| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Taurus |
| Right ascension | 03h 46m 46.508s[1] |
| Declination | +24° 56′ 02.82″[1] |
| Apparent magnitude (V) | 19.0[1] |
| Astrometry | |
| Proper motion (μ) | RA: 547[1] mas/yr Dec.: -1182[1] mas/yr |
| Parallax (π) | 36 ± 5[1] mas |
| Distance | approx. 90 ly (approx. 28 pc) |
| Details | |
| Mass | 0.77[2] M☉ |
| Radius | 0.011 ± 0.001[3] R☉ |
| Temperature | 3,800 ± 100[3] K |
| Age | 11 - 12 [3] Gyr |
| Other designations | |
WD 0346+246, WD J0346+249[1] | |
| Database references | |
| SIMBAD | data |
WD 0346+246 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 3900 K equaling to a spectral type of M0.[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 3700 and 3800 K due to it being 11 to 12 billion years old. [3]
References
- ^ a b c d e f g "WD 0346+246". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 5, 2007.
- ^ Kilic, Mukremin; Thorstensen, John R.; Kowalski, P. M.; Andrews, J. (2012). "11-12 Gyr old white dwarfs 30 pc away". Monthly Notices of the Royal Astronomical Society: Letters. 423 (1): L132–L136. arXiv:1204.2570. Bibcode:2012MNRAS.423L.132K. doi:10.1111/j.1745-3933.2012.01271.x. S2CID 117577867.
- ^ a b c d http://www.spacedaily.com/reports/12_Billion_Year_Old_White_Dwarf_Stars_Only_100_Light_Years_Away_999.html
- ^ WD 0346+246: A Very Low Luminosity, Cool Degenerate in Taurus, N. C. Hambly, S. J. Smartt, and S. Hodgkin, Astrophysical Journal Letters 489 (November 1997), pp. L157–L160.