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G 99-47

Coordinates: Sky map 05h 56m 25.47s, +05° 21′ 48.6″
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G 99-47

A visual band light curve for V1201 Orionis, adapted from Brinkworth et al. (2013)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 05h 56m 25.45999s[2]
Declination +05° 21′ 48.4432″[2]
Apparent magnitude (V) 14.105[3]
Characteristics
Spectral type DAP8.9[4]
Apparent magnitude (B) 14.69[5]
Apparent magnitude (V) 14.10[5]
Apparent magnitude (R) 14.0[5]
Apparent magnitude (I) 13.6[5]
Apparent magnitude (J) 12.930 ± 0.022[5]
Apparent magnitude (H) 12.720 ± 0.025[5]
Apparent magnitude (K) 12.653 ± 0.024[5]
Astrometry
Radial velocity (Rv)−414.02±10.41[2] km/s
Proper motion (μ) RA: -444.685 mas/yr[2]
Dec.: -925.140 mas/yr[2]
Parallax (π)123.1989±0.0170 mas[2]
Distance26.474 ± 0.004 ly
(8.117 ± 0.001 pc)
Absolute magnitude (MV)14.59[3][6][note 1]
Details
Mass0.71 ± 0.03[3] M☉
Radius0.011[3][note 2] R☉
Surface gravity (log g)8.20 ± 0.05[3] cgs
Temperature5790 ± 110[3] K
Age3.97[4][note 3] Gyr
Other designations
V1201 Ori, GJ 1087, EGGR 290, G 99-47, G 102-40, G 106-15, LHS 212, LTT 17891, NLTT 15834, WD 0553+053, 2MASS J05562547+0521486, USNO-B1.0 0953-00073703[5]
Database references
SIMBADdata

G 99-47 (V1201 Orionis) is a nearby degenerate star (white dwarf) of spectral class DAP8 (DAP8.9,[4] or DAP8.7[3]), the single known component of the system, located in the constellation Orion. G 99-47 is the 10th-closest known white dwarf, the next closest after LP 658-2 and GJ 3991 B.[7]

The mass of G 99-47 is 0.71±0.03 Solar masses;[3] its surface gravity is 108.20 ± 0.05 (1.58 · 108) cm·s−2,[3] or approximately 162 000 of Earth's, corresponding to a radius 7711 km, or 121% of Earth's. Its temperature is 5790 ± 110 K,[3] almost like the Sun's; its cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star) is 3.97 Gyr.[4] Due almost equal to the Sun's temperature, GJ 1087 should appear almost the same white color as the Sun. The white dwarf has a strong magnetic field, with measured vertical component near surface equal to 560 T.[8]

See also

[edit]

Notes

[edit]
  1. ^ From apparent magnitude and parallax.
  2. ^ From surface gravity and mass.
  3. ^ White dwarf cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star)

References

[edit]
  1. ^ Brinkworth, Carolyn S.; Burleigh, Matthew R.; Lawrie, Katherine; Marsh, Thomas R.; Knigge, Christian (August 2013). "Measuring the Rotational Periods of Isolated Magnetic White Dwarfs". The Astrophysical Journal. 773 (1): 47. Bibcode:2013ApJ...773...47B. doi:10.1088/0004-637X/773/1/47. hdl:2381/37593. S2CID 56285149.
  2. ^ 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.
  3. ^ a b c d e f g h i j Holberg, J. B.; Sion; Oswalt; McCook; Foran; Subasavage (2008). "A New Look at the Local White Dwarf Population". The Astronomical Journal. 135 (4): 1225–1238. Bibcode:2008AJ....135.1225H. doi:10.1088/0004-6256/135/4/1225. S2CID 122855486.
  4. ^ a b c d Sion, Edward M.; Holberg; Oswalt; McCook; Wasatonic (2009). "The White Dwarfs within 20 Parsecs of the Sun: Kinematics and Statistics". The Astronomical Journal. 138 (6): 1681–1689. arXiv:0910.1288. Bibcode:2009AJ....138.1681S. doi:10.1088/0004-6256/138/6/1681. S2CID 119284418.
  5. ^ a b c d e f g h "V* V1201 Ori -- White Dwarf". Centre de Données astronomiques de Strasbourg. Retrieved 2011-11-01.
  6. ^ Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995)
  7. ^ Reylé, Céline; Jardine, Kevin; Fouqué, Pascal; Caballero, Jose A.; Smart, Richard L.; Sozzetti, Alessandro (30 April 2021). "The 10 parsec sample in the Gaia era". Astronomy & Astrophysics. 650: A201. arXiv:2104.14972. Bibcode:2021A&A...650A.201R. doi:10.1051/0004-6361/202140985. S2CID 233476431. Data available at https://gruze.org/10pc/ Archived 12 March 2023 at the Wayback Machine
  8. ^ Bagnulo, Stefano; Landstreet, John D. (2020), "Discovery of six new strongly magnetic white dwarfs in the 20 pc local population", Astronomy & Astrophysics, 643: A134, arXiv:2010.05795, Bibcode:2020A&A...643A.134B, doi:10.1051/0004-6361/202038565, S2CID 222290583
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