Astronomy:36 G. Doradus
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Dorado |
| Right ascension | 05h 54m 06.05459s[1] |
| Declination | −63° 05′ 23.2090″[1] |
| Apparent magnitude (V) | 4.65[2] |
| Characteristics | |
| Spectral type | K2 III[3] |
| B−V color index | 1.022±0.045[2] |
| Astrometry | |
| Radial velocity (Rv) | +25.1±0.8[2] km/s |
| Proper motion (μ) | RA: +148.129[1] mas/yr Dec.: +550.143[1] mas/yr |
| Parallax (π) | 36.5981 ± 0.0924[1] mas |
| Distance | 89.1 ± 0.2 ly (27.32 ± 0.07 pc) |
| Absolute magnitude (MV) | 2.56[2] |
| Details[4] | |
| Mass | 1.28±0.03[5] M☉ |
| Radius | 4.76±0.14 R☉ |
| Luminosity | 9.68±0.40[5] L☉ |
| Surface gravity (log g) | 3.020±0.155 cgs |
| Temperature | 4,807±62 K |
| Metallicity [Fe/H] | +0.141±0.035 dex |
| Age | 7.91[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
36 G. Doradus (HD 40409) is a suspected astrometric binary[8] star system in the southern constellation of Dorado. It is a faint system but visible to the naked eye with an apparent visual magnitude of 4.65.[2] Based upon an annual parallax shift of 36.60 mas,[1] it is located 89 light years away from the Sun. It is moving further away with a heliocentric radial velocity of +25 km/s.[2] The system has a relatively high proper motion, traversing the celestial sphere at the rate of 0.57 arcseconds per year along a position angle of 14.51°.[9]
Based on the stellar classification of K2 III assigned by Gray et al. (2006),[3] the visible component is a K-type giant star. In contrast, Keenan and McNeil (1989) gave it a somewhat less evolved classification of K2 III–IV.[10] It is about eight billion years old[6] with 28% more mass than the Sun,[5] and has expanded to 4.76 times the Sun's radius. The star is radiating 10[5] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,807 K.[4]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Gray, R. O. et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal 132 (1): 161–170, doi:10.1086/504637, Bibcode: 2006AJ....132..161G.
- ↑ 4.0 4.1 Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V. et al. (2022-01-01), "CORALIE radial-velocity search for companions around evolved stars (CASCADES). I. Sample definition and first results: Three new planets orbiting giant stars", Astronomy and Astrophysics 657: A87, doi:10.1051/0004-6361/202040078, ISSN 0004-6361, Bibcode: 2022A&A...657A..87O. 36 G. Doradus' database entry at VizieR.
- ↑ 5.0 5.1 5.2 5.3 Malla, Sai Prathyusha; Stello, Dennis; Montet, Benjamin T; Huber, Daniel; Hon, Marc; Bedding, Timothy R; Reyes, Claudia; Hey, Daniel R (2024-11-01), "Benchmarking the spectroscopic masses of 249 evolved stars using asteroseismology with TESS", Monthly Notices of the Royal Astronomical Society 534 (3): 1775–1786, doi:10.1093/mnras/stae2179, ISSN 0035-8711, Bibcode: 2024MNRAS.534.1775M.
- ↑ 6.0 6.1 Wittenmyer, Robert A.; Liu, Fan; Wang, Liang; Casagrande, Luca; Johnson, John Asher; Tinney, C. G. (July 2016), "The Pan-Pacific Planet Search. V. Fundamental Parameters for 164 Evolved Stars", The Astronomical Journal 152 (1): 15, doi:10.3847/0004-6256/152/1/19, 19, Bibcode: 2016AJ....152...19W.
- ↑ "HD 40409". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+40409.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Bakos, Gáspár Á. et al. (July 2002), "Revised Coordinates and Proper Motions of the Stars in the Luyten Half-Second Catalog", The Astrophysical Journal Supplement Series 141 (1): 187–193, doi:10.1086/340115, Bibcode: 2002ApJS..141..187B.
- ↑ Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
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