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38 Cancri

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Star in the constellation Cancer
38 Cancri

A visual band light curve for BT Cancri, plotted from data published by Gupta (1979)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension 08 39 42.65445
Declination +19° 46′ 42.4386″
Apparent magnitude (V) 6.65
Characteristics
Evolutionary stage subgiant
Spectral type F0 IV
B−V color index 0.248±0.010
Variable type δ Sct
Astrometry
Radial velocity (Rv)+32.0±2.0 km/s
Proper motion (μ) RA: −36.879 mas/yr
Dec.: −13.103 mas/yr
Parallax (π)5.3700 ± 0.0705 mas
Distance607 ± 8 ly
(186 ± 2 pc)
Absolute magnitude (MV)0.36
Details
Mass1.786 M☉
Radius1.834 R☉
Luminosity59.31 L☉
Surface gravity (log g)2.92±0.20 cgs
Temperature7300±200 K
Metallicity −0.16±0.10 dex
Rotation0.670 d
Rotational velocity (v sin i)138.5 km/s
Other designations
38 Cnc, BT Cancri, BD+20°2149, HD 73575, HIP 42485, SAO 98006
Database references
SIMBADdata

38 Cancri is a variable star in the zodiac constellation Cancer, located around 607 light years from the Sun. This object has the variable star designation BT Cancri; 38 Cancri is the Flamsteed designation. It is a member of the Praesepe cluster but is a challenge to view with the naked eye, having an apparent visual magnitude of 6.65. The star is moving closer to the Earth with a heliocentric radial velocity of +32 km/s.

This is an evolving subgiant star with a stellar classification of F0 IV. It was found to be a pulsating variable by Michel Breger in 1970 and is classed as a Delta Scuti variable. The star displays a pattern of variation showing up to 22 different frequencies, with three being dominant. The brightness varies by up to 0.07 in magnitude. The star has a magnetic field with a computed longitudinal field strength of −215±149 G. It has 1.8 times the mass of the Sun and 1.8 times the Sun's radius. The star is radiating 59 times the Sun's luminosity from its photosphere at an effective temperature of around 7,300 K.

References

  1. Gupta, S. K. (September 1979). "Light Variation of the Delta Scuti Star 38 CNC". Bulletin of the Astronomical Society of India. 7: 72–77. Bibcode:1979BASI....7...72G. Retrieved 11 November 2021.
  2. ^ 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.
  3. ^ 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.
  4. ^ Gray, R. O.; et al. (April 2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", The Astronomical Journal, 121 (4): 2148–2158, Bibcode:2001AJ....121.2148G, doi:10.1086/319956.
  5. ^ Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
  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. ^ van Saders, Jennifer L.; Pinsonneault, Marc H. (October 2013), "Fast Star, Slow Star; Old Star, Young Star: Subgiant Rotation as a Population and Stellar Physics Diagnostic", The Astrophysical Journal, 776 (2): 20, arXiv:1306.3701, Bibcode:2013ApJ...776...67V, doi:10.1088/0004-637X/776/2/67, S2CID 119097746, 67.
  8. ^ Fossati, L.; et al. (December 2007), "Late stages of the evolution of A-type stars on the main sequence: comparison between observed chemical abundances and diffusion models for 8 Am stars of the Praesepe cluster", Astronomy and Astrophysics, 476 (2): 911–925, arXiv:0710.0579, Bibcode:2007A&A...476..911F, doi:10.1051/0004-6361:20078320, S2CID 16152096.
  9. "38 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-01.
  10. Michel, E.; et al. (February 1999), "Seismology of delta Scuti stars in the Praesepe cluster. I. Ranges of unstable modes as predicted by linear analysis versus observations", Astronomy and Astrophysics, 342: 153–166, Bibcode:1999A&A...342..153M.
  11. Breger, Michel (November 1970), "Metallic-Line a Stars and Pulsation", Astrophysical Journal, 162: 597, Bibcode:1970ApJ...162..597B, doi:10.1086/150691
  12. Breger, M.; et al. (February 2012), "Delta Scuti stars in the Praesepe cluster observed by the MOST satellite", Astronomische Nachrichten, 333 (2): 131, arXiv:1201.0892, Bibcode:2012AN....333..131B, doi:10.1002/asna.201111640, S2CID 118458884.
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