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Iota Lupi

ι Lupi, Latinised as Iota Lupi, is a solitary[11] star in the southern constellation of Lupus. It is visible to the naked eye with an apparent visual magnitude of 3.54.[2] Based upon an annual parallax shift of 9.65 mas as seen from Earth, it is located around 338 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.23 due to interstellar dust.[5] Relative to its neighbors, this star has a peculiar velocity of 27.4±4.9 km/s.[6] It appears to be a member of the Scorpio-Centaurus OB association.[12]

ι Lupi
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lupus
Right ascension 14h 19m 24.22219s[1]
Declination −46° 03′ 29.1437″[1]
Apparent magnitude (V) 3.54[2]
Characteristics
Spectral type B2.5 IV[3]
U−B color index −0.742[2]
B−V color index −0.180[2]
Astrometry
Radial velocity (Rv)21.6±4.1[4] km/s
Proper motion (μ) RA: −12.56[1] mas/yr
Dec.: −4.76[1] mas/yr
Parallax (π)9.65 ± 0.20 mas[1]
Distance338 ± 7 ly
(104 ± 2 pc)
Absolute magnitude (MV)−1.48[5]
Details
Mass6.9±0.1[6] M
Radius4.05±0.33[7] R
Luminosity (bolometric)2,082[8] L
Surface gravity (log g)3.94±0.07[7] cgs
Temperature18,605±221[7] K
Metallicity [Fe/H]+0.19±0.15[7] dex
Rotational velocity (v sin i)370[9] km/s
Age20.3±4.8[6] Myr
Other designations
ι Lup, CD−45° 9084, HD 125238, HIP 69996, HR 5354, SAO 224833.[10]
Database references
SIMBADdata

This star has the spectrum of a B-type subgiant star with a stellar classification of B2.5 IV,[3] which may indicate that it has used up its core supply of hydrogen and has begun to expand off the main-sequence. It is rotating rapidly with a projected rotational velocity of 370 km/s.[9] This is giving the star an oblate shape with an equatorial bulge that is an estimated 12% larger than the polar radius.[13] It is about 20[6] million years old with 6.9[6] times the mass of the Sun and 4[7] times the Sun's radius. The star radiates 2,082[8] times the solar luminosity from its outer atmosphere at an effective temperature of 18,605[7] K.

References Edit

  1. ^ a b c d e 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.
  2. ^ 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.
  3. ^ a b Hiltner, W. A.; et al. (July 1969), "MK Spectral Types for Bright Southern OB Stars", Astrophysical Journal, 157: 313–326, Bibcode:1969ApJ...157..313H, doi:10.1086/150069.
  4. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  5. ^ 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, S2CID 119108982.
  6. ^ a b c d e 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.
  7. ^ a b c d e f Fitzpatrick, E. L.; Massa, D. (March 2005), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry", The Astronomical Journal, 129 (3): 1642–1662, arXiv:astro-ph/0412542, Bibcode:2005AJ....129.1642F, doi:10.1086/427855, S2CID 119512018.
  8. ^ a b Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355, S2CID 111387483.
  9. ^ a b Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory, University of Kyoto, Bibcode:1970crvs.book.....U.
  10. ^ "iot Lup -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-03-05.
  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.
  12. ^ de Geus, E. J.; et al. (June 1989), "Physical parameters of stars in the Scorpio-Centaurus OB association", Astronomy and Astrophysics, 216 (1–2): 44–61, Bibcode:1989A&A...216...44D.
  13. ^ Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.

External links Edit

  • Kaler, James B. (August 9, 2013), "Iota Lupi", Stars, University of Illinois, retrieved 2017-03-06.

