WD 1337 705

WD 1337+705
Observation data; Epoch J2000 Equinox J2000
Constellation	Ursa Minor
Right ascension	13h 38m 50.4781s
Declination	+70° 17′ 07.6414″
Apparent magnitude (V)	12.773
Characteristics
Spectral type	DA2.4
Astrometry
Proper motion (μ)	RA: −402.093 ± 0.078 mas/yr ; Dec.: −24.608 ± 0.068 mas/yr
Parallax (π)	37.7083 ± 0.0422 mas
Distance	86.49 ± 0.10 ly ; (26.52 ± 0.03 pc)
Absolute magnitude (MV)	10.56
Details
Mass	0.59 M☉
Luminosity	0.03 L☉
Temperature	21290 K K
Other designations
	WD 1337+705, EG 102, HIP 66578, LTT 18341
Database references
SIMBAD	data

WD 1337+705 is a star in the constellation Ursa Minor. Shining with an apparent magnitude of 12.8, it is white dwarf 0.59 times as massive as the Sun.^[2] It is 86.5 light-years distant from Earth.^[1] It has 3% of the Sun's luminosity.^[3]

In 1997, Jay Holberg and colleagues discovered magnesium in its spectrum, which suggests that it has some low mass companion or accretion of material happening as the star's temperature is not hot enough for its intrinsic emission.^[4] Despite this, no direct evidence for a circumstellar disc, such as an infrared excess, has come to light.^[5]

References

^ ^a ^b ^c ^d ^e ^f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^a ^b ^c ^d ^e Gianninas, A.; Bergeron, P.; Ruiz, M. T. (2011). "A Spectroscopic Survey and Analysis of Bright, Hydrogen-rich White Dwarfs". The Astrophysical Journal. 743 (2): 27. arXiv:1109.3171. Bibcode:2011ApJ...743..138G. doi:10.1088/0004-637X/743/2/138. S2CID 119210906. 138.
^ ^a ^b Bannister, N. P.; Barstow, M. A.; Holberg, J. B.; Bruhweiler, F. C. (2003). "Circumstellar features in hot DA white dwarfs". Monthly Notices of the Royal Astronomical Society. 341 (2): 477–95. arXiv:astro-ph/0301204. Bibcode:2003MNRAS.341..477B. doi:10.1046/j.1365-8711.2003.06409.x. S2CID 122754617.
^ Holberg, Jay; Barstow, M.A.; Green, Elizabeth M. (1997). "The Discovery of Mg II λ4481 in the White Dwarf EG 102: Evidence for Ongoing Accretion". The Astrophysical Journal. 474 (2): L127–L130. Bibcode:1997ApJ...474L.127H. doi:10.1086/310446.
^ Dickinson, N. J.; Barstow, M. A.; Welsh, B. Y.; Burleigh, M.; Farihi, J.; Redfield, S.; Unglaub, K. (2012). "The origin of hot white dwarf circumstellar features". Monthly Notices of the Royal Astronomical Society. 423 (2): 1397–1410. arXiv:1203.5226. Bibcode:2012MNRAS.423.1397D. doi:10.1111/j.1365-2966.2012.20964.x. S2CID 119212643.

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[Gaia_DR2-1] ^ ^a ^b ^c ^d ^e ^f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.

[Gianninas_2011-2] Gianninas, A.; Bergeron, P.; Ruiz, M. T. (2011). "A Spectroscopic Survey and Analysis of Bright, Hydrogen-rich White Dwarfs". The Astrophysical Journal. 743 (2): 27. arXiv:1109.3171. Bibcode:2011ApJ...743..138G. doi:10.1088/0004-637X/743/2/138. S2CID 119210906. 138.

[bannister-3] Bannister, N. P.; Barstow, M. A.; Holberg, J. B.; Bruhweiler, F. C. (2003). "Circumstellar features in hot DA white dwarfs". Monthly Notices of the Royal Astronomical Society. 341 (2): 477–95. arXiv:astro-ph/0301204. Bibcode:2003MNRAS.341..477B. doi:10.1046/j.1365-8711.2003.06409.x. S2CID 122754617.

[4] Holberg, Jay; Barstow, M.A.; Green, Elizabeth M. (1997). "The Discovery of Mg II λ4481 in the White Dwarf EG 102: Evidence for Ongoing Accretion". The Astrophysical Journal. 474 (2): L127–L130. Bibcode:1997ApJ...474L.127H. doi:10.1086/310446.

[5] Dickinson, N. J.; Barstow, M. A.; Welsh, B. Y.; Burleigh, M.; Farihi, J.; Redfield, S.; Unglaub, K. (2012). "The origin of hot white dwarf circumstellar features". Monthly Notices of the Royal Astronomical Society. 423 (2): 1397–1410. arXiv:1203.5226. Bibcode:2012MNRAS.423.1397D. doi:10.1111/j.1365-2966.2012.20964.x. S2CID 119212643.

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Observation data Epoch J2000 Equinox J2000
Constellation	Ursa Minor
Right ascension	13^h 38^m 50.4781^s^[1]
Declination	+70° 17′ 07.6414″^[1]
Apparent magnitude (V)	12.773
Characteristics
Spectral type	DA2.4^[2]
Astrometry

Proper motion (μ)	RA: −402.093 ± 0.078^[1] mas/yr Dec.: −24.608 ± 0.068^[1] mas/yr
Parallax (π)	37.7083 ± 0.0422 mas^[1]
Distance	86.49 ± 0.10 ly (26.52 ± 0.03 pc)
Absolute magnitude (M_V)	10.56^[2]

Details

Mass	0.59^[2] `M`_☉
Luminosity	0.03^[3] `L`_☉
Temperature	21290 K^[2] K

Other designations
WD 1337+705, EG 102, HIP 66578, LTT 18341
Database references
SIMBAD	data