Misplaced Pages

28 Cancri

Article snapshot taken from[REDACTED] with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
Binary star in the constellation Cancer
28 Cancri

A light curve for CX Cancri, plotted from TESS data
Observation data
Epoch J2000      Equinox J2000
Constellation Cancer
Right ascension 08 28 36.78530
Declination +24° 08′ 41.7179″
Apparent magnitude (V) 6.05
Characteristics
Spectral type F0 Vn
U−B color index +0.13
B−V color index +0.22
Variable type δ Sct
Astrometry
Radial velocity (Rv)+9.0±4.3 km/s
Proper motion (μ) RA: −30.946 mas/yr
Dec.: −39.719 mas/yr
Parallax (π)8.4885 ± 0.1539 mas
Distance384 ± 7 ly
(118 ± 2 pc)
Absolute magnitude (MV)0.41
Details
Mass2.36±0.11 M☉
Radius3.7 R☉
Luminosity44 L☉
Surface gravity (log g)3.61 cgs
Temperature7,516+52
−103 K
Metallicity +0.16 dex
Rotational velocity (v sin i)133 km/s
Age737 Myr
Other designations
28 Cnc, CX Cnc, BD+24°1931, HD 71496, HIP 41574, HR 3329, SAO 80204
Database references
SIMBADdata

28 Cancri is a star system in the zodiac constellation of Cancer. It is a variable star with the designation CX Cancri, and is close to the lower limit of visibility with the naked eye, having a mean apparent visual magnitude of 6.05. The annual parallax shift seen from Earth's orbit is 8.5 mas, which provides a distance estimate of about 384 light years. It is moving away from the Sun with a radial velocity of around +9 km/s.

Based upon proper motion variation, this is an astrometric binary system with high likelihood (99.8%). The visible component has a stellar classification of F0 Vn, indicating it is a F-type main-sequence star with "nebulous" lines due to rapid rotation.

In 1973, John R Percy announced that 28 Cancri might be a variable star. Stephen John Horan et al. confirmed that the star's brightness varies, in 1974. In 1979, it was given its variable star designation. It is a Delta Scuti variable star with a period of 0.0960 days and an amplitude of 0.020 in magnitude. With 2.4 times the mass of the Sun it is spinning with a high projected rotational velocity of 133 km/s. 28 Cancri is radiating roughly 44 times the Sun's luminosity from its photosphere at an effective temperature of around 7,516 K.

References

  1. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. ^ 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. ^ Oja, T. (August 1991), "UBV photometry of stars whose positions are accurately known. VI", Astronomy and Astrophysics Supplement Series, 89 (2): 415–419, Bibcode:1991A&AS...89..415O.
  4. ^ Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  5. Dubath, P.; et al. (2011), "Random forest automated supervised classification of Hipparcos periodic variable stars", Monthly Notices of the Royal Astronomical Society, 414 (3): 2602–2617, arXiv:1101.2406, Bibcode:2011MNRAS.414.2602D, doi:10.1111/j.1365-2966.2011.18575.x, S2CID 118560311.
  6. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  7. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  8. ^ Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789, A120.
  9. Netopil, Martin (4 May 2017). "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system". Monthly Notices of the Royal Astronomical Society. 469 (3): 3042–3055. arXiv:1705.00883. Bibcode:2017MNRAS.469.3042N. doi:10.1093/mnras/stx1077. eISSN 1365-2966. ISSN 0035-8711.
  10. "28 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-09.
  11. Frankowski, A.; et al. (March 2007), "Proper-motion binaries in the Hipparcos catalogue. Comparison with radial velocity data", Astronomy and Astrophysics, 464 (1): 377–392, arXiv:astro-ph/0612449, Bibcode:2007A&A...464..377F, doi:10.1051/0004-6361:20065526, S2CID 14010423.
  12. Percy, John R. (June 1973). "A Search for Delta Scuti Stars". Journal of the Royal Astronomical Society of Canada. 67: 139–141. Bibcode:1973JRASC..67..139P. Retrieved 31 December 2024.
  13. Horan, S. J.; Michael, J. L.; Seeds, M. A. (June 1974). "Possible Beats in Two delta Scuti Stars" (PDF). Information Bulletin on Variable Stars. 896: 1. Bibcode:1974IBVS..896....1H. Retrieved 31 December 2024.
  14. Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (April 1979). "64th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 1581: 1–8. Bibcode:1979IBVS.1581....1K. Retrieved 31 December 2024.
  15. Rodríguez, E.; et al. (June 2000), "A revised catalogue of δ Sct stars", Astronomy and Astrophysics Supplement, 144 (3): 469–474, Bibcode:2000A&AS..144..469R, doi:10.1051/aas:2000221, hdl:10261/226673.
Constellation of Cancer
Stars
Bayer
Flamsteed
Variable
HD
Other
Exoplanets
Star clusters
Nebulae
Galaxies
NGC
Other
Galaxy clusters
Category
Categories:
28 Cancri Add topic