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Sigma Ophiuchi

October 20, 2023

Sigma Ophiuchi, Latinized from σ Ophiuchi, is a single,[12] orange-hued star in the equatorial constellation Ophiuchus. Its apparent visual magnitude is 4.31,[2] which is bright enough to be faintly visible to the naked eye. The annual parallax shift of 3.62 mas as seen from Earth provides a distance estimate of roughly 900 light years. It is moving closer to the Sun with a radial velocity of −28 km/s.[5]

σ Ophiuchi
Location of σ Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 17h 26m 30.8806s[1]
Declination 4° 08′ 25.2876″[1]
Apparent magnitude (V) 4.31[2] (4.25 - 4.51[3])
Characteristics
Spectral type K2 III[4]
U−B color index +1.57[2]
B−V color index +1.51[2]
Variable type suspected[3]
Astrometry
Radial velocity (Rv)-27.81[5] km/s
Proper motion (μ) RA: +1.459[6] mas/yr
Dec.: +6.760[6] mas/yr
Parallax (π)3.7578 ± 0.1559 mas[6]
Distance870 ± 40 ly
(270 ± 10 pc)
Absolute magnitude (MV)-2.85[7]
Details
Mass4.87[8] M☉
Radius94[9] R☉
Luminosity1,995 - 2,032[9] L☉
Surface gravity (log g)1.52[10] cgs
Temperature3,986±170[9] K
Metallicity [Fe/H]-0.07[8] dex
Rotational velocity (v sin i)4.2[11] km/s
Other designations
σ Oph, 49 Ophiuchi, NSV 8664, BD+04° 3422, FK5 1459, GC 23621, HD 157999, HIP 85355, HR 6498, SAO 122387, 2MASS J17263087+0408252
Database references
SIMBADdata

This is an evolved giant star of type K with a stellar classification of K2 III.[4] Wittkowski et al. (2017) consider it to have a luminosity class of II-III, suggesting it is in a transitional zone between giants and supergiant stars.[13] It has around 5 times the mass of the Sun and 73 times the Sun's radius. The star is radiating 2,047 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,540 K.[8]

References Edit

  1. ^ a b 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. ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  4. ^ a b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 05: 0. Bibcode:1999MSS...C05....0H.
  5. ^ a b Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data". Astronomy & Astrophysics. 430: 165–186. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
  6. ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  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. Vizier catalog entry
  8. ^ a b c Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015). "Precise radial velocities of giant stars". Astronomy & Astrophysics. 574: A116. arXiv:1412.4634. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360. hdl:10722/215277. S2CID 59334290. Vizier catalog entry
  9. ^ a b c Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal. 158 (1): 20. arXiv:1905.03744. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd. S2CID 148571616.
  10. ^ Hekker, S.; Meléndez, J. (2007). "Precise radial velocities of giant stars". Astronomy and Astrophysics. 475 (3): 1003. arXiv:0709.1145. Bibcode:2007A&A...475.1003H. doi:10.1051/0004-6361:20078233. S2CID 10436552.
  11. ^ De Medeiros, J. R.; Mayor, M. (1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433. arXiv:astro-ph/0608248. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401. Vizier catalog entry
  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. ^ Wittkowski, M.; et al. (January 2017), "VLTI/AMBER spectro-interferometry of the late-type supergiants V766 Cen (=HR 5171 A), σ Oph, BM Sco, and HD 206859", Astronomy & Astrophysics, 597: 16, arXiv:1610.01927, Bibcode:2017A&A...597A...9W, doi:10.1051/0004-6361/201629349, S2CID 55679854, A9.

