L 97-12
Coordinates: 07h 53m 08.15s, −67° 47′ 31.4″
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Volans |
Right ascension | 07h 53m 08.15s[1] |
Declination | −67° 47′ 31.4″[1] |
Apparent magnitude (V) | 13.96[2] |
Characteristics | |
Spectral type | DC8.8,[3] or DC10.3[4] |
Apparent magnitude (B) | 14.75[1] |
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[1] |
Apparent magnitude (H) | 12.476 ± 0.026[1] |
Apparent magnitude (KS) | 12.362 ± 0.024[1] |
Astrometry | |
Proper motion (μ) | RA: 1462[2] mas/yr Dec.: −1504[2] mas/yr |
Parallax (π) | 126.25 ± 1.34[2] mas |
Distance | 25.8 ± 0.3 ly (7.92 ± 0.08 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 (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.
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,[5] Gliese 518[5] 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 | [5] |
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
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
- ↑ From surface gravity and mass.
- ↑ 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 2 3 4 5 6 7 "GJ 293 -- White Dwarf". Centre de Données astronomiques de Strasbourg. Retrieved 2011-10-30.
- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 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: 4547–4560. Bibcode:2009AJ....134.4547S. doi:10.1088/0004-6256/137/6/4547.
- ↑ Holberg, J. B.; Sion; Oswalt; McCook; Foran; Subasavage (2008). "A NEW LOOK AT THE LOCAL WHITE DWARF POPULATION". The Astronomical Journal. 135: 1225–1238. Bibcode:2008AJ....135.1225H. doi:10.1088/0004-6256/135/4/1225.
- ↑ Sion, Edward M.; Holberg; Oswalt; McCook; Wasatonic (2009). "THE WHITE DWARFS WITHIN 20 PARSECS OF THE SUN: KINEMATICS AND STATISTICS". The Astronomical Journal. 138: 1681–1689. arXiv:0910.1288. Bibcode:2009AJ....138.1681S. doi:10.1088/0004-6256/138/6/1681.
- 1 2 3 4 Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995)