L 97-12

L 97-12 (or WD 0752-676, or LHS 34, or Gliese 293) is a nearby degenerate star (white dwarf), located in the constellation Volans, the single known component of the system.

L 97-12
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Volans
Right ascension 07h 53m 08.1440s[1]
Declination −67° 47′ 31.3806″[1]
Apparent magnitude (V) 13.96[2]
Characteristics
Spectral type DC8.8,[3] or DC10.3[4]
Apparent magnitude (B) 14.75[5]
Apparent magnitude (V) 13.96[2]
Apparent magnitude (RKC) 13.58[2]
Apparent magnitude (IKC) 13.20[2]
Apparent magnitude (J) 12.726 ± 0.023[5]
Apparent magnitude (H) 12.476 ± 0.026[5]
Apparent magnitude (KS) 12.362 ± 0.024[5]
Astrometry
Proper motion (μ) RA: 1467.066±0.030[1] mas/yr
Dec.: −1489.828±0.034[1] mas/yr
Parallax (π)122.3653 ± 0.0142[1] mas
Distance26.654 ± 0.003 ly
(8.1723 ± 0.0009 pc)
Absolute magnitude (MV)14.47 ± 0.04[2]
Details
Mass0.59 ± 0.01[2] M☉
Radius0.0128[2][note 1] R☉
Surface gravity (log g)8.00 ± 0.02[2] cgs
Temperature5700 ± 90[2] K
Age2.65 ± 0.10[2][note 2] Gyr
Other designations
Gliese 293, LHS 34, LFT 555, LTT 2981, L 97-12,[6] WD 0752-676, EGGR 56, 2MASS J07530814-6747314[5]
Database references
SIMBADdata

Distance

Possibly, L 97-12 is the ninth-closest white dwarf after Sirius B, Procyon B, van Maanen's star, Gliese 440, 40 Eridani B, Stein 2051 B, GJ 1221 and Gliese 223.2. (However, there is probability, that white dwarfs GJ 1087,[6] Gliese 518[6] and (with lesser probability) Gliese 915[2] may be located closer.) Trigonometric parallax of L 97-12 was included in the YPC (Yale Parallax Catalog), and subsequently it was measured more precisely in CTIOPI (Cerro Tololo Inter-American Observatory (CTIO) Parallax Investigation) 0.9 m telescope program:

L 97-12 parallax measurements
SourcePaperParallax, masDistance, pcDistance, lyRef.
YPCvan Altena et al., 1995141.2 ± 8.47.08 ± 0.4223.10 ± 1.37[6]
CTIOPI 0.9 mTSN-21 (Subasavage et al., 2009)126.25 ± 1.347.92 ± 0.0825.83 ± 0.27[2]

Physical parameters

The mass of L 97-12 is 0.59 ± 0.01 Solar masses,[2] and its surface gravity is 108.00 ± 0.02 cm·s−2,[2] or approximately 102,000 of Earth's, corresponding to a radius of 8,887 kilometres (5,522 miles), or 139% of Earth's.

L 97-12 has temperature 5,700 ± 90 K,[2] almost like the Sun, and cooling age, i.e. age as degenerate star (not including lifetime as main-sequence star and as giant star) 2.65 ± 0.10 Gyr.[2] Despite it is classified as "white dwarf", it should appear yellow, not white, nearly the same color as the Sun.

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. 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.
  2. Subasavage, John P.; Jao; Henry; Bergeron; Dufour; Ianna; Costa; Mendez (2009). "THE SOLAR NEIGHBORHOOD. XXI. PARALLAX RESULTS FROM THE CTIOPI 0.9 m PROGRAM: 20 NEW MEMBERS OF THE 25 PARSEC WHITE DWARF SAMPLE". The Astronomical Journal. 137 (6): 4547–4560. arXiv:0902.0627. Bibcode:2009AJ....134.4547S. doi:10.1088/0004-6256/137/6/4547. S2CID 14696597.
  3. 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.
  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. arXiv:0910.1288. Bibcode:2009AJ....138.1681S. doi:10.1088/0004-6256/138/6/1681. S2CID 119284418.
  5. "GJ 293 -- White Dwarf". Centre de Données astronomiques de Strasbourg. Retrieved 2011-10-30.
  6. Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995)
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