The system consists of a binary pair,[13] designated Lambda Ophiuchi AB, together with a third companion, C. AB's two components are themselves designated Lambda Ophiuchi A (also named Marfik[2]) and B.
Nomenclature
λ Ophiuchi (Latinised to Lambda Ophiuchi) is the system's Bayer designation. The designations of the three components as Lambda Ophiuchi A, B and C derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[3]It bore the traditional name Marfik (or Marsik), meaning "the elbow" in Arabic. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[4] to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[5] It approved the name Marfik for the component Lambda Ophiuchi A on 12 September 2016 and it is now so included in the List of IAU-approved Star Names.[2]
Properties
Lambda Ophiuchi has apparent magnitude +3.82. Its to spectral type is A1V+A. The two components orbit each other with a period of 129 years.[1]
References
1. ^1 {{cite journal|title=The visual binary Lambda Ophiuchi|author1=Heintz, W. D.|author2=Strom, C.|journal=Astronomical Society of the Pacific|volume=105|number=685|page=293|date=1993|bibcode=1993PASP..105..293H|doi=10.1086/133145}}
2. ^1 {{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |accessdate=16 December 2017}}
3. ^{{cite arXiv |title=On the naming convention used for multiple star systems and extrasolar planets |date=2010 |eprint=1012.0707 |class=astro-ph.SR |last1= Hessman |first1=F. V. |last2= Dhillon |first2=V. S. |last3= Winget |first3=D. E. |last4= Schreiber |first4=M. R. |last5= Horne |first5=K. |last6= Marsh |first6=T. R. |last7= Guenther |first7=E. |last8= Schwope |first8=A. |last9= Heber |first9=U. }}
4. ^{{citation | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN) | publisher=International Astronomical Union | accessdate=22 May 2016 | postscript=. }}
5. ^{{cite web | url=https://www.iau.org/static/science/scientific_bodies/working_groups/280/wg-starnames-triennial-report-2015-2018.pdf | page=5 | title=WG Triennial Report (2015–2018) – Star Names |accessdate=2018-07-14}}
6. ^1 2 3 {{cite web | title=lam Oph – Variable Star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=lam+Oph&submit=SIMBAD+search | accessdate=8 June 2010 }}
7. ^1 {{Cite conference | last=Evans | first=D. S. | date=June 20–24, 1966 |editor1=Batten, Alan Henry|editor2=Heard, John Frederick | title=The Revision of the General Catalogue of Radial Velocities | booktitle=Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 | location=University of Toronto | publisher=International Astronomical Union | bibcode=1967IAUS...30...57E }}
8. ^1 {{cite journal |author1=Royer, F. |author2=Zorec, J. |author3=Gómez, A. E. | title=Rotational velocities of A-type stars. III. Velocity distributions | journal=Astronomy and Astrophysics | volume=463 | issue=2 | pages=671–682 |date=February 2007 | doi=10.1051/0004-6361:20065224 | bibcode=2007A&A...463..671R |arxiv = astro-ph/0610785 }}
9. ^1 {{cite journal |author1=Lastennet, E. |author2=Fernandes, J. |author3=Lejeune, Th. | title=A revised HRD for individual components of binary systems from BaSeL BVRI synthetic photometry. Influence of interstellar extinction and stellar rotation | journal=Astronomy and Astrophysics | volume=388 | pages=309–319 |date=June 2002 | doi=10.1051/0004-6361:20020439 | bibcode=2002A&A...388..309L |arxiv = astro-ph/0203341 }}
10. ^1 2 {{cite journal | author=Johnson, H. L. |display-authors=etal | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | year=1966 | bibcode=1966CoLPL...4...99J }}