Delta Leonis

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Delta Leonis

Location of δ Leonis (circled)

Observation data

Epoch J2000 Equinox J2000

Constellation Leo

Right ascension 11h 14m 06.50142s[1]

Declination 20° 31′ 25.3853″[1]

Apparent magnitude (V) 2.56[2]

Characteristics

Spectral type A4 V[3]

U−B color index +0.12[4]

B−V color index +0.12[4]

Variable type Delta Scuti

Astrometry

Radial velocity (R v) -20.2[2] km/s

Proper motion (μ) RA: +143.42[1] mas/yr

Dec.: -129.88[1] mas/yr

Parallax (π) 55.82 ± 0.25[1] mas

Distance 58.4 ± 0.3 ly

(17.91 ± 0.08 pc)

Delta LeonisFrom Wikipedia, the free encyclopedia

Delta Leonis (δ Leo, δ Leonis) is a star in the zodiac

constellation of Leo. It has the traditional names

Zosma (or Zozma) and Duhr. Rare spellings include

Zozca, Zosca, Zubra, and Dhur . The name Zosmameans girdle in ancient Greek, referring to the star's

location in its constellation, on the hip of the lion.[9]

Based upon parallax measurements, it lies at a

distance of about 58.4 light-years (17.9 parsecs) from

the Earth.[1]

Contents

1 Properties2 Name3 See also4 References

Properties

Zosma is a relatively ordinary main sequence star with a stellar classification of A4 V,[3] making it is

somewhat larger and hotter than the Sun. It is a fairly

well-studied star, allowing relatively accurate

measurements of its age and size. The radius of the

star, as measured directly using an interferometer, is

about 214% of the Sun's radius and it is emitting more

than 15 times as much luminosity as the Sun. The

energy is being emitted from the outer envelope with

an effective temperature 8,296 K,[6] giving it the white

hue characteristic of an A-type star. Having a larger

mass than the Sun it will have a shorter lifespan, and

in another 600 million years or so will swell into an

orange or red giant star before decaying quietly into a

white dwarf.[5]

This star is rotating rapidly, with a projected rotational

velocity of 180 km s−1. The inclination of the axis of

rotation to the line of sight from the Earth is estimated

at 38.1°, which would mean the azimuthal velocityalong the equator is about 280 km s−1. This rotation is

