fbpx
Wikipedia

Phi Sagittarii

December 02, 2023

Phi Sagittarii, Latinized from φ Sagittarii, is an interferometric binary star in the southern constellation of Sagittarius. With an apparent visual magnitude of 3.17,[2] it is the ninth-brightest star in the constellation and is readily visible to the naked eye. Parallax measurements place it at a distance of roughly 239 light-years (73 parsecs) from the Earth.[1] It is receding with a radial velocity of +21.5 km/s.[2]

Phi Sagittarii
Location of φ Sagittarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension 18h 45m 39.38610s[1]
Declination −26° 59′ 26.7944″[1]
Apparent magnitude (V) 3.17[2]
Characteristics
Spectral type B8.5 III[3]
U−B color index −0.36[4]
B−V color index −0.11[4]
Astrometry
Radial velocity (Rv)+21.5[2] km/s
Proper motion (μ) RA: +50.61[1] mas/yr
Dec.: +1.22[1] mas/yr
Parallax (π)13.63 ± 0.19 mas[1]
Distance239 ± 3 ly
(73 ± 1 pc)
Absolute magnitude (MV)−1.16[5]
Details
Mass3.41[6] M☉
Radius4.8[7] R☉
Luminosity475[7] L☉
Surface gravity (log g)3.73[6] cgs
Temperature12,487±425[6] K
Rotational velocity (v sin i)46[6] km/s
Age152[6] Myr
Other designations
Namalsadirah 1, Awal al Sadira, φ Sgr, Phi Sgr, 27 Sagittarii, CPD−27  5241, FK5 1487, GC 25661, HD 173300, HIP 92041, HR 7039, SAO 268859, PPM 297231[8]
Database references
SIMBADdata

The stellar classification of this star has been rated at B8.5 III,[3] with the luminosity class of III indicating it is a giant star evolved away from the main sequence after it has exhausted the hydrogen at its core. This energy is being radiated from the star's outer envelope at an effective temperature of 12487 K,[6] which produces the blue-white hue typical of B-type stars.[9]

This star has been catalogued as a spectroscopic binary[10] and a companion was apparently detected through lunar occultation.[11] However, the latter was pointed out as spurious.[7][12] Interferometric observations taken in 2017 finally revealed that Phi Sgr is indeed a binary by resolving a companion with a near-infrared K band flux ratio of 6% (corresponding to a mass of 1.6 M☉) at a separation of 17.7 mas (1.3 au).[13]

Name and etymology edit

In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Aoul al Sadirah, which was translated into Latin as Prima τού al Sadirah, meaning first returning ostrich.[14]

In Chinese, 斗 (Dǒu), meaning Dipper, refers to an asterism consisting of φ Sagittarii, λ Sagittarii, μ Sagittarii, σ Sagittarii, τ Sagittarii and ζ Sagittarii. Consequently, the Chinese name for φ Sagittarii itself is 斗宿一 (Dǒu Xiù yī, English: the First Star of Dipper.)[15]

This star, together with γ Sgr, δ Sgr, ε Sgr, ζ Sgr, λ Sgr, σ Sgr and τ Sgr comprising the Teapot asterism.[16] φ Sgr, σ Sgr, ζ Sgr, χ Sgr and τ Sgr were Al Naʽām al Ṣādirah (النعم السادرة), the Returning Ostriches.[17] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Naʽām al Ṣādirah or Namalsadirah was originally the title for four stars: φ Sgr as Namalsadirah I, τ Sgr as Namalsadirah II, χ1 Sgr as Namalsadirah III and χ2 Sgr as Namalsadirah IV (except σ Sgr and ζ Sgr) .[18]

