DX Cancri

DX Cancri is the variable star identifier for a small star in the northern zodiac constellation of Cancer the crab. With an apparent visual magnitude of 14.81,[2] it is much too faint to be seen with the naked eye. Visually viewing this star requires a telescope with a minimum aperture of 16 in (41 cm).[13] Based upon parallax measurements, DX Cancri is located at a distance of 11.8 light-years (3.6 parsecs) from Earth. This makes it the 18th closest star (or star system) to the Sun.

DX Cancri
Observation data
Epoch J2000      Equinox J2000
Constellation Cancer
Right ascension  08h 29m 49.345s[1]
Declination +26° 46′ 33.74″[1]
Apparent magnitude (V) 14.81[2]
Characteristics
Spectral type M6.5V[3]
Apparent magnitude (J) 8.2[2]
U−B color index +2.11[4]
B−V color index +2.08[4]
Variable type Flare star[2]
Astrometry
Radial velocity (Rv)+9.0[5] km/s
Proper motion (μ) RA: –1140[1] mas/yr
Dec.: –602[1] mas/yr
Parallax (π)275.80 ± 3.00[6] mas
Distance11.8 ± 0.1 ly
(3.63 ± 0.04 pc)
Absolute magnitude (MV)16.98[7]
Details
Mass0.09[7] M☉
Radius0.11[8] R☉
Luminosity0.00065[9] L☉
Temperature2,840[10] K
Rotation0.46 days[8]
Rotational velocity (v sin i)11.0[11] km/s
Age200[12] Myr
Other designations
G 051-015, GCTP 2016.01, GJ 1111, LHS 248.[2]
Database references
SIMBADdata

This star has a stellar classification of M6.5V,[3] identifying it as a type of main sequence star known as a red dwarf. It has about 9%[7] of the mass of the Sun and 11%[8] of the Sun's radius. The outer envelope of the star has an effective temperature of 2,840 K,[10] giving it the cool red-orange glow of an M-type star. This is a flare star that has random, intermittent changes in brightness by up to a fivefold increase. This star has been examined for excess emission of infrared radiation caused by cold circumstellar dust, but none was found.[12] It is a proposed member of the Castor Moving Group of stars that share a common trajectory through space. This group has an estimated age of 200 million years.[14]

See also
  • List of nearest stars

References
  1. Zacharias, N.; et al. (2003). The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2). CDS/ADC Collection of Electronic Catalogues, 1289, 0 (2003). Retrieved 2010-06-29.
  2. "V* DX Cnc -- Flare Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-06-29.
  3. Luhman, K. L.; et al. (April 2007). "Ophiuchus 1622-2405: Not a Planetary-Mass Binary". The Astrophysical Journal. 659 (2): 1629–1636. arXiv:astro-ph/0701242. Bibcode:2007ApJ...659.1629L. doi:10.1086/512539.
  4. Weistrop, D. (August 1981). "The nature of the Giclas +4 stars". Astronomical Journal. 86: 1220–1227. Bibcode:1981AJ.....86.1220W. doi:10.1086/113001.
  5. Montes, D.; et al. (November 2001). "Late-type members of young stellar kinematic groups - I. Single stars" (PDF). Monthly Notices of the Royal Astronomical Society. 328 (1): 45–63. arXiv:astro-ph/0106537. Bibcode:2001MNRAS.328...45M. doi:10.1046/j.1365-8711.2001.04781.x.
  6. van Altena, W. F.; Lee, J. T.; Hoffleit, E. D. (1995). The general catalogue of trigonometric [stellar] parallaxes (4th ed.). New Haven, CT: Yale University Observatory. Retrieved 2010-06-29.
  7. "The One Hundred Nearest Star Systems". RECONS. Georgia State University. January 1, 2009. Retrieved 2010-06-29.
  8. Morin, J.; et al. (October 2010), "Large-scale magnetic topologies of late M dwarfs", Monthly Notices of the Royal Astronomical Society, 407 (4): 2269–2286, arXiv:1005.5552, Bibcode:2010MNRAS.407.2269M, doi:10.1111/j.1365-2966.2010.17101.x
  9. Vidotto, A. A.; et al. (July 2013). "Effects of M dwarf magnetic fields on potentially habitable planets". Astronomy & Astrophysics. arXiv:1306.4789. Bibcode:2013A&A...557A..67V. doi:10.1051/0004-6361/201321504.
  10. Reiners, A.; Basri, G. (February 2007). "The First Direct Measurements of Surface Magnetic Fields on Very Low Mass Stars". The Astrophysical Journal. 656 (2): 1121–1135. arXiv:astro-ph/0610365. Bibcode:2007ApJ...656.1121R. doi:10.1086/510304.
  11. Jenkins, J. S.; et al. (October 2009). "Rotational Velocities for M Dwarfs". The Astrophysical Journal. 704 (2): 975–988. arXiv:0908.4092. Bibcode:2009ApJ...704..975J. doi:10.1088/0004-637X/704/2/975.
  12. Lestrade, J.-F.; et al. (November 2009), "Search for cold debris disks around M-dwarfs. II", Astronomy and Astrophysics, 506 (3): 1455–1467, arXiv:0907.4782, Bibcode:2009A&A...506.1455L, doi:10.1051/0004-6361/200912306
  13. Sherrod, P. Clay; Koed, Thomas L. (2003), A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations, Astronomy Series, Courier Dover Publications, p. 9, ISBN 0486428206
  14. Lestrade, J.-F.; et al. (December 2006), "Search for cold debris disks around M-dwarfs", Astronomy and Astrophysics, 460 (3): 733–741, arXiv:astro-ph/0609574, Bibcode:2006A&A...460..733L, doi:10.1051/0004-6361:20065873

Further reading
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.