Gliese 402

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Gliese 402
EELeoLightCurve.png
A visual band light curve for EE Leonis, adapted from Weis (1994) [1]
Observation data
Epoch J2000        Equinox J2000
Constellation Leo
Right ascension 10h 50m 52.03129s [2]
Declination +06° 48′ 29.2278″ [2]
Apparent magnitude  (V)11.64 - 11.70 [3]
Characteristics
Spectral type M4.0V [4]
U−B color index +1.16 [5]
B−V color index +1.66 [5]
V−R color index +1.24 [5]
R−I color index +1.57 [5]
Variable type BY Dra [3]
Astrometry
Radial velocity (Rv)-1.04 [6]  km/s
Proper motion (μ)RA: −856.185 [7]   mas/yr
Dec.: −818.607 [7]   mas/yr
Parallax (π)143.5391 ± 0.0286  mas [8]
Distance 22.722 ± 0.005  ly
(6.967 ± 0.001  pc)
Absolute magnitude  (MV)12.47 [5]
Details
Mass 0.255 ± 0.014 [9]   M☉
Radius 0.3 [10]   R☉
Surface gravity (log g)4.5 [11]   cgs
Temperature 3100 [11]   K
Metallicity [Fe/H]-0.06 [9]   dex
Other designations
EE  Leo, HIP  53020, Gliese  402, LTT  12891, LHS  294, Wolf  358
Database references
SIMBAD data
ARICNS data

Gliese 402 is a star located 22.7 light years from the Solar System. Located in the constellation of Leo, it is also known as Wolf 358 from its entry in Max Wolf's star catalogue. The stars nearest to Gliese 402 are Gliese 393, at 3.43 light years, Gliese 408, at 6.26 light years, and Gliese 382 at 6.66 light years. [12]

Gliese 402 is a BY Draconis variable, with its apparent magnitude varying between 11.64 and 11.70. The brightness changes are due to starspots and chromospheric activity combined with the rotation of the star. It has been given the variable star designation EE Leonis. [3]

Like the vast majority of stars in the Solar neighborhood, Gliese 402 is a dim red dwarf. With an apparent magnitude +11.66, it is far too dim to be seen with the naked eye; it can only be seen with a telescope. Its luminosity is only 0.091% that of the Sun. [12] Its spectral type is M4V (sometimes cited as M5V[ citation needed ]) and its effective temperature is about 3100 K. Its physical characteristics are quite similar to those of Ross 128 or Kruger 60 B, with a radius of about 30% of the Sun. [10] Its projected rotation speed is at most 2.3 km/s or less, [9] while its metallicity is slightly lower than that of the Sun. [9]

See also

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References

  1. ↑ Weis, Edward W. (March 1994). "Long Term Variability in Dwarf M Stars". The Astronomical Journal. 107 (3): 1135–1140. Bibcode:1994AJ....107.1135W. doi:10.1086/116925. Archived from the original on 1 March 2022. Retrieved 19 January 2022.
  2. 1 2 van Leeuwen, F.; et al. (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. S2CID   18759600. Archived from the original on 2019-12-07. Retrieved 2017-01-28.
  3. 1 2 3 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  4. ↑ Alonso-Floriano, F. J.; Morales, J. C.; Caballero, J. A.; Montes, D.; Klutsch, A.; Mundt, R.; Cortés-Contreras, M.; Ribas, I.; Reiners, Ansgar; Amado, P. J.; Quirrenbach, A.; Jeffers, S. V. (2015). "CARMENES input catalogue of M dwarfs" (PDF). Astronomy & Astrophysics. 577: A128. arXiv: 1502.07580 . Bibcode:2015A&A...577A.128A. doi:10.1051/0004-6361/201525803. S2CID   53135130.[ permanent dead link ]
  5. 1 2 3 4 5 "ARICNS 4C00824". ARICNS. Archived from the original on 31 August 2021. Retrieved 23 January 2017.
  6. ↑ Nidever, David L.; et al. (2013). "Radial Velocities for 889 Late-Type Stars". The Astrophysical Journal Supplement Series. 141 (2): 503–522. arXiv: astro-ph/0112477 . Bibcode:2002ApJS..141..503N. doi:10.1086/340570. S2CID   51814894.
  7. 1 2 Brown, A. G. A; Vallenari, A; Prusti, T; De Bruijne, J. H.J; Mignard, F; Drimmel, R; Babusiaux, C; Bailer-Jones, C. A.L; Bastian, U; Biermann, M; Evans, D. W; Eyer, L; Jansen, F; Jordi, C; Katz, D; Klioner, S. A; Lammers, U; Lindegren, L; Luri, X; o'Mullane, W; Panem, C; Pourbaix, D; Randich, S; Sartoretti, P; Siddiqui, H. I; Soubiran, C; Valette, V; Van Leeuwen, F; Walton, N. A; et al. (2016). "Gaia Data Release 1". Astronomy & Astrophysics. 595: A2. arXiv: 1609.04172 . Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. S2CID   1828208.
  8. ↑ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics . 649: A1. arXiv: 2012.01533 . Bibcode:2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657 . S2CID   227254300. (Erratum:  doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  9. 1 2 3 4 Jenkins, J. S.; Ramsey, L. W.; Jones, H. R. A.; Pavlenko, Y.; Gallardo, J.; Barnes, J. R.; Pinfield, D. J. (2009). "Rotational Velocities for M Dwarfs". The Astrophysical Journal . 704 (2): 975–988. arXiv: 0908.4092 . Bibcode:2009ApJ...704..975J. doi:10.1088/0004-637X/704/2/975. S2CID   119203469.
  10. 1 2 Pasinetti Fracassini, L. E.; et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy & Astrophysics. 367 (2): 521–24. arXiv: astro-ph/0012289 . Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID   425754.
  11. 1 2 Lépine, Sébastien; et al. (2013). "A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky". The Astronomical Journal. 145 (4): 102. arXiv: 1206.5991 . Bibcode:2013AJ....145..102L. doi:10.1088/0004-6256/145/4/102. S2CID   117144290.
  12. 1 2 "Stars within 15 light-years of Wolf 358". The Internet Stellar Database.
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