V421 Гидры

V421 Гидры
Звезда
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Наблюдательные данные
(Эпоха J2000.0)
Прямое восхождение 13ч 05м 40,17с[1]
Склонение −25° 41′ 5,83″[1]
Расстояние 18,5704 ± 0,2451 пк[1]
Созвездие Гидра
Астрометрия
Лучевая скорость (Rv) 6,37 ± 0,35 км/с[2]
Собственное движение
 • прямое восхождение −313,481 ± 1,166 mas/год[1]
 • склонение −20,029 ± 0,825 mas/год[1]
Параллакс (π) 53,8492 ± 0,7107 mas[1]
Спектральные характеристики
Спектральный класс L2:+L4:[3]
Физические характеристики
Температура 2100 К[2]
Вращение 68,88 ± 2,6 км/с[2]
Коды в каталогах

2MASS J13054019-2541059, V421 Hya, WDS J13057-2541AB, DENIS J130540.2-254105, CE 298, Gaia DR2 6187779556809793024, LIM 1, 2MASSI J1305401-254106, 2MUCD 11122, Kelu-1, TIC 229255770, USNO-B1.0 0643-00289873, WISEA J130539.92-254106.2, WISEP J130539.94-254106.1, WISE J130539.93-254106.1, [B2006] J130540.1-254110 и Gaia DR3 6187779556809793024

Информация в базах данных
SIMBAD NAME Kelu-1
Логотип Викиданных Информация в Викиданных ?
Логотип Викисклада Медиафайлы на Викискладе

V421 Гидры (лат. V421 Hydrae) — двойная звезда в созвездии Гидры на расстоянии приблизительно 60 световых лет (около 18,6 парсек) от Солнца.

Открыта Марией Тересой Руис и др. в 1997 году[4]*[5]*[6]*. Название Келу-1 (Кейлу-1, Kelu-1) происходит из языка мапуче и означает «красный».

Характеристики

Первый компонент (WDS J13057-2541A) — коричневый карлик, переменная звезда[7] спектрального класса L2[8][9][10]. Звёздная величина диапазона Ic звезды — от +16,96m до +16,94m[8]. Масса — около 0,06 солнечной. Эффективная температура — около 2000 K[4].

Второй компонент (WDS J13057-2541B) — коричневый карлик спектрального класса L3,5[11][12][13], или L4. Видимая звёздная величина звезды — +22,5[14]. Масса — около 0,055 солнечной. Эффективная температура — около 1800 K[4]. Орбитальный период — около 9120 суток (24,98 года)[3]. Удалён на 0,4 угловой секунды[14] (в среднем около 4,75 а.е.[3]).

