View source for Astronomy:HD 130948

{{Short description|Star in the constellation Boötes}}
{{Starbox begin
| name=HD 130948 }}
{{Starbox image
| image = [[Image:HPBooLightCurve.png|250px]]
| caption = The [[Astronomy:Photometric system#Photometric letters|visual band]] [[Astronomy:Light curve|light curve]] of HP Boötes, plotted from data published by Gaidos ''et al.'' (2000)<ref name="Gaidos"/>
}}
{{Starbox observe
| epoch=J2000
| ra={{RA|14|50|15.8112}}<ref name=aaa323_L49/>
| dec={{DEC|+23|54|42.639}}<ref name=aaa323_L49/>
| appmag_v=5.9949<ref name=aaa474_2_653/>
| constell=Boötes }}
{{Starbox character
| class=G1V<ref name=aaas141_491/>
| b-v=0.576<ref name=aaa474_2_653/>
| u-b=+0.01<ref name=simbad/>
| variable=[[Astronomy:BY Draconis variable|BY Dra]] }}
{{Starbox astrometry
| radial_v=−1.5<ref name=rgcrv/>
| prop_mo_ra=143.91<ref name=aaa474_2_653/>
| prop_mo_dec=32.69<ref name=aaa474_2_653/>
| parallax=55.03
| p_error=0.34
| parallax_footnote=<ref name=aaa474_2_653/>
| absmag_v= }}
{{Starbox detail
| mass=0.97<ref name=aaas141_491/>
| radius=
| luminosity=
| temperature=5,780<ref name=aaas141_491/>
| metal=<nowiki>[Fe/H]</nowiki> = -0.20<ref name=aaas141_491/> or 0.00<ref name=apj692_1_729/>
| gravity=4.18<ref name=aaas141_491/>
| rotation=
| age_gyr=4.7<ref name=aaa501_3_941/> or 0.5<ref name=apj692_1_729/> }}
{{Starbox catalog
| names=[[Astronomy:Variable star designation|HP]] Boötis, GJ 564, BD+24° 2786, HD 130948, FK5 3172, HIP 72567, HR 5534, SAO 83553.<ref name=simbad/>
}}
{{Starbox reference
| Simbad = HD+130948
}}
{{Starbox end}}

'''HD 130948''' or '''HP Boötis''' is a [[Astronomy:Variable star|variable star]] with 2 [[Astronomy:Brown dwarf|brown dwarf]]s in the constellation [[Astronomy:Boötes|Boötes]]. It has a [[Astronomy:Stellar classification|stellar classification]] of G1V, which means it is a [[Astronomy:Main sequence|main sequence]] star with a mass and surface temperature that are similar to the [[Astronomy:Sun|Sun]]. The estimated age of this star is also similar to the Sun at 4.7 billion years (Gyr) old, but it has a lower proportion of elements (63%) other than hydrogen or helium. However, a separate study in 2009 gave a much younger age of {{nowrap|0.5 ± 0.3 Gyr}} and a higher metallicity that is very similar to the Sun.<ref name=apj692_1_729/>

In 2002, a pair of co-orbiting [[Astronomy:Brown dwarf|brown dwarf]]s were discovered in orbit around this star. They were found using an adaptive optics instrument on the Gemini North 8m telescope in Hawaii.<ref name=apj567_2_L133/> The pair have a 10-year orbital period about the primary star, and their combined mass is 10.9% of the Sun's mass.<ref name=apj692_1_729/>

The space velocity components of this star through the [[Astronomy:Milky Way|Milky Way]] galaxy are {{nowrap|(U, V, W)}} = {{nowrap|(−14.0, 14.7, −0.1)}}.<ref name=aaas141_491/>

==References==
{{reflist|refs=

<ref name="Gaidos">{{cite journal |last1=Gaidos |first1=E. J. |last2=Henry |first2=G. W. |last3=Henry |first3=S. M. |title=Spectroscopy and Photometry of Nearby Young Solar Analogs |journal=The Astronomical Journal |date=August 2000 |volume=120 |issue=2 |pages=1006–1013 |doi=10.1086/301488 |bibcode=2000AJ....120.1006G |s2cid=16930014 |doi-access=free }}</ref>

<ref name=aaa323_L49>{{cite journal | last=Perryman | first=M. A. C. |display-authors=0 | title=The HIPPARCOS Catalogue | journal=Astronomy & Astrophysics | volume=323 | pages=L49–L52 |date=April 1997 | bibcode=1997A&A...323L..49P }}</ref>

<ref name=aaa474_2_653>{{cite journal | first=F. | last=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |arxiv = 0708.1752 | s2cid=18759600 }}</ref>

<ref name=rgcrv>{{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 | book-title=Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 | location=University of Toronto | publisher=[[Organization:International Astronomical Union|International Astronomical Union]] | bibcode=1967IAUS...30...57E }}</ref>

<ref name=aaas141_491>{{cite journal |author1=Chen, Y. Q. |author2=Nissen, P. E. |author3=Zhao, G. |author4=Zhang, H. W. |author5=Benoni, T. | title=Chemical composition of 90 F and G disk dwarfs | journal=Astronomy and Astrophysics Supplement | volume=141 | pages=491–506 |date=February 2000 |issue=3 | doi=10.1051/aas:2000124 | bibcode=2000A&AS..141..491C |arxiv = astro-ph/9912342 |s2cid=16273589 }}</ref>

<ref name=simbad>{{cite web | title=V* HP Boo -- Variable of BY Dra type | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+130948 | access-date=2010-10-03 }}</ref>

<ref name=aaa501_3_941>{{cite journal |author1=Holmberg, J. |author2=Nordstrom, B. |author3=Andersen, J. | title=The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics | journal=Astronomy and Astrophysics | volume=501 | issue=3 |date=July 2009 | pages=941–947 | doi=10.1051/0004-6361/200811191 | bibcode=2009A&A...501..941H|arxiv = 0811.3982 |s2cid=118577511 }}</ref>

<ref name=apj567_2_L133>{{cite journal |author1=Potter, Daniel |author2=Martín, Eduardo L. |author3=Cushing, Michael C. |author4=Baudoz, Pierre |author5=Brandner, Wolfgang |author6=Guyon, Olivier |author7=Neuhäuser, Ralph |title=Hokupa'a-Gemini Discovery of Two Ultracool Companions to the Young Star HD 130948 |journal=The Astrophysical Journal |volume=567 |issue=2 |pages=L133–L136 |date=March 2002 |doi=10.1086/339999 | bibcode=2002ApJ...567L.133P |arxiv=astro-ph/0201431 |s2cid=16249194 }}</ref>

<ref name=apj692_1_729>{{cite journal |title=Dynamical Mass of the Substellar Benchmark Binary HD 130948BC |author1=Dupuy, Trent J. |author2=Liu, Michael C. |author3=Ireland, Michael J. |journal=The Astrophysical Journal |volume=692 |issue=1 |pages=729–752 |date=February 2009 |doi=10.1088/0004-637X/692/1/729 |bibcode=2009ApJ...692..729D |arxiv=0807.2450 |s2cid=119237470 }}</ref>

}}

{{Stars of Boötes}}

[[Category:Boötes]]
[[Category:Henry Draper Catalogue objects|130948]]
[[Category:Hipparcos objects|072567]]
[[Category:G-type main-sequence stars]]
[[Category:Objects with variable star designations|Bootis, HP]]
[[Category:Gliese and GJ objects|0564]]
[[Category:Durchmusterung objects]]
[[Category:Bright Star Catalogue objects|5534]]

{{Sourceattribution|HD 130948}}