| Observation data Epoch J2000 [1] Equinox J2000 [1] | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 05h 32m 53.46s [1] |
| Declination | +82° 46′ 46.5″ [1] |
| Characteristics | |
| Spectral type | L7 [1] |
| Astrometry | |
| Parallax (π) | 40.2369 ± 0.6389 mas [1] |
| Distance | 81 ± 1
ly (24.9 ± 0.4 pc) |
| Details | |
| Mass | 0.077–0.085 [2] M☉ |
| Temperature | 1600 [3] K |
| Metallicity [Fe/H] | -1.6 [3] dex |
| Age | ~10 [3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
2MASS J05325346+8246465 (abbreviated 2MASS J0532+8246) is possibly the first brown dwarf observed in the galactic halo of the Milky Way, and the first known substellar subdwarf star. [4] [5] It was discovered from Two Micron All-Sky Survey data, and verified by observations at Palomar Observatory and W. M. Keck Observatory. [5] It has a low metallicity, which indicates it is an old star. [5]
The mass and temperature of 2MASS 0532+8246 makes it a rare object in stellar-substellar gap between conventional stars and brown dwarfs. [6] It produces roughly half of its luminosity from hydrogen fusion. [3] Such "gap" objects, covering a narrow range of masses but a wide range of temperatures, and powered by unsteady hydrogen fusion, are exotic but expected to be more common among low-metallicity objects like 2MASS J05325346+8246465. [7]
References
- ^ a b c d e f g "2MASS J05325346+8246465 -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2018-12-04.
- ^ Burgasser, Adam J.; Kirkpatrick, J. Davy; Burrows, Adam; Liebert, James; Reid, I. Neill; Gizis, John E.; McGovern, Mark R.; Prato, L.; McLean, Ian S. (2003). "The First Substellar Subdwarf? Discovery of a Metal‐poor L Dwarf with Halo Kinematics". The Astrophysical Journal. 592 (2): 1186–1192. arXiv: astro-ph/0304174. Bibcode: 2003ApJ...592.1186B. doi: 10.1086/375813. S2CID 11895472.
- ^ a b c d Allard, F.; Pinfield, D. J.; Zapatero Osorio, M. R.; Lodieu, N.; Gálvez-Ortiz, M. C.; Burgasser, A. J.; Zhang (张曾华), Z. H. (2019), "Primeval very low-mass stars and brown dwarfs – VI. Population properties of metal-poor degenerate brown dwarfs", Monthly Notices of the Royal Astronomical Society, 486: 1260–1282, arXiv: 1903.05536, doi: 10.1093/mnras/stz777
- ^ Faherty, Jacqueline K.; Burgasser, Adam J.; Walter, Frederick M.; Van der Bliek, Nicole; Shara, Michael M.; Cruz, Kelle L.; West, Andrew A.; Vrba, Frederick J.; Anglada-Escud, Guillem (2012). "The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs". The Astrophysical Journal. 752 (1): 56. arXiv: 1203.5543. Bibcode: 2012ApJ...752...56F. doi: 10.1088/0004-637X/752/1/56. S2CID 18160586.
- ^ a b c Burgasser, Adam J.; et al. (2003). "The First Substellar Subdwarf? Discovery of a Metal-Poor L Dwarf with Halo Kinematics". The Astrophysical Journal. 592 (2): 1186–1192. arXiv: astro-ph/0304174. Bibcode: 2003ApJ...592.1186B. doi: 10.1086/375813. S2CID 11895472.
- ^ Zhang 张曾华, Z. H.; Homeier, D.; Pinfield, D. J.; Lodieu, N.; Jones, H. R. A.; Allard, F.; Pavlenko, Ya. V. (2017), "Primeval very low-mass stars and brown dwarfs – II. The most metal-poor substellar object", Monthly Notices of the Royal Astronomical Society, 468 (1): 261–271, arXiv: 1702.02001, Bibcode: 2017MNRAS.468..261Z, doi: 10.1093/mnras/stx350, S2CID 54847595
- ^ Schneider, Adam C.; Burgasser, Adam J.; Gerasimov, Roman; Marocco, Federico; Gagné, Jonathan; Goodman, Sam; Beaulieu, Paul; Pendrill, William; Rothermich, Austin; Sainio, Arttu; Kuchner, Marc J.; Caselden, Dan; Meisner, Aaron M.; Faherty, Jacqueline K.; Mamajek, Eric E.; Hsu, Chih-Chun; Greco, Jennifer J.; Cushing, Michael C.; Kirkpatrick, J. Davy; Bardalez-Gagliuffi, Daniella; Logsdon, Sarah E.; Allers, Katelyn; Debes, John H. (2020), "WISEA J041451.67–585456.7 and WISEA J181006.18–101000.5: The First Extreme T-type Subdwarfs?", The Astrophysical Journal, 898 (1): 77, arXiv: 2007.03836, Bibcode: 2020ApJ...898...77S, doi: 10.3847/1538-4357/ab9a40, S2CID 220403370
External links
- Entry at DwarfArchives.org Archived 2019-06-10 at the Wayback Machine
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 | This brown dwarf-related article is a stub. You can help Wikipedia by expanding it. |
| Observation data Epoch J2000 [1] Equinox J2000 [1] | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 05h 32m 53.46s [1] |
| Declination | +82° 46′ 46.5″ [1] |
| Characteristics | |
| Spectral type | L7 [1] |
| Astrometry | |
| Parallax (π) | 40.2369 ± 0.6389 mas [1] |
| Distance | 81 ± 1
ly (24.9 ± 0.4 pc) |
| Details | |
| Mass | 0.077–0.085 [2] M☉ |
| Temperature | 1600 [3] K |
| Metallicity [Fe/H] | -1.6 [3] dex |
| Age | ~10 [3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
2MASS J05325346+8246465 (abbreviated 2MASS J0532+8246) is possibly the first brown dwarf observed in the galactic halo of the Milky Way, and the first known substellar subdwarf star. [4] [5] It was discovered from Two Micron All-Sky Survey data, and verified by observations at Palomar Observatory and W. M. Keck Observatory. [5] It has a low metallicity, which indicates it is an old star. [5]
The mass and temperature of 2MASS 0532+8246 makes it a rare object in stellar-substellar gap between conventional stars and brown dwarfs. [6] It produces roughly half of its luminosity from hydrogen fusion. [3] Such "gap" objects, covering a narrow range of masses but a wide range of temperatures, and powered by unsteady hydrogen fusion, are exotic but expected to be more common among low-metallicity objects like 2MASS J05325346+8246465. [7]
References
- ^ a b c d e f g "2MASS J05325346+8246465 -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2018-12-04.
