Astronomy:53 Ophiuchi

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Short description: Star system in the constellation Ophiuchus
53 Ophiuchi
Observation data
Equinox J2000.0]] (ICRS)
Constellation Ophiuchus
Right ascension  17h 34m 36.69409s[1]
Declination +09° 35′ 12.1005″[1]
Apparent magnitude (V) 5.80[2] (5.82 + 7.8)[3]
Characteristics
Spectral type A2 V + A8 IV[4]
Astrometry
53 Oph A
Radial velocity (Rv)−13.9±2.9[5] km/s
Proper motion (μ) RA: +2.126[1] mas/yr
Dec.: −8.530[1] mas/yr
Parallax (π)8.8060 ± 0.0978[1] mas
Distance370 ± 4 ly
(114 ± 1 pc)
53 Oph B
Proper motion (μ) RA: +1.794[6] mas/yr
Dec.: −8.148[6] mas/yr
Parallax (π)8.8979 ± 0.0413[6] mas
Distance367 ± 2 ly
(112.4 ± 0.5 pc)
Details
53 Oph Aa
Mass2.50±0.05[7] M
Radius1.7[8] R
Luminosity56.4+5.3
−4.9
[7] L
Surface gravity (log g)3.90[9] cgs
Temperature9,311+173
−170
[7] K
Metallicity [Fe/H]0.21[9] dex
Rotational velocity (v sin i)29[7] km/s
53 Oph B
Radius1.72+0.06
−0.03
[6] R
Luminosity7.74±0.05[6] L
Temperature7,344+124
−152
[6] K
Rotational velocity (v sin i)140[4] km/s
Other designations
f Oph, 53 Oph, HD 159480, HIP 85998, HR 6548, WDS J17346+0935[10]
53 Oph A: BD+09°3424, GC 23824, SAO 122526[10]
53 Oph B: BD+09°3423, GC 23823, SAO 122525[11]
Database references
SIMBADdata

53 Ophiuchi is a multiple star system in the equatorial constellation of Ophiuchus. It is visible to the naked eye as a faint star with a combined apparent visual magnitude of 5.80.[3] Located around 370 light years distant from the Sun based on parallax,[1] it is moving closer to the Earth with a heliocentric radial velocity of −14 km/s.[5] As of 2011, the visible components had an angular separation of 41.28 along a position angle of 190°.[12] The primary may itself be a close binary system with a separation of 0.3692″ and a magnitude difference of 3.97 at an infrared wavelength of 562 nm.[13]

The magnitude 5.82[3] primary, designated component Aa, is an A-type main-sequence star with a stellar classification of A2 V.[4] It has 2.5[7] times the mass of the Sun and about 1.7[8] times the Sun's radius. The star is radiating 56 times the Sun's luminosity from its photosphere at an effective temperature of 9,311 K.[7] The widely spaced secondary, designated component B, is a magnitude 7.8[3] A-type subgiant star with a class of A8 IV.[4]

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode2012AstL...38..331A. 
  3. 3.0 3.1 3.2 3.3 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode2008MNRAS.389..869E. 
  4. 4.0 4.1 4.2 4.3 Levato, H. (1975), "Rotational velocities and spectral types for a sample of binary systems", Astronomy and Astrophysics 19: 91, Bibcode1975A&AS...19...91L. 
  5. 5.0 5.1 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, doi:10.1051/0004-6361/201219219, A61, Bibcode2012A&A...546A..61D. 
  6. 6.0 6.1 6.2 6.3 6.4 6.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  7. 7.0 7.1 7.2 7.3 7.4 7.5 Zorec, J.; Royer, F.; Asplund, Martin; Cassisi, Santi; Ramirez, Ivan; Melendez, Jorge; Bensby, Thomas; Feltzing, Sofia (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode2012A&A...537A.120Z. 
  8. 8.0 8.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367 (2): 521–524, doi:10.1051/0004-6361:20000451, Bibcode2001A&A...367..521P. 
  9. 9.0 9.1 Lemke, M. (November 1989), "Abundance anomalies in main sequence A stars. I. Iron and titanium", Astronomy and Astrophysics 225: 125–136, Bibcode1989A&A...225..125L. 
  10. 10.0 10.1 "f Oph". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=f+Oph. 
  11. "BD+09 3423". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=BD%2B09+3423. 
  12. Mason, Brian D. et al. (August 2011), "Speckle Interferometry at the U.S. Naval Observatory. XVII.", The Astronomical Journal 142 (2): 4, doi:10.1088/0004-6256/142/2/46, 46, Bibcode2011AJ....142...46M. 
  13. Horch, Elliott P. et al. (February 2011), "Observations of Binary Stars with the Differential Speckle Survey Instrument. II. Hipparcos Stars Observed in 2010 January and June", The Astronomical Journal 141 (2): 13, doi:10.1088/0004-6256/141/2/45, 45, Bibcode2011AJ....141...45H.