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AD Leonis

AD Leonis
Data pengamatan
Epos J2000      Ekuinoks J2000
Rasi bintang Leo
Asensio rekta  10j 19m 36.277d[1]
Deklinasi  +19° 52′ 12.06″[1]
Magnitudo tampak (V) 9.32[2]
Ciri-ciri
Kelas spektrum M3.5eV[3]
Indeks warna U−B +1.06[2]
Indeks warna B−V +1.54[2]
Jenis variabel Flare star[4]
Astrometri
Kecepatan radial (Rv)+10.8[5] km/s
Gerak diri (μ) RA: –501.8[1] mdb/thn
Dek.: –42.8[1] mdb/thn
Paralaks (π)203,9±2,8[6] mdb
Jarak16,0 ± 0,2 tc
(4,90 ± 0,07 pc)
Magnitudo mutlak (MV)10.87[7]
Detail
Massa0.39–0.42[7][8] M☉
Radius0.39[8] R☉
Luminositas0.024[9] L☉
Gravitasi permukaan (log g)4.79[9]
Suhu3,390 ± 19[10] K
Metalisitas [Fe/H]+0.28 ± 0.17[10]
Kecepatan rotasi (v sin i)3[8][11] km/s
Usia25-300[12] megatahun
Penamaan lain
Gliese 388, BD+20 2465, G 54-23, LHS 5167, LTT 12761, NLTT 24015, SAO 81292, PLX 2420, TYC 1423-174-1[13]
Referensi basis data
SIMBADdata

AD Leonis (Gliese 388) adalah bintang katai merah. Jaraknya relatif dekat Matahari, dengan jarak sekitar 16 tahun cahaya, di konstelasi Leo. AD Leonis adalah bintang deret utama dengan klasifikasi spektrum M3.5V.[14] Ini adalah bintang suar yang mengalami peningkatan luminositas secara acak.[15][16]

Lihat pula

Referensi

  1. ^ a b c d Høg, E.; Fabricius, C.; Makarov, V.V.; Urban, S.; Corbin, T.; Wycoff, G.; et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862. 
  2. ^ a b c Nicolet, B. (October 1978). "Catalogue of homogeneous data in the UBV photoelectric photometric system". Astronomy and Astrophysics Supplement Series. 34: 1–49. Bibcode:1978A&AS...34....1N. 
  3. ^ Shkolnik, Evgenya; Liu, Michael C.; Reid, I. Neill (July 2009). "Identifying the young low-mass stars within 25 pc. I. Spectroscopic observations". The Astrophysical Journal. 699 (1): 649–666. arXiv:0904.3323 alt=Dapat diakses gratis. Bibcode:2009ApJ...699..649S. doi:10.1088/0004-637X/699/1/649. 
  4. ^ Kukarkin, B.V.; Kholopov, P.N.; Pskovsky, Y.P.; Efremov, Y.N.; Kukarkina, N.P.; Kurochkin, N.E.; Medvedeva, G.I. (1971). "The third edition, containing information on 20,437 variable stars discovered and designated till 1968". General Catalogue of Variable Stars (edisi ke-3rd). Bibcode:1971GCVS3.C......0K. 
  5. ^ Evans, D.S. (20–24 June 1966). "The revision of the General Catalogue of Radial Velocities". Dalam Batten, Alan Henry; Heard, John Frederick. Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. Bibcode:1967IAUS...30...57E. 
  6. ^ Gliese, W.; Jahreiß, H. (1991). "Gl 388". Preliminary Version of the Third Catalogue of Nearby Stars. Diakses tanggal 2014-11-22. 
  7. ^ a b "The One Hundred Nearest Star Systems". Georgia State University. 1 January 2009. Diakses tanggal 2009-09-25. 
  8. ^ a b c Reiners, A.; Basri, G.; Browning, M. (February 2009). "Evidence for magnetic flux saturation in rapidly rotating M stars". The Astrophysical Journal. 692 (1): 538–545. arXiv:0810.5139 alt=Dapat diakses gratis. Bibcode:2009ApJ...692..538R. doi:10.1088/0004-637X/692/1/538. 
  9. ^ a b Pettersen, B.R.; Coleman, L.A. (December 1981). "Chromospheric lines in red dwarf flare stars, I - AD Leonis and GX Andromedae". Astrophysical Journal. 251 (12): 571–82. Bibcode:1981ApJ...251..571P. doi:10.1086/159500. 
  10. ^ a b Rojas-Ayala, Bárbara; Covey, Kevin R.; Muirhead, Philip S.; Lloyd, James P. (April 2012). "Metallicity and temperature indicators in M dwarf K band spectra: Testing new and updated calibrations with observations of 133 Solar neighborhood M dwarfs". The Astrophysical Journal. 748 (2): 93. arXiv:1112.4567 alt=Dapat diakses gratis. Bibcode:2012ApJ...748...93R. doi:10.1088/0004-637X/748/2/93. 
  11. ^ Reiners, A. (May 2007). "The narrowest M dwarf line profiles and the rotation-activity connection at very slow rotation". Astronomy and Astrophysics. 467 (1): 259–268. arXiv:astro-ph/0702634 alt=Dapat diakses gratis. Bibcode:2007A&A...467..259R. doi:10.1051/0004-6361:20066991. 
  12. ^ Shkolnik, Evgenya; Liu, Michael C.; Reid, I. Neill (July 2009). "Identifying the young low-mass stars within 25 pc. I. Spectroscopic observations". The Astrophysical Journal. 699 (1): 649–666. arXiv:0904.3323 alt=Dapat diakses gratis. Bibcode:2009ApJ...699..649S. doi:10.1088/0004-637X/699/1/649. 
  13. ^ "V* AD Leo – Flare Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Diakses tanggal 2009-09-25. 
  14. ^ Shkolnik, Evgenya; Liu, Michael C.; Reid, I. Neill (2009-06-16). "IDENTIFYING THE YOUNG LOW-MASS STARS WITHIN 25 PC. I. SPECTROSCOPIC OBSERVATIONS". The Astrophysical Journal. 699 (1): 649–666. doi:10.1088/0004-637x/699/1/649. ISSN 0004-637X. 
  15. ^ Kukarkin, B.V.; Kholopov, P.N.; Kireeva, N.N. (1977). "Work on the General Catalogue of Variable Stars". International Astronomical Union Colloquium. 35: 131–133. doi:10.1017/s0252921100052969. ISSN 0252-9211. 
  16. ^ Genova, F.; Bonnarel, F.; Bartlett, J. G.; Dubois, P.; Egret, D.; Jasniewicz, G.; Lesteven, S.; Ochsenbein, F.; Wenger, M. (1997-01-01). "The Centre de Données Astronomiques de Strasbourg". Open Astronomy. 6 (2). doi:10.1515/astro-1997-0206. ISSN 2543-6376. 
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