Back Wei (estrella) AST Epsilon Scorpii German Wei (estrella) Spanish اپسیلون کژدم Persian Epsilon Scorpii French אפסילון בעקרב HE ऍप्सिलन स्कोर्पाए तारा Hindi Epsilon Scorpii ID Epsilon Scorpii Italian さそり座イプシロン星 Japanese

Epsilon Scorpii

ε Scorpii
Location of ε Sco (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension 16h 50m 09.8s[1]
Declination –34° 17′ 36″[1]
Apparent magnitude (V) +2.310[2] (2.24 - 2.35)[3])
Characteristics
Spectral type K1 III[4]
U−B color index +1.147[2]
B−V color index +1.150[2]
Variable type suspected[3]
Astrometry
Radial velocity (Rv)–2.5[5] km/s
Proper motion (μ) RA: –614.85[1] mas/yr
Dec.: –255.98[1] mas/yr
Parallax (π)51.19 ± 0.22 mas[1]
Distance63.7 ± 0.3 ly
(19.54 ± 0.08 pc)[1]
Absolute magnitude (MV)0.78 ± 0.04[6]
Details[7]
Mass1.4±0.1 M☉
Radius15.5±0.5 R☉
Luminosity53.7±0.6 L☉
Surface gravity (log g)2.1±0.07 cgs
Temperature4583±125 K
Metallicity [Fe/H]–0.17 dex
Rotational velocity (v sin i)2.6 ± 0.5[8] km/s
Age3.92[9] Gyr
Other designations
Wei, Larawag, 26 Scorpii, CD–34 11285, FK5 628, GCTP 3823.00, Gl 639.1, HD 151680, HIP 82396, HR 6241, LHS 3244, SAO 208078.[10]
Database references
SIMBADdata

Epsilon Scorpii (ε Scorpii, abbreviated Eps Sco, ε Sco), formally named Larawag /ˈlærəwæɡ/,[11] is a star in the southern zodiac constellation of Scorpius. It has an apparent visual magnitude of +2.3,[2] making it the fifth-brightest member of the constellation. Parallax measurements made during the Hipparcos mission provide an estimated distance to this star of around 63.7 light-years (19.5 parsecs) from the Sun.[1]

Epsilon Scorpii has a stellar classification of K1 III,[4] which indicates it has exhausted the supply of hydrogen at its core and evolved into a giant star. Currently, it has expanded to 15.5 times the Sun's size and is emitting 54 times its luminosity.[7] Presently it is generating energy through the nuclear fusion of helium at its core, which, considering the star's composition, places it along an evolutionary branch termed the red clump.[12] The star's outer atmosphere has an effective temperature of 4,580 K,[7] giving it the orange hue of a cool K-type star.

ε Scorpii is classified as a suspected variable star,[3] although a study of Hipparcos photometry showed a variation of no more than 0.01–0.02 magnitudes.[12] It is an X-ray source with a luminosity of (1.5–1.6) × 1027 erg s−1.[6][13]

  1. ^ a b c d e f g Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference apjs15_459 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference gcvs was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference aj132_1_161 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference scfs was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference aaa335_591 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference kallinger was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference aj135_3_892 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.
  12. ^ a b Cite error: The named reference ba10_593 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference aaa352_217 was invoked but never defined (see the help page).

Rich TVX News Network Site

Rich TVX News Network Info

© MMXXIII Rich X Search. We shall prevail. All rights reserved. Rich X Search