WD 0346+246
| 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 | 0.15 ± 0.02[2] M☉ |
| Radius | 0.011 ± 0.001[2] R☉ |
| Temperature | 3,800 ± 100[2] K |
| Age | 11 - 12 [2] Gyr |
| Other designations | |
|
WD 0346+246, WD J0346+249[1]
|
|
WD 0346+246 is a white dwarf. 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.[3]
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 lowest (for white dwarfs) surface temperature about 3700 and 3800 degrees K due to the age of 11 to 12 billion years. [2]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 WD 0346+246, entry in SIMBAD. Accessed on line November 5, 2007.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
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