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{{short description|Star in the constellation Ursa Major}}
{{starbox begin
|name= 56 Ursae Majoris}}
{{Starbox begin|name=56 Ursae Majoris}}
{{starbox observe
{{Starbox observe
|epoch=[[J2000]]
|epoch=[[J2000]]
|constell= [[Ursa Major (constellation)|Ursa Major]]
|constell=[[Ursa Major]]
|ra={{RA|11|22|49.58373}}<ref name=HIP>{{cite journal|title=Validation of the new Hipparcos reduction|url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL|author=van Leeuwen, F. |journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357|s2cid = 18759600}}</ref>
|ra= {{RA|11|22|49.58373}} <ref name=SIMBAD/>
|dec= {{DEC|+43|28|57.2767}} <ref name=SIMBAD/>
|dec={{DEC|+43|28|57.7267}}<ref name=HIP/>
|appmag_v=5.03<ref name=Ducati>{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|author1=Ducati, J. R.|year=2002}}</ref>
}}
}}
{{starbox character
{{Starbox character
|class=G7IIIBa0.3<ref>{{cite journal|bibcode=1991AJ....101.2229L|title=Taxonomy of barium stars|author=Lu, Phillip K.|journal=Astronomical Journal|volume=101|pages=2229–2254|date=1991|doi=10.1086/115845|doi-access=free}}</ref>
|type= G7.5IIIa <ref name=SIMBAD>SIMBAD, [http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=56+Ursae+Majoris&submit=SIMBAD+search 56 Ursae Majoris] (accessed 3 March 2013)</ref>
|b-v=+1.02<ref name=Fernie>{{cite journal|bibcode=1983ApJS...52....7F|doi=10.1086/190856|title=New UBVRI photometry for 900 supergiants|author=Fernie, J. D.|journal=Astrophysical Journal Supplement Series|volume=52|issue=7–22|date=1983|page=7|doi-access=free}}</ref>
|u-b=+0.82<ref name=Fernie/>
}}
}}
{{Starbox astrometry
⚫
{{starbox reference
|radial_v=1.01 ± 0.05<ref name=SB9>{{cite journal|title=S<sub>B<sup>9</sup></sub>: The ninth catalogue of spectroscopic binary orbits|display-authors=1|author1=Pourbaix, D.|author2=Tokovinin, A. A.|author3=Batten, A. H.|author4=Fekel, F. C.|author5=Hartkopf, W. I.|author6=Levato, H.|author7=Morrell, N. I.|author8=Torres, G.|author9=Udry, S.|journal=Astronomy and Astrophysics|volume=424|issue=2|pages=727–732|year=2004|doi=10.1051/0004-6361:20041213|arxiv=astro-ph/0406573|bibcode=2004A&A...424..727P|s2cid=119387088}}</ref>
|prop_mo_ra=-37.42<ref name=HIP/>
|prop_mo_dec=-14.26<ref name=HIP/>
|parallax=6.12
|p_error=0.27
|parallax_footnote=<ref name=HIP/>
}}
{{Starbox orbit
|reference=<ref name=Escorza/>
|period_unitless={{val|16911|438|401}} d
|periastron={{val|2468401|432|385}}
|eccentricity={{val|0.562|0.012|0.012}}
|axis_unitless={{val|22.9|1.0|1.1}} au
|periarg={{val|286|2.3|2.3}}
|node={{val|60|3|3}}
|inclination={{val|68|3.6|3.4}}
}}
{{Starbox detail
|source=<ref name=Escorza/>
|component1=56 UMa A
|mass=4.3 ± 0.2
|temperature=4917 ± 34
|gravity=2.3 ± 0.6
|metal_fe−0.05
|component2=56 UMa B
|mass2={{val|1.31|0.11|0.12}}
}}
{{Starbox catalog
|names={{odlist|BD=+44° 2083|FK5=2908|HD=98839|HIP=55560|HR=4392|SAO=43719}}
}}
⚫
{{Starbox reference
|Simbad=56+UMa
|Simbad=56+UMa
}}
}}
{{starbox end}}
{{Starbox end}}
'''56 Ursae Majoris''' ('''56 UMa''') is a [[star]] in the [[constellation]] [[Ursa Major (constellation)|Ursa Major]]. Its [[apparent magnitude]] is 5.03.<ref name=Ducati/> It is a single-lined spectroscopic binary with an [[orbital period]] of about 45 years.<ref name=SB9/> The companion star is likely a heavy [[neutron star]] born by a [[supernova]] that exploded around 100,000 years ago.<ref name=Escorza>{{cite journal| arxiv=2301.06531 |title = A neutron star candidate in the long-period binary 56 UMa| bibcode=2023A&A...670L..14E | last1=Escorza | first1=A. | last2=Karinkuzhi | first2=D. | last3=Jorissen | first3=A. | last4=Van Eck | first4=S. | last5=Schmelz | first5=J. T. | last6=Verschuur | first6=G. L. | last7=Boffin | first7=H. M. J. | last8=De Rosa | first8=R. J. | last9=Van Winckel | first9=H. | journal=Astronomy and Astrophysics | year=2023 | volume=670 | pages=L14 | doi=10.1051/0004-6361/202245796 | s2cid=255941814 }}</ref>

