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{{DISPLAYTITLE:Rho1 Arae}}{{Starbox begin
| name=Rho1 Arae
}}{{Starbox image
| image =
| caption = The location of ρ1 Arae (circled)
}}{{Starbox observe
| epoch = J2000
| ra = {{RA|16|56|08.8405}}
| dec = {{DEC|–50|40|29.244}}
| appmag_v = 6.275[3]
| constell = Ara
}}{{Starbox character
| class = B3 Vnpe
| r-i =
| v-r =
| b-v = +0.008[3]
| u-b = –0.691[3]
| variable =
}}{{Starbox astrometry
| radial_v = +19[6]
| prop_mo_ra = –7.66
| prop_mo_dec = –9.79
| parallax = 5.06
| p_error = 0.39
| parallax_footnote =
| absmag_v = −0.16[10]
}}{{Starbox detail
| mass = {{nowrap|6.3 ± 0.1}}[11]
| radius =
| luminosity = 1,418[12]
| temperature = 19,800[13]
| metal_fe =
| gravity = 3.75[13]
| rotational_velocity = {{nowrap|370 ± 10}}[15]
| age_myr = {{nowrap|18.4 ± 1.5}}[11]
}}{{Starbox catalog
| names = ρ1 Ara, V846 Arae, CD–50 10905, GC 22790, HD 152478, HIP 82868, HR 6274, NSV 8047, SAO 244280.[17]
}}{{Starbox reference
| Simbad = V846+Ara
}}{{Starbox end}}Rho1 Arae is the Bayer designation for a star in the southern constellation of Ara. Unusually for a star with a Bayer designation, it was not catalogued by Bayer in his Uranometria. It was instead first catalogued by Nicolas Lacaille, in his Coelum Australe Stelliferum published in 1763. This star gained the Bayer designation of Rho1 Arae in Bode's Uranographia, published in 1801. Rho1 Arae is one of the dimmest stars with a Bayer designation, having an apparent visual magnitude of just +6.275[3] According to the Bortle Dark-Sky Scale, this means the star is just barely visible to the naked eye in dark rural skies. Based upon parallax measurements, it is about {{Convert|640|ly|pc|abbr=off|lk=on}} distant from the Sun, give or take a 50 light-year margin of error.This is a spectroscopic binary system, which means that the presence of an orbiting companion is indicated by shifts in the spectrum. However, because the primary component is spinning rapidly with a projected rotational velocity of {{nowrap|370 ± 10}}, it is difficult to obtain reliable orbital elements. The orbital period has been estimated at 0.439 days. The spectrum of this system matches a stellar classification of B3 Vnpe, which may indicate the primary is a B-type main sequence star. The 'e' suffix indicates the presence of emission lines, indicating this is a Be star. For Rho1 Arae, the emission lines are prominent and variable.[15] Rho1 Arae has a peculiar velocity of {{nowrap|27.4 ± 4.9 km/s}} relative to its neighbors,[11] making it a runaway star system. A scenario that it was ejected from the Scorpius-Centaurus OB association as a result of a past supernova explosion seems unlikely because of its binarity.[15] References1. ^1 {{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | postscript=. }}
2. ^1 {{citation | last=Evans | first=D. S. | date=June 20–24, 1966 | editor=Batten, Alan Henry | editor2=Heard, John Frederick | contribution=The Revision of the General Catalogue of Radial Velocities | title=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 | postscript=. }}
3. ^1 2 3 4 {{citation | last1=Kozok | first1=J. R. | title=Photometric observations of emission B-stars in the southern Milky Way | journal=Astronomy and Astrophysics Supplement Series | volume=61 | pages=387–405 |date=September 1985 | bibcode=1985A&AS...61..387K | postscript=. }}
4. ^1 2 3 {{citation | last1=Tetzlaff | first1=N. | last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M. | title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun | journal=Monthly Notices of the Royal Astronomical Society | volume=410 | issue=1 | pages=190–200 |date=January 2011 | doi=10.1111/j.1365-2966.2010.17434.x | bibcode=2011MNRAS.410..190T | postscript=. |arxiv = 1007.4883 }}
5. ^1 2 {{citation | last1=Soubiran | first1=C. | last2=Le Campion | first2=J.-F. | last3=Cayrel de Strobel | first3=G. | last4=Caillo | first4=A. | title=The PASTEL catalogue of stellar parameters | journal=Astronomy and Astrophysics | volume=515 | page=A111 |date=June 2010 | doi=10.1051/0004-6361/201014247 | bibcode=2010A&A...515A.111S | postscript=. |arxiv = 1004.1069 }}
6. ^1 {{citation | last1=Hohle | first1=M. M. | last2=Neuhäuser | first2=R. | last3=Schutz | first3=B. F. | title=Masses and luminosities of O- and B-type stars and red supergiants | journal=Astronomische Nachrichten | volume=331 | issue=4 | page=349 |date=April 2010 | doi=10.1002/asna.200911355 | bibcode=2010AN....331..349H | postscript=. |arxiv = 1003.2335 }}
7. ^1 2 3 {{citation | display-authors=1 | last1=Jilinski | first1=E. | last2=Ortega | first2=V. G. | last3=Drake | first3=N. A. | last4=de la Reza | first4=R. | title=A Dynamical Study of Suspected Runaway Stars as Traces of Past Supernova Explosions in the Region of the Scorpius-Centaurus OB Association | journal=The Astrophysical Journal | volume=721 | issue=1 | pages=469–477 |date=September 2010 | doi=10.1088/0004-637X/721/1/469 | bibcode=2010ApJ...721..469J | postscript=. }}
8. ^1 {{cite simbad | title=rho01 Ara | accessdate=2012-08-01 | postscript=. }}
}}External links- HR 6274
- HIP 82868
- Image HD 152478
{{Stars of Ara}} 8 : Ara (constellation)|Henry Draper Catalogue objects|Emission-line stars|Hipparcos objects|Objects with variable star designations|HR objects|Bayer objects|Durchmusterung objects |