https://en.wikipedia.org/wiki/Milliarcsecondhttps://en.wikipedia.org/wiki/Yearhttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/Stellar_parallaxhttps://en.wikipedia.org/wiki/Stellar_rotationhttps://en.wikipedia.org/wiki/Stellar_rotationhttps://en.wikipedia.org/wiki/Stellar_rotationhttps://en.wikipedia.org/wiki/Stellar_rotationhttps://en.wikipedia.org/wiki/Stellar_rotationhttps://en.wikipedia.org/wiki/Stellar_rotationhttps://en.wikipedia.org/wiki/Proper_motionhttps://en.wikipedia.org/wiki/Stellar_rotationhttps://en.wikipedia.org/wiki/Stellar_rotationhttps://en.wikipedia.org/wiki/Stellar_rotationhttps://en.wikipedia.org/wiki/Stellar_rotationhttps://en.wikipedia.org/wiki/Earthhttps://en.wikipedia.org/wiki/Light-yearhttps://en.wikipedia.org/wiki/Parsechttps://en.wikipedia.org/wiki/Parallaxhttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/Constellationhttps://en.wikipedia.org/wiki/Leo_(constellation)https://en.wikipedia.org/wiki/File:Cercle_rouge_100%25.svghttps://en.wikipedia.org/wiki/File:Leo_IAU.svghttps://en.wikipedia.org/wiki/Azimuthhttps://en.wikipedia.org/wiki/Earthhttps://en.wikipedia.org/wiki/Stellar_rotationhttps://en.wikipedia.org/wiki/White_dwarfhttps://en.wikipedia.org/wiki/Red_gianthttps://en.wikipedia.org/wiki/A-type_starhttps://en.wikipedia.org/wiki/Effective_temperaturehttps://en.wikipedia.org/wiki/Solar_radiushttps://en.wikipedia.org/wiki/Interferometerhttps://en.wikipedia.org/wiki/Sunhttps://en.wikipedia.org/wiki/Stellar_classificationhttps://en.wikipedia.org/wiki/Main_sequencehttps://en.wikipedia.org/wiki/Earthhttps://en.wikipedia.org/wiki/Parsechttps://en.wikipedia.org/wiki/Light-yearhttps://en.wikipedia.org/wiki/Parallaxhttps://en.wikipedia.org/wiki/Lionhttps://en.wikipedia.org/wiki/Ancient_Greekhttps://en.wikipedia.org/wiki/Leo_(constellation)https://en.wikipedia.org/wiki/Constellationhttps://en.wikipedia.org/wiki/Zodiachttps://en.wikipedia.org/wiki/Starhttps://en.wikipedia.org/wiki/Parsechttps://en.wikipedia.org/wiki/Light-yearhttps://en.wikipedia.org/wiki/Distance_(astronomy)https://en.wikipedia.org/wiki/Milliarcsecondhttps://en.wikipedia.org/wiki/Stellar_parallaxhttps://en.wikipedia.org/wiki/Yearhttps://en.wikipedia.org/wiki/Milliarcsecondhttps://en.wikipedia.org/wiki/Yearhttps://en.wikipedia.org/wiki/Milliarcsecondhttps://en.wikipedia.org/wiki/Proper_motionhttps://en.wikipedia.org/wiki/Radial_velocityhttps://en.wikipedia.org/wiki/Astrometryhttps://en.wikipedia.org/wiki/Delta_Scuti_variableshttps://en.wikipedia.org/wiki/Variable_starhttps://en.wikipedia.org/wiki/Color_indexhttps://en.wikipedia.org/wiki/Color_indexhttps://en.wikipedia.org/wiki/Stellar_classificationhttps://en.wikipedia.org/wiki/Apparent_magnitudehttps://en.wikipedia.org/wiki/Declinationhttps://en.wikipedia.org/wiki/Right_ascensionhttps://en.wikipedia.org/wiki/Leo_(constellation)https://en.wikipedia.org/wiki/Constellationhttps://en.wikipedia.org/wiki/Equinox_(celestial_coordinates)https://en.wikipedia.org/wiki/Epoch_(astronomy)


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Details

Mass 2.2[5] M ☉

Radius 2.14 ± 0.040[6] R☉

Luminosity 15.5 ± 1.8[6] L☉

Surface gravity (log g ) 3.91[7]

cgs

Temperature 8,296[6] K

Rotational velocity (v sin

i )

180[8] km/s

Age 0.60-0.75[5] Gyr

Other designations

Zosma, Zozma, Zosca, Duhr, Zubra,[9] δ

Leo, 68 Leo, BD +21°2298, FK5 422,

GC 15438, GCTP 2614.00, Gl 419, HD

97603, HIP 54872, HR 4357, SAO

81727.[10]

Database references

SIMBAD data (http://simbad.u-

strasbg.fr/simbad/sim-id?

Ident=HD+97603)

producing an equatorial bulge, giving the star a

pronounced oblate spheroidal shape. The polar radius

is about 84% of the radius along the equator.[8]

Based upon the location and trajectory of this star

through space, it may be a member of the Ursa Major

Moving Group, a type of stellar kinematics group that

share a common origin and motion through space.[11]The age of this group is about 500 million years.[12]

Name

In Chinese,太微右垣 (Tài Wēi Yòu Yuán), meaning Right Wall of Supreme Palace Enclosure, refers to an

asterism consisting of δ Leonis, β Virginis, σ Leonis, ι

Leonis and θ Leonis.[13] Consequently, δ Leonis itself

is known as太微右垣五 (Tài Wēi Zuǒ Yuán wu,English: the Fifth Star of Right Wall of Supreme

Palace Enclosure.),[14] representing西上相(Xīshǎngxiāng), meaning The First Western

inister .[15] 西上相 (Xīshǎngxiāng), spelled Shang

Seang by R.H. Allen, means "the Higher Minister of

State" [16]

See also

List of stars in LeoClass A StarsDelta Scuti Variable Stars

References

1. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics

474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357

2. Wielen, R.; et al. (1999), Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars withdirect solutions (35), Astronomisches Rechen-Institut Heidelberg, Bibcode:1999VeARI..35....1W

3. Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications",

Astronomical Journal 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819

4. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and

Planetary Laboratory 4 (99), Bibcode:1966CoLPL...4...99J

5. Kaler, James B., ZOSMA (Delta Leonis), University of Illinois, retrieved 2010-05-12

6. Akeson, R. L.; et al. (February 2009), "Dust in the inner regions of debris disks around a stars", The

Astrophysical Journal 691 (2): 1896–1908, arXiv:0810.3701, Bibcode:2009ApJ...691.1896A,

doi:10.1088/0004-637X/691/2/1896

7. Malagnini, M. L.; Morossi, C. (November 1990), "Accurate absolute luminosities, effective temperatures,

radii, masses and surface gravities for a selected sample of field stars", Astronomy and AstrophysicsSupplement Series 85 (3): 1015–1019, Bibcode:1990A&AS...85.1015M

8. Royer, F.; et al. (2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of

v sin i in the northern hemisphere", Astronomy and Astrophysics 393 (3): 897–911, arXiv:astro-ph/0205255,

Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943

https://dx.doi.org/10.1051%2F0004-6361%3A20020943https://en.wikipedia.org/wiki/Digital_object_identifierhttp://adsabs.harvard.edu/abs/2002A&A...393..897Rhttps://en.wikipedia.org/wiki/Bibcodehttps://arxiv.org/abs/astro-ph/0205255https://en.wikipedia.org/wiki/ArXivhttp://adsabs.harvard.edu/abs/1990A&AS...85.1015Mhttps://en.wikipedia.org/wiki/Bibcodehttps://dx.doi.org/10.1088%2F0004-637X%2F691%2F2%2F1896https://en.wikipedia.org/wiki/Digital_object_identifierhttp://adsabs.harvard.edu/abs/2009ApJ...691.1896Ahttps://en.wikipedia.org/wiki/Bibcodehttps://arxiv.org/abs/0810.3701https://en.wikipedia.org/wiki/ArXivhttp://stars.astro.illinois.edu/sow/zosma.htmllhttp://adsabs.harvard.edu/abs/1966CoLPL...4...99Jhttps://en.wikipedia.org/wiki/Bibcodehttps://dx.doi.org/10.1086%2F110819https://en.wikipedia.org/wiki/Digital_object_identifierhttp://adsabs.harvard.edu/abs/1969AJ.....74..375Chttps://en.wikipedia.org/wiki/Bibcodehttp://adsabs.harvard.edu/abs/1999VeARI..35....1Whttps://en.wikipedia.org/wiki/Bibcodehttps://dx.doi.org/10.1051%2F0004-6361%3A20078357https://en.wikipedia.org/wiki/Digital_object_identifierhttp://adsabs.harvard.edu/abs/2007A&A...474..653Vhttps://en.wikipedia.org/wiki/Bibcodehttps://arxiv.org/abs/0708.1752https://en.wikipedia.org/wiki/ArXivhttps://en.wikipedia.org/wiki/Variable_star#Delta_Scuti_variableshttps://en.wikipedia.org/wiki/Stellar_classification#Class_Ahttps://en.wikipedia.org/wiki/List_of_stars_in_Leohttps://en.wikipedia.org/wiki/Theta_Leonishttps://en.wikipedia.org/wiki/Iota_Leonishttps://en.wikipedia.org/wiki/Sigma_Leonishttps://en.wikipedia.org/wiki/Beta_Virginishttps://en.wikipedia.org/wiki/Supreme_Palace_enclosurehttps://en.wikipedia.org/wiki/Chinese_languagehttps://en.wikipedia.org/wiki/Stellar_kinematicshttps://en.wikipedia.org/wiki/Ursa_Major_Moving_Grouphttps://en.wikipedia.org/wiki/Oblate_spheroidhttp://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+97603https://en.wikipedia.org/wiki/SIMBADhttps://en.wikipedia.org/wiki/Smithsonian_Astrophysical_Observatory_Star_Cataloghttps://en.wikipedia.org/wiki/Harvard_Revised_cataloguehttps://en.wikipedia.org/wiki/Hipparcos_cataloguehttps://en.wikipedia.org/wiki/Henry_Draper_cataloguehttps://en.wikipedia.org/wiki/Henry_L._Giclas_cataloguehttps://en.wikipedia.org/wiki/General_Catalogue_of_Trigonometric_Parallaxeshttps://en.wikipedia.org/wiki/Boss_General_Cataloguehttps://en.wikipedia.org/wiki/Catalogues_of_Fundamental_Starshttps://en.wikipedia.org/wiki/Bonner_Durchmusterunghttps://en.wikipedia.org/wiki/Flamsteed_designationhttps://en.wikipedia.org/wiki/Bayer_designationhttps://en.wikipedia.org/wiki/Star_cataloguehttps://en.wikipedia.org/wiki/Gigayearhttps://en.wikipedia.org/wiki/Stellar_evolutionhttps://en.wikipedia.org/wiki/Projected_rotational_velocityhttps://en.wikipedia.org/wiki/Kelvinhttps://en.wikipedia.org/wiki/Effective_temperaturehttps://en.wikipedia.org/wiki/Centimetre%E2%80%93gram%E2%80%93second_system_of_unitshttps://en.wikipedia.org/wiki/Surface_gravityhttps://en.wikipedia.org/wiki/Solar_luminosityhttps://en.wikipedia.org/wiki/Luminosityhttps://en.wikipedia.org/wiki/Solar_radiushttps://en.wikipedia.org/wiki/Radiushttps://en.wikipedia.org/wiki/Solar_masshttps://en.wikipedia.org/wiki/Mass


