Astronomy:WD 0346+247
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Taurus[1] |
| Right ascension | 03h 46m 46.517s[2] |
| Declination | +24° 56′ 02.67″[2] |
| Apparent magnitude (V) | 19.0[3] |
| Characteristics | |
| Evolutionary stage | white dwarf |
| Spectral type | DX13[4] |
| U−B color index | +0.30[3] |
| B−V color index | +1.44[3] |
| Astrometry | |
| Proper motion (μ) | RA: +520.177[2] mas/yr Dec.: −1,157.434[2] mas/yr |
| Parallax (π) | 25.2941 ± 0.2085[2] mas |
| Distance | 129 ± 1 ly (39.5 ± 0.3 pc) |
| Absolute magnitude (MV) | 16.80[4] |
| Details | |
| Mass | 0.553±0.031[5] M☉ |
| Radius | 0.011±0.001[5] R☉ |
| Luminosity | 0.000048[5] L☉ |
| Temperature | 4,197±83[6] K |
| Age | 11.49±1.51[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
WD 0346+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.[8] Although referred to as WD 0346+246 in the discovery paper, it is more correctly designated WD 0346+247.[4]
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.[6]
References
- ↑ 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.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 3.0 3.1 3.2 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. doi:10.1086/427854. Bibcode: 2005AJ....129.1483L.
- ↑ 4.0 4.1 4.2 McCook, G. P.; Sion, E. M. (2014). "Entry for WD 0642-166". CDS. http://vizier.u-strasbg.fr/viz-bin/VizieR-S?WD%200642-166.
- ↑ 5.0 5.1 5.2 5.3 5.4 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. doi:10.1093/mnras/stab079. Bibcode: 2021MNRAS.502.1753T.
- ↑ 6.0 6.1 "12-Billion-Year-Old White-Dwarf Stars Only 100 Light-Years Away". April 26, 2012. http://www.spacedaily.com/reports/12_Billion_Year_Old_White_Dwarf_Stars_Only_100_Light_Years_Away_999.html.
- ↑ "WD 0343+247". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=WD+0343%2B247.
- ↑ 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. doi:10.1086/316797. Bibcode: 1997ApJ...489L.157H.
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