{{Short description|Binary star system in the constellation Boötes}} {{Starbox begin}} {{Starbox image | image = [[Image:DEBooLightCurve.png|250px]] | caption = A [[Photometric_system#Photometric_letters|visual band]] [[light curve]] for DE Boötes, adapted from Henry ''et al.'' (1995)<ref name="Henry"/> }} {{Starbox observe | epoch = J2000 | constell = [[Boötes]]<ref name=constellation/> | ra = {{RA|14|53|23.76674}}<ref name=aaa474_2_653/> | dec = {{DEC|+19|09|10.0813}}<ref name=aaa474_2_653/> | appmag_v = 6.00<ref name="MERMILLIOD"/> {{nowrap|(5.97 to 6.04)}}<ref name=Samus2017/> }} {{Starbox character | type = [[main sequence]]<ref name=boldog2023/> | class = K0&nbsp;V<ref name=mnras447_1_L75/> | r-I = 0.42{{cn|date=December 2019}} | b-v = +0.84<ref name=mnras447_1_L75/> | u-b = +0.49<ref name=mnras447_1_L75/> | variable = [[RS Canum Venaticorum variable|RS CVn]]<ref name=Samus2017/> }} {{Starbox astrometry | radial_v = {{Val|−29.82|0.15}}<ref name=mnras349_1_1069/> | prop_mo_ra = −442.23<ref name=aaa474_2_653/> | prop_mo_dec = +217.61<ref name=aaa474_2_653/> | parallax = 86.88 | p_error = 0.46 | parallax_footnote = <ref name=aaa474_2_653/> | absmag_v = 5.69<ref name=Holmberg2009/> }} {{Starbox orbit | reference = <ref name=Kennedy2015/> | period_unitless = {{val|125.396|0.001|u=days}} | axis_unitless = {{Val|0.19|0.03|ul=AU}} | eccentricity = {{val|0.51|0.001}} | inclination = {{val|93.4|4.2}} | node = {{val|248.3|3.6}} | periastron = <!--Periastron epoch--> | periarg = {{Val|219|0.1}} }} {{Starbox detail | component1 = HR 5553 A | mass = 0.84<ref name=aa570_A114/> | radius = 0.87<ref name=boldog2023/> | luminosity = 0.498<ref name=aa570_A114/> | temperature = 5,313<ref name=aa555_A11/> | metal_fe = 0.10<ref name=aa555_A11/> | rotation = 10.4<ref name=aa555_A11/> | rotational_velocity = 4.0<ref name=aa555_A11/> | gravity = 4.57<ref name=aa555_A11/> | age_gyr = 0.7–1.3<ref name="apj687"/> | component2 = HR 5553 B | mass2 = 0.45<ref name=mnras447_1_L75/> | temperature2 = 3,596<ref name=boldog2023/> | radius2 = 0.37<ref name=boldog2023/> | luminosity2 = 0.021<ref name=boldog2023/> }} {{Starbox catalog | names = {{odlist | V=DE Boo | BD=+19°2881 | GJ=567 | HD=131511 | HIP=72848 | LHS=5279 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = HR+5553 }} {{Starbox end}}

'''HR 5553''' is a [[binary star]] system located thirty-eight&nbsp;[[light-year]]s away from the [[Sun]], in the northern [[constellation]] [[Boötes]]. It has the [[variable star designation]] '''DE Boötis''', and is classified as an [[RS Canum Venaticorum variable]] that ranges in [[apparent visual magnitude]] from 5.97 down to 6.04,<ref name=Samus2017/> which is bright enough to be dimly visible to the [[naked eye]]. The system is drifting closer to the [[Sun]] with a [[radial velocity]] of −30&nbsp;km/s,<ref name=mnras349_1_1069/> and is expected to come as close as {{Convert|8.2395|pc|ly|1|disp=out|abbr=off}} in 210,000 years.<ref name=Bailer2018/>

Orbital elements for this single-lined [[spectroscopic binary]] was first calculated in 1981 using radial velocity measurements from [[David Dunlap Observatory]] combined with older measurements from [[Mount Wilson Observatory]] and [[Dominion Astrophysical Observatory]].<ref name="Kamper1981"/> The two stars orbit each other with a [[orbital period|period]] of 125 days and a large [[orbital eccentricity|eccentricity]] of 0.51.<ref name=mnras447_1_L75/>

