WD 0343+247

WD 0343+247
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Taurus
Right ascension	03h 46m 46.517s
Declination	+24° 56′ 02.67″
Apparent magnitude (V)	19.0
Characteristics
Evolutionary stage	white dwarf
Spectral type	DX13
U−B color index	+0.30
B−V color index	+1.44
Astrometry
Proper motion (μ)	RA: 520.177 mas/yr ; Dec.: −1,157.434 mas/yr
Parallax (π)	25.2941±0.2085 mas
Distance	129 ± 1 ly ; (39.5 ± 0.3 pc)
Absolute magnitude (MV)	16.80
Details
Mass	0.553±0.031 M☉
Radius	0.011±0.001 R☉
Luminosity	0.000048 L☉
Temperature	4,197±83 K
Age	11.49±1.51 Gyr
Other designations
	WD 0343+247, EQ J0346+249, J0346+2455
Database references
SIMBAD	data

WD 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]

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

^ ^a ^b ^c ^d ^e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ ^a ^b ^c 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.
^ ^a ^b ^c McCook, G. P.; Sion, E. M. (2014). "Entry for WD 0642-166". The VizieR database of astronomical catalogues. CDS.
^ ^a ^b ^c ^d ^e 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.
^ ^a ^b "12-Billion-Year-Old White-Dwarf Stars Only 100 Light-Years Away". Space Daily. April 26, 2012.
^ "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.

[dr3-1] Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[lepine2005-2] 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. arXiv:astro-ph/0412070. Bibcode:2005AJ....129.1483L. doi:10.1086/427854. S2CID 2603568.

[mccook2006-3] McCook, G. P.; Sion, E. M. (2014). "Entry for WD 0642-166". The VizieR database of astronomical catalogues. CDS.

[torres2021-4] 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. arXiv:2101.03341. Bibcode:2021MNRAS.502.1753T. doi:10.1093/mnras/stab079.

[newTemp-5] "12-Billion-Year-Old White-Dwarf Stars Only 100 Light-Years Away". Space Daily. April 26, 2012.

[simbad-6] "WD 0343+247". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 5, 2007.

[7] 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.

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Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Taurus
Right ascension	03^h 46^m 46.517^s^[1]
Declination	+24° 56′ 02.67″^[1]
Apparent magnitude (V)	19.0^[2]
Characteristics
Evolutionary stage	white dwarf
Spectral type	DX13^[3]
U−B color index	+0.30^[2]
B−V color index	+1.44^[2]
Astrometry

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 (M_V)	16.80^[3]

Details

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

Other designations
WD 0343+247, EQ J0346+249,^[6] J0346+2455^[4]
Database references
SIMBAD	data

WD 0343+247

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