iota, lupi, lupi, latinised, solitary, star, southern, constellation, lupus, visible, naked, with, apparent, visual, magnitude, based, upon, annual, parallax, shift, seen, from, earth, located, around, light, years, from, that, distance, visual, magnitude, sta. i Lupi Latinised as Iota Lupi is a solitary 11 star in the southern constellation of Lupus It is visible to the naked eye with an apparent visual magnitude of 3 54 2 Based upon an annual parallax shift of 9 65 mas as seen from Earth it is located around 338 light years from the Sun At that distance the visual magnitude of the star is diminished by an extinction factor of 0 23 due to interstellar dust 5 Relative to its neighbors this star has a peculiar velocity of 27 4 4 9 km s 6 It appears to be a member of the Scorpio Centaurus OB association 12 i Lupi Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation LupusRight ascension 14h 19m 24 22219s 1 Declination 46 03 29 1437 1 Apparent magnitude V 3 54 2 CharacteristicsSpectral type B2 5 IV 3 U B color index 0 742 2 B V color index 0 180 2 AstrometryRadial velocity Rv 21 6 4 1 4 km sProper motion m RA 12 56 1 mas yr Dec 4 76 1 mas yrParallax p 9 65 0 20 mas 1 Distance338 7 ly 104 2 pc Absolute magnitude MV 1 48 5 DetailsMass6 9 0 1 6 M Radius4 05 0 33 7 R Luminosity bolometric 2 082 8 L Surface gravity log g 3 94 0 07 7 cgsTemperature18 605 221 7 KMetallicity Fe H 0 19 0 15 7 dexRotational velocity v sin i 370 9 km sAge20 3 4 8 6 MyrOther designationsi Lup CD 45 9084 HD 125238 HIP 69996 HR 5354 SAO 224833 10 Database referencesSIMBADdataThis star has the spectrum of a B type subgiant star with a stellar classification of B2 5 IV 3 which may indicate that it has used up its core supply of hydrogen and has begun to expand off the main sequence It is rotating rapidly with a projected rotational velocity of 370 km s 9 This is giving the star an oblate shape with an equatorial bulge that is an estimated 12 larger than the polar radius 13 It is about 20 6 million years old with 6 9 6 times the mass of the Sun and 4 7 times the Sun s radius The star radiates 2 082 8 times the solar luminosity from its outer atmosphere at an effective temperature of 18 605 7 K References Edit a b c d e van Leeuwen F 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 Bibcode 2007A amp 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 Hiltner W A et al July 1969 MK Spectral Types for Bright Southern OB Stars Astrophysical Journal 157 313 326 Bibcode 1969ApJ 157 313H doi 10 1086 150069 de Bruijne J H J Eilers A C October 2012 Radial velocities for the HIPPARCOS Gaia Hundred Thousand Proper Motion project Astronomy amp Astrophysics 546 14 arXiv 1208 3048 Bibcode 2012A amp A 546A 61D doi 10 1051 0004 6361 201219219 S2CID 59451347 A61 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 S2CID 119108982 a b c d e 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 a b c d e f Fitzpatrick E L Massa D March 2005 Determining the Physical Properties of the B Stars II Calibration of Synthetic Photometry The Astronomical Journal 129 3 1642 1662 arXiv astro ph 0412542 Bibcode 2005AJ 129 1642F doi 10 1086 427855 S2CID 119512018 a b Hohle M M et al April 2010 Masses and luminosities of O and B type stars and red supergiants Astronomische Nachrichten 331 4 349 arXiv 1003 2335 Bibcode 2010AN 331 349H doi 10 1002 asna 200911355 S2CID 111387483 a b Uesugi Akira Fukuda Ichiro 1970 Catalogue of rotational velocities of the stars Contributions from the Institute of Astrophysics and Kwasan Observatory University of Kyoto Bibcode 1970crvs book U iot Lup Variable Star SIMBAD Astronomical Database Centre de Donnees astronomiques de Strasbourg retrieved 2017 03 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 S2CID 14878976 de Geus E J et al June 1989 Physical parameters of stars in the Scorpio Centaurus OB association Astronomy and Astrophysics 216 1 2 44 61 Bibcode 1989A amp A 216 44D Belle G T 2012 Interferometric observations of rapidly rotating stars The Astronomy and Astrophysics Review 20 1 51 arXiv 1204 2572 Bibcode 2012A amp ARv 20 51V doi 10 1007 s00159 012 0051 2 S2CID 119273474 External links EditKaler James B August 9 2013 Iota Lupi Stars University of Illinois retrieved 2017 03 06 Retrieved from https en wikipedia org w index php title Iota Lupi amp oldid 1169993965, wikipedia, wiki, book, books, library,

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