Astronomy:Theta Indi
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Short description: Star in the constellation Indus
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Indus |
| Right ascension | 21h 19m 51.98955s[1] |
| Declination | −53° 26′ 57.9315″[1] |
| Apparent magnitude (V) | 4.40[2] |
| Characteristics | |
| Spectral type | A5IV-V[3] |
| B−V color index | +0.18[2] |
| Astrometry | |
| Radial velocity (Rv) | −14.50[4] km/s |
| Proper motion (μ) | RA: +107.90[1] mas/yr Dec.: −66.41[1] mas/yr |
| Parallax (π) | 33.02 ± 0.49[1] mas |
| Distance | 99 ± 1 ly (30.3 ± 0.4 pc) |
| Absolute magnitude (MV) | 1.98[5] |
| Details | |
| Mass | 1.75[6] M☉ |
| Radius | 1.61[7] R☉ |
| Luminosity | 12.95[8] L☉ |
| Temperature | 8,332[6] K |
| Rotational velocity (v sin i) | 135[7] km/s |
| Age | 150±100[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Theta Indi (θ Ind) is a binary star in the constellation Indus. Its apparent magnitude is 4.40[2] and it is approximately 98.8 light years away based on parallax.[1] The smaller companion, B, has a spectral type of G0V (yellow main-sequence) and an apparent magnitude of 7.18 at a separation of 6.71″.[9] Recent observations suggest the primary is itself a binary with components Aa and Ab orbiting at 0.0617″, estimated period about 1.3 years.[10][11]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. http://www.aanda.org/articles/aa/full/2007/41/aa8357-07/aa8357-07.html. Vizier catalog entry
- ↑ 2.0 2.1 2.2 2.3 "Theta Indi". SIMBAD Astronomical Database. http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=Theta+Indi. Retrieved 2016-08-23.
- ↑ Gray, R. O.; Garrison, R. F. (July 1989), "The late A-type stars - Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation", Astrophysical Journal Supplement Series 70 (4): 623–636, doi:10.1086/191349, Bibcode: 1989ApJS...70..623G
- ↑ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Carnegie Institution of Washington), Bibcode: 1953GCRV..C......0W
- ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. Vizier catalog entry
- ↑ 6.0 6.1 David, Trevor J.; Hillenbrand, Lynne A. (May 2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal 804 (2): 146–184. doi:10.1088/0004-637X/804/2/146. Bibcode: 2015ApJ...804..146D. Vizier catalog entry
- ↑ 7.0 7.1 7.2 Plavchan, Peter et al. (June 2009), "New Debris Disks Around Young, Low-Mass Stars Discovered with the Spitzer Space Telescope", The Astrophysical Journal 698 (2): 1068–1094, doi:10.1088/0004-637X/698/2/1068, Bibcode: 2009ApJ...698.1068P.
- ↑ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society 427 (1): 343–357. doi:10.1111/j.1365-2966.2012.21873.x. Bibcode: 2012MNRAS.427..343M. Vizier catalog entry
- ↑ 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 Vizier catalog entry
- ↑ Mason, Brian D. et al. (December 2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M Vizier catalog entry
- ↑ Marion, L.; Absil, O.; Ertel, S.; Le Bouquin, J.-B.; Defrère, D. (July 2014), Rajagopal, Jayadev K; Creech-Eakman, Michelle J; Malbet, Fabien, eds., "Unveiling new stellar companions from the PIONIER exozodi survey", Proceedings of the SPIE, Optical and Infrared Interferometry IV 9146: 91461K, doi:10.1117/12.2057823, Bibcode: 2014SPIE.9146E..1KM
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