Rho Draconis

{{Short description|Star in the constellation Draco}} {{Starbox begin}} {{Starbox image | image = {{Location mark |image=Draco constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=ρ Draconis |x=110|y=465 }} | caption = Location of ρ Draconis (circled in red) }} {{Starbox observe | epoch = [[J2000.0]] | equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]]) | constell = [[Draco (constellation)|Draco]] | ra = {{RA|20|02|49.07085}}<ref name=dr3/> | dec = {{DEC|+67|52|24.8308}}<ref name=dr3/> | appmag_v = 4.52<ref name=Argue1966/> }} {{Starbox character | type = [[red giant branch]]<ref name=dr3/> | class = K3 III<ref name=PasinettiFracassini2001/> | b-v = +1.34<ref name=Argue1966/> | u-b = +1.54<ref name=Argue1966/> | r-i = | variable = }} {{Starbox astrometry | radial_v = {{Val|−9.80|0.43}}<ref name=Famaey2005/> | prop_mo_ra = +15,824<ref name=dr3/> | prop_mo_dec = +47.749<ref name=dr3/> | parallax = 7.5052 | p_error = 0.0993 | parallax_footnote = <ref name=dr3/> | absmag_v = −0.97<ref name=Ryon2009/> }} {{Starbox detail | source = | mass = | radius = 28<ref name=PasinettiFracassini2001/> | luminosity = 402<ref name=mcdonald2012/> | temperature = 4370<ref name=Mishenina1995/> | gravity = 1.90<ref name=Mishenina1995/> | metal_fe = 0.03<ref name=Mishenina1995/> | rotational_velocity = 10<ref name=Bernacca1970/> | age_gyr = }} {{Starbox catalog | names = {{odlist|B=ρ Dra | F=67 Dra | BD=+67°1222 | FK5= | HD=190940 | HIP=98702 | HR=7685 | SAO=18676 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = rho+Dra }} {{Starbox end}} '''Rho Draconis''' ('''ρ Draconis''') is a solitary<ref name=Eggleton2008/> [[star]] in the northern [[circumpolar constellation]] of [[Draco (constellation)|Draco]]. It is faintly visible to the naked eye with an [[apparent visual magnitude]] of 4.52. Based upon an annual [[stellar parallax|parallax shift]] of {{val|7.5|ul=mas}} as measured from Earth, it is located around 435 [[light year]]s from the [[Sun]]. At that distance, the visual magnitude of the star is diminished by an [[extinction (astronomy)|extinction factor]] of 0.027 due to [[interstellar dust]].<ref name=Ryon2009/>

With a [[stellar classification]] of K3 III,<ref name=PasinettiFracassini2001/> Rho Draconis is a normal [[giant star]] that is past the first [[dredge-up]] phase of its post-[[main sequence]] [[stellar evolution|evolution]].<ref name=Mishenina1995/> It has the peculiar [[spectrum]] of a [[CN star]], showing abnormal [[absorption line|line strengths]] for [[cyanogen]] and calcium.<ref name=Mishenina1997/> The star has expanded to around 28<ref name=PasinettiFracassini2001/> times the [[Sun's radius]] and it is radiating 402<ref name=mcdonald2012/> times the [[solar luminosity]] from its [[photosphere]] at an [[effective temperature]] of 4,370 K.<ref name=Mishenina1995/>

==References== <references>

<ref name=Mishenina1997>{{citation | title=Li and CNO abundances in the atmospheres of nine peculiar giants | last1=Mishenina | first1=T. V. | last2=Tsymbal | first2=V. V. | journal=Astronomy Letters | volume=23 | issue=5 | pages=609–614 | date=September 1997 | bibcode=1997AstL...23..609M | postscript=. }}</ref>

<ref name=PasinettiFracassini2001>{{citation | display-authors=1 | 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) | journal=Astronomy and Astrophysics | edition=3rd | volume=367 | pages=521–524 | date=February 2001 | doi=10.1051/0004-6361:20000451 | bibcode=2001A&A...367..521P | arxiv=astro-ph/0012289 | s2cid=425754 | postscript=. }}</ref>

<ref name=Ryon2009>{{citation | title=Comparing the Ca ii H and K Emission Lines in Red Giant Stars | postscript=. | display-authors=1 | last1=Ryon | first1=Jenna | last2=Shetrone | first2=Matthew D. | last3=Smith | first3=Graeme H. | journal=Publications of the Astronomical Society of the Pacific | volume=121 | issue=882 | page=842 | date=August 2009 | doi=10.1086/605456 | bibcode=2009PASP..121..842R |arxiv = 0907.3346 | s2cid=17821279 }}</ref>

<ref name=mcdonald2012>{{citation | display-authors=1 | last1=McDonald | first1= I. | last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L. | title=Fundamental parameters and infrared excesses of Hipparcos stars | journal=Monthly Notices of the Royal Astronomical Society | volume=427 | pages=343–357 | year=2012 | issue=1 | bibcode=2012MNRAS.427..343M | doi=10.1111/j.1365-2966.2012.21873.x | doi-access=free | arxiv=1208.2037 | s2cid=118665352 | postscript=. }}</ref>

<ref name=Famaey2005>{{citation | display-authors=1 | last1=Famaey | first1=B. | last2=Jorissen | first2=A. | last3=Luri | first3=X. | last4=Mayor | first4=M. | last5=Udry | first5=S. | last6=Dejonghe | first6=H. | last7=Turon | first7=C. | title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters | journal=Astronomy and Astrophysics | volume=430 | pages=165–186 | date=2005 | doi=10.1051/0004-6361:20041272 | bibcode=2005A&A...430..165F | arxiv=astro-ph/0409579 | s2cid=17804304 | postscript=. }}</ref>

<ref name=Bernacca1970>{{citation | last1=Bernacca | first1=P. L. | last2=Perinotto | first2=M. | title=A catalogue of stellar rotational velocities | journal=Contributi Osservatorio Astronomico di Padova in Asiago | volume=239 | issue=1 | year=1970 | page=1 | bibcode=1970CoAsi.239....1B | postscript=. }}</ref>

<ref name=Argue1966>{{citation | last1=Argue | first1=A. N. | postscript=. | title=UBV photometry of 550 F, G and K type stars | journal=[[Monthly Notices of the Royal Astronomical Society]] | volume=133 | pages=475–493 | year=1966 | issue=4 | bibcode=1966MNRAS.133..475A | doi=10.1093/mnras/133.4.475| doi-access=free}}</ref>

<ref name=Mishenina1995>{{citation | title=Chemical composition of five giants with positive CN-indices. | display-authors=1 | last1=Mishenina | first1=T. V. | last2=Kutsenko | first2=S. V. | last3=Musaev | first3=F. A. | journal=Astronomy and Astrophysics Supplement | volume=113 | page=333 | date=October 1995 | bibcode=1995A&AS..113..333M | postscript=. }}</ref>

<ref name=Eggleton2008>{{cite journal | 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 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}</ref>

<ref name=SIMBAD>{{cite simbad | title=rho Dra | access-date=2017-05-30 }}</ref> </references>

[[Category:K-type giants]] [[Category:Draco (constellation)]] [[Category:Bayer objects|Draconis, Rho]] [[Category:Durchmusterung objects|BD+67 1222]] [[Category:Flamsteed objects|Draconis, 67]] [[Category:Henry Draper Catalogue objects|190940]] [[Category:Hipparcos objects|098702]] [[Category:Bright Star Catalogue objects|7685]]