imported>Lithopsian: +GJ 9284

2025-03-27T17:43:24Z

+GJ 9284

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{{Short description|Binary star system in the constellation Volans}}
{{Starbox begin
| name = [[Bayer designation|α Volantis]]
}}
{{Starbox image
| image=
{{Location mark
|image=Volans constellation map.svg|alt=|float=center|width=260
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=α Vol
|x=206|y=428
}}
|caption=Location of α Volantis (circled)
}}
{{Starbox observe
| epoch = [[J2000.0]]
| constell = [[Volans]]
| ra = {{RA|09|02|26.79592}}<ref name="van Leeuwen2007"/>
| dec = {{DEC|−66|23|45.8727}}<ref name="van Leeuwen2007"/>
| appmag_v = +4.00<ref name=Mermilliod1986/>
}}
{{Starbox character
| class = kA3hA5mA5 V<ref name=aj132_1_161/>
| b-v = +0.14<ref name=Mermilliod1986/>
| u-b = +0.13<ref name=Mermilliod1986/>
| variable =
}}
{{Starbox astrometry
| radial_v = +4.9<ref name=Wielen1999/>
| prop_mo_ra = −2.00<ref name="van Leeuwen2007"/>
| prop_mo_dec = +95.51<ref name="van Leeuwen2007"/>
| parallax = 26.11
| p_error = 0.12
| parallax_footnote = <ref name="van Leeuwen2007"/>
| absmag_v = +1.60<ref name=Eggen1998/>
}}
{{Starbox orbit
| reference = <ref name=Tokovinin2019/>
| period = 0.652 ± 0.001
| periastron = 2015.593 ± 0.063
| eccentricity = 0.041 ± 0.038
| axis = 0.0321 ± 0.0013
| node = 105.3 ± 1.4
| periarg = 248.5 ± 34.2
| inclination = 101.9 ± 2.3
}}
{{Starbox detail
| mass = 1.87<ref name=David2015/>
| radius = 1.9<ref name=Cadars2001/>
| luminosity =
| gravity = 4.09<ref name="aj132_1_161"/>
| temperature = 8,198<ref name="aj132_1_161"/>
| metal_fe = +0.19<ref name="aj132_1_161"/>
| rotational_velocity = {{Val|30.6|0.4}}<ref name=Diaz2011/>
| age_myr = {{Val|427|183|377}}<ref name=apj546_1_352/>
}}
{{Starbox catalog
| names = [[Cape Photographic Durchmusterung|CPD]]−65°1065, [[FK5]] 343, [[Gliese Catalogue of Nearby Stars|GJ]] 333.3, GJ 9284, [[Henry Draper Catalogue|HD]] 78045, [[Hipparcos catalogue|HIP]] 44382, [[Bright Star Catalogue|HR]] 3615, [[Star catalogue#SAO|SAO]] 250422<ref name=SIMBAD/>
}}
{{Starbox reference
| Simbad=alf+Vol
}}
{{Starbox end}}
'''Alpha Volantis''' (Alpha Vol), [[romanization of Greek|Latinized]] from '''α Volantis''', is a [[binary star]]<ref name=Eggleton2008/> system located in the southern [[constellation]] [[Volans]]. It has an [[apparent visual magnitude]] of +4.00, which is bright enough to be seen with the naked eye. Based upon [[stellar parallax|parallax]] measurements made with the [[Hipparcos]] spacecraft, it is located at a distance of 125 [[light year]]s from the [[Sun]]. As of 2010, the two components of this system had an [[angular separation]] of 0.0318[[arcsecond|″]] along a [[position angle]] of 286.9°. The magnitude difference between the two components is 0.1.<ref name="Hartkopf2012"/> It is considered a member of the [[Sirius supercluster]].<ref name=Eggen1998/>

The primary component is an [[Am star]] with a stellar classification of kA3hA5mA5 V.<ref name=aj132_1_161/> This notation indicates the star has the weak [[Calcium K line|calcium II K-line]] of an A3 star, and the hydrogen and [[Metallicity|metallic]] lines of an A5 star.<ref name=Gray2009/> It has an estimated age of 427 million years.<ref name=apj546_1_352/> In 1992, it was found to be emitting an [[infrared excess]], suggesting the presence of a [[circumstellar disk]] of dust.<ref name=Cheng1992/> However, subsequent observations have not confirmed this.<ref name=Gaspar2013/>

==References==
{{reflist|refs=

<ref name=Tokovinin2019>{{citation
| last1=Tokovinin | first1=Andrei
| last2=Mason | first2=Brian D.
| last3=Mendez | first3=Rene A.
| last4=Horch | first4=Elliott P.
| last5=Briceño | first5=Cesar
| title=Speckle Interferometry at SOAR in 2018 | year=2019
| journal=The Astronomical Journal | volume=158 | issue=1
| pages=48
| arxiv=1905.10436 | bibcode=2019AJ....158...48T
| doi=10.3847/1538-3881/ab24e4 | s2cid=197431463
| doi-access=free
}}</ref>

<ref name="van Leeuwen2007">{{citation
| last1=van Leeuwen | first1=F.
| title=Validation of the new Hipparcos reduction
| 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
| postscript=. }}</ref>

<ref name=Eggen1998>{{citation
| title=The Sirius Supercluster and Missing Mass near the Sun
| last1=Eggen | first1=Olin J.
| journal=The Astronomical Journal | postscript=.
| volume=116 | issue=2 | pages=782–788 | date=August 1998
| doi=10.1086/300465 | bibcode=1998AJ....116..782E | doi-access=free }}</ref>

<ref name=David2015>{{citation
| title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets
| last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A.
| journal=The Astrophysical Journal
| volume=804 | issue=2 | pages=146 | year=2015
| bibcode=2015ApJ...804..146D | doi=10.1088/0004-637X/804/2/146
| arxiv=1501.03154 | s2cid=33401607 | postscript=. }}</ref>

<ref name=apj546_1_352>{{citation
| display-authors=1 | last1=Song | first1=Inseok | last2=Caillault | first2=J.-P. | last3=Barrado y Navascués | first3=David | last4=Stauffer | first4=John R.
| title=Ages of A-Type Vega-like Stars from uvbyβ Photometry
| journal=The Astrophysical Journal
| volume=546 | issue=1 | pages=352–357 | date=February 2001
| doi=10.1086/318269 | bibcode=2001ApJ...546..352S
| arxiv=astro-ph/0010102 | s2cid=18154947 | postscript=. }}</ref>

<ref name=Eggleton2008>{{citation
| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.
| title=A catalogue of multiplicity among bright stellar systems
| journal=Monthly Notices of the Royal Astronomical Society
| volume=389 | issue=2 | pages=869–879 | date=September 2008
| bibcode=2008MNRAS.389..869E | doi=10.1111/j.1365-2966.2008.13596.x
| doi-access=free | arxiv=0806.2878 | s2cid=14878976 | postscript=. }}</ref>

<ref name=aj132_1_161>{{citation
| display-authors=1
| last1=Gray | first1=R. O. | last2=Corbally | first2=C. J.
| last3=Garrison | first3=R. F. | last4=McFadden | first4=M. T.
| last5=Bubar | first5=E. J. | last6=McGahee | first6=C. E.
| last7=O'Donoghue | first7=A. A. | last8=Knox | first8=E. R.
| title=Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample
| journal=[[The Astronomical Journal]]
| volume=132 | issue=1 | pages=161–170 | date=July 2006
| doi=10.1086/504637 | bibcode=2006AJ....132..161G
| arxiv=astro-ph/0603770 | s2cid=119476992 | postscript=. }}</ref>

<ref name=Mermilliod1986>{{citation
| last1=Mermilliod | first1=J.-C.
| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)
| journal=Catalogue of Eggen's UBV Data. SIMBAD
| date=1986 | bibcode=1986EgUBV........0M | postscript=. }}</ref>

<ref name="aj132_1_161">{{citation
| display-authors=1
| last1=Gray | first1=R. O. | last2=Corbally | first2=C. J.
| last3=Garrison | first3=R. F. | last4=McFadden | first4=M. T.
| last5=Bubar | first5=E. J. | last6=McGahee | first6=C. E.
| last7=O'Donoghue | first7=A. A. | last8=Knox | first8=E. R.
| title=Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample
| journal=[[The Astronomical Journal]]
| volume=132 | issue=1 | pages=161–170 | date=July 2006
| doi=10.1086/504637 | bibcode=2006AJ....132..161G
| arxiv=astro-ph/0603770 | s2cid=119476992 | postscript=. }}</ref>

