BC Cygni explained

BC Cygni (BC Cyg, HIP 100404, BD + 37 3903) is a red supergiant and pulsating variable star of spectral type M3.5Ia in the constellation Cygnus.

It is considered a member of the stellar Cygnus OB1 association, and within it the open cluster Berkeley 87,[1] which would place at a distance of 1673pc of the Solar System;[2] it is less than a degree north of another variable red supergiant, BI Cygni. According to its Gaia Data Release 3 parallax, it is at about .

BC Cygni was found to have a luminosity of and an efective temperature of 2,858K in the year 1900, and a luminosity of and a temperature of 3,614K in the year 2000. At its brightest and coolest has been calculated to be compared to at the hottest and faintest.[3] It is one of largest stars known, and currently is times larger than the Sun. If it were in the place of the Sun, its photosphere would engulf the entire inner solar system and reach close to the orbit of Jupiter. With a mass of about, it is estimated that the stellar mass loss, as dust, as the atomic and molecular gas could not be evaluators is per year.[4]

The brightness of BC Cyg varies from visual magnitude +9.0 and +10.8 with a period of 720 ± 40 days.[5] Between around the year 1900 and 2000 appears to have increased its average brightness of 0.5 magnitudes.[6]

See also

Notes and References

  1. 2010ApJ...715.1327S . Chandra Detects the Rare Oxygen-type Wolf-Rayet Star WR 142 and OB Stars in Berkeley 87 . Sokal . Kimberly R. . Skinner . Stephen L. . Zhekov . Svetozar A. . Güdel . Manuel . Schmutz . Werner . The Astrophysical Journal . 2010 . 715 . 2 . 1327 . 10.1088/0004-637X/715/2/1327 . 1004.0462 . 119232391 .
  2. 2021A&A...650A.156D . Clustered star formation toward Berkeley 87/ON2. I. Multiwavelength census and the population overlap problem . de la Fuente . Diego . Román-Zúñiga . Carlos G. . Jiménez-Bailón . Elena . Alves . João . Garcia . Miriam . Venus . Sean . Astronomy and Astrophysics . 2021 . 650 . A156 . 10.1051/0004-6361/202040065 . 2103.06062 . 232170603 .
  3. Turner . David G. . Rohanizadegan . Mina . Berdnikov . Leonid N. . Pastukhova . Elena N. . 2006-11-02 . The Long-Term Behavior of the Semiregular M Supergiant Variable BC Cygni . Publications of the Astronomical Society of the Pacific . en . 118 . 849 . 1533 . 10.1086/508905 . 2006PASP..118.1533T . 1538-3873.
  4. Atmospheric dynamics and the mass loss process in red supergiant stars. Astronomy and Astrophysics. 2007. 469. 2. 671. 2007A&A...469..671J. Josselin. E.. Plez. B.. 10.1051/0004-6361:20066353. 0705.0266. 17789027.
  5. 2006MNRAS.372.1721K. Variability in red supergiant stars: Pulsations, long secondary periods and convection noise. Monthly Notices of the Royal Astronomical Society. 372. 4. 1721–1734. Kiss. L. L.. Szabó. Gy. M.. Bedding. T. R.. Tim Bedding. 2006. 10.1111/j.1365-2966.2006.10973.x. free . astro-ph/0608438 . 5203133.
  6. 2006PASP..118.1533T. The Long-Term Behavior of the Semiregular M Supergiant Variable BC Cygni. The Publications of the Astronomical Society of the Pacific. 118. 849. 1533. Turner. David G.. Rohanizadegan. Mina. Berdnikov. Leonid N.. Pastukhova. Elena N.. 2006. 10.1086/508905. free.

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