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.[8] At 16.7 light-years from the Sun, the system is relatively nearby.[9] The system has a very high stellar flare activity, with average five flares per hour.[10]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 58m 15.194s[1] |
| Declination | +19° 45′ 47.08″[1] |
| Apparent magnitude (V) | 13.720[2] |
| Characteristics | |
| Spectral type | M8Ve+M7V[3][4] |
| Astrometry | |
| Radial velocity (Rv) | 13 ± 5[5] km/s |
| Proper motion (μ) | RA: −862.0[2] mas/yr Dec.: −54.0[2] mas/yr |
| Parallax (π) | 194.9 ± 0.4[3][4] mas |
| Distance | 16.73 ± 0.03 ly (5.13 ± 0.01 pc) |
| Orbit | |
| Primary | G 9-38A |
| Companion | G 9-38B |
| Period (P) | 360 yr |
| Semi-major axis (a) | 33 AU |
| Details[6][7] | |
| G 9-38A | |
| Mass | 0.12 M☉ |
| Luminosity (bolometric) | 0.000965 L☉ |
| Temperature | 2896±18 K |
| Metallicity [Fe/H] | -0.12(unreliable) dex |
| G 9-38B | |
| Mass | 0.10 M☉ |
| Luminosity (bolometric) | 0.000992 L☉ |
| Other designations | |
| A: Gaia DR2 660597997696173440, LHS 2076[3], NLTT 20638[3] | |
| B: Gaia DR2 660597997697274752, LHS 2077[4], NLTT 20637[4] | |
| Database references | |
| SIMBAD | The system |
| A | |
| B | |
In 2015, the search for third star in the system has yielded inconclusive results.[11]
References
- Cutri, R. M.; et al. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. Bibcode:2003yCat.2246....0C.
- Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. Bibcode:2012yCat.1322....0Z.
- "G9-38A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 September 2020.
- "G9-38B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 September 2020.
- "G9-38". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 September 2020.
- 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
- Nearby Star Summary Table
- Vizier query: Name=G* 1116, Centre de Données astronomiques de Strasbourg , accessed 30 December 2012.
- Nearby Stars Catalog (NSC), Planetary Habitability Laboratory, University of Puerto Rico at Arecibo accessed 31 December 2012.
- Discovery of flare activity on the low luminosity red dwarf system G9-38 AB
- 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
- Dittmann, Jason A.; Irwin, Jonathan M.; Charbonneau, David; Berta-Thompson, Zachory K. (2014). "Trigonometric Parallaxes for 1507 Nearby Mid-to-late M Dwarfs". The Astrophysical Journal. 784 (2): 156. arXiv:1312.3241. Bibcode:2014ApJ...784..156D. doi:10.1088/0004-637X/784/2/156. S2CID 18789867. Table with parallaxes.
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