DX Cancri

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Star
DX Cancri
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation cancer
Right ascension 08 h 29 m 49.35 s
declination + 26 ° 46 ′ 33.6 ″
Apparent brightness 14.81 mag
Typing
B − V color index +2.08 
U − B color index +2.11 
Spectral class M6.5 V
Variable star type UV 
Astrometry
Radial velocity +9.0 km / s
parallax 279.29 ± 0.13  mas
distance 11.67 ± 0.01  ly
3.58 ± 0.01  pc
Visual absolute brightness M vis 17.10 mag
Proper movement 
Rec. Share: (-1113.74 ± 0.25)  mas / a
Dec. portion: (-612.37 ± 0.17)  mas / a
Physical Properties
Dimensions 0.09  M ☉
radius 0.11  R ☉
Luminosity

0.00065  L ☉

Effective temperature 2,840  K
Rotation time 0.46 d
Age 200 million  a
Other names
and catalog entries
Gliese catalog FY 1111 [1]
2MASS catalog 2MASS J08294949 + 2646348 [2]
Other names DX Cancri, G 51-15, GCTP 2016.01, LHS 248

DX Cancri (GJ 1111, G 51-15) is a variable star in the northern constellation Cancer . With an apparent magnitude of 14.81, it is far too faint to be seen with the naked eye. A telescope with an aperture of at least 16 inches (41 cm) is required to observe this star . Based on measurements of parallax , DX Cancri is 11.67 light years from Earth. It is thus in the top 20 of the closest stars to the sun .

The star has a spectral class of M6.5V and is therefore a red dwarf in the main sequence . Its mass is 9% of the solar mass and its radius is 11% of the solar radius . The stellar atmosphere has an effective temperature of 2,840 Kelvin , which gives DX Cancri the cool red-orange glow of an M star . DX Cancri is a flare star with random changes in its brightness with an increase of up to five times.

The star was examined for an infrared excess caused by cold interstellar dust, but none was found. DX Cancri may be a member of the Castor cluster of motion , whose stars share common motion through space. This group is estimated to be 200 million years old.

distance

Determining the distance for DX Cancri

source Parallax (mas) Distance (pc) Distance (Lj) Distance ( pm )
Gliese & Jahreiß (1991) 275.8 ± 3.0 3.63 ± 0.04 11.83 ± 0.1 111.9 ± 1.2
van Altena et al. (1995) 275.8 ± 3.0 3.63 ± 0.04 11.83 ± 0.1 111.9 ± 1.2
RECONS TOP100 (2012) 275.8 ± 3.0 3.63 ± 0.04 11.83 ± 0.1 111.9 ± 1.2
Dittmann et al. (2014) 275.30 ± 4.10 3.63 ± 0.05 11.85 +0.18 -0.17 112.1 +1.7 -1.6
Gaia DR2 (2018) 279.29 ± 0.13 3.58 ± 0.01 11.67 ± 0.01 110.42 ± 0.05

Non-trigonometric distance determinations are marked in italics . The most precise determination is marked in bold .

Web links

  • SolStation.com: DX Cancri. Retrieved March 27, 2015 .
  • David's Astronomy Pages (Projects): Nearby Stars. Retrieved March 27, 2015 .

Individual evidence

  1. ↑ a b c d e G 51-15. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed September 16, 2018 .
  2. ↑ a b D. Weistrop: The nature of the Giclas +4 stars . In: The Astronomical Journal . tape 86 , August 1, 1981, ISSN  0004-6256 , pp. 1220-1227 , doi : 10.1086 / 113001 , bibcode : 1981AJ ..... 86.1220W .
  3. ↑ a b K. L. Luhman, KN Allers, DT Jaffe, MC Cushing, KA Williams, CL Slesnick, WD Vacca: Oph 1622-2405: Not a Planetary-Mass Binary . In: The Astrophysical Journal . tape 659 , no. 2 , April 20, 2007, ISSN  0004-637X , p. 1629-1636 , doi : 10.1086 / 512539 , arxiv : astro-ph / 0701242 .
  4. ↑ DX Cnc. In: VSX. AAVSO, accessed September 16, 2018 .
  5. ^ D. Montes, J. Lopez-Santiago, MC Galvez, MJ Fernandez-Figueroa, E. De Castro, M. Cornide: Late-type stars members of young stellar kinematic groups - I. Single stars . In: Monthly Notices of the Royal Astronomical Society . tape 328 , no. 1 , ISSN  0035-8711 , p. 45–63 , doi : 10.1046 / j.1365-8711.2001.04781.x , arxiv : astro-ph / 0106537 .
  6. ↑ a b c d RECONS: THE ONE HUNDRED NEAREST STAR SYSTEMS. Retrieved March 27, 2015 .
  7. ↑ a b c J. Morin, JF Donati, P. Petit, X. Delfosse, T. Forveille, MM Jardine: Large-scale magnetic topologies of late M dwarfs . In: Monthly Notices of the Royal Astronomical Society . tape 407 , no. 4 , July 20, 2010, ISSN  0035-8711 , p. 2269–2286 , doi : 10.1111 / j.1365-2966.2010.17101.x , arxiv : 1005.5552 .
  8. ↑ AA Vidotto, M. Jardine, J. Morin, J.-F. Donati, P. Lang, AJB Russell: Effects of M dwarf magnetic fields on potentially habitable planets . In: Astronomy & Astrophysics . tape 557 , ISSN  0004-6361 , p. A67 , doi : 10.1051 / 0004-6361 / 201321504 , arxiv : 1306.4789 .
  9. ^ A b A. Reiners, G. Basri: The First Direct Measurements of Magnetic Fields on Very Low-Mass Stars . In: The Astrophysical Journal . tape 656 , no. 2 , February 20, 2007, ISSN  0004-637X , p. 1121–1135 , doi : 10.1086 / 510304 , arxiv : astro-ph / 0610365 .
  10. ↑ a b J.-F. Lestrade, MC Wyatt, F. Bertoldi, KM Menten, G. Labaigt: Search for Cold Debris Disks around M-dwarfs. II . In: Astronomy and Astrophysics . tape 506 , no. 3 , ISSN  0004-6361 , p. 1455-1467 , doi : 10.1051 / 0004-6361 / 200912306 , arxiv : 0907.4782 .
  11. ↑ P. Clay Sherrod, Thomas L. Koed: A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations . Courier Corporation, 2003, ISBN 978-0-486-42820-8 , pp. 9 ( books.google.de ).
  12. ↑ J.-F. Lestrade, MC Wyatt, F. Bertoldi, WRF Dent, KM Menten: Search for Cold Debris Disks around M-dwarfs . In: Astronomy and Astrophysics . tape 460 , no. 3 , ISSN  0004-6361 , p. 733-741 , doi : 10.1051 / 0004-6361: 20065873 , arxiv : astro-ph / 0609574 .
  13. ↑ Gliese, W. and Jahreiß, H .: GJ 1111. Retrieved on March 27, 2015 .
  14. ^ Van Altena WF, Lee JT, Hoffleit ED: GCTP 2016.01. Retrieved March 27, 2015 .
  15. ↑ Jason A. Dittmann, Jonathan M. Irwin, David Charbonneau, Zachory K. Berta-Thompson: Trigonometric Parallaxes for 1,507 Nearby Mid-to-Late M-dwarfs . In: Astrophysics . December 11, 2013, arxiv : 1312.3241 .