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Sigma Puppis

January 01, 1970

Sigma Puppis, Latinized from σ Puppis, is a binary star system in the southern constellation of Puppis. It has an apparent visual magnitude of 3.25,[2] which is bright enough to be visible to the naked eye at night from the Southern Hemisphere. Through a telescope, it appears as a bright, orange-hued star with a nearby white companion.[10] Parallax measurements indicate this star is located at a distance of about 194 light-years (59 parsecs) from Earth.[1]

Sigma Puppis
Location of σ Puppis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Puppis
Right ascension 07h 29m 13.83049s[1]
Declination −43° 18′ 05.1597″[1]
Apparent magnitude (V) 3.25[2]
Characteristics
Spectral type K5 III[3]
U−B color index +1.77[2]
B−V color index +1.52[2]
Astrometry
Radial velocity (Rv)+87.7[4] km/s
Proper motion (μ) RA: −59.55[1] mas/yr
Dec.: +188.31[1] mas/yr
Parallax (π)16.84 ± 0.15 mas[1]
Distance194 ± 2 ly
(59.4 ± 0.5 pc)
Absolute magnitude (MV)−0.50[5]
Orbit[6]
Period (P)257.8 days
Eccentricity (e)0.17
Periastron epoch (T)20418.6
Argument of periastron (ω)
(secondary)		349.3°
Semi-amplitude (K1)
(primary)		18.6 km/s
Details
σ Pup A
Radius107[7] R☉
Luminosity392[5] L☉
Rotational velocity (v sin i)3.0[8] km/s
Other designations
σ Pup, Sigma Pup, CPD−43  1499, FK5 1194, GC 10040, HD 59717, HIP 36377, HR 2878, SAO 218755, WDS J07292-4318A[9]
Database references
SIMBADdata
A light curve for Sigma Puppis, adapted from Otero (2007)[11]

This is a spectroscopic binary system,[9] consisting of an orbiting pair of stars that have not been individually resolved with a telescope. Their orbital period is 257.8 days and the eccentricity is 0.17.[6] The pair form an eclipsing binary of the Beta Lyrae type and a period of 130.5 days, or one half of their orbital period. The eclipse of the primary component causes a decline of 0.04 of a magnitude, while the secondary eclipse reduces the magnitude by 0.03.[11][12]

The combined stellar classification is K5 III,[3] which matches the spectrum of a giant star. The measured angular diameter of the primary star is 16.71 ± 2.84 mas.[13] At the estimated distance of this system, this yields a physical size of about 107 times the radius of the Sun.[7] The primary component shows the behavior of a slow irregular variable.[11][12]

In addition to its binary components, Sigma Puppis has a more distant companion that has a matching proper motion, suggesting that it may be gravitationally bound to the binary. This magnitude 8.5[10] star is at an angular separation of 22.4 arcseconds with a position angle of 74° from Sigma Puppis, which is equivalent to a projected separation of 1,200 AU.[14] In 1970, American astronomer Olin J. Eggen suggested that Sigma Puppis belonged to a moving group of stars that share a similar motion through space, and thereby a common origin. It served as the eponym for this, the σ Puppis group.[15] The existence of this group was later brought into question.[16]

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 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
  3. ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, Ann Arbor: Dept. of Astronomy, University of Michigan: distributed by University Microfilms International, Bibcode:1978mcts.book.....H
  4. ^ 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
  5. ^ a b 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 Batten, A. H.; Fletcher, J. M.; Mann, P. J. (1978), "Seventh catalogue of the orbital elements of spectroscopic binary systems", Publications of the Dominion Astrophysical Observatory Victoria, 15: 121–295, 150–151, Bibcode:1978PDAO...15..121B
  7. ^ a b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
     
