Upsilon Ophiuchi

Short description: Multiple star in the constellation Ophiuchus

Upsilon Ophiuchi

Location of υ Ophiuchi (circled)

Observation data
Equinox J2000.0]] (ICRS)
Constellation | Ophiuchus
Right ascension |  16h 27m 48.18720s[1]
Declination | −8° 22′ 18.2245″[1]
Apparent magnitude (V) | 4.62[2]
Characteristics
Spectral type | kA2hA5VmA5[3]
U−B color index | +0.06[4]
B−V color index | +0.16[4]
Astrometry
Radial velocity (Rv)| −30.60[5] km/s
Proper motion (μ)|  RA: −67.49[1] mas/yr
Dec.: −11.75[1] mas/yr
Parallax (π)| 24.42 ± 0.91[1] mas
Distance| 134 ± 5 ly
(41 ± 2 pc)
Absolute magnitude (MV)| 1.75[2]
Orbit[6]
Primary| Aa
Companion| Ab
Period (P)| 27.218±0.0005 d
Semi-major axis (a)| ≥ 0.0583 astronomical unit|AU
Eccentricity (e)| 0.744±0.002
Periastron epoch (T)| 2,438,914.84±0.01 JD
Argument of periastron (ω)
(secondary)| 333.7±0.7°
Semi-amplitude (K1)
(primary)| 34.9±0.3 km/s
Semi-amplitude (K2)
(secondary)| 41.1±0.3 km/s
Orbit[7]
Primary| A
Companion| B
Period (P)| 82.8±1.4 yr
Semi-major axis (a)| 0.79±0.03″
Eccentricity (e)| 0.45±0.03
Inclination (i)| 31.2±5.7°
Longitude of the node (Ω)| 86.8±6.9°
Periastron epoch (T)| B 1994.1±1.0
Argument of periastron (ω)
(secondary)| 177.9±7.4°
Details
Mass| 1.94[8] M☉
Radius| 1.9[8] R☉
Luminosity| 16.56[2] L☉
Surface gravity (log g)| 4.45[9] cgs
Temperature| 8,364[9] K
Metallicity [Fe/H]| +0.14[2] dex
Rotational velocity (v sin i)| 44[10] km/s
Other designations

Alkarab, υ Oph, 3 Ophiuchi, BD−08°4243, FK5 3299, GC 22134, HD 148367, HIP 80628, HR 6129, SAO 141187, CCDM J16278-0822AB, WDS J16278-0822[11]

Database references
SIMBAD| data

Upsilon Ophiuchi is a triple star[12] system in the equatorial constellation of Ophiuchus. It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.62.[2] The distance to this system is approximately 134 light years based on parallax.[1] It is drifting closer with a radial velocity of −30.6 km/s.[5]

The variable radial velocity of the brighter component was first observed by H. A. Abt in 1961. It is a double-lined spectroscopic binary system with an orbital period of 27.2 days and an eccentricity of 0.74.[6] They have a combined magnitude of 4.71. Both components are similar stars with a combined stellar classification of kA2hA5VmA5, and one or both are Am stars.[3] The third component has an 82.8 year orbit with the inner pair at an eccentricity of 0.45.[7] The system is a source for X-ray emission.[13]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. Vizier catalog entry
2. ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. Vizier catalog entry
3. ↑ 3.0 3.1 Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement 99: 135. doi:10.1086/192182. Bibcode: 1995ApJS...99..135A.
4. ↑ 4.0 4.1 Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers 42 (2): 443. Bibcode: 2014JAVSO..42..443M. Vizier catalog entry
5. ↑ 5.0 5.1 Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication (Carnegie Institution for Science). ISBN 9780598216885. Bibcode: 1953GCRV..C......0W.
6. ↑ 6.0 6.1 Gutmann, F. (1965). "A study of the spectroscopic binary 3nu Ophiuchi (HD 148367)". Publications of the Dominion Astrophysical Observatory Victoria 12: 391–399. Bibcode: 1965PDAO...12..391G.
7. ↑ 7.0 7.1 "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6.
8. ↑ 8.0 8.1 Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics 352: 555–562. Bibcode: 1999A&A...352..555A. Vizier catalog entry
9. ↑ 9.0 9.1 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. doi:10.1088/0004-637X/804/2/146. Bibcode: 2015ApJ...804..146D. Vizier catalog entry
10. ↑ Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H 5050. Bibcode: 1995yCat.5050....0H.
11. ↑ "ups Oph". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ups+Oph.
12. ↑ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. Vizier catalog entry
13. ↑ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics 475 (2): 677–684, doi:10.1051/0004-6361:20077429, Bibcode: 2007A&A...475..677S