[[Marcel Golay (astronomer)|Marcel Golay]] listed the star as a suspected variable star in 1973.<ref name="Golay"/> Gregory W. Henry ''et al.'' confirmed that it is a variable star in 1995.<ref name="Henry"/> It was given its variable star designation, DE Boötis, in 1997.<ref name="Kazarovets1997"/>

The primary, designated component A, is a [[K-type main sequence star]] with a [[stellar classification]] of K0&nbsp;V. It is around one<ref name="apj687"/>&nbsp;billion years old and is spinning with a [[projected rotational velocity]] of 4&nbsp;km/s.<ref name=aa555_A11/> The star has 84% of the [[mass of the Sun]] and 86% of the [[Sun's radius]].<ref name=aa570_A114/> It is radiating 50%<ref name=aa570_A114/> of the [[luminosity of the Sun]] from its [[photosphere]] at an [[effective temperature]] of 5,313&nbsp;K.<ref name=aa555_A11/> Component B has an estimated 45% of the mass of the Sun.<ref name=mnras447_1_L75/>

An [[infrared excess]] has been detected around this system, most likely indicating the presence of a [[circumstellar disk]] at a radius of 34.2&nbsp;[[Astronomical Unit|AU]]. The temperature of this dust is 40&nbsp;K.<ref name=aa555_A11/> The estimated mass of the dust is 0.0002 times the mass of the [[Earth]]. It is aligned to within 10° of the plane of the binary system.<ref name=aa570_A114/><ref name=Kennedy2015/>

==References== <references> <ref name=SIMBAD>{{cite simbad | title=DE Boo | access-date=2019-12-07 }}</ref>

<ref name=constellation>{{cite constellation|HR 5553}}</ref>

<ref name=boldog2023>{{cite journal |last1=Boldog |first1=Á. |last2=Szabó |first2=Gy. M. |last3=Kriskovics |first3=L. |last4=Brandeker |first4=A. |last5=Kiefer |first5=F. |last6=Bekkelien |first6=A. |last7=Guterman |first7=P. |last8=Olofsson |first8=G. |last9=Simon |first9=A. E. |last10=Gandolfi |first10=D. |last11=Serrano |first11=L. M. |last12=Wilson |first12=T. G. |last13=Sousa |first13=S. G. |last14=Lecavelier Des Etangs |first14=A. |last15=Alibert |first15=Y. |last16=Alonso |first16=R. |last17=Anglada |first17=G. |last18=Bandy |first18=T. |last19=Bárczy |first19=T. |last20=Barrado |first20=D. |last21=Barros |first21=S. C. C. |last22=Baumjohann |first22=W. |last23=Beck |first23=M. |last24=Beck |first24=T. |last25=Benz |first25=W. |last26=Billot |first26=N. |last27=Bonfils |first27=X. |last28=Broeg |first28=C. |last29=Buder |first29=M. |last30=Cabrera |first30=J. |display-authors=1 |title=Glancing through the debris disk: Photometric analysis of DE Boo with CHEOPS |journal=Astronomy & Astrophysics |date=2023 |volume=671 |pages=A127 |doi=10.1051/0004-6361/202245101 |bibcode=2023A&A...671A.127B |arxiv=2302.02710 }}</ref>

<ref name="Henry">{{cite journal |last1=Henry |first1=Gregory W. |last2=Fekel |first2=Francis C. |last3=Hall |first3=Douglas S. |title=An Automated Search for Variability in Chromospherically Active Stars |journal=The Astronomical Journal |date=December 1995 |volume=110 |issue=6 |pages=2926–2967 |doi=10.1086/117740 |bibcode=1995AJ....110.2926H }}</ref>

<ref name="Golay">{{cite book | last1=Golay | first1=M. | title=Problems of Calibration of Absolute Magnitudes and Temperature of Stars | chapter=Remarks on the Photometric Criteria of Choice of the Standard Stars | date=1973 | volume=54 | publisher=Reidel | location=Boston | pages=275–297 | doi=10.1007/978-94-010-2645-1_33 | bibcode=1973IAUS...54..275G | isbn=978-90-277-0372-9 }}</ref>

<ref name=Kennedy2015>{{cite journal | title=Nature or nurture of coplanar Tatooines: the aligned circumbinary Kuiper Belt analogue around HD 131511. | last=Kennedy | first=G. M. | journal=Monthly Notices of the Royal Astronomical Society | volume=447 | issue=1 | pages=L75–L79 | date=February 2015 | arxiv=1412.0674 | bibcode=2015MNRAS.447L..75K | doi=10.1093/mnrasl/slu190 | doi-access=free }}</ref>