Примечания

  1. ↑ 1 2 3 4 5 6 Gaia Data Release 2 (англ.) / Data Processing and Analysis Consortium, European Space Agency — 2018.
  2. ↑ 1 2 3 Blake C. H., Charbonneau D., White R. J. The NIRSPEC ultracool dwarf radial velocity survey (англ.) // The Astrophysical Journal / E. Vishniac — IOP Publishing, 2010. — Vol. 723, Iss. 1. — P. 684–706. — ISSN 0004-637X; 1538-4357 — doi:10.1088/0004-637X/723/1/684 — arXiv:1008.3874
  3. ↑ 1 2 3 Dupuy T. J., Liu M. C. Individual Dynamical Masses of Ultracool Dwarfs (англ.) // The Astrophysical Journal: Supplement Series — AAS, 2017. — Vol. 231, Iss. 2. — P. 15. — 47 p. — ISSN 0067-0049; 1538-4365 — doi:10.3847/1538-4365/AA5E4C — arXiv:1703.05775
  4. ↑ 1 2 3 Audard M., Osten R. A., Brown A., Briggs K. R., Güdel M., Hodges-Kluck E., Gizis J. E. A Chandra X-ray detection of the L dwarf binary Kelu-1. Simultaneous Chandra and Very Large Array observations (англ.) // Astronomy and Astrophysics / T. Forveille — EDP Sciences, 2007. — Vol. 471, Iss. 3. — P. 63–66. — ISSN 0004-6361; 0365-0138; 1432-0746; 1286-4846 — doi:10.1051/0004-6361:20078093 — arXiv:0707.1882
  5. ↑ Gelino C. R., Kulkarni S. R., Stephens D. C. Evidence of Orbital Motion in the Binary Brown Dwarf Kelu‐1AB (англ.) // Publications of the Astronomical Society of the Pacific — University of Chicago Press, 2006. — Vol. 118, Iss. 842. — P. 611–616. — ISSN 0004-6280; 1538-3873 — doi:10.1086/502985 — arXiv:astro-ph/0508164
  6. ↑ Ruiz M. T., Leggett S. K., Allard F. Kelu-1 : A Free-floating Brown Dwarf in the Solar Neighborhood (англ.) // The Astrophysical Journal / E. Vishniac — IOP Publishing, 1997. — Vol. 491, Iss. 2. — P. 107–110. — ISSN 0004-637X; 1538-4357 — doi:10.1086/311070
  7. ↑ Kazarovets E. V., Samus N. N., Durlevich O. V., Kireeva N. N., Pastukhova. E. N. The 78th name-list of variable stars (англ.) // Information Bulletin on Variable Stars — Konkoly Observatory, 2006. — Vol. 5721. — P. 1–45. — ISSN 0374-0676; 1587-2440; 1587-6578
  8. ↑ 1 2 V421 Hya, database entry, Combined General Catalog of Variable Stars (GCVS5.1, 2017 Ed.), N. N. Samus, O. V. Durlevich, et al., CDS ID II/250 Accessed online 2024-02-26.
  9. ↑ Suárez G., Metchev S. Ultracool dwarfs observed with the Spitzer infrared spectrograph - II. Emergence and sedimentation of silicate clouds in L dwarfs, and analysis of the full M5-T9 field dwarf spectroscopic sample (англ.) // Monthly Notices of the Royal Astronomical Society / D. Flower — OUP, 2022. — Vol. 513, Iss. 4. — P. 5701—5726. — ISSN 0035-8711; 1365-2966 — doi:10.1093/MNRAS/STAC1205 — arXiv:2205.00168
  10. ↑ Tannock M. E., Metchev S., Heinze A., Miles-Páez P. A., Gagné J., Burgasser A., Marley M. S., Apai D., Suárez G., Plavchan P. Weather on Other Worlds. V. The Three Most Rapidly Rotating Ultra-cool Dwarfs (англ.) // The Astronomical Journal / J. G. III, E. Vishniac — New York City: IOP Publishing, AAS, University of Chicago Press, AIP, 2021. — Vol. 161, Iss. 5. — 21 p. — ISSN 0004-6256; 1538-3881 — doi:10.3847/1538-3881/ABEB67 — arXiv:2103.01990
  11. ↑ Richey-Yowell T., Kao M. M., Pineda J. S., Shkolnik E. L., Hallinan G. On the Correlation between L Dwarf Optical and Infrared Variability and Radio Aurorae (англ.) // The Astrophysical Journal / E. Vishniac — IOP Publishing, 2020. — Vol. 903, Iss. 1. — 22 p. — ISSN 0004-637X; 1538-4357 — doi:10.3847/1538-4357/ABB826 — arXiv:2009.05590
  12. ↑ Paudel R. R., Gizis J. E., Mullan D. J., Schmidt S. J., Burgasser A. J., Williams, P. K. G. K2 Ultracool Dwarfs Survey - VI. White light superflares observed on an L5 dwarf and flare rates of L dwarfs (англ.) // Monthly Notices of the Royal Astronomical Society / D. Flower — OUP, 2020. — Vol. 494, Iss. 4. — P. 5751—5760. — ISSN 0035-8711; 1365-2966 — doi:10.1093/MNRAS/STAA1137 — arXiv:2004.10579
  13. ↑ Bardalez Gagliuffi, Daniella C., Burgasser A. J., Schmidt S. J., Theissen C., Gagné J., Gillon M., Sahlmann J., Faherty J. K., Gelino C., Cruz K. L. et al. The Ultracool SpeXtroscopic Survey. I. Volume-limited Spectroscopic Sample and Luminosity Function of M7-L5 Ultracool Dwarfs (англ.) // The Astrophysical Journal / E. Vishniac — IOP Publishing, 2019. — Vol. 883, Iss. 2. — P. 35. — ISSN 0004-637X; 1538-4357 — doi:10.3847/1538-4357/AB253D — arXiv:1906.04166
  14. ↑ 1 2 Вашингтонский каталог визуально-двойных звёзд

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