References edit

  1. ^ a b c d e f 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
  2. ^ a b c d Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, Astronomisches Rechen-Institut Heidelberg, 35 (35): 1, Bibcode:1999VeARI..35....1W
  3. ^ a b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H
  4. ^ a b 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
  5. ^ 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.
  6. ^ a b c d e f David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  7. ^ a b c Kaler, James B., "PHI SGR (Phi Sagittarii)", Stars, University of Illinois, retrieved 2012-01-15
  8. ^ "phi Sgr -- Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2012-01-15
  9. ^ , 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
  10. ^ Lee, O. J. (1910-11-01). "Measures on nineteen new spectroscopic binaries". The Astrophysical Journal. 32: 300–308. Bibcode:1910ApJ....32..300L. doi:10.1086/141806. ISSN 0004-637X.
  11. ^ Finsen, W. S. (April 1951), "The duplicity of phi Sgr", Astronomical Journal, 56: 56, Bibcode:1951AJ.....56Q..56F, doi:10.1086/106589
  12. ^ 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
  13. ^ Waisberg, Idel; Klein, Ygal; Katz, Boaz (2023-05-16). "Hidden Companions to Intermediate-mass Stars. III. Discovery of a 1.6M ⊙ , 1.3 au Companion to HIP 92041 = ϕ Sagittarii*". Research Notes of the AAS. 7 (5): 95. Bibcode:2023RNAAS...7...95W. doi:10.3847/2515-5172/acd4bf. ISSN 2515-5172.
  14. ^ Knobel, E. B. (June 1895), "Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket", Monthly Notices of the Royal Astronomical Society, 55: 430, Bibcode:1895MNRAS..55..429K, doi:10.1093/mnras/55.8.429.
  15. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 11 日
  16. ^ Teapot, constellation-guide.com, retrieved 2017-05-13.
  17. ^ Allen, R. H. (1963), Star Names: Their Lore and Meaning (Reprint ed.), New York: Dover Publications Inc, p. 355, ISBN 0-486-21079-0, retrieved 2012-09-04.
  18. ^ Rhoads, Jack W. (November 15, 1971), Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars (PDF), Jet Propulsion Laboratory, California Institute of Technology.{{citation}}: CS1 maint: location missing publisher (link)

