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 |
| Jarak | 16,0 ± 0,2 tc (4,90 ± 0,07 pc) |
| Magnitudo mutlak (MV) | 10.87[7] |
| Detail | |
| Massa | 0.39–0.42[7][8] M☉ |
| Radius | 0.39[8] R☉ |
| Luminositas | 0.024[9] L☉ |
| Gravitasi permukaan (log g) | 4.79[9] |
| Suhu | 3,390 ± 19[10] K |
| Metalisitas [Fe/H] | +0.28 ± 0.17[10] |
| Kecepatan rotasi (v sin i) | 3[8][11] km/s |
| Usia | 25-300[12] megatahun |
| Penamaan lain | |
| Referensi basis data | |
| SIMBAD | data |
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
[sunting | sunting sumber]Referensi
[sunting | sunting sumber]- ^ 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.
- ^ 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.
- ^ 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
. Bibcode:2009ApJ...699..649S. doi:10.1088/0004-637X/699/1/649.
- ^ 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.
- ^ 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.
- ^ Gliese, W.; Jahreiß, H. (1991). "Gl 388". Preliminary Version of the Third Catalogue of Nearby Stars. Diakses tanggal 2014-11-22.
- ^ a b "The One Hundred Nearest Star Systems". Georgia State University. 1 January 2009. Diakses tanggal 2009-09-25.
- ^ 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 . Bibcode:2009ApJ...692..538R. doi:10.1088/0004-637X/692/1/538.
- ^ 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.
- ^ 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 . Bibcode:2012ApJ...748...93R. doi:10.1088/0004-637X/748/2/93.
- ^ 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 . Bibcode:2007A&A...467..259R. doi:10.1051/0004-6361:20066991.
- ^ 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 . Bibcode:2009ApJ...699..649S. doi:10.1088/0004-637X/699/1/649.
- ^ "V* AD Leo – Flare Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Diakses tanggal 2009-09-25.
- ^ 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.
- ^ 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.
- ^ 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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