Astronomy:Gliese 318
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Short description: White dwarf in the constellation Pyxis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Pyxis |
| Right ascension | 08h 41m 32.42908s[1] |
| Declination | –32° 56′ 32.9158″[1] |
| Apparent magnitude (V) | 11.85[2] |
| Characteristics | |
| Spectral type | DA5.5 |
| U−B color index | −0.59[3] |
| B−V color index | +0.25[4] |
| Astrometry | |
| Radial velocity (Rv) | +29.3 ± 2.9 km/s |
| Proper motion (μ) | RA: –1061.158[1] mas/yr Dec.: 1345.900[1] mas/yr |
| Parallax (π) | 117.3961 ± 0.0205[1] mas |
| Distance | 27.783 ± 0.005 ly (8.518 ± 0.001 pc) |
| Absolute magnitude (MV) | 12.14 ± 0.05[5] |
| Details | |
| Mass | 0.45 ± 0.01[5] M☉ |
| Luminosity | 0.0015[5] L☉ |
| Temperature | 9120 ± 190[5] K |
| Age | 550 ± 20 million[5] years |
| Other designations | |
GJ 318, CD−32° 5613, LHS 253, L 532-81, LTT 3218, WD 0839-327 | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
Gliese 318 is a white dwarf in the constellation Pyxis. Its spectral type is DA5.5 and it has a visual magnitude of 11.85,[2] and lies 27.8 light-years (8.5 parsecs) away.[6] The star was too faint to have had its parallax measured by the Hipparcos satellite. Earth-based measurement in 2009 gave its parallax as 113.63 ± 1.97 milliarcseconds, yielding a distance of 28.7 ± 0.5 light-years;[5] this parallax measurement has since been substantially improved by Gaia. It is around 45% as massive as the Sun but has only 0.15% its luminosity.[5]
Bragaglia et al. suspect this star to be a double white dwarf due to strong spectral line variations.[7] From Gaia DR2 it was not possible to confirm this claim. It is still possible that Gliese 318 is a double white dwarf and additional spectroscopic observations are needed in order to confirm this claim.[8] Gliese 318 could be the closest double white dwarf to earth.[9][10]
References
- ↑ 1.0 1.1 1.2 1.3 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.
- ↑ 2.0 2.1 Pancino, E.; Altavilla, G.; Marinoni, S.; Cocozza, G.; Carrasco, J. M.; Bellazzini, M.; Bragaglia, A.; Federici, L. et al. (2012). "The Gaia spectrophotometric standard stars survey - I. Preliminary results". Monthly Notices of the Royal Astronomical Society 426 (3): 1767–81. doi:10.1111/j.1365-2966.2012.21766.x. Bibcode: 2012MNRAS.426.1767P.
- ↑ Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E. et al. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues 2246: II/246. Bibcode: 2003yCat.2246....0C. http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=II/246.
- ↑ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 Subasavage, John P.; Jao, Wei-Chun; Henry, Todd J.; Bergeron, P.; Dufour, P.; Ianna, Philip A.; Costa, Edgardo; Méndez, René A. (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): 4547–60. doi:10.1088/0004-6256/137/6/4547. Bibcode: 2009AJ....137.4547S.
- ↑ Sion, Edward M. (2009). "1.The White Dwarfs Within 20 Parsecs of the Sun: Kinematics and Statistics". The Astronomical Journal 138 (6): 1681. doi:10.1088/0004-6256/138/6/1681. Bibcode: 2009AJ....138.1681S.
- ↑ Bragaglia, Angela; Greggio, Laura; Renzini, Alvio; D'Odorico, Sandro (1990-12-01). "Double Degenerates among DA White Dwarfs". The Astrophysical Journal 365: L13. doi:10.1086/185877. ISSN 0004-637X. Bibcode: 1990ApJ...365L..13B. https://ui.adsabs.harvard.edu/abs/1990ApJ...365L..13B.
- ↑ Hollands, M. A.; Tremblay, P. -E.; Gänsicke, B. T.; Gentile-Fusillo, N. P.; Toonen, S. (2018-11-01). "The Gaia 20 pc white dwarf sample". Monthly Notices of the Royal Astronomical Society 480 (3): 3942–3961. doi:10.1093/mnras/sty2057. ISSN 0035-8711. Bibcode: 2018MNRAS.480.3942H. https://ui.adsabs.harvard.edu/abs/2018MNRAS.480.3942H.
- ↑ Toonen, S.; Hollands, M.; Gänsicke, B. T.; Boekholt, T. (2017-06-01). "The binarity of the local white dwarf population". Astronomy and Astrophysics 602: A16. doi:10.1051/0004-6361/201629978. ISSN 0004-6361. Bibcode: 2017A&A...602A..16T.
- ↑ Bagnulo, S.; Landstreet, J. D. (2021-11-01). "New insight into the magnetism of degenerate stars from the analysis of a volume-limited sample of white dwarfs". Monthly Notices of the Royal Astronomical Society 507 (4): 5902–5951. doi:10.1093/mnras/stab2046. ISSN 0035-8711. Bibcode: 2021MNRAS.507.5902B. https://ui.adsabs.harvard.edu/abs/2021MNRAS.507.5902B.
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