Theta Indi
  | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Indus[1] |
| Right ascension | 21h 19m 51.9895s[2] |
| Declination | −53° 26′ 57.934″[2] |
| Apparent magnitude (V) | +4.39[1] |
| Characteristics | |
| Spectral type | A5IV-V[3] |
| B−V color index | +0.191±0.004[1] |
| Astrometry | |
| Radial velocity (Rv) | −14.50[4] km/s |
| Proper motion (μ) | RA: +106.99 mas/yr[2] Dec.: −66.46 mas/yr[2] |
| Parallax (π) | 33.0546±0.0948 mas[2] |
| Distance | 98.7 ± 0.3 ly (30.25 ± 0.09 pc) |
| Absolute magnitude (MV) | +1.98[1] |
| Details | |
| A | |
| Mass | 1.774±0.040[5] M☉ |
| Radius | 1.736±0.062[5] R☉ |
| Luminosity | 11.9±0.7[5] L☉ |
| Surface gravity (log g) | 4.208±0.032[5] cgs |
| Temperature | 8,133±70[5] K |
| Metallicity [Fe/H] | +0.08[1] dex |
| Rotational velocity (v sin i) | 135[6] km/s |
| Age | 617±179[5] Myr |
| Ba | |
| Mass | 1.08[7] M☉ |
| Bb | |
| Mass | 0.53[7] M☉ |
| Other designations | |
| CPD−53°10037, GC 29819, HIP 105319, HR 8140, HD 202730, SAO 246965, WDS J21199-5327AB[8] | |
| Database references | |
| SIMBAD | data |
Theta Indi (θ Ind) is a binary star in the constellation Indus. Its apparent magnitude is +4.39[1] and it is approximately 98.7 light years away based on parallax.[2]
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] It is a binary system itself with an orbital period of 30 years. Its components have masses of 1.08 and 0.54 M☉.[7]
Interferometric 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] although the star does not exhibit the radial velocity variations and astrometric anomalies expected for such a companion.[7]
References
[edit]- 1 2 3 4 5 6 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
- 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ↑ 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
- ↑ 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
- 1 2 3 4 5 6 Tuchow, Noah W.; Stark, Christopher C.; Mamajek, Eric (2024-02-29). "HPIC: The Habitable Worlds Observatory Preliminary Input Catalog". The Astronomical Journal. 167 (3): 139. doi:10.3847/1538-3881/ad25ec. ISSN 0004-6256.
- ↑ 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.
- 1 2 3 4 Tokovinin, Andrei; Mason, Brian D.; Mendez, Rene A.; Costa, Edgardo (2024-06-24). "Speckle Interferometry at SOAR Telescope in 2023". The Astronomical Journal. 168 (1): 28. doi:10.3847/1538-3881/ad4d56. ISSN 0004-6256.
- ↑ "Theta Indi". SIMBAD Astronomical Database. Retrieved 2016-08-23.
- ↑ 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
- ↑ 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
- ↑ Marion, L.; Absil, O.; Ertel, S.; Le Bouquin, J.-B.; Defrère, D. (July 2014). "Unveiling new stellar companions from the PIONIER exozodi survey". In Rajagopal, Jayadev K; Creech-Eakman, Michelle J; Malbet, Fabien (eds.). Optical and Infrared Interferometry IV. Proceedings of the SPIE. Vol. 9146. pp. 91461K. arXiv:1410.5714. Bibcode:2014SPIE.9146E..1KM. doi:10.1117/12.2057823. S2CID 54045048.
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