KSw 71

KSw 71

Artist's impression of KSw 71
Observation data
Epoch J2000      Equinox ICRS
Constellation Lyra
Right ascension 19h 14m 17.2632s
Declination +42° 36′ 31.619″
Characteristics
Spectral type K0-2 IV-III
Astrometry
Proper motion (μ) RA: −0.309 mas/yr
Dec.: +6.073 mas/yr
Parallax (π)3.1267±0.0170 mas
Distance1,043 ± 6 ly
(320 ± 2 pc)
Details
Mass0.8257 M☉
Radius10.5 R☉
Surface gravity (log g)4.38 cgs
Temperature4,967 K
Rotation5.22 days
Rotational velocity (v sin i)98.6 – 116 km/s
Other designations
2MASS J19141726+4236315, KIC 7107762
Database references
SIMBADdata
KICdata

KSw 71 is a rapidly-spinning star in the constellation of Lyra. It is thought to have formed after two stars in a close binary system merged; its rotation has deformed it into an oblate spheroid shape. KSw 71 was discovered, alongside other pumpkin-shaped stars by NASA's Kepler and Swift missions and produces X-rays at more than 100 times the peak levels ever seen from the Sun.

18 "pumpkin stars" have been discovered, including this one.

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  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 4 Howell, Steve B.; Mason, Elena; Boyd, Patricia; Smith, Krista Lynne; Gelino, Dawn M. (2016). "Rapidly Rotating, X-Ray Bright Stars in the Kepler Field". The Astrophysical Journal. 831 (1): 27. arXiv:1608.07828v1. Bibcode:2016ApJ...831...27H. doi:10.3847/0004-637X/831/1/27. S2CID 42256068.
  4. 1 2 3 McQuillan, A.; Mazeh, T.; Aigrain, S. (2014). "Rotation Periods of 34,030 Keplermain-Sequence Stars: The Full Autocorrelation Sample". The Astrophysical Journal Supplement Series. 211 (2): 24. arXiv:1402.5694v2. Bibcode:2014ApJS..211...24M. doi:10.1088/0067-0049/211/2/24. S2CID 119113480.
  5. ↑ Reddy, Francis (27 October 2016). "NASA Missions Harvest a Passel of 'Pumpkin' Stars". NASA. Retrieved 30 October 2016.
  6. ↑ Viz, NASA (8 October 2018). "NASA Viz: Pumpkin Stars". svs.gsfc.nasa.gov. Retrieved 17 January 2021.