  8. ^ Costa, J. M.; et al. (February 2002), "The tidal effects on the lithium abundance of binary systems with giant component", Astronomy and Astrophysics, 382 (3): 1016–1020, arXiv:astro-ph/0111539, Bibcode:2002A&A...382.1016C, doi:10.1051/0004-6361:20011676, S2CID 17024265
  9. ^ a b "sig Pup -- Spectroscopic binary", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2010-01-05
  10. ^ a b Plotner, Tammy; Mann, Terry (2007), The Night Sky Companion: A Yearly Guide to Sky-Watching, Patrick Moore's Practical Astronomy Series, Springer, p. 156, ISBN 978-0-387-71608-4, retrieved 2012-01-11
  11. ^ a b c Otero, Sebastián A. (October 2007), "New Elements for 54 Eclipsing Binaries", Open European Journal on Variable Stars, 72 (1): 1–19, Bibcode:2007OEJV...72....1O
  12. ^ a b Samus, N. N.; Durlevich, O. V. (February 12, 2009), GCVS Variability Types and Distribution Statistics of Designated Variable Stars According to their Types of Variability, Sternberg Astronomical Institute, Moscow University, retrieved 2012-04-18
  13. ^ Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039
  14. ^ Burnham, Robert (1978), Burnham's celestial handbook: an observer's guide to the universe beyond the solar system, Dover books explaining science, vol. 3 (2nd ed.), Courier Dover Publications, p. 150, ISBN 0-486-23673-0, retrieved 2012-01-11
  15. ^ Eggen, O. J. (June 1971), "The ζ Herculis, σ Puppis, ∈ Indi, and η Cephei Groups of Old Disk Population Stars", Publications of the Astronomical Society of the Pacific, 83 (493): 251, Bibcode:1971PASP...83..251E, doi:10.1086/129119
  16. ^ Taylor, B. J. (October 2000), "A statistical analysis of the metallicities of nine old superclusters and moving groups", Astronomy and Astrophysics, 362: 563–579, Bibcode:2000A&A...362..563T


