astro.wikisort.org - StarAlpha Telescopii, Latinized from α Telescopii, is the brightest star in the southern constellation of Telescopium, with an apparent visual magnitude of 3.5.[2] The ancient Roman astronomer Ptolemy included it in the constellation Corona Australis, but it was moved to Telescopium when that constellation was created by French astronomer Nicolas Louis de Lacaille in the 18th century.[9] Parallax measurements put it at a distance of 278 light-years (85 parsecs) from Earth. At that range, the visual magnitude of the star is diminished by an extinction of 0.22 due to interstellar dust.[6]
Star in the constellation Telescopium
α Telescopii
Location of α Telescopii (circled) |
Observation data Epoch J2000 Equinox J2000 |
Constellation |
Telescopium |
Right ascension |
18h 26m 58.41604s[1] |
Declination |
–45° 58′ 06.4498″[1] |
Apparent magnitude (V) |
3.51[2] |
Characteristics |
Spectral type |
B3 IV[3] |
U−B color index |
−0.64[2] |
B−V color index |
−0.17[2] |
Variable type |
SPB[4] |
Astrometry |
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Radial velocity (Rv) | −0.2[5] km/s |
Proper motion (μ) | RA: −16.95[1] mas/yr Dec.: −53.09[1] mas/yr |
Parallax (π) | 11.74 ± 0.17 mas[1] |
Distance | 278 ± 4 ly (85 ± 1 pc) |
Absolute magnitude (MV) | −1.25[6] |
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Details |
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Mass | 5.2±0.4[4] M☉ |
Radius | 3.3±0.5[4] R☉ |
Luminosity | 794[4] L☉ |
Surface gravity (log g) | 4.12±0.20[4] cgs |
Temperature | 16,700±800[4] K |
Rotational velocity (v sin i) | 14±8[4] km/s |
Age | 24.1±7.5[7] Myr |
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Other designations |
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α Tel, CD−46° 12379, FK5 691, HD 169467, HIP 90422, HR 6897, SAO 229023 [8] |
Database references |
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SIMBAD | data |
Properties
Physical Characteristics
This star is much larger than the Sun, with an estimated 5.2±0.4 times the mass and 3.3±0.5 times the radius.[4] The spectrum of the star matches a stellar classification of B3 IV,[3] where the luminosity class of 'IV' indicates this is a subgiant star that has nearly exhausted the supply of hydrogen at its core and is evolving away from the main sequence. Alpha Telescopii is a bright star that is radiating nearly 800 times the Sun's luminosity. This energy is being emitted from the star's outer envelope at an effective temperature of around 16,700 K,[4] giving it the characteristic blue-white hue of a B-type star.[10]
Variability
This is possibly a type of variable star known as a slowly pulsating B-type star. It has a longitudinal magnetic field with a mean strength of –233 ± 43 G.[4] A projected stellar rotation velocity of about 14 km s−1 is considered low for a star of this type,[4] which may indicate it is being viewed from nearly pole-on.[11]
References
- van Leeuwen, F. (November 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, S2CID 18759600
- 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.
- Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H
- Hubrig, S.; et al. (April 2009), "New magnetic field measurements of β Cephei stars and slowly pulsating B stars", Astronomische Nachrichten, 330 (4): 317, arXiv:0902.1314, Bibcode:2009AN....330..317H, doi:10.1002/asna.200811187, S2CID 17497112
- Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E
- 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, S2CID 119108982.
- 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, S2CID 118629873
- "alf Tel -- Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2012-01-15
- Ridpath, Ian, "Corona Austalis, the Southern Crown", Ian Ridpath's Star Tales, retrieved 2012-01-15
- "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16
- Kaler, James B., "ALPHA TEL (Alpha Telescopii)", Stars, University of Illinois, retrieved 2012-01-15
Constellation of Telescopium |
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На других языках
[de] Alpha Telescopii
α Telescopii (Alpha Telescopii; kurz α Tel) ist mit einer scheinbaren Helligkeit von 3,51m der hellste Stern des nur vom Südhimmel aus sichtbaren Sternbilds Teleskop. Dennoch besitzt er keinen Eigennamen und erscheint dem bloßen Auge relativ lichtschwach.[2] Ursprünglich hatte der antike Astronom Ptolemäus den Stern dem Sternbild der Südlichen Krone zugeordnet, ehe α Telescopii im 18. Jahrhundert in das Sternbild Teleskop integriert wurde, als dieses vom französischen Astronomen Nicolas-Louis de Lacaille erfunden wurde.[9] Nach im Dezember 2020 veröffentlichten Auswertungen der Messergebnisse der Raumsonde Gaia ist der Stern etwa 279 Lichtjahre von der Erde entfernt.[1] Das nahezu gleiche Ergebnis ist aus den Messwerten der Raumsonde Hipparcos ableitbar; eine 2007 publizierte Neuauswertung der Hipparcos-Messungen ergab für α Telescopii eine Entfernung von 278 Lichtjahren.[10] In dieser Entfernung wird die scheinbare Helligkeit des Sterns aufgrund der Extinktion des interstellaren Staubs um circa 0,22m abgeschwächt.[7]
- [en] Alpha Telescopii
[es] Alfa Telescopii
Alfa Telescopii (α Tel / HD 169467 / HR 6897) es la estrella más brillante de la constelación de Telescopium con magnitud aparente +3,49.
Aunque no tiene nombre propio habitual, en la astronomía china era conocida como We, «peligro».[1]
Se encuentra a 249 años luz de distancia del Sistema Solar.
[ru] Альфа Телескопа
Альфа Телескопа (α Telescopii, α Tel) — ярчайшая звезда в созвездии Телескопа, видимая звёздная величина равна 3,5.[3] Античный астроном Птолемей включил звезду в созвездие Южной Короны, но затем была отнесена к созвездию Телескопа после того, как это созвездие было создано французским астрономом Никола Луи де Лакайлем в XVIII веке.[10] Измерение параллакса дало оценку расстояния 278 световых лет (85 парсеков) от Солнца. При таком расстоянии яркость звезды уменьшается вследствие межзвёздного поглощения света на 0,22 звёздной величины.[5]
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