Denebola
Multiple star β Leonis / Denebola |
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The positions of the components to each other (A = Denebola) | |||||||||||||||||||||||
AladinLite | |||||||||||||||||||||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
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Constellation | lion | ||||||||||||||||||||||
Right ascension | 11 h 49 m 3.58 s | ||||||||||||||||||||||
declination | + 14 ° 34 ′ 19.4 ″ | ||||||||||||||||||||||
Apparent brightness | 2.14 mag | ||||||||||||||||||||||
Typing | |||||||||||||||||||||||
B − V color index | +0.09 | ||||||||||||||||||||||
U − B color index | +0.07 | ||||||||||||||||||||||
R − I index | +0.02 | ||||||||||||||||||||||
Spectral class | A3 V | ||||||||||||||||||||||
Variable star type | DTCTC | ||||||||||||||||||||||
Astrometry | |||||||||||||||||||||||
Radial velocity | (−0.2 ± 0.5) km / s | ||||||||||||||||||||||
parallax | (90.91 ± 0.52) mas | ||||||||||||||||||||||
distance | (35.88 ± 0.21) ly (11.00 ± 0.06) pc |
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Visual absolute brightness M vis | +1.93 mag | ||||||||||||||||||||||
Proper movement | |||||||||||||||||||||||
Rec. Share: | (−497.68 ± 0.87) mas / a | ||||||||||||||||||||||
Dec. portion: | (−114.67 ± 0.44) mas / a | ||||||||||||||||||||||
Physical Properties | |||||||||||||||||||||||
radius | 1.728 R ☉ | ||||||||||||||||||||||
Luminosity |
vis. approx. 15 L ☉ |
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Effective temperature | approx. 9000 K | ||||||||||||||||||||||
Other names and catalog entries |
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Denebola or β Leonis is the third brightest star in the constellation Leo with an apparent magnitude of 2.14 mag . It belongs to the spectral class A3V and is 36 light years away. The star is surrounded by a disk of dust. No companions of Beta Leonis are proven; the WDS lists three components with angular distances between 40 ″ and 240 ″.
The name Denebola comes from the Arabic and is an abbreviation ofذنب الاسد ðanab al-asad , which means something like the lion's tail .
The IAU has the historical proper names on 30 June 2016 Denebola defined as standardized proper names. However, it should be noted that this proper name is only valid for the visually brightest component A. All other stars or components of this multiple star system therefore have no proper names (yet).
Components
Denebola is a quadruple system according to the “Catalog of Components of Double & Multiple stars”.
The four-fold system consists of:
component | Right ascension | declination | vis. Brightness (mag) | Reference point |
Distance from Ref. Point ( arcsec ) |
Direction from Ref. Point |
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A. | 11 h 49 m 03.6 s | + 14 ° 34 ′ 19 ″ | 2.2 | |||
B. | 11 h 49 m 06.4 s | + 14 ° 35 ′ 10 ″ | 15.7 | A. | 39.7 | 346 ° |
C. | 11 h 49 m 06.3 s | + 14 ° 35 ′ 50 ″ | 13.2 | A. | 80.3 | 358 ° |
D. | 11 h 48 m 59.1 s | + 14 ° 30 ′ 27 ″ | 8.5 | A. | 264.0 | 203 ° |
See also
Web links
Individual evidence
- ↑ a b c d Hipparcos catalog (ESA 1997)
- ↑ a b bet Leo. In: VSX. AAVSO, accessed September 29, 2018 .
- ↑ a b c Bright Star Catalog
- ↑ Pulkovo radial velocities for 35493 HIP stars
- ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
- ^ Di Folco, E .; Thévenin, F .; Kervella, P .; Domiciano de Souza, A .; Coudé du Foresto, V .; Ségransan, D .; Morel, P .: VLTI near-IR interferometric observations of Vega-like stars . In: Astronomy and Astrophysics . 426, 2004, pp. 601-617. bibcode : 1998RPPh ... 61 ... 77K . doi : 10.1051 / 0004-6361: 20047189 .
- ↑ Akeson et al .: Dust in the inner regions of debris disks around A stars . In: Astrophysical Journal . 691, 2009, pp. 601-617. bibcode : 2009ApJ ... 691.1896A . doi : 10.1088 / 0004-637X / 691/2/1896 .
- ↑ Bulletin of the IAU Working Group on Star Names, No. 1, July 2016. (PDF) Retrieved November 9, 2016 (English, 184 KiB).
- ↑ CCDM (Catalog of Components of Double and multiple stars (Dommanget + 2002)) online query of Vizierdatenbank