January 01, 1970
sigma, puppis, latinized, from, puppis, binary, star, system, southern, constellation, puppis, apparent, visual, magnitude, which, bright, enough, visible, naked, night, from, southern, hemisphere, through, telescope, appears, bright, orange, hued, star, with,. Sigma Puppis Latinized from s Puppis is a binary star system in the southern constellation of Puppis It has an apparent visual magnitude of 3 25 2 which is bright enough to be visible to the naked eye at night from the Southern Hemisphere Through a telescope it appears as a bright orange hued star with a nearby white companion 10 Parallax measurements indicate this star is located at a distance of about 194 light years 59 parsecs from Earth 1 Sigma PuppisLocation of s Puppis circled Observation dataEpoch J2000 Equinox J2000 Constellation Puppis Right ascension 07h 29m 13 83049s 1 Declination 43 18 05 1597 1 Apparent magnitude V 3 25 2 Characteristics Spectral type K5 III 3 U B color index 1 77 2 B V color index 1 52 2 AstrometryRadial velocity Rv 87 7 4 km sProper motion m RA 59 55 1 mas yr Dec 188 31 1 mas yrParallax p 16 84 0 15 mas 1 Distance194 2 ly 59 4 0 5 pc Absolute magnitude MV 0 50 5 Orbit 6 Period P 257 8 daysEccentricity e 0 17Periastron epoch T 20418 6Argument of periastron w secondary 349 3 Semi amplitude K1 primary 18 6 km s Detailss Pup ARadius107 7 R Luminosity392 5 L Rotational velocity v sin i 3 0 8 km s Other designationss Pup Sigma Pup CPD 43 1499 FK5 1194 GC 10040 HD 59717 HIP 36377 HR 2878 SAO 218755 WDS J07292 4318A 9 Database referencesSIMBADdata A light curve for Sigma Puppis adapted from Otero 2007 11 This is a spectroscopic binary system 9 consisting of an orbiting pair of stars that have not been individually resolved with a telescope Their orbital period is 257 8 days and the eccentricity is 0 17 6 The pair form an eclipsing binary of the Beta Lyrae type and a period of 130 5 days or one half of their orbital period The eclipse of the primary component causes a decline of 0 04 of a magnitude while the secondary eclipse reduces the magnitude by 0 03 11 12 The combined stellar classification is K5 III 3 which matches the spectrum of a giant star The measured angular diameter of the primary star is 16 71 2 84 mas 13 At the estimated distance of this system this yields a physical size of about 107 times the radius of the Sun 7 The primary component shows the behavior of a slow irregular variable 11 12 In addition to its binary components Sigma Puppis has a more distant companion that has a matching proper motion suggesting that it may be gravitationally bound to the binary This magnitude 8 5 10 star is at an angular separation of 22 4 arcseconds with a position angle of 74 from Sigma Puppis which is equivalent to a projected separation of 1 200 AU 14 In 1970 American astronomer Olin J Eggen suggested that Sigma Puppis belonged to a moving group of stars that share a similar motion through space and thereby a common origin It served as the eponym for this the s Puppis group 15 The existence of this group was later brought into question 16 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 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 a b Houk Nancy 1978 Michigan catalogue of two dimensional spectral types for the HD stars Ann Arbor Dept of Astronomy University of Michigan distributed by University Microfilms International Bibcode 1978mcts book H 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 a b 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 Batten A H Fletcher J M Mann P J 1978 Seventh catalogue of the orbital elements of spectroscopic binary systems Publications of the Dominion Astrophysical Observatory Victoria 15 121 295 150 151 Bibcode 1978PDAO 15 121B a b Lang Kenneth R 2006 Astrophysical formulae Astronomy and astrophysics library vol 1 3rd ed Birkhauser ISBN 3 540 29692 1 The radius R is given by 2 R 10 3 59 4 16 71 AU 0 0046491 AU R 213 5 R displaystyle begin aligned 2 cdot R amp frac 10 3 cdot 59 4 cdot 16 71 text AU 0 0046491 text AU R bigodot amp approx 213 5 cdot R bigodot end aligned nbsp Costa J M et al February 2002 The tidal effects on the lithium abundance of binary systems with giant component Astronomy and Astrophysics 382 3 1016 1020 arXiv astro ph 0111539 Bibcode 2002A amp A 382 1016C doi 10 1051 0004 6361 20011676 S2CID 17024265 a b sig Pup Spectroscopic binary SIMBAD Centre de Donnees astronomiques de Strasbourg retrieved 2010 01 05 a b Plotner Tammy Mann Terry 2007 The Night Sky Companion A Yearly Guide to Sky Watching Patrick Moore s Practical Astronomy Series Springer p 156 ISBN 978 0 387 71608 4 retrieved 2012 01 11 a b c Otero Sebastian A October 2007 New Elements for 54 Eclipsing Binaries Open European Journal on Variable Stars 72 1 1 19 Bibcode 2007OEJV 72 1O a b Samus N N Durlevich O V February 12 2009 GCVS Variability Types and Distribution Statistics of Designated Variable Stars According to their Types of Variability Sternberg Astronomical Institute Moscow University retrieved 2012 04 18 Richichi A Percheron I Khristoforova M February 2005 CHARM2 An updated Catalog of High Angular Resolution Measurements Astronomy and Astrophysics 431 2 773 777 Bibcode 2005A amp A 431 773R doi 10 1051 0004 6361 20042039 Burnham Robert 1978 Burnham s celestial handbook an observer s guide to the universe beyond the solar system Dover books explaining science vol 3 2nd ed Courier Dover Publications p 150 ISBN 0 486 23673 0 retrieved 2012 01 11 Eggen O J June 1971 The z Herculis s Puppis Indi and h Cephei Groups of Old Disk Population Stars Publications of the Astronomical Society of the Pacific 83 493 251 Bibcode 1971PASP 83 251E doi 10 1086 129119 Taylor B J October 2000 A statistical analysis of the metallicities of nine old superclusters and moving groups Astronomy and Astrophysics 362 563 579 Bibcode 2000A amp A 362 563T Retrieved from https en wikipedia org w index php title Sigma Puppis amp oldid 1215917292, wikipedia, wiki, book, books, library,

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