1 Lupi

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1 Lupi
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Lupus
Right ascension 15h 14m 37.32104s [1]
Declination −31° 31′ 08.8434″ [1]
Apparent magnitude  (V)4.90 [2]
Characteristics
Spectral type F1 III [3] or F0 Ib-II [4]
U−B color index +0.26 [2]
B−V color index 0.37 [5]
Astrometry
Radial velocity (Rv)−22.80 [6] km/s
Proper motion (μ)RA: −9.873 [1] mas/yr
Dec.: –0.892 [1] mas/yr
Parallax (π)1.8055±0.1876  mas [1]
Distance approx. 1,800  ly
(approx. 550  pc)
Absolute magnitude  (MV)−3.93 [7]
Details
Mass 6.9±0.1 [8]   M☉
Radius 41.3+2.2
−1.7 [1]   R☉
Luminosity 2,900 [9]   L☉
Temperature 6,867 [6]   K
Rotational velocity (v sin i)3.9±0.2 [5]  km/s
Age 47.1±3.8 [8]   Myr
Other designations
i Lup, 1 Lup, CD−31°11813, HD 135153, HIP 74604, HR 5660, SAO 206445 [10]
Database references
SIMBAD data

1 Lupi is a solitary [11] giant star in the southern constellation of Lupus. It has the Bayer designation i Lupi; 1 Lupi is the Flamsteed designation. The apparent visual magnitude is 4.90, [2] which indicates it is faintly visible to the naked eye. Based on parallax measurements, this star is approximately 1,800  light-years from the Sun. [1] It is moving closer to the Earth with a heliocentric radial velocity of −23 km/s. [6]

Houk (1978) assigned the spectral classification of this star as F1III, [3] which suggests it is an F-type (yellow-white) star that has evolved away from the main sequence and expanded into a giant. However, Gray et al. (2001) found a class of F0 Ib-II, [4] matching a supergiant/bright giant star. It has a mass around seven times that of the Sun [8] and has expanded to 41 [1] times the Sun's radius. The star is radiating 2,900 [9] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 6,867  K . [6] The estimated age of the star is around 47 million years. [8]

References

  1. 1 2 3 4 5 6 7 8 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  2. 1 2 3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
  3. 1 2 Houk, N. (1978), Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars, vol. 2, Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. 1 2 Gray, R. O.; et al. (April 2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", The Astronomical Journal, 121 (4): 2148–2158, Bibcode:2001AJ....121.2148G, doi: 10.1086/319956 .
  5. 1 2 Ammler-von Eiff, Matthias; Reiners, Ansgar (June 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, S2CID   53666672.
  6. 1 2 3 4 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, S2CID   119231169.
  7. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971 , Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID   119257644.
  8. 1 2 3 4 Tetzlaff, N.; et al. (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.
  9. 1 2 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 , S2CID   118665352.
  10. ↑ "i Lup -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg , retrieved 2016-03-07.
  11. ↑ 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 , S2CID   14878976.
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