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{{Short description|Binary star in the constellation Hercules}}
'''Rho Herculis''' (ρ Her, ρ Herculis) is a [[binary star]] in the constellation [[Hercules (constellation)|Hercules]] consisting of the components [[Rho1 Herculis|rho<sup>1</sup> Herculis]] and [[Rho2 Herculis|rho<sup>2</sup> Herculis]].
{{Starbox begin|name=Rho Herculis}}
{{Starbox observe 2s
|epoch=[[J2000]]
⚫
|constell=[[Hercules (constellation)|Hercules]]
|component1=ρ Her A
|ra1={{RA|17|23|40.972}}<ref name=TYC2>{{cite journal|title=The Tycho-2 catalogue of the 2.5 million brightest stars|author=Høg, E.|display-authors=etal|date=2000|journal=Astronomy and Astrophysics|volume=355|pages=L27–L30|bibcode=2000A&A...355L..27H}}</ref>
|dec1={{DEC|+37|08|45.33}}<ref name=TYC2/>
|appmag_v1=4.510<ref name=TYC2/>
|component2=ρ Her B
|ra2={{RA|17|23|40.718}}
|dec2={{DEC|+37|08|48.44}}<ref name=TYC2/>
|appmag_v2=5.398<ref name=TYC2/>
}}
{{Starbox character
|component1=ρ Her A
|class=A0IIIpHgMn<ref name=Abt>{{cite journal|bibcode=1995ApJS...99..135A|doi=10.1086/192182|title=The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars|journal=The Astrophysical Journal Supplement Series|volume=99|pages=135|year=1995|last1=Abt|first1=Helmut A.|last2=Morrell|first2=Nidia I.|doi-access=free}}</ref>
|b-v=+0.00<ref name=Johnson>{{cite journal|title=UBVRIJKL Photometry of the Bright Stars|author1=Johnson, H. L.|journal=Communications of the Lunar and Planetary Laboratory|volume=4|pages=99|date=1966|bibcode=1966CoLPL...4...99J}}</ref>
|u-b=−0.06<ref name=Johnson/>
|component2=ρ Her B
|class2=B9.5IVn<ref name=Abt/>
}}
{{Starbox astrometry
|component1=ρ Her A
|radial_v=−21.0 ± 2<ref name=GCRV>{{cite journal|title=General catalogue of stellar radial velocities|journal=Carnegie Institute Washington D.C. Publication|pages=0|author=Wilson, Ralph Elmer|date=1953|bibcode=1953GCRV..C......0W}}</ref>
|prop_mo_ra=−38.6<ref name=UCAC4>{{cite journal|author1=Zacharias, N.|title=The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)|journal=VizieR On-line Data Catalog|date=2012|bibcode=2012yCat.1322....0Z}}</ref>
|prop_mo_dec=9.2<ref name=UCAC4/>
|parallax=8.3380
|p_error=0.3358
|parallax_footnote=<ref name=dr2a>{{cite DR2|1337345927125084416}}</ref>
|component2=ρ Her B
|radial_v2=−19.3 ± 2<ref name=GCRV/>
|prop_mo_ra2=−38.6<ref name=TYC2/>
|prop_mo_dec2=9.2<ref name=TYC2/>
|parallax2=9.0354
|p_error2=0.1135
|parallax_footnote2=<ref name=dr2b>{{cite DR2|1337345922829546752}}</ref>
}}
{{Starbox detail
|component1=A
|mass=4.00/2.93<ref name=msc>{{cite web|url=http://www.ctio.noao.edu/~atokovin/stars/stars.php?cat=HD&number=157779|title=Multiple Star Catalog|access-date=2018-11-30|website=Cerro Tololo Inter-American Observatory|archive-date=2018-12-01|archive-url=https://web.archive.org/web/20181201005235/http://www.ctio.noao.edu/~atokovin/stars/stars.php?cat=HD&number=157779|url-status=dead}}</ref>
|radius=
|temperature=9,118<ref name=dr2a/>
|luminosity=
|gravity=
|rotational_velocity=75<ref name=royer>{{cite journal|bibcode=2002A&A...393..897R|title=Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin I|journal=Astronomy and Astrophysics|volume=393|issue=3|pages=897–911|last1=Royer|first1=F.|last2=Grenier|first2=S.|last3=Baylac|first3=M. -O.|last4=Gómez|first4=A. E.|last5=Zorec|first5=J.|year=2002|doi=10.1051/0004-6361:20020943 |arxiv=astro-ph/0205255|doi-access=free}}</ref>
|age_myr=
|component2 = B
|mass2=3.27<ref name=msc/>
|temperature2=8,755<ref name=dr2b/>
|rotational_velocity2=291<ref name=royer/>
|gravity2=3.6<ref name=gebran>{{cite journal|bibcode=2016A&A...589A..83G|title=A new method for the inversion of atmospheric parameters of A/Am stars|journal=Astronomy and Astrophysics|volume=589|pages=A83|last1=Gebran|first1=M.|last2=Farah|first2=W.|last3=Paletou|first3=F.|last4=Monier|first4=R.|last5=Watson|first5=V.|year=2016|doi=10.1051/0004-6361/201528052|arxiv=1603.01146|s2cid=118549566}}</ref>
|metal_fe=0.0<ref name=gebran/>
}}
{{Starbox catalog
|names={{odlist|ADS=10526 AB|CCDM=J17236+3708AB|BD=+37° 2878|HIP=85112}}
|component1=ρ Her A
|names1={{odlist|HD=157779|HR=6485|SAO=66001}}
|component2=ρ Her B
|names2={{odlist|HD=157778|HR=6484|SAO=66000}}
}}
{{Starbox reference
|Simbad=rho+Her|sn=ρ Her
|Simbad2=rho+Her+A|sn2=ρ Her A
|Simbad3=rho+Her+B|sn3=ρ Her B
}}
{{Starbox end}}
'''Rho Herculis''' ('''ρ Her''', '''ρ Herculis''') is a [[double star]] in the [[constellation]] of [[Hercules (constellation)|Hercules]]. The [[apparent magnitude]]s of the components are 4.510 and 5.398, respectively. [[Stellar parallax|Parallax]] measurements published in [[Gaia Data Release 2]] put the system at some 360-390 light-years (111-121 parsecs) away.


