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Lambda Telescopii

Summary

λ Telescopii, Latinized as Lambda Telescopii, is a solitary,[17] bluish-white hued star located in the southern constellation of Telescopium. It has an apparent magnitude of 4.84,[2] making it readily visible to the naked eye under ideal conditions. Gaia DR3 parallax measurements imply a distance of 490 light years,[1] and it is currently approaching the Solar System with a somewhat constrained heliocentric radial velocity of −2 km/s.[6] At its current distance, the visual magnitude of Lambda Telescopii is diminished by an extinction of 0.25 due to interstellar dust[18] and it has an absolute magnitude of −1.51.[7]

λ Telescopii
Location of λ Tel (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 18h 58m 27.79251s[1]
Declination −52° 56′ 19.1999″[1]
Apparent magnitude (V) 4.84±0.01[2]
Characteristics
Spectral type B9.5 IV/V[3] or B9 III[4]
B−V color index −0.05[5]
Astrometry
Radial velocity (Rv)−2±4.2[6] km/s
Proper motion (μ) RA: +13.365 mas/yr[1]
Dec.: −8.805 mas/yr[1]
Parallax (π)6.6117 ± 0.1718 mas[1]
Distance490 ± 10 ly
(151 ± 4 pc)
Absolute magnitude (MV)−1.51[7]
Details
Mass2.81+0.36
−0.38[8] M☉
Radius5.53±0.28[9] R☉
Luminosity260+13
−12[1] L☉
Surface gravity (log g)3.56[10] cgs
Temperature10,139[11] K
Metallicity [Fe/H]+0.19[11] dex
Rotational velocity (v sin i)110[12][13] km/s
Age268[14] Myr
Other designations
λ Tel, 41 G. Telescopii[15], CPD−53°9402, FK5 708, GC 26016, HD 175510, HIP 93148, HR 7134, SAO 245834[16]
Database references
SIMBADdata

The object has been given several stellar classifications over the years. Lambda Telescopii has been classified as B9 III (evolved giant star),[4] A0 V (A-type main-sequence star),[13] and B9 .5 IV/V.[3]

The accepted classification for Lambda Telescopii is B9.5 IV/V,[3] indicating that it is a late B-type star with the blended luminosity class of a subgiant and a main sequence star. Gaia DR3 stellar evolution models place it near the end of its main sequence lifetime.[1] The star is 268 million years old[14] with a relatively high rate of spin, showing a projected rotational velocity of 110 km/s.[12][13] Lambda Telescopii is metal enriched with an iron abundance 155% that of the Sun, or [Fe/H] = +0.19.[11] The star has 2.81 times the mass of the Sun[8] and it radiates 260 times the luminosity of the Sun[1] from its photosphere – which is 5.53 times the size of the Sun's – at an effective temperature of 10,193 K.[9] [11]

References edit

  1. ^ a b c d e f g h 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.
  2. ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361. S2CID 17128864.
  3. ^ a b c Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars: Declinations −90° to −53°. Vol. 1. Bibcode:1975mcts.book.....H.
  4. ^ a b de Vaucouleurs, A. (1 August 1957). "Spectral Types and Luminosities of B, A and F Southern Stars". Monthly Notices of the Royal Astronomical Society. 117 (4): 449–462. Bibcode:1957MNRAS.117..449D. doi:10.1093/mnras/117.4.449. eISSN 1365-2966. ISSN 0035-8711. S2CID 121925254.
  5. ^ 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.
  6. ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
  7. ^ a b 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
  8. ^ a b Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.
  9. ^ a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants. Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361. S2CID 6077801.
  10. ^ Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361. S2CID 131780028.
  11. ^ a b c d Erspamer, D.; North, P. (28 January 2003). "Automated spectroscopic abundances of A and F-type stars using echelle spectrographs". Astronomy & Astrophysics. 398 (3): 1121–1135. arXiv:astro-ph/0210065. Bibcode:2003A&A...398.1121E. doi:10.1051/0004-6361:20021711. eISSN 1432-0746. ISSN 0004-6361. S2CID 1109164.
  12. ^ a b Huang, Su-Shu (September 1953). "A Statistical Study of the Rotation of the Stars". The Astrophysical Journal. 118: 285. Bibcode:1953ApJ...118..285H. doi:10.1086/145751. eISSN 1538-4357. ISSN 0004-637X.
  13. ^ a b c Levato, O. H. (August 1972). "Rotational Velocities and Spectral Types of Some A-Type Stars". Publications of the Astronomical Society of the Pacific. 84: 584. Bibcode:1972PASP...84..584L. doi:10.1086/129336. eISSN 1538-3873. ISSN 0004-6280. S2CID 122833746.
  14. ^ a b 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 255202762.
  15. ^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  16. ^ "lam Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 5, 2017.{{cite web}}: CS1 maint: postscript (link)
  17. ^ Eggleton, P. P.; Tokovinin, A. A. (11 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. eISSN 1365-2966. ISSN 0035-8711. S2CID 14878976.
  18. ^ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.

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