October 20, 2023
sigma, ophiuchi, latinized, from, ophiuchi, single, orange, hued, star, equatorial, constellation, ophiuchus, apparent, visual, magnitude, which, bright, enough, faintly, visible, naked, annual, parallax, shift, seen, from, earth, provides, distance, estimate,. Sigma Ophiuchi Latinized from s Ophiuchi is a single 12 orange hued star in the equatorial constellation Ophiuchus Its apparent visual magnitude is 4 31 2 which is bright enough to be faintly visible to the naked eye The annual parallax shift of 3 62 mas as seen from Earth provides a distance estimate of roughly 900 light years It is moving closer to the Sun with a radial velocity of 28 km s 5 s OphiuchiLocation of s Ophiuchi circled Observation dataEpoch J2000 Equinox J2000Constellation OphiuchusRight ascension 17h 26m 30 8806s 1 Declination 4 08 25 2876 1 Apparent magnitude V 4 31 2 4 25 4 51 3 CharacteristicsSpectral type K2 III 4 U B color index 1 57 2 B V color index 1 51 2 Variable type suspected 3 AstrometryRadial velocity Rv 27 81 5 km sProper motion m RA 1 459 6 mas yr Dec 6 760 6 mas yrParallax p 3 7578 0 1559 mas 6 Distance870 40 ly 270 10 pc Absolute magnitude MV 2 85 7 DetailsMass4 87 8 M Radius94 9 R Luminosity1 995 2 032 9 L Surface gravity log g 1 52 10 cgsTemperature3 986 170 9 KMetallicity Fe H 0 07 8 dexRotational velocity v sin i 4 2 11 km sOther designationss Oph 49 Ophiuchi NSV 8664 BD 04 3422 FK5 1459 GC 23621 HD 157999 HIP 85355 HR 6498 SAO 122387 2MASS J17263087 0408252Database referencesSIMBADdataThis is an evolved giant star of type K with a stellar classification of K2 III 4 Wittkowski et al 2017 consider it to have a luminosity class of II III suggesting it is in a transitional zone between giants and supergiant stars 13 It has around 5 times the mass of the Sun and 73 times the Sun s radius The star is radiating 2 047 times the Sun s luminosity from its enlarged photosphere at an effective temperature of 4 540 K 8 References Edit a b Brown A G A et al Gaia collaboration August 2018 Gaia Data Release 2 Summary of the contents and survey properties Astronomy amp Astrophysics 616 A1 arXiv 1804 09365 Bibcode 2018A amp A 616A 1G doi 10 1051 0004 6361 201833051 Gaia DR2 record for this source at VizieR a b c d Ducati J R 2002 VizieR Online Data Catalog Catalogue of Stellar Photometry in Johnson s 11 color system CDS ADC Collection of Electronic Catalogues 2237 Bibcode 2002yCat 2237 0D a b Samus N N Durlevich O V et al 2009 VizieR Online Data Catalog General Catalogue of Variable Stars Samus 2007 2013 VizieR On line Data Catalog B GCVS Originally Published in 2009yCat 102025S 1 Bibcode 2009yCat 102025S a b Houk N Swift C 1999 Michigan catalogue of two dimensional spectral types for the HD Stars Vol 5 Michigan Spectral Survey 05 0 Bibcode 1999MSS C05 0H a b Famaey B Jorissen A Luri X Mayor M Udry S Dejonghe H Turon C 2005 Local kinematics of K and M giants from CORAVEL Hipparcos Tycho 2 data Astronomy amp Astrophysics 430 165 186 arXiv astro ph 0409579 Bibcode 2005A amp A 430 165F doi 10 1051 0004 6361 20041272 S2CID 17804304 a b c Brown A G A et al Gaia collaboration 2021 Gaia Early Data Release 3 Summary of the contents and survey properties Astronomy amp Astrophysics 649 A1 arXiv 2012 01533 Bibcode 2021A amp A 649A 1G doi 10 1051 0004 6361 202039657 S2CID 227254300 Erratum doi 10 1051 0004 6361 202039657e Gaia EDR3 record for this source at VizieR 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 Vizier catalog entry a b c Reffert Sabine Bergmann Christoph Quirrenbach Andreas Trifonov Trifon Kunstler Andreas 2015 Precise radial velocities of giant stars Astronomy amp Astrophysics 574 A116 arXiv 1412 4634 Bibcode 2015A amp A 574A 116R doi 10 1051 0004 6361 201322360 hdl 10722 215277 S2CID 59334290 Vizier catalog entry a b c Messineo M Brown A G A 2019 A Catalog of Known Galactic K M Stars of Class I Candidate Red Supergiants in Gaia DR2 The Astronomical Journal 158 1 20 arXiv 1905 03744 Bibcode 2019AJ 158 20M doi 10 3847 1538 3881 ab1cbd S2CID 148571616 Hekker S Melendez J 2007 Precise radial velocities of giant stars Astronomy and Astrophysics 475 3 1003 arXiv 0709 1145 Bibcode 2007A amp A 475 1003H doi 10 1051 0004 6361 20078233 S2CID 10436552 De Medeiros J R Mayor M 1999 A catalog of rotational and radial velocities for evolved stars Astronomy and Astrophysics Supplement Series 139 3 433 arXiv astro ph 0608248 Bibcode 1999A amp AS 139 433D doi 10 1051 aas 1999401 Vizier catalog entry 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 Wittkowski M et al January 2017 VLTI AMBER spectro interferometry of the late type supergiants V766 Cen HR 5171 A s Oph BM Sco and HD 206859 Astronomy amp Astrophysics 597 16 arXiv 1610 01927 Bibcode 2017A amp A 597A 9W doi 10 1051 0004 6361 201629349 S2CID 55679854 A9 Retrieved from https en wikipedia org w index php title Sigma Ophiuchi amp oldid 1154748924, wikipedia, wiki, book, books, library,

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