'''56 Ursae Majoris''' ('''56 UMa''') is a [[star]] in the [[constellation]] [[Ursa Major (constellation)|Ursa Major]]. Its [[apparent magnitude]] is 4.99.


==References==
==References==
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{{Stars of Ursa Major}}
{{Stars of Ursa Major}}


[[Category:Ursa Major (constellation)]]
[[Category:Ursa Major]]
[[Category:G-type giants]]
[[Category:G-type giants]]
[[Category:Barium stars]]
[[Category:Spectroscopic binaries]]
[[Category:Flamsteed objects|Ursae Majoris, 56]]
[[Category:Flamsteed objects|Ursae Majoris, 56]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|098839]]
[[Category:Hipparcos objects|055560]]
[[Category:Bright Star Catalogue objects|4392]]




Latest revision as of 06:53, 13 August 2023

56 Ursae Majoris
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 11h 22m 49.58373s[1]
Declination +43° 28′ 57.7267″[1]
Apparent magnitude (V) 5.03[2]
Characteristics
Spectral type G7IIIBa0.3[3]
U−B color index +0.82[4]
B−V color index +1.02[4]
Astrometry
Radial velocity (Rv)1.01 ± 0.05[5] km/s
Proper motion (μ) RA: -37.42[1] mas/yr
Dec.: -14.26[1] mas/yr
Parallax (π)6.12 ± 0.27 mas[1]
Distance530 ± 20 ly
(163 ± 7 pc)
Orbit[6]
Period (P)16911+438
−401 d
Semi-major axis (a)22.9+1.0
−1.1 au
Eccentricity (e)0.562+0.012
−0.012
Inclination (i)68+3.6
−3.4°
Longitude of the node (Ω)60+3
−3°
Periastron epoch (T)2468401+432
−385
Argument of periastron (ω)
(secondary)		286+2.3
−2.3°
Details[6]
56 UMa A
Mass4.3 ± 0.2 M☉
Surface gravity (log g)2.3 ± 0.6 cgs
Temperature4917 ± 34 K
56 UMa B
Mass1.31+0.11
−0.12 M☉
Other designations
BD+44° 2083, FK5 2908, HD 98839, HIP 55560, HR 4392, SAO 43719
Database references
SIMBADdata

56 Ursae Majoris (56 UMa) is a star in the constellation Ursa Major. Its apparent magnitude is 5.03.[2] It is a single-lined spectroscopic binary with an orbital period of about 45 years.[5] The companion star is likely a heavy neutron star born by a supernova that exploded around 100,000 years ago.[6]

References

[edit]
  1. ^ a b c d e van Leeuwen, F. (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 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. ^ Lu, Phillip K. (1991). "Taxonomy of barium stars". Astronomical Journal. 101: 2229–2254. Bibcode:1991AJ....101.2229L. doi:10.1086/115845.
  4. ^ a b Fernie, J. D. (1983). "New UBVRI photometry for 900 supergiants". Astrophysical Journal Supplement Series. 52 (7–22): 7. Bibcode:1983ApJS...52....7F. doi:10.1086/190856.
  5. ^ a b Pourbaix, D.; et al. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID 119387088.
  6. ^ a b c Escorza, A.; Karinkuzhi, D.; Jorissen, A.; Van Eck, S.; Schmelz, J. T.; Verschuur, G. L.; Boffin, H. M. J.; De Rosa, R. J.; Van Winckel, H. (2023). "A neutron star candidate in the long-period binary 56 UMa". Astronomy and Astrophysics. 670: L14. arXiv:2301.06531. Bibcode:2023A&A...670L..14E. doi:10.1051/0004-6361/202245796. S2CID 255941814.


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