References

  1. 1 2 3 4 5 6 7 8 9 10 11 Tkachenko, A.; Aerts, C.; Pavlovski, K.; Southworth, J.; Degroote, P.; Debosscher, J.; Still, M.; Bryson, S.; Molenberghs, G.; Bloemen, S.; de Vries, B. L.; Hrudkova, M.; Lombaert, R.; Neyskens, P.; Pápics, P. I.; Raskin, G.; Van Winckel, H.; Morris, R. L.; Sanderfer, D. T.; Seader, S. E. (July 2012). "Detection of gravity modes in the massive binary V380 Cyg from Kepler space-based photometry and high-resolution spectroscopy". Monthly Notices of the Royal Astronomical Society: Letters. 424 (1): L21-L25. arXiv:1205.0554. Bibcode:2012MNRAS.424L..21T. doi:10.1111/j.1745-3933.2012.01277.x. S2CID 54027022. Retrieved 14 January 2023.
  2. 1 2 3 4 5 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.
  3. 1 2 3 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. S2CID 125853869.
  4. ↑ Hill, G.; Batten, A. H. (December 1984). "Studies of early-type variable stars. III. The orbit and physical dimensions for V380 Cygni". Astronomy and Astrophysics. 141: 39–48. Bibcode:1984A&A...141...39H. Retrieved 14 January 2023.
  5. ↑ Guinan, Edward F.; Ribas, Ignasi; Fitzpatrick, Edward L.; Giménez, Ávaro; Jordi, Carme; McCook, George P.; Popper, Daniel M. (November 2000). "Eclipsing Binaries as Astrophysical Laboratories: Internal Structure, Core Convection, and Evolution of the B-Star Components of V380 Cygni". The Astrophysical Journal. 544 (1): 409–422. arXiv:astro-ph/0005029. Bibcode:2000ApJ...544..409G. doi:10.1086/317211. S2CID 13454782. Retrieved 14 January 2023.
  6. ↑ "V380 Cyg -- Eclipsing Binary". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-01-12.
  7. ↑ Adams, W. S. (December 1914). "Ten Spectroscopic Binaries". Publications of the Astronomical Society of the Pacific. 26 (156): 261. Bibcode:1914PASP...26..261A. doi:10.1086/122362. S2CID 122672368. Retrieved 13 January 2023.
  8. 1 2 Harper, W. E. (January 1920). "The orbit of the spectroscopic binary Boss 5070". Publications of the Dominion Astrophysical Observatory Victoria. 1: 257–261. Bibcode:1920PDAO....1..257H. Retrieved 13 January 2023.
  9. ↑ Stebbins, Joel (January 1928). "Photo-Electric Photometry of Stars. Chapter VIII. Discovery of Eclipsing Stars". Publications of the Washburn Observatory. 15: 55–58. Bibcode:1928PWasO..15...55S. Retrieved 13 January 2023.
  10. ↑ Kron, Gerald E. (October 1935). "Photometric Elements of Boss 5070". Astrophysical Journal. 82: 225. Bibcode:1935ApJ....82..225K. doi:10.1086/143671. Retrieved 13 January 2023.
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