Delta1 Telescopii

Delta¹ Telescopii
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Telescopium
Right ascension	18h 31m 45.43288s
Declination	−45° 54′ 53.3166″
Apparent magnitude (V)	4.94
Characteristics
Spectral type	B6 IV
U−B color index	−0.438
B−V color index	−0.121
Astrometry
Proper motion (μ)	RA: −3.75 mas/yr ; Dec.: −27.43 mas/yr
Parallax (π)	4.61 ± 0.19 mas
Distance	710 ± 30 ly ; (217 ± 9 pc)
Absolute magnitude (MV)	−0.74
Orbit
Period (P)	18.8456 d
Eccentricity (e)	0.51
Periastron epoch (T)	2435003.693 JD
Argument of periastron (ω); (secondary)	78°
Semi-amplitude (K1); (primary)	65.0 km/s
Details
δ1 Tel A
Mass	4.52±0.06 M☉
Radius	4.7 R☉
Luminosity	899 L☉
Temperature	12,417 K
Rotational velocity (v sin i)	11 km/s
Age	178 Myr
Other designations
	δ1 Tel, CD−45° 12550, HD 170465, HIP 90830, HR 6934, SAO 229092
Database references
SIMBAD	data

Delta¹ Telescopii is a blue-white-hued binary star^[5] system in the southern constellation of Telescopium. It is faintly visible to the naked eye, having an apparent visual magnitude of 4.94.^[2] Based upon an annual parallax shift of 4.61 mas as seen from Earth,^[1] this system is roughly 710 light-years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.29 due to interstellar dust.^[4]

This system is a single-lined spectroscopic binary with an orbital period of 18.8 days and an eccentricity of 0.51.^[5] The estimated size of the semimajor axis has a minimum of 14.5×10⁶ km, with the uncertainty due to lack of a value for the orbital inclination.^[8] The primary, component A, has a stellar classification of B6 IV,^[3] suggesting it is an evolving B-type subgiant star. Delta¹ Telescopii has an estimated 4.5^[3] times the mass of the Sun and about 4.7^[6] times the Sun's radius. It is radiating 899^[3] times the solar luminosity from its photosphere at an effective temperature of 12,417 K.^[3]

References

^ ^a ^b ^c ^d ^e ^f 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, S2CID 18759600.
^ ^a ^b ^c ^d Gutierrez-Moreno, Adelina; Moreno, Hugo (June 1968), "A photometric investigation of the Scorpio-Centaurus association", Astrophysical Journal Supplement, 15: 459, Bibcode:1968ApJS...15..459G, doi:10.1086/190168.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
^ ^a ^b ^c 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.
^ ^a ^b ^c Pourbaix, D.; et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics, 424: 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
^ ^a ^b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (3rd ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
^ "del01 Tel -- Spectroscopic binary", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-07.
^ Buscombe, W.; Kennedy, P. M. (August 1962), "Two B-Type Spectroscopic Binaries", Publications of the Astronomical Society of the Pacific, 74 (439): 323, Bibcode:1962PASP...74..323B, doi:10.1086/127818.

[vanLeeuwen2007-1] ^ ^a ^b ^c ^d ^e ^f 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, S2CID 18759600.

[apjs15-2] Gutierrez-Moreno, Adelina; Moreno, Hugo (June 1968), "A photometric investigation of the Scorpio-Centaurus association", Astrophysical Journal Supplement, 15: 459, Bibcode:1968ApJS...15..459G, doi:10.1086/190168.

[Zorec2012-3] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.

[Gontcharov2012-4] 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.

[Pourbaix2009-5] Pourbaix, D.; et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics, 424: 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.

[PasinettiFracassini2001-6] Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (3rd ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.

[SIMBAD-7] "del01 Tel -- Spectroscopic binary", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-07.

[Buscombe1962-8] Buscombe, W.; Kennedy, P. M. (August 1962), "Two B-Type Spectroscopic Binaries", Publications of the Astronomical Society of the Pacific, 74 (439): 323, Bibcode:1962PASP...74..323B, doi:10.1086/127818.

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Delta1 Telescopii

References

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