GJ 3685
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo |
| Right ascension | 11h 47m 40.74723s[1] |
| Declination | +00° 15′ 20.1018″[1] |
| Apparent magnitude (V) | 13.34[2] |
| Characteristics | |
| Spectral type | M4V[3] |
| V−R color index | +1.22[4] |
| R−I color index | +1.55[4] |
| Variable type | Flare star |
| Astrometry | |
| Radial velocity (Rv) | 7.02 ± 0.32[5] km/s |
| Proper motion (μ) | RA: −314.284 mas/yr[1] Dec.: −100.757 mas/yr[1] |
| Parallax (π) | 53.1361 ± 0.0304 mas[1] |
| Distance | 61.38 ± 0.04 ly (18.82 ± 0.01 pc) |
| Details | |
| Surface gravity (log g) | 4.5[6] cgs |
| Temperature | 3100[6] K |
| Metallicity | 0.23[3] |
| Rotational velocity (v sin i) | 5.60 ± 1.40[5] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
GJ 3685 is a star in the constellation of Leo. It is extremely faint; its apparent magnitude is 13.3,[2] and can only be seen with a ten-inch (25 cm) telescope (see Limiting magnitude). Based on a parallax of 53.1361 milliarcseconds,[1] the system is located 61.4 light-years (18.8 parsecs) away from the Earth.
This is a part of a binary star system consisting of two components separated by 24″.[8] The primary component, GJ 3685 (also known as GJ 3685 A), is a very old red dwarf that is also a flare star. A 20-minute flare was observed in 2004 by the GALEX satellite.[9] Its companion, GJ 3686, is another faint red dwarf with a spectral type of M5. It is also known as LP 613-50 and is also located roughly the same distance as its primary.[10]
References
[edit]- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. 1322. Bibcode:2012yCat.1322....0Z.
- ^ a b Newton, Elisabeth R. (2014). "Near-infrared Metallicities, Radial Velocities, and Spectral Types for 447 Nearby M Dwarfs". The Astronomical Journal. 147 (1): 20. arXiv:1310.1087. Bibcode:2014AJ....147...20N. doi:10.1088/0004-6256/147/1/20. S2CID 26818462.
- ^ a b "N1 990 A". ARICNS. Centre of Astronomy, Heidelberg University. 5 November 1998. Retrieved 21 March 2017.
- ^ a b Deshpande, R.; Blake, C. H.; Bender, C. F.; Mahadevan, S.; Terrien, R. C.; Carlberg, J. K.; Zasowski, G.; Crepp, J.; Rajpurohit, A. S.; Reylé, C.; Nidever, D. L.; Schneider, D. P.; Prieto, C. Allende; Bizyaev, D.; Ebelke, G.; Fleming, S. W.; Frinchaboy, P. M.; Ge, J.; Hearty, F.; Hernández, J.; Malanushenko, E.; Malanushenko, V.; Majewski, S. R.; Marchwinski, R.; Muna, D.; Oravetz, D.; Pan, K.; Schiavon, R. P.; Shetrone, M.; et al. (2013). "The Sdss-Iii Apogee Radial Velocity Survey of M Dwarfs. I. Description of the Survey and Science Goals". The Astronomical Journal. 146 (6): 156. arXiv:1307.8121. Bibcode:2013AJ....146..156D. doi:10.1088/0004-6256/146/6/156. S2CID 118667962.
- ^ a b Lépine, Sébastien (2013). "A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky". The Astronomical Journal. 145 (4): 102. arXiv:1206.5991. Bibcode:2013AJ....145..102L. doi:10.1088/0004-6256/145/4/102. S2CID 117144290.
- ^ "GJ 3685 A -- Flare Star". SIMBAD Astronomical Database. Centre de données astronomiques de Strasbourg.
- ^ "N1 990 B". ARICNS. Centre of Astronomy, Heidelberg University. 5 November 1998. Retrieved 21 March 2017.
- ^ Robinson, Richard D.; Wheatley, Jonathan M.; Welsh, Barry Y.; Forster, Karl; Morrissey, Patrick; Seibert, Mark; Rich, R. Michael; Salim, Samir; Barlow, Tom A.; Bianchi, Luciana; Byun, Yong-Ik; Donas, Jose; Friedman, Peter G.; Heckman, Timothy M.; Jelinsky, Patrick N.; Lee, Young-Wook; Madore, Barry F.; Malina, Roger F.; Martin, D. Christopher; Milliard, Bruno; Neff, Susan G.; Schiminovich, David; Siegmund, Oswald H. W.; Small, Todd; Szalay, Alex S.; Wyder, Ted K. (2005). "GALEX Observations of an Energetic Ultraviolet Flare on the dM4e Star GJ 3685A". The Astrophysical Journal. 633 (1): 447–51. arXiv:astro-ph/0507396. Bibcode:2005ApJ...633..447R. doi:10.1086/444608. S2CID 14054351.
- ^ Phan-Bao, N.; Bessell, M. S. (2006). "Spectroscopic distances of nearby ultracool dwarfs". Astronomy and Astrophysics. 446 (2): 515–523. arXiv:astro-ph/0509321. Bibcode:2006A&A...446..515P. doi:10.1051/0004-6361:20054064. S2CID 18565840.
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