<ref name=Bailer2018>{{cite journal | last1=Bailer-Jones | first1=C.A.L. | last2=Rybizki | first2=J | last3=Andrae | first3=R. | last4=Fouesnea | first4=M. | title=New stellar encounters discovered in the second Gaia data release | display-authors=1 | journal=Astronomy & Astrophysics | volume=616 | pages=A37 | date=2018 | arxiv=1805.07581 | bibcode=2018A&A...616A..37B | doi=10.1051/0004-6361/201833456 | s2cid=56269929 }}</ref>

<ref name=Holmberg2009>{{citation | display-authors=1 | last1=Holmberg | first1=J. | last2=Nordström | first2=B. | last3=Andersen | first3=J. | title=The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics | volume=501 | issue=3 |date=July 2009 | pages=941–947 | journal=Astronomy and Astrophysics | doi=10.1051/0004-6361/200811191 | bibcode=2009A&A...501..941H | arxiv=0811.3982 | s2cid=118577511 | postscript=. }}</ref>

<ref name="Kazarovets1997">{{cite journal | last1=Kazarovets | first1=E. V. | last2=Samus | first2=N. N. | title=The 73rd Name-List of Variable Stars | journal=Information Bulletin on Variable Stars | date=April 1997 | volume=4471 | pages=1–45 | bibcode=1997IBVS.4471....1K | url=https://ibvs.konkoly.hu/pub/ibvs/4401/4471.pdf | access-date=6 December 2024}}</ref>

<ref name=Samus2017>{{cite journal | title=General catalogue of variable stars: Version GCVS 5.1 | last1=Samus' | first1=N. N | last2=Kazarovets | first2=E. V | last3=Durlevich | first3=O. V | last4=Kireeva | first4=N. N | last5=Pastukhova | first5=E. N | journal=Astronomy Reports | volume=61 | issue=1 | pages=80 | year=2017 | doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S | s2cid=125853869 }}</ref>

<ref name="Kamper1981">{{cite journal | title=The Spectroscopic Orbits of HD131511 | last1=Kamper | first1=K. W. | last2=Lyons | first2=R. W. | journal=Journal of the Royal Astronomical Society of Canada | volume=75 | pages=56–58 | year=1981 | bibcode=1981JRASC..75...56K }}</ref>

<ref name=aaa474_2_653>{{citation | first1=Floor | last1=van Leeuwen | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | date=November 2007 | bibcode=2007A&A...474..653V | arxiv=0708.1752v1 | doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}</ref>

<ref name=aa555_A11>{{citation | display-authors=1 | last1=Eiroa | first1=C. | last2=Marshall | first2=J. P. | last3=Mora | first3=A. | last4=Montesinos | first4=B. | last5=Absil | first5=O. | last6=Augereau | first6=J. Ch. | last7=Bayo | first7=A. | last8=Bryden | first8=G. | last9=Danchi | first9=W. | last10=del Burgo | first10=C. | last11=Ertel | first11=S. | last12=Fridlund | first12=M. | last13=Heras | first13=A. M. | last14=Krivov | first14=A. V. | last15=Launhardt | first15=R. | last16=Liseau | first16=R. | last17=Löhne | first17=T. | last18=Maldonado | first18=J. | last19=Pilbratt | first19=G. L. | last20=Roberge | first20=A. | last21=Rodmann | first21=J. | last22=Sanz-Forcada | first22=J. | last23=Solano | first23=E. | last24=Stapelfeldt | first24=K. | last25=Thébault | first25=P. | last26=Wolf | first26=S. | last27=Ardila | first27=D. | last28=Arévalo | first28=M. | last29=Beichmann | first29=C. | last30=Faramaz | first30=V. | last31=González-García | first31=B. M. | last32=Gutiérrez | first32=R. | last33=Lebreton | first33=J. | last34=Martínez-Arnáiz | first34=R. | last35=Meeus | first35=G. | last36=Montes | first36=D. | last37=Olofsson | first37=G. | last38=Su | first38=K. Y. L. | last39=White | first39=G. J. | last40=Barrado | first40=D. | last41=Fukagawa | first41=M. | last42=Grün | first42=E. | last43=Kamp | first43=I. | last44=Lorente | first44=R. | last45=Morbidelli | first45=A. | last46=Müller | first46=S. | last47=Mutschke | first47=H. | last48=Nakagawa | first48=T. | last49=Ribas | first49=I. | last50=Walker | first50=H. | title=DUst around NEarby Stars. The survey observational results | journal=Astronomy & Astrophysics | volume=555 | page=A11 | date=July 2013 | doi=10.1051/0004-6361/201321050 | bibcode=2013A&A...555A..11E | arxiv=1305.0155 | s2cid=377244 | postscript=. }}</ref>

