Astronomy:Wolf 489

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Short description: Star in the constellation Virgo

Coordinates: Sky map 13h 36m 31.81s, +03° 40′ 45.9″

Wolf 489
Observation data
Equinox J2000.0]] (ICRS)
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[2] mas
Distance27.235 ± 0.007 ly
(8.350 ± 0.002 pc)
Absolute magnitude (MV)15.04[4]
Details
Mass0.55±0.03[3] M☉
Radius0.013[3][note 1] R☉
Luminosity0.000095[4] L☉
Surface gravity (log g)7.95±0.02[3] cgs
Temperature5,030±120[3] K
Age5.19[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
SIMBADdata

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.

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
Source Parallax, mas Distance, pc Distance, ly
Woolley (1970)[8] 135±12 7.4±0.7 24.2±2.1
GJ, 3rd version[9] 122.2±3.9 8.18±0.26 26.69±0.85
YPC, 4th edition[7] 121.4±3.4 8.24±0.23 26.87±0.75
Gaia DR3, 2023[2] 119.7566±0.0304 8.3503±0.0002 27.235±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 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. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 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. doi:10.1088/0004-6256/135/4/1225. Bibcode: 2008AJ....135.1225H. https://commons.erau.edu/cgi/viewcontent.cgi?article=1948&context=publication. 
  4. ↑ 4.0 4.1 4.2 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. doi:10.1088/0067-0049/219/2/19. Bibcode: 2015ApJS..219...19L. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 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. doi:10.1088/0004-6256/138/6/1681. Bibcode: 2009AJ....138.1681S. 
  6. ↑ 6.00 6.01 6.02 6.03 6.04 6.05 6.06 6.07 6.08 6.09 6.10 6.11 6.12 6.13 6.14 6.15 6.16 "GJ 518 -- White Dwarf". Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Gliese+518. 
  7. ↑ 7.0 7.1 7.2 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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