Lambda Telescopii
λ Telescopii, Latinized as Lambda Telescopii, is a solitary,[9] white-hued star in the southern constellation of Telescopium. It is visible to the naked eye as a faint point of light with an apparent magnitude of +4.87.[2] This body is located approximately 610 light years from the Sun based on parallax.[1] At that distance, the visual magnitude of the star is diminished by an extinction of 0.18 due to interstellar dust.[5]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 18h 58m 27.76710s[1] |
| Declination | −52° 56′ 19.0622″[1] |
| Apparent magnitude (V) | +4.87[2] |
| Characteristics | |
| Spectral type | B9.5IV/V[3] or A0V[4] |
| B−V color index | −0.05[2] |
| Astrometry | |
| Proper motion (μ) | RA: +12.18[1] mas/yr Dec.: −8.76[1] mas/yr |
| Parallax (π) | 5.33 ± 0.25[1] mas |
| Distance | 610 ± 30 ly (188 ± 9 pc) |
| Absolute magnitude (MV) | +0.45[5] |
| Details | |
| Luminosity | 350[6] L☉ |
| Surface gravity (log g) | 3.42[7] cgs |
| Temperature | 10,139[7] K |
| Metallicity [Fe/H] | +0.19[7] dex |
| Rotational velocity (v sin i) | 110[4] km/s |
| Age | 268[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a late B- or early A-type main-sequence star[3][4] that is generating energy through core hydrogen fusion. The star is 268[5] million years old with a relatively high rate of spin, showing a projected rotational velocity of 110.[4] It has a higher than solar metallicity – the abundance of elements more massive than Helium.[7] The star is radiating 350[6] times the Sun's luminosity from its photosphere at an effective temperature of 10,139 K.[7]
References
- 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.
- Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
- Houk, Nancy; Cowley, A. P. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
- Levato, O. H. (August 1972), "Rotational Velocities and Spectral Types of Some A-Type Stars", Publications of the Astronomical Society of the Pacific, 84 (500): 584, Bibcode:1972PASP...84..584L, doi:10.1086/129336
- Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035.
- 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.
- Soubiran, C.; Le Campion, J.-F.; Cayrel de Strobel, G.; Caillo, A. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247.
- "lam Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-05.
- 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.