The two stars of Rho Herculis are separated by four arcseconds, and are known as Rho Herculis A and B, respectively. A is an [[A-type star|A-type]] [[giant star]], while B is a [[B-type star|B-type]] [[subgiant star]].<ref name=Abt/> They are also referred to, rarely, as Rho<sup>1</sup> Herculis and Rho<sup>2</sup> Herculis. Rho Herculis A is itself a close binary which has been resolved using [[speckle interferometry]], with the two components separated by {{val|0.252|ul="}}.<ref name=mason>{{cite journal|bibcode=2009AJ....137.3358M|title=The High Angular Resolution Multiplicity of Massive Stars|journal=The Astronomical Journal|volume=137|issue=2|pages=3358|last1=Mason|first1=Brian D.|last2=Hartkopf|first2=William I.|last3=Gies|first3=Douglas R.|last4=Henry|first4=Todd J.|last5=Helsel|first5=John W.|year=2009|doi=10.1088/0004-6256/137/2/3358|arxiv=0811.0492|s2cid=119268845}}</ref>
⚫
{{Stars of Hercules}}


The two visual components have very similar spectral types, between A0 and B9. Rho Herculis A is generally assigned a [[giant star|giant]] [[luminosity class]], with Rho Herculis B most often considered to be a [[main sequence]] star.<ref name=skiff>{{cite journal|bibcode=2014yCat....1.2023S|title=VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016)|journal=VizieR On-line Data Catalog|last1=Skiff|first1=B. A.|year=2014}}</ref> Rho Herculis A has been considered to be an [[Ap star]], with unusually strong silicon or mercury and manganese [[absorption line]]s in its spectrum,<ref name=Abt/><ref name=abt>{{cite journal|bibcode=1984ApJ...276..266A|title=The nature of the visual companions of AP and AM stars|journal=The Astrophysical Journal|volume=276|pages=266|last1=Abt|first1=H. A.|last2=Cardona|first2=O.|year=1984|doi=10.1086/161610}}</ref> but this is now considered to be dubious.<ref name=renson>{{cite journal|bibcode= 2009A&A...498..961R |title= Catalogue of Ap, HgMn and Am stars |journal= Astronomy and Astrophysics |volume= 498 |issue= 3 |pages= 961 |last1= Renson |first1= P. |last2= Manfroid |first2= J. |year= 2009 |doi= 10.1051/0004-6361/200810788 |doi-access= free }}</ref>
⚫
[[Category:Bayer objects]]
⚫
[[Category:Hercules (constellation)]]


==References==
{{reflist}}


⚫
{{Stars of Hercules|state=collapsed}}
{{star-stub}}

{{DEFAULTSORT:Rho Herculis}}
[[Category:Hercules (constellation)]]
[[Category:A-type giants]]
[[Category:B-type subgiants]]
[[Category:Double stars]]
⚫
[[Category:Bayer objects|Herculis, Rho]]
[[Category:Flamsteed objects|Herculis, 075]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|157778 9]]
[[Category:Hipparcos objects|085112]]
[[Category:Bright Star Catalogue objects|6484 5]]