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Categories: Bayer objects Leo (constellation) A-type main-sequence stars Stars with proper names

This page was last modified on 21 August 2015, at 02:08.Text is available under the Creative Commons Attribution-ShareAlike License; additional termsmay apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia® is aregistered trademark of the Wikimedia Foundation, Inc., a non-profit organization.

9. Allen, Richard Hinckley (1899), Star-names and their meanings, G. E. Stechert, p. 260

10. "del Leo -- Variable Star", SIMBAD (Centre de Données astronomiques de Strasbourg), retrieved 2010-05-12

11. Nakajima, Tadashi; Morino, Jun-Ichi; Fukagawa, Misato (September 2010), "Potential Members of Stellar

Kinematical Groups within 20 pc of the Sun", The Astronomical Journal 140 (3): 713–722,

Bibcode:2010AJ....140..713N, doi:10.1088/0004-6256/140/3/713

12. King, Jeremy R.; et al. (April 2003), "Stellar Kinematic Groups. II. A Reexamination of the Membership,

Activity, and Age of the Ursa Major Group", The Astronomical Journal 125 (4): 1980–2017,

Bibcode:2003AJ....125.1980K, doi:10.1086/368241

13. (Chinese) 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.

14. (Chinese) 香港太空館 -研究資源 -亮星中英對照表

(http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_t_z.htm), Hong

Kong Space Museum. Accessed on line November 23, 2010.

15. (Chinese) English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name

(http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/e_research_chinengstarzone_b.htm#Supreme

PalaceEnclosure), Hong Kong Space Museum. Accessed on line November 23, 2010.

16. [1]

(http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Leo*.html)
http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Leo*.htmlhttp://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/e_research_chinengstarzone_b.htm#SupremePalaceEnclosurehttp://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_t_z.htmhttps://en.wikipedia.org/wiki/Special:BookSources/9789867332257https://dx.doi.org/10.1086%2F368241https://en.wikipedia.org/wiki/Digital_object_identifierhttp://adsabs.harvard.edu/abs/2003AJ....125.1980Khttps://en.wikipedia.org/wiki/Bibcodehttps://dx.doi.org/10.1088%2F0004-6256%2F140%2F3%2F713https://en.wikipedia.org/wiki/Digital_object_identifierhttp://adsabs.harvard.edu/abs/2010AJ....140..713Nhttps://en.wikipedia.org/wiki/Bibcodehttp://simbad.u-strasbg.fr/simbad/sim-id?Ident=delta+leohttp://books.google.com/books?id=5xQuAAAAIAAJ&pg=PA260https://www.wikimediafoundation.org/https://wikimediafoundation.org/wiki/Privacy_policyhttps://wikimediafoundation.org/wiki/Terms_of_Usehttps://en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_Licensehttps://en.wikipedia.org/wiki/Category:Stars_with_proper_nameshttps://en.wikipedia.org/wiki/Category:A-type_main-sequence_starshttps://en.wikipedia.org/wiki/Category:Leo_(constellation)https://en.wikipedia.org/wiki/Category:Bayer_objectshttps://en.wikipedia.org/wiki/Help:Categoryhttps://en.wikipedia.org/w/index.php?title=Delta_Leonis&oldid=677091344

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