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Delta Leonis From 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 Zosma means 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 lightyears (17.9 parsecs) from the Earth.[1]
Delta Leonis
Contents 1 2 3 4
Properties Name See also References Location of δ Leonis (circled)
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 wellstudied 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 Atype 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 velocity along the equator is about 280 km s−1. This rotation is
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 (Rv)
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)
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]
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
Name
Rotational velocity (v sin 180[8] km/s
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 Minister.[15] 西上相 (Xīshǎngxiāng), spelled Shang Seang by R.H. Allen, means "the Higher Minister of State" [16]
Age
See also
i)
0.600.75[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/simid? Ident=HD+97603)
List of stars in Leo Class A Stars Delta 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:10.1051/00046361:20078357 2. Wielen, R.; et al. (1999), Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions (35), Astronomisches RechenInstitut 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 20100512 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:10.1088/0004637X/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 Astrophysics Supplement Series 85 (3): 1015–1019, Bibcode:1990A&AS...85.1015M 8. Royer, F.; et al. (2002), "Rotational velocities of Atype stars in the northern hemisphere. II. Measurement of v sin i in the northern hemisphere", Astronomy and Astrophysics 393 (3): 897–911, arXiv:astroph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/00046361:20020943
9. Allen, Richard Hinckley (1899), Starnames and their meanings, G. E. Stechert, p. 260 10. "del Leo Variable Star", SIMBAD (Centre de Données astronomiques de Strasbourg), retrieved 20100512 11. Nakajima, Tadashi; Morino, JunIchi; Fukagawa, Misato (September 2010), "Potential of Stellar Kinematical Groups within 20 pc of the Sun", The Astronomical Journal 140 (3): 713–722, Bibcode:2010AJ....140..713N, doi:10.1088/00046256/140/3/713 12. King, Jeremy R.; et al. (April 2003), "Stellar Kinematic Groups. II. A Reexamination of the hip, 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 978986 7332257. 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) EnglishChinese 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)
Retrieved from "https://en.wikipedia.org/w/index.php?title=Delta_Leonis&oldid=677091344" Categories: Bayer objects Leo (constellation) Atype mainsequence stars Stars with proper names This page was last modified on 21 August 2015, at 02:08. Text is available under the Creative Commons AttributionShareAlike License; additional may apply. By using this site, you agree to the of Use and Privacy Policy. Wikipedia® is a ed trademark of the Wikimedia Foundation, Inc., a nonprofit organization.
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 Zosma means 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 lightyears (17.9 parsecs) from the Earth.[1]
Delta Leonis
Contents 1 2 3 4
Properties Name See also References Location of δ Leonis (circled)
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 wellstudied 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 Atype 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 velocity along the equator is about 280 km s−1. This rotation is
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 (Rv)
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)
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]
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
Name
Rotational velocity (v sin 180[8] km/s
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 Minister.[15] 西上相 (Xīshǎngxiāng), spelled Shang Seang by R.H. Allen, means "the Higher Minister of State" [16]
Age
See also
i)
0.600.75[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/simid? Ident=HD+97603)
List of stars in Leo Class A Stars Delta 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:10.1051/00046361:20078357 2. Wielen, R.; et al. (1999), Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions (35), Astronomisches RechenInstitut 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 20100512 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:10.1088/0004637X/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 Astrophysics Supplement Series 85 (3): 1015–1019, Bibcode:1990A&AS...85.1015M 8. Royer, F.; et al. (2002), "Rotational velocities of Atype stars in the northern hemisphere. II. Measurement of v sin i in the northern hemisphere", Astronomy and Astrophysics 393 (3): 897–911, arXiv:astroph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/00046361:20020943
9. Allen, Richard Hinckley (1899), Starnames and their meanings, G. E. Stechert, p. 260 10. "del Leo Variable Star", SIMBAD (Centre de Données astronomiques de Strasbourg), retrieved 20100512 11. Nakajima, Tadashi; Morino, JunIchi; Fukagawa, Misato (September 2010), "Potential of Stellar Kinematical Groups within 20 pc of the Sun", The Astronomical Journal 140 (3): 713–722, Bibcode:2010AJ....140..713N, doi:10.1088/00046256/140/3/713 12. King, Jeremy R.; et al. (April 2003), "Stellar Kinematic Groups. II. A Reexamination of the hip, 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 978986 7332257. 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) EnglishChinese 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)
Retrieved from "https://en.wikipedia.org/w/index.php?title=Delta_Leonis&oldid=677091344" Categories: Bayer objects Leo (constellation) Atype mainsequence stars Stars with proper names This page was last modified on 21 August 2015, at 02:08. Text is available under the Creative Commons AttributionShareAlike License; additional may apply. By using this site, you agree to the of Use and Privacy Policy. Wikipedia® is a ed trademark of the Wikimedia Foundation, Inc., a nonprofit organization.
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