G 9-38

G 9-38, also known as EI Cancri and GJ 1116, is a binary star system consisting of two M-type stars.[11] At 16.7 light-years from the Sun, the system is relatively nearby.[12] The system has a very high stellar flare activity, with average five flares per hour.[1]

GJ 1116

An ultraviolet band light curve showing several flares on EI Cancri, adapted from Pettersen (1985)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Cancer
Right ascension 08h 58m 15.194s[2]
Declination +19° 45′ 47.08″[2]
Apparent magnitude (V) 13.720[3]
Characteristics
Spectral type M8Ve+M7V[4][5]
Astrometry
G 9-38 A
Radial velocity (Rv)13 ± 5[6] km/s
Proper motion (μ) RA: −767.060±0.122[7] mas/yr
Dec.: −100.176±0.083[7] mas/yr
Parallax (π)194.1443 ± 0.1228 mas[7]
Distance16.80 ± 0.01 ly
(5.151 ± 0.003 pc)
G 9-38 B
Proper motion (μ) RA: −937.133±0.190[8] mas/yr
Dec.: −34.559±0.138[8] mas/yr
Parallax (π)196.2619 ± 0.1976 mas[8]
Distance16.62 ± 0.02 ly
(5.095 ± 0.005 pc)
Orbit
PrimaryG 9-38A
CompanionG 9-38B
Period (P)360 yr
Semi-major axis (a)33 AU
Details[9][10]
G 9-38A
Mass0.12 M☉
Luminosity (bolometric)0.000965 L☉
Temperature2896±18 K
Metallicity [Fe/H]-0.12(unreliable) dex
G 9-38B
Mass0.10 M☉
Luminosity (bolometric)0.000992 L☉
Other designations
EI Cnc, GJ 1116, WDS J08582+1945AB, G 9-38, G 47-14, G 41-11, LP 426-40, LTT 12343, PLX 2144.03, GSC 01397-01138, 2MASS J08581519+1945470
A: Gaia DR2 660597997696173440, LHS 2076[4], NLTT 20638[4]
B: Gaia DR2 660597997697274752, LHS 2077[5], NLTT 20637[5]
Database references
SIMBADThe system
A
B
G 9-38 is located in the constellation Cancer
G 9-38 is located in the constellation Cancer
G 9-38
Location of G 9-38 in the constellation Cancer

In 2015, the search for third star in the system has yielded inconclusive results.[13]

References
  1. Pettersen, B. R. (July 1985). "Discovery of flare activity on the low luminosity red dwarf system G9-38 AB". Astronomy & Astrophysics. 148: 151–154. Bibcode:1985A&A...148..151P. Retrieved 11 November 2021.
  2. Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
  3. Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. Bibcode:2012yCat.1322....0Z.
  4. "G9-38A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 September 2020.
  5. "G9-38B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 September 2020.
  6. "G9-38". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 September 2020.
  7. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  8. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  9. Rojas-Ayala, Bárbara; Covey, Kevin R.; Muirhead, Philip S.; Lloyd, James P. (2011), "Metallicity and Temperature Indicators in M dwarf K band Spectra: Testing New & Updated Calibrations With Observations of 133 Solar Neighborhood M dwarfs", The Astrophysical Journal, 748 (2): 93, arXiv:1112.4567, doi:10.1088/0004-637X/748/2/93, S2CID 41902340
  10. Nearby Star Summary Table
  11. Vizier query: Name=G* 1116, Centre de Données astronomiques de Strasbourg , accessed 30 December 2012.
  12. Nearby Stars Catalog (NSC) Archived 2021-02-27 at the Wayback Machine, Planetary Habitability Laboratory, University of Puerto Rico at Arecibo accessed 31 December 2012.
  13. Davison, Cassy L.; White, R. J.; Henry, T. J.; Riedel, A. R.; Jao, W-C.; Bailey Iii, J. I.; Quinn, S. N.; Cantrell, J. R.; Subasavage, J. P.; Winters, J. G. (2015), "A 3D Search for Companions to 12 Nearby M-Dwarfs", The Astronomical Journal, 149 (3): 106, arXiv:1501.05012, Bibcode:2015AJ....149..106D, doi:10.1088/0004-6256/149/3/106, S2CID 9719725
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