<ref name="apj687">{{citation | last1=Mamajek | first1=Eric E. | last2=Hillenbrand | first2=Lynne A. | title=Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics | journal=The Astrophysical Journal | volume=687 | issue=2 | pages=1264–1293 |date=November 2008 | doi=10.1086/591785 | bibcode=2008ApJ...687.1264M | arxiv = 0807.1686 | s2cid=27151456 | postscript=. }}</ref>

<ref name=mnras447_1_L75>{{citation | last1=Kennedy | first1=Grant M. | title=Nature or nurture of coplanar Tatooines: the aligned circumbinary Kuiper belt analogue around HD 131511 | journal=Monthly Notices of the Royal Astronomical Society: Letters | volume=447 | issue=1 | pages=L75–L79 | date=February 2015 | doi=10.1093/mnrasl/slu190 | doi-access=free | bibcode=2015MNRAS.447L..75K | postscript=. |arxiv = 1412.0674 | s2cid=53686506 }}</ref>

<ref name=aa570_A114>{{citation | display-authors=1 | last1=Marshall | first1=J. P. | last2=Kirchschlager | first2=F. | last3=Ertel | first3=S. | last4=Augereau | first4=J.-C. | last5=Kennedy | first5=G. M. | last6=Booth | first6=M. | last7=Wolf | first7=S. | last8=Montesinos | first8=B. | last9=Eiroa | first9=C. | last10=Matthews | first10=B. | title=Interpreting the extended emission around three nearby debris disc host stars | journal=Astronomy & Astrophysics | volume=570 | id=A114 | pages=13 | date=October 2014 | doi=10.1051/0004-6361/201424517 | bibcode=2014A&A...570A.114M | postscript=. |arxiv = 1408.5649 | s2cid=119232172 }}</ref>

<ref name=mnras349_1_1069>{{cite journal |doi=10.1111/j.1365-2966.2004.07588.x | title=Kinematics of chromospherically active binaries and evidence of an orbital period decrease in binary evolution | journal=Monthly Notices of the Royal Astronomical Society | volume=349 | issue=3 | pages=1069–1092 | bibcode=2004MNRAS.349.1069K |arxiv = astro-ph/0404219 | last1=Karataș | first1=Yüksel | last2=Bilir |first2=Selçuk | last3=Eker |first3=Zeki | last4=Demircan |first4=Osman | last5=Liebert |first5=James | last6=Hawley |first6=Suzanne L. | last7=Fraser |first7=Oliver J. | last8=Covey |first8=Kevin R. | last9=Lowrance |first9=Patrick | last10=Kirkpatrick |first10=J. Davy | last11=Burgasser |first11=Adam J. | year=2004 | doi-access=free | s2cid=15290475 }}</ref>

<ref name="MERMILLIOD">{{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> </references>

== External links == * {{ARICNS link|id=4c01173|label='''ARICNS''': 01173 (A)}} * [http://nstars.nau.edu/index.cfm?fuseaction=singleSearch.systemID&SystemID=1453p1909 '''NStars''': 1453+1909]{{dead link|date=January 2018 |bot=InternetArchiveBot |fix-attempted=yes }}

{{Stars of Boötes}} <!-- Properties --> [[Category:K-type main-sequence stars]] [[Category:Solar-type stars|Bootis, DE]] [[Category:RS Canum Venaticorum variables]] [[Category:Binary stars]] [[Category:Spectroscopic binaries]] <!-- Identifiers --> [[Category:Boötes]] [[Category:Durchmusterung objects]] [[Category:Gliese and GJ objects|0567]] [[Category:Henry Draper Catalogue objects|131511]] [[Category:Hipparcos objects|072848]] [[Category:Bright Star Catalogue objects|5553]] [[Category:Objects with variable star designations|Boötis, DE]]