astro.wikisort.org - StarWD 0343+247 is a white dwarf in the ecliptic constellation of Taurus. It was discovered in 1997 when examination of photographs taken for a survey of brown dwarfs in the Pleiades revealed a faint star with high proper motion. It is one of the coolest white dwarfs known, with an effective temperature estimated to be approximately 3,800 K equivalent to a spectral type of M0.[7] Although referred to as WD 0346+246 in the discovery paper, it is more correctly designated WD 0346+247.[3]
White dwarf in the constellation Taurus
WD 0343+247
Observation data
Epoch J2000.0 Equinox J2000.0 (ICRS) |
| Constellation |
Taurus |
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| Right ascension |
03h 46m 46.517s[1] |
| Declination |
+24° 56′ 02.67″[1] |
| Apparent magnitude (V) |
19.0[2] |
| Characteristics |
| Evolutionary stage |
white dwarf |
| Spectral type |
DX13[3] |
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| U−B color index |
+0.30[2] |
| B−V color index |
+1.44[2] |
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| Astrometry |
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| Proper motion (μ) | RA: 520.177[1] mas/yr
Dec.: −1,157.434[1] mas/yr |
| Parallax (π) | 25.2941 ± 0.2085 mas[1] |
| Distance | 129 ± 1 ly
(39.5 ± 0.3 pc) |
| Absolute magnitude (MV) | 16.80[3] |
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| Details |
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| Mass | 0.553±0.031[4] M☉ |
| Radius | 0.011±0.001[4] R☉ |
| Luminosity | 0.000048[4] L☉ |
| Temperature | 4,197±83[5] K |
| Age | 11.49±1.51[4] Gyr |
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| Other designations |
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WD 0343+247, EQ J0346+249, [6] J0346+2455 [4] |
| Database references |
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| SIMBAD | data |
Recent studies using NASA's Spitzer Space Telescope and MDM Observatory's 2.4-meter telescope (near Tucson, Arizona, USA) shows that this white dwarf (together with another one: SDSS J110217.48+411315.4) has a low (for white dwarfs) surface temperature between 3,700 and 3,800 K due to it being 11 to 12 billion years old.[5]
References
- "Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)". VizieR Online Data Catalog: I/355. May 2022. Bibcode:2022yCat.1355....0G. Gaia DR3 record for this source at VizieR.
- Lépine, Sébastien; Shara, Michael M. (March 2005). "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)". The Astronomical Journal. 129 (3): 1483–1522. arXiv:astro-ph/0412070. Bibcode:2005AJ....129.1483L. doi:10.1086/427854. S2CID 2603568.
- McCook, G. P.; Sion, E. M. (2014). "Entry for WD 0642-166". A Catalogue of Spectroscopically Identified White Dwarfs. VizieR Online Data Catalog. CDS. Bibcode:2016yCat....102035M.
- Torres, Santiago; Rebassa-Mansergas, Alberto; Camisassa, María E.; Raddi, Roberto (2021). "The Gaia DR2 halo white dwarf population: The luminosity function, mass distribution, and its star formation history". Monthly Notices of the Royal Astronomical Society. 502 (2): 1753. arXiv:2101.03341. Bibcode:2021MNRAS.502.1753T. doi:10.1093/mnras/stab079.
- "12-Billion-Year-Old White-Dwarf Stars Only 100 Light-Years Away".
- "WD 0343+247". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 5, 2007.
- Hambly, N. C.; Smartt, S. J.; Hodgkin, S. T. (1997). "WD 0346+246: A Very Low Luminosity, Cool Degenerate in Taurus". The Astrophysical Journal. 489. Bibcode:1997ApJ...489L.157H. doi:10.1086/316797. S2CID 118643795.
На других языках
- [en] WD 0343+247
[ru] WD 0346+246
WD 0346 + 246 — белый карлик в созвездии Тельца.
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