Latest revision as of 02:45, 13 August 2023

Rho Herculis
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
ρ Her A
Right ascension 17h 23m 40.972s[1]
Declination +37° 08′ 45.33″[1]
Apparent magnitude (V) 4.510[1]
ρ Her B
Right ascension 17h 23m 40.718s
Declination +37° 08′ 48.44″[1]
Apparent magnitude (V) 5.398[1]
Characteristics
ρ Her A
Spectral type A0IIIpHgMn[2]
U−B color index −0.06[3]
B−V color index +0.00[3]
ρ Her B
Spectral type B9.5IVn[2]
Astrometry
ρ Her A
Radial velocity (Rv)−21.0 ± 2[4] km/s
Proper motion (μ) RA: −38.6[5] mas/yr
Dec.: 9.2[5] mas/yr
Parallax (π)8.3380 ± 0.3358 mas[6]
Distance390 ± 20 ly
(120 ± 5 pc)
ρ Her B
Radial velocity (Rv)−19.3 ± 2[4] km/s
Proper motion (μ) RA: −38.6[1] mas/yr
Dec.: 9.2[1] mas/yr
Parallax (π)9.0354 ± 0.1135 mas[7]
Distance361 ± 5 ly
(111 ± 1 pc)
Details
A
Mass4.00/2.93[8] M☉
Temperature9,118[6] K
Metallicity [Fe/H]0.0[9] dex
Rotational velocity (v sin i)75[10] km/s
B
Mass3.27[8] M☉
Surface gravity (log g)3.6[9] cgs
Temperature8,755[7] K
Rotational velocity (v sin i)291[10] km/s
Other designations
BD+37° 2878, HIP 85112, ADS 10526 AB, CCDM J17236+3708AB
ρ Her A: HD 157779, HR 6485, SAO 66001
ρ Her B: HD 157778, HR 6484, SAO 66000
Database references
SIMBADρ Her
ρ Her A
ρ Her B

Rho Herculis (ρ Her, ρ Herculis) is a double star in the constellation of Hercules. The apparent magnitudes of the components are 4.510 and 5.398, respectively. Parallax measurements published in Gaia Data Release 2 put the system at some 360-390 light-years (111-121 parsecs) away.

The two stars of Rho Herculis are separated by four arcseconds, and are known as Rho Herculis A and B, respectively. A is an A-type giant star, while B is a B-type subgiant star.[2] They are also referred to, rarely, as Rho1 Herculis and Rho2 Herculis. Rho Herculis A is itself a close binary which has been resolved using speckle interferometry, with the two components separated by 0.252″.[11]

The two visual components have very similar spectral types, between A0 and B9. Rho Herculis A is generally assigned a giant luminosity class, with Rho Herculis B most often considered to be a main sequence star.[12] Rho Herculis A has been considered to be an Ap star, with unusually strong silicon or mercury and manganese absorption lines in its spectrum,[2][13] but this is now considered to be dubious.[14]

References

[edit]
  1. ^ a b c d e f g Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  2. ^ a b c d Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
  3. ^ a b Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
  4. ^ a b Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication: 0. Bibcode:1953GCRV..C......0W.
  5. ^ a b Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. Bibcode:2012yCat.1322....0Z.
  6. ^ 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.
  7. ^ 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.
  8. ^ a b "Multiple Star Catalog". Cerro Tololo Inter-American Observatory. Archived from the original on 2018-12-01. Retrieved 2018-11-30.
  9. ^ a b Gebran, M.; Farah, W.; Paletou, F.; Monier, R.; Watson, V. (2016). "A new method for the inversion of atmospheric parameters of A/Am stars". Astronomy and Astrophysics. 589: A83. arXiv:1603.01146. Bibcode:2016A&A...589A..83G. doi:10.1051/0004-6361/201528052. S2CID 118549566.
  10. ^ a b Royer, F.; Grenier, S.; Baylac, M. -O.; Gómez, A. E.; Zorec, J. (2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin I". Astronomy and Astrophysics. 393 (3): 897–911. arXiv:astro-ph/0205255. Bibcode:2002A&A...393..897R. doi:10.1051/0004-6361:20020943.
  11. ^ Mason, Brian D.; Hartkopf, William I.; Gies, Douglas R.; Henry, Todd J.; Helsel, John W. (2009). "The High Angular Resolution Multiplicity of Massive Stars". The Astronomical Journal. 137 (2): 3358. arXiv:0811.0492. Bibcode:2009AJ....137.3358M. doi:10.1088/0004-6256/137/2/3358. S2CID 119268845.
  12. ^ Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016)". VizieR On-line Data Catalog. Bibcode:2014yCat....1.2023S.
  13. ^ Abt, H. A.; Cardona, O. (1984). "The nature of the visual companions of AP and AM stars". The Astrophysical Journal. 276: 266. Bibcode:1984ApJ...276..266A. doi:10.1086/161610.
  14. ^ Renson, P.; Manfroid, J. (2009). "Catalogue of Ap, HgMn and Am stars". Astronomy and Astrophysics. 498 (3): 961. Bibcode:2009A&A...498..961R. doi:10.1051/0004-6361/200810788.
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