Wolf 489

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Wolf 489
Observation data
Epoch J2000        Equinox J2000
Constellation Virgo [1]
Right ascension 13h 36m 31.85s [2]
Declination +03° 40′ 45.9″ [2]
Apparent magnitude  (V)14.66 [3]
Characteristics
Evolutionary stage white dwarf [4]
Spectral type DZ10.0 [3] [5]
Apparent magnitude  (B)15.59 [6]
Apparent magnitude  (V)14.63 [6]
Apparent magnitude  (R)14.0 [6]
Apparent magnitude  (I)14.1 [6]
Apparent magnitude  (J)13.06 [6]
Apparent magnitude  (H)12.82 [6]
Apparent magnitude  (K)12.69 [6]
Astrometry
Proper motion (μ)RA: −3735.839 [2] mas/yr
Dec.: −1113.581 [2] mas/yr
Parallax (π)119.7566±0.0304  mas [2]
Distance 27.235 ± 0.007  ly
(8.350 ± 0.002  pc)
Absolute magnitude  (MV)15.04 [4]
Details
Mass 0.55±0.03 [3]   M☉
Radius 0.013 [3] [note 1]   R☉
Luminosity 0.000095 [4]   L☉
Surface gravity (log g)7.95±0.02 [3]   cgs
Temperature 5,030±120 [3]   K
Age 5.19 [5] [note 2]   Gyr
Other designations
WD 1334+039, [3] [5] Wolf  489, [6] Gliese  518, [6] LHS  46, [3] LFT  1023, [6] LTT  13961, [6] NLTT  34618, [6] G  062-053, [7] G  62-53, [6] G  64-4, [6] EGGR 100, [6] 2MASS  J13363181+0340458, [6] USNO-B1.0 0936-00229354 [6]
Database references
SIMBAD data

Wolf 489 (WD 1334+039, LHS 46, G 062-053, Gliese 518) is a nearby degenerate star (white dwarf) of spectral class DZ10.0 [3] [5] ), the single known component of the system, located in the constellation Virgo.

Contents

Distance

Wolf 489, probably, is the 12th closest white dwarf, or, possibly, 9th–14th (see Gliese 293, GJ 1087, Gliese 915, GJ 1276 and Gliese 318). Its trigonometric parallax from YPC (Yale Parallax Catalog) is 121.4 ± 3.4 mas, corresponding to a distance 8.24 ± 0.23 pc, or 26.87 ± 0.75 ly. [7]

Wolf 489 parallax data
SourceParallax, mas Distance, pc Distance, ly
Woolley (1970) [8] 135±127.4±0.724.2±2.1
GJ, 3rd version [9] 122.2±3.98.18±0.2626.69±0.85
YPC, 4th edition [7] 121.4±3.48.24±0.2326.87±0.75
Gaia DR3, 2023 [2] 119.7566±0.03048.3503±0.000227.235±0.007

Physical parameters

Wolf 489's mass is 0.55 ± 0.03 Solar masses, [3] its surface gravity is 107.95 ± 0.02 (8.91 · 107) cm·s−2, [3] or approximately 91 000 of Earth's, corresponding to a radius 9089 km, or 143% of Earth's.

Wolf 489's temperature is 5030 ± 120 K [3] (comparable with that of early K-type main sequence stars); its cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star) is 5.19 Gyr. [5] Wolf 489 and should appear white with a slight shade of yellow, nearly the same color as a K-type main sequence star.

Notes

  1. ↑ From surface gravity and mass.
  2. ↑ White dwarf cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star)

See also

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific . 99 (617): 695. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR.
  2. 1 2 3 4 5 6 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. 1 2 3 4 5 6 7 8 9 10 11 12 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. 1 2 3 Limoges, M. -M.; Bergeron, P.; Lépine, S. (2015). "Physical Properties of the Current Census of Northern White Dwarfs within 40 pc of the Sun". The Astrophysical Journal Supplement Series. 219 (2): 19. arXiv: 1505.02297 . Bibcode:2015ApJS..219...19L. doi:10.1088/0067-0049/219/2/19.
  5. 1 2 3 4 5 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.
  6. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 "GJ 518 -- White Dwarf". Centre de Données astronomiques de Strasbourg . Retrieved 2011-11-02.
  7. 1 2 3 Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995)
  8. ↑ Stars within 25 pc of the Sun (Woolley+ 1970)
  9. ↑ Nearby Stars, Preliminary 3rd Version (Gliese+ 1991)
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