Astronomy:Zeta Telescopii
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Short description: Second-brightest star in the constellation Telescopus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 18h 28m 49.85980s[1] |
| Declination | −49° 04′ 14.1122″[1] |
| Apparent magnitude (V) | +4.13[2] |
| Characteristics | |
| Spectral type | K1 III-IV[3] |
| U−B color index | +0.82[4] |
| B−V color index | +1.02[4] |
| Astrometry | |
| Radial velocity (Rv) | −30.6[5] km/s |
| Proper motion (μ) | RA: +139.10[1] mas/yr Dec.: −228.66[1] mas/yr |
| Parallax (π) | 25.84 ± 0.21[1] mas |
| Distance | 126 ± 1 ly (38.7 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.171[2] |
| Details | |
| Mass | 1.53[2] M☉ |
| Radius | 9[6] R☉ |
| Surface gravity (log g) | 2.78±0.09[7] cgs |
| Temperature | 4,801±39[7] K |
| Metallicity [Fe/H] | −0.19±0.03[7] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
Zeta Telescopii (ζ Telescopii) is the second-brightest star in the southern constellation of Telescopium. It is a solitary,[9] orange-hued star that is visible to the naked eye with an apparent visual magnitude of +4.13.[2] Based upon an annual parallax shift of 25.84 mas as seen from Earth,[1] it is located around 127 light years from the Sun.
This is a red clump[2] giant star of spectral type K1 III-IV.[3] The measured angular diameter is 2.16±0.11 mas.[10] At its estimated distance, this yields a physical size of about 9 times the radius of the Sun.[6] It is around 1.53[2] times as massive as the Sun and it shines at an effective temperature of 4,801 K.[7]
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.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Liu, Y. J. et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society 382 (2): 553–66, doi:10.1111/j.1365-2966.2007.11852.x, Bibcode: 2007MNRAS.382..553L.
- ↑ 3.0 3.1 Gray, R. O. et al. (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): 161–70, doi:10.1086/504637, Bibcode: 2006AJ....132..161G.
- ↑ 4.0 4.1 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
- ↑ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Carnegie Institute of Washington, D.C.), Bibcode: 1953GCRV..C......0W.
- ↑ 6.0 6.1 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41. The radius (R*) is given by:
- [math]\displaystyle{ \begin{align} 2\cdot R_* & = \frac{(38.7\cdot 2.16\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\ & \approx 18\cdot R_{\bigodot} \end{align} }[/math]
- ↑ 7.0 7.1 7.2 7.3 Alves, S. et al. (April 2015), "Determination of the spectroscopic stellar parameters for 257 field giant stars", Monthly Notices of the Royal Astronomical Society 448 (3): 2749–2765, doi:10.1093/mnras/stv189, Bibcode: 2015MNRAS.448.2749A. Per the comments in the paper, this lists the TS13 data.
- ↑ "zet Tel". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=zet+Tel.
- ↑ 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.
- ↑ Richichi, A. et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics 431 (2): 773–777, doi:10.1051/0004-6361:20042039, Bibcode: 2005A&A...431..773R.
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