- ^ Burgasser, Adam J.; Kirkpatrick, J. Davy; Burrows, Adam; Liebert, James; Reid, I. Neill; Gizis, John E.; McGovern, Mark R.; Prato, L.; McLean, Ian S. (2003). "The First Substellar Subdwarf? Discovery of a Metal‐poor L Dwarf with Halo Kinematics". The Astrophysical Journal. 592 (2): 1186–1192. arXiv: astro-ph/0304174. Bibcode: 2003ApJ...592.1186B. doi: 10.1086/375813. S2CID 11895472.
- ^ a b c d Allard, F.; Pinfield, D. J.; Zapatero Osorio, M. R.; Lodieu, N.; Gálvez-Ortiz, M. C.; Burgasser, A. J.; Zhang (张曾华), Z. H. (2019), "Primeval very low-mass stars and brown dwarfs – VI. Population properties of metal-poor degenerate brown dwarfs", Monthly Notices of the Royal Astronomical Society, 486: 1260–1282, arXiv: 1903.05536, doi: 10.1093/mnras/stz777
- ^ Faherty, Jacqueline K.; Burgasser, Adam J.; Walter, Frederick M.; Van der Bliek, Nicole; Shara, Michael M.; Cruz, Kelle L.; West, Andrew A.; Vrba, Frederick J.; Anglada-Escud, Guillem (2012). "The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs". The Astrophysical Journal. 752 (1): 56. arXiv: 1203.5543. Bibcode: 2012ApJ...752...56F. doi: 10.1088/0004-637X/752/1/56. S2CID 18160586.
- ^ a b c Burgasser, Adam J.; et al. (2003). "The First Substellar Subdwarf? Discovery of a Metal-Poor L Dwarf with Halo Kinematics". The Astrophysical Journal. 592 (2): 1186–1192. arXiv: astro-ph/0304174. Bibcode: 2003ApJ...592.1186B. doi: 10.1086/375813. S2CID 11895472.
- ^ Zhang 张曾华, Z. H.; Homeier, D.; Pinfield, D. J.; Lodieu, N.; Jones, H. R. A.; Allard, F.; Pavlenko, Ya. V. (2017), "Primeval very low-mass stars and brown dwarfs – II. The most metal-poor substellar object", Monthly Notices of the Royal Astronomical Society, 468 (1): 261–271, arXiv: 1702.02001, Bibcode: 2017MNRAS.468..261Z, doi: 10.1093/mnras/stx350, S2CID 54847595
- ^ Schneider, Adam C.; Burgasser, Adam J.; Gerasimov, Roman; Marocco, Federico; Gagné, Jonathan; Goodman, Sam; Beaulieu, Paul; Pendrill, William; Rothermich, Austin; Sainio, Arttu; Kuchner, Marc J.; Caselden, Dan; Meisner, Aaron M.; Faherty, Jacqueline K.; Mamajek, Eric E.; Hsu, Chih-Chun; Greco, Jennifer J.; Cushing, Michael C.; Kirkpatrick, J. Davy; Bardalez-Gagliuffi, Daniella; Logsdon, Sarah E.; Allers, Katelyn; Debes, John H. (2020), "WISEA J041451.67–585456.7 and WISEA J181006.18–101000.5: The First Extreme T-type Subdwarfs?", The Astrophysical Journal, 898 (1): 77, arXiv: 2007.03836, Bibcode: 2020ApJ...898...77S, doi: 10.3847/1538-4357/ab9a40, S2CID 220403370
External links
- Entry at DwarfArchives.org Archived 2019-06-10 at the Wayback Machine
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| This brown dwarf-related article is a stub. You can help Wikipedia by expanding it. |