Theta Indi

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]

θ Indi
Location of θ Indi (circled)
Observation data
Epoch J2000      Equinox J2000
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
Distance99 ± 1 ly
(30.3 ± 0.4 pc)
Absolute magnitude (MV)1.98[5]
Details
Mass1.75[6] M☉
Radius1.61[7] R☉
Luminosity12.95[8] L☉
Temperature8,332[6] K
Rotational velocity (v sin i)135[7] km/s
Age150±100[7] Myr
Other designations
CPD−53° 10037, GC 29819, HIP 105319, HR 8140, HD 202730, SAO 246965, WDS J21199-5327AB [2]
Database references
SIMBADdata

References
  1. van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
  2. "Theta Indi". SIMBAD Astronomical Database. Retrieved 2016-08-23.
  3. 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, Bibcode:1989ApJS...70..623G, doi:10.1086/191349
  4. Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W, LCCN 54001336
  5. Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644. Vizier catalog entry
  6. 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. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607. Vizier catalog entry
  7. 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, arXiv:0904.0819, Bibcode:2009ApJ...698.1068P, doi:10.1088/0004-637X/698/2/1068, S2CID 51417657.
  8. 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. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID 118665352. Vizier catalog entry
  9. 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976 Vizier catalog entry
  10. 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, Bibcode:2001AJ....122.3466M, doi:10.1086/323920 Vizier catalog entry
  11. 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, arXiv:1410.5714, Bibcode:2014SPIE.9146E..1KM, doi:10.1117/12.2057823, S2CID 54045048


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