<ref name=Diaz2011>{{citation
| display-authors=1
| last1=Díaz | first1=C. G. | last2=González | first2=J. F.
| last3=Levato | first3=H. | last4=Grosso | first4=M.
| title=Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum
| journal=Astronomy & Astrophysics
| volume=531 | page=A143 |date=July 2011
| doi=10.1051/0004-6361/201016386 | bibcode=2011A&A...531A.143D
| arxiv=1012.4858 | s2cid=119286673 | postscript=. }}</ref>

<ref name=Wielen1999>{{citation
| display-authors=1
| title=Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions
| journal=Veröff. Astron. Rechen-Inst. Heidelb
| volume=35
| last1=Wielen | first1=R. | last2=Schwan | first2=H.
| last3=Dettbarn | first3=C. | last4=Lenhardt | first4=H.
| last5=Jahreiß | first5=H. | last6=Jährling | first6=R.
| publisher=Astronomisches Rechen-Institut Heidelberg
| issue=35 | year=1999 | pages=1
| bibcode=1999VeARI..35....1W | postscript=. }}</ref>

<ref name=Cadars2001>{{citation
| last1=Pasinetti Fracassini | first1=L. E. | last2=Pastori | first2=L.
| last3=Covino | first3=S. | last4=Pozzi | first4=A.
| title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)
| edition=Third | journal=Astronomy and Astrophysics
| volume=367 | issue=2 | pages=521–524 | date=February 2001
| bibcode=2001A&A...367..521P | doi=10.1051/0004-6361:20000451
| arxiv=astro-ph/0012289 | s2cid=425754 | postscript=. }}</ref>

<ref name=Gray2009>{{citation
| last1=Gray | first1=Richard O. | last2=Corbally | first2=Christopher J.
| title=Stellar Spectral Classification | page=309 | date=2009
| publisher=[[Princeton University Press]] | location=Princeton, New Jersey
| isbn=978-0-691-12511-4 | postscript=. }}</ref>

<ref name=Cheng1992>{{citation
| display-authors=1
| last1=Cheng, K.-P. | last2=Bruhweiler | first2=F. C.
| last3=Kondo | first3=Y. | last4=Grady | first4=C. A.
| title=Newly identified main-sequence A stars with circumstellar dust
| journal=Astrophysical Journal, Part 2
| volume=396 | issue=2 | pages=L83–L86 | date=September 1992
| doi=10.1086/186522 | bibcode=1992ApJ...396L..83C
| postscript=. }}</ref>

<ref name=Gaspar2013>{{citation
| title=The Collisional Evolution of Debris Disks
| display-authors=1 | last1=Gáspár | first1=András
| last2=Rieke | first2=George H. | last3=Balog | first3=Zoltán
| journal=The Astrophysical Journal
| volume=768 | issue=1 | id=25 | pages=29 | date=May 2013
| doi=10.1088/0004-637X/768/1/25 | bibcode=2013ApJ...768...25G
| postscript=. |arxiv = 1211.1415 | s2cid=119295265 }}</ref>

<ref name="Hartkopf2012">{{citation
| title=Speckle Interferometry at SOAR in 2010 and 2011: Measures, Orbits, and Rectilinear Fits
| display-authors=1 | last1=Hartkopf | first1=William I.
| last2=Tokovinin | first2=Andrei | last3=Mason | first3=Brian D.
| journal=The Astronomical Journal
| volume=143 | issue=2 | id=42 | pages=19 | date=2012
| bibcode=2012AJ....143...42H | doi=10.1088/0004-6256/143/2/42
| postscript=. | url=https://apps.dtic.mil/sti/pdfs/ADA556130.pdf| archive-url=https://web.archive.org/web/20170629124941/http://www.dtic.mil/get-tr-doc/pdf?AD=ADA556130| url-status=live| archive-date=June 29, 2017| doi-access=free }}</ref>

<ref name=SIMBAD>{{cite simbad | mode=cs2
| title=alf Vol
| access-date=2016-09-02 | postscript=. }}</ref>

}}

{{Stars of Volans}}

{{DEFAULTSORT:Alpha Volantis}}
[[Category:Bayer objects|Volantis, Alpha]]
[[Category:Volans]]
[[Category:A-type main-sequence stars]]
[[Category:Hipparcos objects|044382]]
[[Category:Bright Star Catalogue objects|3615]]
[[Category:Gliese and GJ objects|9284]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|078045]]
[[Category:Binary stars]]
[[Category:Am stars]]

Alpha Volantis - Revision history

imported>Lithopsian: +GJ 9284