Astronomy:Gamma Indi
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Indus[1] |
| Right ascension | 21h 26m 15.43919s[2] |
| Declination | −54° 39′ 37.6516″[2] |
| Apparent magnitude (V) | 6.09±0.01[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2][4] |
| Spectral type | F1III[5] |
| Astrometry | |
| Radial velocity (Rv) | +10.4±0.6[6] km/s |
| Proper motion (μ) | RA: +1.040[2] mas/yr Dec.: +39.036[2] mas/yr |
| Parallax (π) | 15.1909 ± 0.0250[2] mas |
| Distance | 214.7 ± 0.4 ly (65.8 ± 0.1 pc) |
| Absolute magnitude (MV) | +1.98[1] |
| Details | |
| Mass | 1.72[7] M☉ |
| Radius | 2.47[8] R☉ |
| Luminosity | 12.5[8] L☉ |
| Surface gravity (log g) | 3.85[2] cgs |
| Temperature | 6,912[8] K |
| Metallicity [Fe/H] | −0.09[7] dex |
| Age | 1.40[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Gamma Indi is a star in the constellation Indus. Its apparent magnitude is 6.09, much fainter than Delta Indi and unusually faint for a Gamma-labelled star, making it only visible from very dark skies in ideal conditions. Parallax measurements imply a distance of 65.8 parsecs (215 ly). The star is moving away with an heliocentric velocity of +10.4 km/s.
The spectrum of this star matches a spectral class of F1III,[5] with the luminosity class III suggesting it is a giant star that has exhausted the hydrogen at its core. However, stellar evolution models imply that it is not a giant star, but is still on the main sequence.[2] Around 1.72 times the mass of the Sun and 1.40 billion years old,[7] Gamma Indi is nearly 13 times as luminous as the Sun, with a radius 2.47 times larger. All this energy is released from its photosphere shining at an effective temperature of 6,912 K,[8] giving it the yellow-white hue typical of F-type stars.[10]
References
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 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.
- ↑ Paunzen, E. (2015-08-01). "A new catalogue of Strömgren-Crawford uvbyβ photometry". Astronomy and Astrophysics 580: A23. doi:10.1051/0004-6361/201526413. ISSN 0004-6361. Bibcode: 2015A&A...580A..23P.
- ↑ Chandler, Colin Orion; McDonald, Iain; Kane, Stephen R. (2016). "The Catalog of Earth-Like Exoplanet Survey Targets (CELESTA): A Database of Habitable Zones Around Nearby Stars". The Astronomical Journal 151 (3): 59. doi:10.3847/0004-6256/151/3/59. Bibcode: 2016AJ....151...59C.
- ↑ 5.0 5.1 Malaroda, S. (August 1975). "Study of the F-type 1 MK spectral types." (in en). The Astronomical Journal 80: 637. doi:10.1086/111786. ISSN 0004-6256.
- ↑ Gontcharov, G. A. (2006-11-01). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system" (in en). Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. ISSN 1562-6873. Bibcode: 2006AstL...32..759G.
- ↑ 7.0 7.1 7.2 7.3 Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (June 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s): Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy & Astrophysics 530: A138. doi:10.1051/0004-6361/201016276. ISSN 0004-6361. Bibcode: 2011A&A...530A.138C.
- ↑ 8.0 8.1 8.2 8.3 Schofield, Mathew; Chaplin, William J.; Huber, Daniel; Campante, Tiago L.; Davies, Guy R.; Miglio, Andrea; Ball, Warrick H.; Appourchaux, Thierry et al. (2019-03-01). "The Asteroseismic Target List for Solar-like Oscillators Observed in 2 minute Cadence with the Transiting Exoplanet Survey Satellite" (in en). The Astrophysical Journal Supplement Series 241 (1): 12. doi:10.3847/1538-4365/ab04f5. ISSN 0067-0049. Bibcode: 2019ApJS..241...12S.
- ↑ "gam Ind". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=gam+Ind.
- ↑ "The Colour of Stars". Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html. Retrieved 2012-01-16.
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