| 释义 |
- References
{{Starbox begin
| name = 24 Cephei
}}{{Starbox observe
| epoch = J2000
| ra = {{RA|22|09|48.43010}}[1]
| dec = {{DEC|+72|20|28.3421}}[1]
| appmag_v = 4.79[3]
| constell = Cepheus
}}{{Starbox character
| class = G7 II-III[4]
| b-v = 0.898[5]
| u-b =
}}{{Starbox astrometry
| radial_v = −16.58[5]
| prop_mo_ra = +33.214[1]
| prop_mo_dec = +2.679[1]
| parallax = 8.3965
| p_error = 0.1332
| parallax_footnote = [1]
| absmag_v = −0.519[5]
}}{{Starbox detail
| source =
| mass = 3.50[11]
| radius = 13[12]
| luminosity = 209[11]
| gravity = {{Val|2.31|0.33}}[14]
| temperature = {{Val|5023|54|fmt=commas}}[14]
| metal_fe = {{Val|−0.16|0.11}}[14]
| rotational_velocity = 6.5[17]
| age_myr = 234[11]
}}{{Starbox catalog
| names = {{odlist | F=24 Cep | BD=+71° 1111 | FK5=837 | HD=210807 | HIP=109400 | HR=8468 | SAO=10265 }}
}}{{Starbox reference
| Simbad = 24+Cep
}}{{Starbox end}}24 Cephei is a single,[20] yellow-hued star in the northern circumpolar constellation of Cepheus. With an apparent visual magnitude of 4.79,[3] it is faintly visible to the naked eye. The distance to this star, based upon an annual parallax shift of {{Val|8.3965|ul=mas}},[1] is around 388 light years. It is moving closer with a heliocentric radial velocity of −17 km/s.[5]Keenan and McNeil (1989) listed a stellar classification of G7 II-III[4] for 24 Cep, matching the spectrum of an evolved G-type star with blended features of a bright giant and a giant star. Older sources list a class of G8 III,[25] which would suggest an ordinary giant star. At the age of 234 million years,[11] it has an estimated 3.5[11] times the mass of the Sun and has expanded to about 13[12] times the Sun's radius. The star is radiating 199[3] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,023 K.[14] These coordinates are a source of X-ray emission.[31] References1. ^1 2 3 4 5 6 {{cite DR2}}
2. ^1 2 3 {{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | postscript=. }}
3. ^1 2 {{citation | title=The Perkins catalog of revised MK types for the cooler stars | last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C. | journal=The Astrophysical Journal Supplement Series | volume=71 | pages=245 | year=1989 | bibcode=1989ApJS...71..245K | doi=10.1086/191373 }}
4. ^1 2 3 4 {{citation | last1=Koleva | first1=M. | last2=Vazdekis | first2=A. | title=Stellar population models in the UV. I. Characterisation of the New Generation Stellar Library | journal=Astronomy & Astrophysics | volume=538 | page=A143 | date=February 2012 | doi=10.1051/0004-6361/201118065 | bibcode=2012A&A...538A.143K | postscript=. | arxiv=1111.5449 }}
5. ^1 {{citation | last1=Haakonsen | first1=Christian Bernt | last2=Rutledge | first2=Robert E. | title=XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources | journal=The Astrophysical Journal Supplement |volume=184 | issue=1 | pages=138–151 | date=September 2009 | doi=10.1088/0067-0049/184/1/138 | bibcode=2009ApJS..184..138H | arxiv=0910.3229 | postscript=. }}
6. ^1 2 3 4 {{citation | display-authors=1 | last1=Soubiran | first1=C. | last2=Bienaymé | first2=O. | last3=Mishenina | first3=T. V. | last4=Kovtyukh | first4=V. V. | title=Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants | journal=Astronomy and Astrophysics | date=2008 | volume=480 | issue=1 | pages=91–101 | bibcode=2008A&A...480...91S | doi=10.1051/0004-6361:20078788 | arxiv=0712.1370 | postscript=. }}
7. ^1 {{citation | 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 | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | postscript=. }}
8. ^1 2 3 4 5 {{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 }}
9. ^1 {{citation | display-authors=1 | last1=Lèbre | first1=A. | last2=de Laverny | first2=P. | last3=Do Nascimento | first3=J. D., Jr. | last4=de Medeiros | first4=J. R. | title=Lithium abundances and rotational behavior for bright giant stars | journal=Astronomy and Astrophysics | postscript=. | volume=450 | issue=3 | pages=1173–1179 | date=May 2006 | doi=10.1051/0004-6361:20053485 | bibcode=2006A&A...450.1173L }}
10. ^1 2 {{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) | edition=Third | journal=Astronomy and Astrophysics | volume=367 | pages=521–524 |date=February 2001 | doi=10.1051/0004-6361:20000451 | bibcode=2001A&A...367..521P | arxiv=astro-ph/0012289 | postscript=. }}
11. ^1 {{citation | title=The Spectra of the Bright Stars of Types F5-K5 | last1=Roman | first1=Nancy G. | journal=Astrophysical Journal | postscript=. | volume=116 | pages=122–143 | year=1952 | bibcode=1952ApJ...116..122R | doi=10.1086/145598 }}
}}{{Stars of Cepheus}} 8 : G-type bright giants|G-type giants|Cepheus (constellation)|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |