Upsilon Lupi

Short description: Star in the constellation Lupus

Upsilon Lupi

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The location of Upsilon Lupi (υ) in the constellation of Lupus (shown as a red target's bullseye).

Observation data
Equinox J2000.0]] (ICRS)
Constellation | Lupus
Right ascension |  15h 24m 45.00855s[1]
Declination | −39° 42′ 36.9524″[1]
Apparent magnitude (V) | 5.37[2] (5.37 + 10.90)[3]
Characteristics
Spectral type | A0p Si[4]
B−V color index | −0.11[2]
Astrometry
Radial velocity (Rv)| −7.6±2.8[5] km/s
Proper motion (μ)|  RA: −26.10[1] mas/yr
Dec.: −54.77[1] mas/yr
Parallax (π)| 8.02 ± 0.62[1] mas
Distance| 410 ± 30 ly
(125 ± 10 pc)
Absolute magnitude (MV)| −0.10[6]
Details
υ Lup A
Luminosity| 113[7] L☉
Temperature| 10,049[7] K
Rotational velocity (v sin i)| 0[8] km/s
Other designations

υ Lup, CD−39°9827, HD 136933, HIP 75439, HR 5719, SAO 206597[9]

Database references
SIMBAD| data

Upsilon Lupi, Latinized from υ Lupi, is a star system in the southern constellation of Lupus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.37.[2] Based upon an annual parallax shift of 8.02[1] mas as seen from Earth, it is located around 410 light years from the Sun. The two components of Upsilon Lupi share a common proper motion through space and most likely form a wide binary star system.[10] As of 1945, the pair had an angular separation of 1.50 arc seconds along a position angle of 40°.[3]

The brighter member, component A, is a chemically peculiar Ap star with a stellar classification of A0p Si,[4] where the 'Si' suffix indicates an abnormal abundance of silicon in the star's photosphere. A magnetic field has been detected with a quadratic field strength of (764.7±311.3)×10−4 T.[11] The star is radiating 113 times the solar luminosity from its outer atmosphere at an effective temperature of 10,049 K.[7]

The magnitude 10.9 companion star, component B, has a visual magnitude of 10.90.[3] It may be the source of the X-ray emission detected coming from these coordinates.[12]

## 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.
2. ↑ 2.0 2.1 2.2 Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa 27: 11, Bibcode: 1968MNSSA..27...11C.
3. ↑ 3.0 3.1 3.2 Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M.
4. ↑ 4.0 4.1 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1982mcts.book.....H.
5. ↑ 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, Bibcode: 2012A&A...546A..61D.
6. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
7. ↑ 7.0 7.1 7.2 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
8. ↑ Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory (University of Kyoto), Bibcode: 1970crvs.book.....U.
9. ↑ "ups Lup". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ups+Lup.
10. ↑ 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, Bibcode: 2008MNRAS.389..869E.
11. ↑ Bychkov, V. D. et al. (April 2009), "Catalogue of averaged stellar effective magnetic fields - II. Re-discussion of chemically peculiar A and B stars", Monthly Notices of the Royal Astronomical Society 394 (3): 1338–1350, doi:10.1111/j.1365-2966.2008.14227.x, Bibcode: 2009MNRAS.394.1338B.
12. ↑ 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
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* e

Stars of Lupus

Bayer|

* α
* β
* γ
* δ
* ε
* ζ
* η
* θ
* ι
* κ1
* κ2
* λ
* μ
* ν1
* ν2
* ξ1
* ξ2
* ο
* π
* ρ
* σ
* τ1
* τ2
* υ
* φ1
* φ2
* χ
* ψ1
* ψ2
* ω

Flamsteed|

* 1 (i)
* 2 (f)

Variable|

* RU
* RY
* BR
* EX
* FT
* FW
* GG
* GM
* GQ
* HR
* HX
* HZ
* II
* IM
* KT (d)
* NY
* NZ

HR|

* 5362
* 5364
* 5377
* 5380
* 5401
* 5412
* 5413
* 5426
* 5427
* 5444
* 5450 (a)
* 5457
* 5458
* 5494
* 5495 (b)
* 5498
* 5509
* 5556 (c)
* 5559
* 5566
* 5580
* 5595
* 5607
* 5615
* 5617
* 5625
* 5636
* 5637
* 5642
* 5650
* 5651 (e)
* 5653
* 5663
* 5667
* 5668
* 5682
* 5688
* 5689
* 5696
* 5724 (k)
* 5736
* 5738
* 5742
* 5751
* 5753
* 5767
* 5773
* 5784
* 5790
* 5807
* 5821
* 5822
* 5825 (g)
* 5837 (h)
* 5846
* 5860
* 5862
* 5864
* 5893
* 5916
* 5918
* 5923
* 5929
* 5935
* 5943
* 5952
* 5956
* 5967
* 5970
* 5974
* 5975
* 5991

HD|

* 125809
* 126093
* 126525
* 126759
* 128154
* 129624
* 133399
* 133469
* 133518
* 135430
* 135468
* 136607
* 137785
* 137919
* 138395
* 142527

Gliese|

* Gliese 588

Other|

* He 2-113
* HIP 70849
* Lupus-TR-3
* SAO 206462
* SSSPM J1549-3544
* 4U 1543-47

* List

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