Astronomy:DX Cancri

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Short description: Red dwarf star in the constellation Cancer

Coordinates: Sky map 08h 29m 49.345s, +26° 46′ 33.74″

DX Cancri
DX Cancri is located in the constellation Cancer.
DX Cancri is located in the constellation Cancer.
DX
Location of DX Cancri in the constellation Cancer

Observation data
Equinox J2000.0]] (ICRS)
Constellation Cancer
Right ascension  08h 29m 49.35279s[1]
Declination +26° 46′ 33.6241″[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: −1,113.694[1] mas/yr
Dec.: −612.191[1] mas/yr
Parallax (π)279.2496 ± 0.0637[1] mas
Distance11.680 ± 0.003 ly
(3.5810 ± 0.0008 pc)
Absolute magnitude (MV)16.98[6]
Details
Mass0.106±0.009[7] M☉
Radius0.1235±0.0006[7] R☉
Luminosity0.00073±0.000007[7] L☉
Surface gravity (log g)~5[7] cgs
Temperature2,840[8] K
Rotation0.46 days[9]
Rotational velocity (v sin i)11.0[10] km/s
Age200[11] Myr
Other designations
G 051-015, GCTP 2016.01, GJ 1111, LHS 248[2]
Database references
SIMBADdata
285px
An ultraviolet band light curve for a flare on DX Cancri, adapted from Pettersen (1981)[12]

DX Cancri is a red dwarf star in the northern zodiac constellation of Cancer. It is the 18th closest star (or star system) to the Sun, at a distance of 11.680 light-years (3.581 parsecs) as determined by its parallax. It is also the nearest star in Cancer.[13] Despite this, the star has less than 1% of the Sun's luminosity[7] and, with an apparent visual magnitude of 14.81,[2] is far 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).[14]

In 1981, Bjørn Ragnvald Pettersen discovered that the star, then called G 51-15, is a variable star.[15] It was given its variable star designation, DX Cancri, in 1985.[16] It is a flare star that has unpredictable, intermittent increases in brightness by up to a factor of five.

The star has a stellar classification of M6.5V,[3] identifying it as a type of main sequence star known as a red dwarf. Such stars are characterized by their high abundance in the universe, low mass, radius, faint brightness and reddish color.[17] It has about 10% of the mass of the Sun, and 12% of the Sun's radius.[7] The outer envelope of the star has an effective temperature of 2,840 K.[8]

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.[18]

References

  1. ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 "V* DX Cnc -- Flare Star". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=DX+Cancri. 
  3. ↑ 3.0 3.1 Luhman, Kevin L.; Allers, Katelyn N.; Jaffe, Daniel T.; Cushing, Michael C.; Williams, Kurtis A.; Slesnick, Catherine L.; Vacca, William D. (April 2007), "Ophiuchus 1622-2405: Not a Planetary-Mass Binary", The Astrophysical Journal 659 (2): 1629–1636, doi:10.1086/512539, Bibcode: 2007ApJ...659.1629L 
  4. ↑ 4.0 4.1 Weistrop, D. (August 1981). "The nature of the Giclas +4 stars". Astronomical Journal 86: 1220–1227. doi:10.1086/113001. Bibcode: 1981AJ.....86.1220W. 
  5. ↑ Montes, D. et al. (November 2001). "Late-type members of young stellar kinematic groups - I. Single stars". Monthly Notices of the Royal Astronomical Society 328 (1): 45–63. doi:10.1046/j.1365-8711.2001.04781.x. Bibcode: 2001MNRAS.328...45M. 
  6. ↑ "The One Hundred Nearest Star Systems". RECONS. Georgia State University. January 1, 2009. http://www.chara.gsu.edu/~thenry/RECONS/TOP100.posted.htm. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Cifuentes, C.; Caballero, J. A.; Cortés-Contreras, M.; Montes, D.; Abellán, F. J.; Dorda, R.; Holgado, G.; Zapatero Osorio, M. R. et al. (2020-10-01). "CARMENES input catalogue of M dwarfs. V. Luminosities, colours, and spectral energy distributions". Astronomy and Astrophysics 642: A115. doi:10.1051/0004-6361/202038295. ISSN 0004-6361. Bibcode: 2020A&A...642A.115C. 
  8. ↑ 8.0 8.1 Reiners, Ansgar; Basri, Gibor (February 2007). "The First Direct Measurements of Surface Magnetic Fields on Very Low Mass Stars". The Astrophysical Journal 656 (2): 1121–1135. doi:10.1086/510304. Bibcode: 2007ApJ...656.1121R. 
  9. ↑ 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. doi:10.1111/j.1365-2966.2010.17101.x. Bibcode: 2010MNRAS.407.2269M. 
  10. ↑ Jenkins, J. S. (October 2009). "Rotational Velocities for M Dwarfs". The Astrophysical Journal 704 (2): 975–988. doi:10.1088/0004-637X/704/2/975. Bibcode: 2009ApJ...704..975J. 
  11. ↑ Lestrade, J.-F. et al. (November 2009). "Search for cold debris disks around M-dwarfs. II". Astronomy and Astrophysics 506 (3): 1455–1467. doi:10.1051/0004-6361/200912306. Bibcode: 2009A&A...506.1455L. 
  12. ↑ Pettersen, B. R. (February 1981). "Discovery of flare activity on the very low luminosity red dwarf G 51-15". Astronomy & Astrophysics 95: 135–137. Bibcode: 1981A&A....95..135P. https://ui.adsabs.harvard.edu/abs/1981A&A....95..135P. Retrieved 11 November 2021. 
  13. ↑ Kirkpatrick, J. Davy; Marocco, Federico; Gelino, Christopher R.; Raghu, Yadukrishna; Faherty, Jacqueline K.; Bardalez Gagliuffi, Daniella C.; Schurr, Steven D.; Apps, Kevin et al. (2024-04-01). "The Initial Mass Function Based on the Full-sky 20 pc Census of ∼3600 Stars and Brown Dwarfs". The Astrophysical Journal Supplement Series 271 (2): 55. doi:10.3847/1538-4365/ad24e2. ISSN 0067-0049. Bibcode: 2024ApJS..271...55K. 
  14. ↑ 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. https://books.google.com/books?id=4zjv84hHNPcC&pg=PA9. 
  15. ↑ Pettersen, B. R. (February 1981). "Discovery of flare activity on the very low luminosity red dwarf G 51-15". Astronomy and Astrophysics 95: 135–137. Bibcode: 1981A&A....95..135P. https://articles.adsabs.harvard.edu/pdf/1981A%26A....95..135P. Retrieved 31 December 2024. 
  16. ↑ Kholopov, P. N.; Samus, N. N.; Kazarovets, E. V.; Perova, N. B. (March 1985). "The 67th Name-List of Variable Stars". Information Bulletin on Variable Stars 2681: 1–32. Bibcode: 1985IBVS.2681....1K. https://ibvs.konkoly.hu/pub/ibvs/2601/2681.pdf. Retrieved 31 December 2024. 
  17. ↑ Gregsen, Eric. "Red dwarf star" (in en). Britannica. https://www.britannica.com/science/red-dwarf-star. 
  18. ↑ Lestrade, J.-F. et al. (December 2006). "Search for cold debris disks around M-dwarfs". Astronomy and Astrophysics 460 (3): 733–741. doi:10.1051/0004-6361:20065873. Bibcode: 2006A&A...460..733L. 

Further reading



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