* v
* t
* e

Stars of Ophiuchus

Bayer|

* α (Rasalhague)
* β (Cebalrai)
* γ
* δ (Yed Prior)
* ε (Yed Posterior)
* ζ (Han)
* η (Sabik)
* θ
* ι
* κ
* λ (Marfik)
* μ
* ν
* ξ
* ο
* ρ
* σ
* τ
* υ
* φ
* χ
* ψ
* ω

Flamsteed|

* 12
* 14
* 15
* 16
* 18
* 19
* 20
* 21
* 23
* 24
* 26
* 28
* 29
* 30
* 31
* 36 (Guniibuu)
* 37
* 38
* 41
* 43
* 44
* 45
* 50
* 51
* 52
* 53
* 54
* 58
* 61
* 66
* 67
* 68
* 70
* 71
* 72
* 73
* 74
* 24 Sco

Variable|

* U
* V
* X
* Y
* RS
* RV
* RZ
* ST
* SW
* TT
* TW
* UU
* WZ
* XX
* BF
* IX
* KK
* V380
* V426
* V438
* V442
* V445
* V451
* V453
* V502
* V508
* V566
* V567
* V716
* V839
* V841
* V849
* V986
* V1010
* V1054
* V2051
* V2052
* V2076
* V2105
* V2112
* V2113
* V2114
* V2118
* V2126
* V2129
* V2213
* V2214
* V2247
* V2291
* V2292
* V2301
* V2307
* V2324
* V2368
* V2388
* V2393
* V2400
* V2487
* V2502
* V2540
* V2542

HR|

* 5989
* 5990
* 6041
* 6067
* 6096
* 6124
* 6136
* 6137
* 6140
* 6144
* 6179
* 6189
* 6190
* 6193
* 6201
* 6202
* 6235
* 6248
* 6269
* 6284
* 6294
* 6296
* 6302
* 6308
* 6329
* 6340
* 6350
* 6353
* 6354
* 6358
* 6359
* 6361
* 6365
* 6367
* 6372
* 6375
* 6387
* 6390
* 6404
* 6413
* 6428
* 6433
* 6435
* 6439
* 6441
* 6465
* 6472
* 6473
* 6474
* 6476
* 6489
* 6490
* 6494
* 6497
* 6504
* 6507
* 6512
* 6516
* 6520
* 6521
* 6524
* 6532
* 6534
* 6575
* 6577
* 6578
* 6590
* 6593
* 6601
* 6633
* 6639
* 6650
* 6659
* 6667
* 6670
* 6686
* 6689
* 6690
* 6696
* 6706
* 6719
* 6784
* 6797
* 6800
* 6851
* 6857
* 6883
* 6902
* 6925
* 6976
* 6985
* 6987
* 7010

HD|

* 148390
* 148427 (Timir)
* 148531
* 149143
* 149382
* 150052
* 150381
* 150433
* 150493
* 152581 (Mahsati)
* 154088
* 156992
* 157172
* 160042
* 160346
* 164509
* 167162
* 170469
* 171028

Gliese|

* Gliese 673
* GJ 1207

Other|

* Barnard's Star

* AS 239
* BD -9 4395
* COROT-6
* DoAr 21
* GRO J1719-24
* GRS 1739-278
* GX 1+4
* GX 9+9
* H 1705-250
* Hen 3-1341
* IRAS 16293−2422
* K2-32
* LS IV -1 2
* 2MASS J16452211-1319516
* MXB 1659-29
* Nova Ophiuchi 1993
* PG 1627-017
* PSR B1929+10
* TOI-677
* Van Biesbroeck 8
* VVV BD001
* WISEP J180026.60+013453.1
* Wolf 635
* Wolf 1061
* XTE J1739-285

* List

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/Upsilon Ophiuchi. Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:Upsilon_Ophiuchi&oldid=3424631"
*[RA:]: Right Ascension
*[Dec.:]: Declination
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template