Astronomy:LHS 2065
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Short description: Red dwarf star in the constellation Hydra
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Hydra[2] |
| Right ascension | Template:Ra[3] |
| Declination | −03° 29′ 32.1975″[3] |
| Apparent magnitude (V) | +18.959[4] |
| Characteristics | |
| Evolutionary stage | main sequence[5] |
| Spectral type | M9V[5] |
| Variable type | Flare star[6] |
| Astrometry | |
| Radial velocity (Rv) | 7±2[7] km/s |
| Proper motion (μ) | RA: −516.605[3] mas/yr Dec.: −199.652[3] mas/yr |
| Parallax (π) | 115.4876 ± 0.0726[3] mas |
| Distance | 28.24 ± 0.02 ly (8.659 ± 0.005 pc) |
| Details | |
| Mass | 0.082±0.002[8] M☉ |
| Radius | 0.113±0.006[8] R☉ |
| Luminosity | 3.39+0.16 −0.15×10−4[9] L☉ |
| Surface gravity (log g) | ~5.5[9] cgs |
| Temperature | 2,317+61 −56[8] K |
| Age | >0.5[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
LHS 2065 is a red dwarf star, one of the smallest stars ever found with around 8.2% the mass of the Sun and a diameter only 10% greater than Jupiter.[8] It is one of the few ultracool dwarfs known to have flare activity, emitting one flare every 33 hours,[6] and is also an active X-ray emitter.[5]
Parallax measurements by the Gaia spacecraft give a distance of 8.66 parsecs (28.2 ly) to LHS 2065.[3] This star was first recorded by the Luyten Half-Second catalogue, a catalogue of stars with proper motions exceeding 0.5". The star's main identifier is named after this catalogue.[11] It is located in the Hydra constellation.[2]
This star has a spectral type of M9V,[5] indicating a very cool star at the end of the main sequence. It is among the nearest ultracool dwarfs to Earth.[6] LHS 2065 has an effective temperature of around 2,317 K,[8] 2.5 times less than the Sun. The lack of lithium in the star's atmosphere indicate that it must be over 500 million years old.[6]
See also
References
- ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
- ↑ 2.0 2.1 Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R Constellation record for this object at VizieR.
- ↑ 3.0 3.1 3.2 3.3 3.4 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.
- ↑ Costa, Edgardo; Méndez, René A.; Jao, W. -C.; Henry, Todd J.; Subasavage, John P.; Brown, Misty A.; Ianna, Philip A.; Bartlett, Jennifer (2005). "The Solar Neighborhood. XIV. Parallaxes from the Cerro Tololo Inter-American Observatory Parallax Investigation-First Results from the 1.5 m Telescope Program". The Astronomical Journal 130 (1): 337. doi:10.1086/430473. Bibcode: 2005AJ....130..337C.
- ↑ 5.0 5.1 5.2 5.3 Robrade, J.; Schmitt, J. H. M. M. (2008-09-01). "Quiescent X-ray emission from the M9 dwarf LHS 2065" (in en). Astronomy & Astrophysics 487 (3): 1139–1141. doi:10.1051/0004-6361:200810142. ISSN 0004-6361. Bibcode: 2008A&A...487.1139R. https://www.aanda.org/articles/aa/abs/2008/33/aa10142-08/aa10142-08.html.
- ↑ 6.0 6.1 6.2 6.3 6.4 Martín, Eduardo L.; Ardila, David R. (2001-05-01). "Flares at the Cool End of the M Dwarfs: The Case of LHS 2065". The Astronomical Journal 121 (5): 2758–2760. doi:10.1086/320412. ISSN 0004-6256. Bibcode: 2001AJ....121.2758M. https://ui.adsabs.harvard.edu/abs/2001AJ....121.2758M/abstract.
- ↑ Burgasser, Adam J.; Logsdon, Sarah E.; Gagné, Jonathan; Bochanski, John J.; Faherty, Jaqueline K.; West, Andrew A.; Mamajek, Eric E.; Schmidt, Sarah J. et al. (2015). "The Brown Dwarf Kinematics Project (BDKP). IV. Radial Velocities of 85 Late-M and L Dwarfs with MagE". The Astrophysical Journal Supplement Series 220 (1): 18. doi:10.1088/0067-0049/220/1/18. Bibcode: 2015ApJS..220...18B.
- ↑ 8.0 8.1 8.2 8.3 8.4 Pineda, J. Sebastian et al. (September 2021). "The M-dwarf Ultraviolet Spectroscopic Sample. I. Determining Stellar Parameters for Field Stars". The Astrophysical Journal 918 (1): 23. doi:10.3847/1538-4357/ac0aea. 40. Bibcode: 2021ApJ...918...40P.
- ↑ 9.0 9.1 Sanghi, Aniket; Liu, Michael C.; Best, William M. J.; Dupuy, Trent J.; Siverd, Robert J.; Zhang, Zhoujian; Hurt, Spencer A.; Magnier, Eugene A. et al. (2023-12-06). "The Hawaii Infrared Parallax Program. VI. The Fundamental Properties of 1000+ Ultracool Dwarfs and Planetary-mass Objects Using Optical to Mid-infrared Spectral Energy Distributions and Comparison to BT-Settl and ATMO 2020 Model Atmospheres" (in en). The Astrophysical Journal 959 (1): 63. doi:10.3847/1538-4357/acff66. ISSN 0004-637X. Bibcode: 2023AAS...24120311S. Note: See Zenodo tables
- ↑ "LHS 2065". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=LHS+2065.
- ↑ Luyten, Willem J. (1979-01-01). LHS catalogue. A catalogue of stars with proper motions exceeding 0"5 annually. Bibcode: 1979lccs.book.....L. https://ui.adsabs.harvard.edu/abs/1979lccs.book.....L/abstract.
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