| 词条 | WD 0346+246 |
| 释义 |
epoch=J2000.0 (ICRS) | constell=Taurus | ra={{RA|03|46|46.508}}[1] | dec={{DEC|+24|56|02.82}}[1] | appmag_v=19.0[1] }}{{Starbox astrometry |prop_mo_ra=547[1] | prop_mo_dec=-1182[1] | parallax=36 | parallax_footnote=[1] | p_error=5 }}{{Starbox detail | mass = {{nowrap|0.77}}[2] | radius = {{nowrap|0.011 ± 0.001}}[8] | temperature = {{nowrap|3,800 ± 100}}[8] | age_gyr = 11 - 12 [8] }}{{Starbox catalog |{{Starbox reference |Simbad=WD+0346%2B246 }}{{Starbox end}}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.[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. [4]References1. ^1 2 3 4 5 6 {{cite simbad|title=WD 0346+246|accessdate=November 5, 2007}} {{Stars of Taurus}}{{whitedwarf-star-stub}}2. ^https://arxiv.org/pdf/1204.2570v1.pdf 3. ^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. 4. ^1 2 3 http://www.spacedaily.com/reports/12_Billion_Year_Old_White_Dwarf_Stars_Only_100_Light_Years_Away_999.html 2 : Taurus (constellation)|White dwarfs |
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