Rho Telescopii

Rho Telescopii (ρ Tel, ρ Telescopii) is the Bayer designation for an astrometric binary[9] star system in the southern constellation of Telescopium. It is visible to the naked eye, with an apparent visual magnitude of +5.17.[2] Based upon an annual parallax shift of 17.63 mas as measured from Earth,[1] it is located approximately 185 light years from the Sun.

Rho Telescopii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sculptor
Right ascension  19h 06m 19.95580s[1]
Declination −52° 20′ 27.2757″[1]
Apparent magnitude (V) +5.17[2]
Characteristics
Spectral type F6 V[3]
B−V color index +0.53[2]
Astrometry
Radial velocity (Rv)+0.1±0.7[4] km/s
Proper motion (μ) RA: +32.47[1] mas/yr
Dec.: −115.24[1] mas/yr
Parallax (π)17.63 ± 0.59[1] mas
Distance185 ± 6 ly
(57 ± 2 pc)
Absolute magnitude (MV)1.69[5]
Details
Mass1.97[4] M☉
Luminosity25.6[6] L☉
Surface gravity (log g)3.51[4] cgs
Temperature6,303±80[4] K
Metallicity [Fe/H]+0.01[7] dex
Rotational velocity (v sin i)68.5±4.0[5] km/s
Age1.30[4] Gyr
Other designations
ρ Tel, CPD−52° 11356, HD 177171, HIP 93815, HR 7213, SAO 245921[8]
Database references
SIMBADdata

This appears to be a single-lined spectroscopic binary as it displays radial velocity variation with a period of 1.7 days.[9] The visible component is an F-type main sequence star with a stellar classification of F6 V.[3] It has about double the mass of the Sun and is radiating 25.6[6] times the solar luminosity from its photosphere at an effective temperature of 6,303 K.[4] The star is a bright X-ray source with a luminosity of 65.76×1029 ergs s−1.[10]

Relative to neighboring stars, Rho Telescopii has a peculiar velocity of 17.2 km s−1.[11] It may be a member of the Tucana-Horologium association.[12]

Various age estimates
Age Source
1.5±0.2 Myr Tetzlaff et al. (2011)[11]
30 Myr Lagrange et al. (2013)[9]
0.20 Gyr Ballering et al. (2013)[13]
1.30 Gyr Casagrande et al. (2011)[4]

References
  1. van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752v1, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 Note: see VizieR catalogue I/311.
  2. Johnson, H. L.; et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99). Bibcode:1966CoLPL...4...99J.
  3. Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H
  4. Casagrande, L.; et al. (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): 21, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276.
  5. Ammler-von Eiff, M.; Reiners, A. (2012), "New measurements of rotation and differential rotation in A-F stars: Are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724.
  6. McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  7. Maldonado, J.; et al. (May 2012), "Metallicity of solar-type stars with debris discs and planets", Astronomy and Astrophysics, 541: A40, arXiv:1202.5884, Bibcode:2012A&A...541A..40M, doi:10.1051/0004-6361/201218800.
  8. "rho Tel – Star", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-03-28
  9. Lagrange, A.-M.; et al. (November 2013), "Planets around stars in young nearby associations. Radial velocity searches: a feasibility study and first results", Astronomy & Astrophysics, 559: 20, arXiv:1304.5505, Bibcode:2013A&A...559A..83L, doi:10.1051/0004-6361/201220770, A83.
  10. Makarov, Valeri V. (October 2003), "The 100 Brightest X-Ray Stars within 50 Parsecs of the Sun", The Astronomical Journal, 126 (4): 1996–2008, Bibcode:2003AJ....126.1996M, doi:10.1086/378164.
  11. Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x
  12. Fernández, D.; Figueras, F.; Torra, J. (March 2008), "On the kinematic evolution of young local associations and the Scorpius-Centaurus complex", Astronomy and Astrophysics, 480 (3): 735–751, arXiv:0801.0605, Bibcode:2008A&A...480..735F, doi:10.1051/0004-6361:20077720
  13. Ballering, Nicholas P.; et al. (September 2013), "A Trend between Cold Debris Disk Temperature and Stellar Type: Implications for the Formation and Evolution of Wide-orbit Planets", The Astrophysical Journal, 775 (1): 14, arXiv:1308.2223, Bibcode:2013ApJ...775...55B, doi:10.1088/0004-637X/775/1/55, 55
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