December 02, 2023
sagittarii, latinized, from, sagittarii, interferometric, binary, star, southern, constellation, sagittarius, with, apparent, visual, magnitude, ninth, brightest, star, constellation, readily, visible, naked, parallax, measurements, place, distance, roughly, l. Phi Sagittarii Latinized from f Sagittarii is an interferometric binary star in the southern constellation of Sagittarius With an apparent visual magnitude of 3 17 2 it is the ninth brightest star in the constellation and is readily visible to the naked eye Parallax measurements place it at a distance of roughly 239 light years 73 parsecs from the Earth 1 It is receding with a radial velocity of 21 5 km s 2 Phi SagittariiLocation of f Sagittarii circled Observation dataEpoch J2000 Equinox J2000Constellation SagittariusRight ascension 18h 45m 39 38610s 1 Declination 26 59 26 7944 1 Apparent magnitude V 3 17 2 CharacteristicsSpectral type B8 5 III 3 U B color index 0 36 4 B V color index 0 11 4 AstrometryRadial velocity Rv 21 5 2 km sProper motion m RA 50 61 1 mas yr Dec 1 22 1 mas yrParallax p 13 63 0 19 mas 1 Distance239 3 ly 73 1 pc Absolute magnitude MV 1 16 5 DetailsMass3 41 6 M Radius4 8 7 R Luminosity475 7 L Surface gravity log g 3 73 6 cgsTemperature12 487 425 6 KRotational velocity v sin i 46 6 km sAge152 6 MyrOther designationsNamalsadirah 1 Awal al Sadira f Sgr Phi Sgr 27 Sagittarii CPD 27 5241 FK5 1487 GC 25661 HD 173300 HIP 92041 HR 7039 SAO 268859 PPM 297231 8 Database referencesSIMBADdataThe stellar classification of this star has been rated at B8 5 III 3 with the luminosity class of III indicating it is a giant star evolved away from the main sequence after it has exhausted the hydrogen at its core This energy is being radiated from the star s outer envelope at an effective temperature of 12487 K 6 which produces the blue white hue typical of B type stars 9 This star has been catalogued as a spectroscopic binary 10 and a companion was apparently detected through lunar occultation 11 However the latter was pointed out as spurious 7 12 Interferometric observations taken in 2017 finally revealed that Phi Sgr is indeed a binary by resolving a companion with a near infrared K band flux ratio of 6 corresponding to a mass of 1 6 M at a separation of 17 7 mas 1 3 au 13 Name and etymology editIn the catalogue of stars in the Calendarium of Al Achsasi al Mouakket this star was designated Aoul al Sadirah which was translated into Latin as Prima toy al Sadirah meaning first returning ostrich 14 In Chinese 斗 Dǒu meaning Dipper refers to an asterism consisting of f Sagittarii l Sagittarii m Sagittarii s Sagittarii t Sagittarii and z Sagittarii Consequently the Chinese name for f Sagittarii itself is 斗宿一 Dǒu Xiu yi English the First Star of Dipper 15 This star together with g Sgr d Sgr e Sgr z Sgr l Sgr s Sgr and t Sgr comprising the Teapot asterism 16 f Sgr s Sgr z Sgr x Sgr and t Sgr were Al Naʽam al Ṣadirah النعم السادرة the Returning Ostriches 17 According to the catalogue of stars in the Technical Memorandum 33 507 A Reduced Star Catalog Containing 537 Named Stars Al Naʽam al Ṣadirah or Namalsadirah was originally the title for four stars f Sgr as Namalsadirah I t Sgr as Namalsadirah II x1 Sgr as Namalsadirah III and x2 Sgr as Namalsadirah IV except s Sgr and z Sgr 18 References edit a b c d e f van Leeuwen F November 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 Wielen R et al 1999 Sixth Catalogue of Fundamental Stars FK6 Part I Basic fundamental stars with direct solutions Veroeffentlichungen des Astronomischen Rechen Instituts Heidelberg Astronomisches Rechen Institut Heidelberg 35 35 1 Bibcode 1999VeARI 35 1W a b Houk Nancy 1979 Michigan catalogue of two dimensional spectral types for the HD stars vol 3 Ann Arbor Michigan Dept of Astronomy University of Michigan Bibcode 1982mcts book H a b 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 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 a b c d e f David Trevor J Hillenbrand Lynne A 2015 The Ages of Early Type Stars Stromgren Photometric Methods Calibrated Validated Tested and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets The Astrophysical Journal 804 2 146 arXiv 1501 03154 Bibcode 2015ApJ 804 146D doi 10 1088 0004 637X 804 2 146 S2CID 33401607 a b c Kaler James B PHI SGR Phi Sagittarii Stars University of Illinois retrieved 2012 01 15 phi Sgr Star SIMBAD Centre de Donnees astronomiques de Strasbourg 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 Lee O J 1910 11 01 Measures on nineteen new spectroscopic binaries The Astrophysical Journal 32 300 308 Bibcode 1910ApJ 32 300L doi 10 1086 141806 ISSN 0004 637X Finsen W S April 1951 The duplicity of phi Sgr Astronomical Journal 56 56 Bibcode 1951AJ 56Q 56F doi 10 1086 106589 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 Waisberg Idel Klein Ygal Katz Boaz 2023 05 16 Hidden Companions to Intermediate mass Stars III Discovery of a 1 6M 1 3 au Companion to HIP 92041 ϕ Sagittarii Research Notes of the AAS 7 5 95 Bibcode 2023RNAAS 7 95W doi 10 3847 2515 5172 acd4bf ISSN 2515 5172 Knobel E B June 1895 Al Achsasi Al Mouakket on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket Monthly Notices of the Royal Astronomical Society 55 430 Bibcode 1895MNRAS 55 429K doi 10 1093 mnras 55 8 429 in Chinese AEEA Activities of Exhibition and Education in Astronomy 天文教育資訊網 2006 年 5 月 11 日 Teapot constellation guide com retrieved 2017 05 13 Allen R H 1963 Star Names Their Lore and Meaning Reprint ed New York Dover Publications Inc p 355 ISBN 0 486 21079 0 retrieved 2012 09 04 Rhoads Jack W November 15 1971 Technical Memorandum 33 507 A Reduced Star Catalog Containing 537 Named Stars PDF Jet Propulsion Laboratory California Institute of Technology a href Template Citation html title Template Citation citation a CS1 maint location missing publisher link Retrieved from https en wikipedia org w index php title Phi Sagittarii amp oldid 1184108009, wikipedia, wiki, book, books, library,

article

, read, download, free, free download, mp3, video, mp4, 3gp, jpg, jpeg, gif, png, picture, music, song, movie, book, game, games.