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.
| 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) | 122.4130 ± 0.0114 mas[6] |
| Distance | 26.644 ± 0.002 ly (8.1691 ± 0.0008 pc) |
| Absolute magnitude (MV) | 14.47 ± 0.04[2] |
| Details | |
| Mass | 0.59 ± 0.01[2] M☉ |
| Radius | 0.0128[2][note 1] R☉ |
| Surface gravity (log g) | 8.00 ± 0.02[2] cgs |
| Temperature | 5700 ± 90[2] K |
| Age | 2.65 ± 0.10[2][note 2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
  L 97-12 Location of L 97-12 in the constellation Volans | |
Distance
editPossibly, 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,[7] Gliese 518[7] 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:
| Source | Paper | Parallax, mas | Distance, pc | Distance, ly | Ref. |
|---|---|---|---|---|---|
| YPC | van Altena et al., 1995 | 141.2 ± 8.4 | 7.08 ± 0.42 | 23.10 ± 1.37 | [7] |
| CTIOPI 0.9 m | TSN-21 (Subasavage et al., 2009) | 126.25 ± 1.34 | 7.92 ± 0.08 | 25.83 ± 0.27 | [2] |
Physical parameters
editThe 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] It has a white appearance due to similar temperature to Sun.
See also
editNotes
editReferences
edit- ^ a b c d 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 f g h i j k l m n o p 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....137.4547S. doi:10.1088/0004-6256/137/6/4547. S2CID 14696597.
- ^ 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.
- ^ 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.
- ^ a b c d e "GJ 293 -- White Dwarf". Centre de Données astronomiques de Strasbourg. Retrieved 2011-10-30.
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b c d Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995)