Nomenclature
δ Draconis (Latinised to Delta Draconis) is the star's Bayer designation.
It bore the traditional names Aldib, Altais[20] (the goat) and Nodus Secundus.[21] The title Altais was derived from Arabic Al Tāis "the Goat", the association of this star, along with Pi Draconis, Rho Draconis and Epsilon Draconis (Tyl).[28] According to a 1971 NASA catalog of stars, Al Tāis or Tais were the title for three stars : Delta Draconis as Altais, Pi Draconis as Tais I and Rho Draconis as Tais II (exclude Epsilon Draconis).[29] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[2] to catalogue and standardize proper names for stars. The WGSN approved the name Altais for this star on 21 August 2016 and it is now so included in the List of IAU-approved Star Names.[1]
In Chinese, {{lang|zh|天廚}} ({{lang|zh-Latn|Tiān Chú, Tien Choo}}), meaning Celestial Kitchen or Heaven's Kitchen, refers to an asterism consisting of Delta Draconis, Sigma Draconis, Epsilon Draconis, Rho Draconis, 64 Draconis and Pi Draconis.[3] Consequently, Delta Draconis itself is known as {{lang|zh|天廚一}} ({{lang|zh-Latn|Tiān Chú yī}}, {{lang-en|the First Star of Celestial Kitchen}}).[4]
Properties
Delta Draconis is a giant star with a stellar classification of G9 III. This indicates that, at an estimated age of 800 million years,[11] it has exhausted the supply of hydrogen at its core and entered a later stage in its evolution. The angular diameter of the star is estimated as {{nowrap|3.37 ± 0.06 mas}}.[35] At a parallax of 32.54 mas, this corresponds to a physical radius equal to 11 times the solar radius.[13] It is radiating 59[11] times the luminosity of the Sun from its outer atmosphere at an effective temperature of 4,820 K.[15] At this temperature, it is giving off the yellow-hued glow of a G-type star.[39] With a mass 2.32[11] times that of the Sun, this star will end its life as a white dwarf.[21]
Pole star
Delta Draconis is the northern pole star of Ceres, lying 1.5 degrees from the true pole.[5]
References
1. ^1 {{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |accessdate=4 March 2018}}
2. ^{{citation | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN) | publisher=International Astronomical Union | accessdate=22 May 2016 | postscript=. }}
3. ^{{zh icon}} 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, {{ISBN|978-986-7332-25-7}}.
4. ^{{zh icon}} 香港太空館 - 研究資源 - 亮星中英對照表 {{webarchive |url=https://web.archive.org/web/20081025110153/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_ala_alz.htm |date=October 25, 2008 }}, Hong Kong Space Museum. Accessed on line November 23, 2010.
5. ^[https://nesf2015.arc.nasa.gov/sites/default/files/downloads/pdf/05.pdf Dawn explores Ceres: Results from the survey orbit]
6. ^1 {{cite book | last=Wilson | first=Ralph Elmer | date=1953 | title=General Catalogue of Stellar Radial Velocities | publisher=Carnegie Institution of Washington | location=Washington | bibcode=1953GCRV..C......0W }}
7. ^1 {{cite web | title=del Dra -- Star in double system | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=del+Dra | accessdate=2010-04-06 }}
8. ^1 2 3 4 {{cite journal | last=McWilliam | first=Andrew | title=High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances | journal=Astrophysical Journal Supplement Series | volume=74 |date=December 1990 | pages=1075–1128 | doi=10.1086/191527 | bibcode=1990ApJS...74.1075M }}
9. ^1 {{cite journal | title=The Spectra of the Bright Stars of Types F5-K5 | last=Roman | first=Nancy G. | journal=Astrophysical Journal | volume=116 | page=122 |date=July 1952 | doi=10.1086/145598 | bibcode=1952ApJ...116..122R }}
10. ^1 {{cite journal | author=Bernacca, P. L. | author2=Perinotto, M. | title=A catalogue of stellar rotational velocities | journal=Contributi Osservatorio Astronomico di Padova in Asiago | volume=239 | issue=1 | date=1970 | bibcode=1970CoAsi.239....1B | page=1 }}
11. ^1 2 3 4 {{cite journal | last=Johnson|first=H. L. | last2=Mitchell | last3=Iriarte | last4=Wisniewski | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | date=1966 | bibcode=1966CoLPL...4...99J | page=99 }}
12. ^1 {{cite journal | last=Di Benedetto | first=G. P. | title=Predicting accurate stellar angular diameters by the near-infrared surface brightness technique | journal=Monthly Notices of the Royal Astronomical Society | volume=357 | issue=1 | pages=174–190 |date=February 2005 | doi=10.1111/j.1365-2966.2005.08632.x | bibcode=2005MNRAS.357..174D }}
13. ^1 2 {{cite book | first=Michael E. | last=Bakich | date=1995 | title=The Cambridge guide to the constellations | page=184 | publisher=Cambridge University Press | isbn=0-521-44921-9 }}
14. ^1 2 3 {{cite web | first=James B. | last=Kaler | authorlink=James B. Kaler | title=Nodus Secundus | work=STARS | publisher=University of Illinois | url=http://stars.astro.illinois.edu/sow/nodus2.html | accessdate=2010-04-06 }}
15. ^1 2 The Sun has a radius of 0.004652 AU. Thus::Stellar diameter = {{nowrap|1 AU × angular diameter/parallax}} = {{nowrap|3.37/32.54 AU}} = 0.10 AU = {{Solar radius|link=y|22}}.See: {{cite web |author=Lochner, Jim |author2=Gibb, Meredith |author3=Newman, Phil |date=January 30, 2006 |title=Using Optical Observations to find the Diameter of HT Cas |publisher=NASA |url=http://imagine.gsfc.nasa.gov/YBA/HTCas-size/optical.html |accessdate=2010-04-06 |deadurl=yes |archiveurl=https://web.archive.org/web/20100601221840/http://imagine.gsfc.nasa.gov/YBA/HTCas-size/optical.html |archivedate=2010-06-01 |df= }}
16. ^1 {{cite book | last=Allen | first=R. H. | date=1963 | authorlink=Richard Hinckley Allen | title=Star Names: Their Lore and Meaning | url=http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Draco*.html | accessdate=2010-12-12 | edition=Reprint | publisher=Dover Publications Inc. | location=New York, NY | isbn=0-486-21079-0 | page=209}}
17. ^1 {{cite web | url=https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720005197_1972005197.pdf | first1=Jack W. | last1=Rhoads | title=Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars | publisher=Jet Propulsion Laboratory, California Institute of Technology | date=November 15, 1971 }}
18. ^1 2 3 4 5 6 7 {{citation | display-authors=1 | last1=Takeda | first1=Yoichi | last2=Sato | first2=Bun'ei | last3=Murata | first3=Daisuke | title=Stellar Parameters and Elemental Abundances of Late-G Giants | journal=Publications of the Astronomical Society of Japan | volume=60 | issue=4 | pages=781–802 |date=August 2008 | bibcode=2008PASJ...60..781T |arxiv = 0805.2434 | doi=10.1093/pasj/60.4.781}}
19. ^1 {{citation |title=The Colour of Stars |date=December 21, 2004 |work=Australia Telescope, Outreach and Education |publisher=Commonwealth Scientific and Industrial Research Organisation |url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |accessdate=2012-01-16 |deadurl=yes |archiveurl=https://www.webcitation.org/6630AbtJZ?url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archivedate=March 10, 2012 |df= }}