| 词条 | 45 Draconis |
| 释义 |
|name= 45 Draconis }}{{Starbox image | image={{Location mark |image=Draco constellation map.svg |float=center |alt= |label= |position=right |width=280 |mark=Red circle.svg |mark_width=10 |mark_link=45 Draconis |x=139|y=798 }} |caption=Location of 45 Dra (circled) }}{{Starbox observe | epoch = J2000 | ra = {{RA|18|32|34.52197}}[1] | dec = {{DEC|+57|02|44.1416}}[1] | appmag_v = 4.78[2] |constell= Draco }}{{Starbox character | class = F7Ib[4] | b-v = +0.59[2] | u-b = | variable = }}{{Starbox astrometry | radial_v = −12.50[3] | prop_mo_ra = 0.400[1] | prop_mo_dec = −7.674[1] | parallax = 0.9287 | p_error = 0.0913 | parallax_footnote = [1] | absmag_v = −3.5[4] }}{{Starbox detail | mass = 8.2[5] | radius = 62[6] | luminosity = 5,450[7] | temperature = 6,151[4] | gravity = 2.1[5] - 2.4[4] | metal_fe = −0.04[4] | rotational_velocity = 10[5] | age_myr = 33[8] }}{{Starbox catalog | names = {{odlist | B=d Draconis | F=45 Dra | BD=+56° 2113 | FK5=3475 | HD=171635 | HIP=90905 | HR=6978 | SAO=31039 }}[9] }}{{Starbox reference | Simbad=45+Draconis }}{{Starbox end}}45 Draconis is a single[10] star located in the northern circumpolar constellation of Draco, around 3,500 light years from the Earth.[1] 45 Draconis is the Flamsteed designation, while it has the Bayer designation of d Draconis. This object is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 4.78.[2] Radial velocity measurements indicate it is moving closer to the Sun at the rate of −12.5 km/s.[3] Lyubimkov et al. (2012) assigned this star a stellar classification of F7Ib,[5] matching an F-type supergiant. It is approximately 33 million years old with 8.2[5] times the mass of the Sun and about 62[6] times the Sun's radius. The star is radiating 5,450[7] times the Sun's luminosity from its photosphere at an effective temperature of 6,151 K.[4] References1. ^1 2 3 4 5 {{cite DR2}} {{Stars of Draco}}2. ^1 2 {{cite journal|bibcode=2014AJ....147..137L|title=Parameters and Abundances in Luminous Stars|journal=The Astronomical Journal|volume=147|issue=6|pages=137|author1=Luck|first1=R. Earle|year=2014|doi=10.1088/0004-6256/147/6/137}} 3. ^1 {{cite journal|bibcode=2006AstL...32..759G|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|journal=Astronomy Letters|volume=32|issue=11|pages=759|author1=Gontcharov|first1=G. A.|year=2006|doi=10.1134/S1063773706110065|arxiv = 1606.08053 }} 4. ^1 2 3 4 {{cite journal|bibcode=2012MNRAS.423.3268K|arxiv=1204.4115|title=Accurate luminosities from the oxygen λ7771-4 Å triplet and the fundamental parameters of F-G supergiants|journal=Monthly Notices of the Royal Astronomical Society|volume=423|issue=4|pages=3268|author1=Kovtyukh|first1=V. V.|last2=Gorlova|first2=N. I.|last3=Belik|first3=S. I.|year=2012|doi=10.1111/j.1365-2966.2012.21117.x}} 5. ^1 2 3 4 5 {{cite journal|bibcode=2012MNRAS.427...11L|title=Lithium abundance in atmospheres of F- and G-type supergiants and bright giants|journal=Monthly Notices of the Royal Astronomical Society|volume=427|pages=11|author1=Lyubimkov|first1=Leonid S.|last2=Lambert|first2=David L.|last3=Kaminsky|first3=Bogdan M.|last4=Pavlenko|first4=Yakov V.|last5=Poklad|first5=Dmitry B.|last6=Rachkovskaya|first6=Tamara M.|year=2012|doi=10.1111/j.1365-2966.2012.21617.x|arxiv = 1212.6057 }} 6. ^1 {{cite journal|bibcode= 2001A&A...367..521P|title= Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics|journal= Astronomy and Astrophysics|volume= 367|issue= 2|pages= 521|author1= Pasinetti Fracassini|first1= L. E.|last2= Pastori|first2= L.|last3= Covino|first3= S.|last4= Pozzi|first4= A.|year= 2001|doi= 10.1051/0004-6361:20000451|arxiv = astro-ph/0012289 }} 7. ^1 {{cite journal|bibcode= 2012MNRAS.427..343M|title= Fundamental parameters and infrared excesses of Hipparcos stars|journal= Monthly Notices of the Royal Astronomical Society|volume= 427|pages= 343|author1= McDonald|first1= I.|last2= Zijlstra|first2= A. A.|last3= Boyer|first3= M. L.|year= 2012|doi= 10.1111/j.1365-2966.2012.21873.x|arxiv = 1208.2037 }} 8. ^{{cite journal|bibcode=2010MNRAS.402.1369L|arxiv=0911.1335|title=Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood|journal=Monthly Notices of the Royal Astronomical Society|volume=402|issue=2|pages=1369|author1=Lyubimkov|first1=Leonid S.|last2=Lambert|first2=David L.|last3=Rostopchin|first3=Sergey I.|last4=Rachkovskaya|first4=Tamara M.|last5=Poklad|first5=Dmitry B.|year=2010|doi=10.1111/j.1365-2966.2009.15979.x}} 9. ^{{cite simbad | title=d Dra | access-date=2018-07-24 }} 10. ^{{citation | title=A catalogue of multiplicity among bright stellar systems | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869 | date=2008 | doi=10.1111/j.1365-2966.2008.13596.x | postscript=. | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 }} 8 : F-type supergiants|Draco (constellation)|Bayer objects|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |
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