astro.wikisort.org - Nebula
Fleming 1 is an unusual planetary nebula situated in the Centaurus constellation. It has a pair of symmetrical jets spanning more than 2.8 pc and delineated with a number of knots. The jets and knots are moving away from the center of the nebula and were probably ejected 10,000 to 16,000 years ago.[2] The innermost part of the nebula has a butterfly shape and is immersed into a faint halo. The butterfly's wings point in the direction of jets with their axis titled by 50° to the line of sight. The waist of the "butterfly" is surrounded by a torus of expanding hot gas forming the inner bright ellipse.[3] Fleming 1 is probably 5,000 years old.[2]
| Emission nebula | |
|---|---|
| Planetary nebula | |
 Fleming 1 as seen by ESO | |
| Observation data: J2000 epoch | |
| Right ascension | 11h 28m 36.20s[1] |
| Declination | −52° 56′ 04.50″[1] |
| Distance | 2,400 pc ly |
| Apparent magnitude (V) | +7.6[1] |
| Apparent dimensions (V) | 1.3′ × 0.5′ (central part) |
| Constellation | Centaurus |
| Physical characteristics | |
| Radius | 1.4 pc ly |
| Absolute magnitude (V) | 13.1[1] |
| Notable features | A peculiar PN with a binary in the center |
| Designations | G290.5+07.9, ESO 170-6[1] |
Like any other planetary nebula Fleming 1 was formed when an old asymptotic giant branch (AGB) star lost its outer hydrogen-rich envelope, leaving behind a hot core (young white dwarf)—the central star of the nebula. The star in the center of Fleming 1 has a temperature of 80,000 ± 15,000 K and mass of 0.56+0.3
−0.04 M☉.[2]
Observations performed by European Southern Observatory showed that the central star is in fact a double degenerate (made of two white dwarfs) binary with a period of 1.1953 ± 0.0002 days. The companion is probably an older white dwarf of a higher mass—0.64 to 0.7 M☉. Its temperature is about 120,000 K providing the bulk of high energy photons needed to ionize the nebula. The jets likely formed as a result of accretion of the material from the AGB star onto this white dwarf. The accretion led to the formation of a precessing accretion disk, which was expelling material along its rotational axis leading to the formation of jets and knots. The past accretion events also explain the high temperature of the second white dwarf.[2]
References
- "PN Fg 1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-11-26.
- Boffin, H. M. J.; Miszalski, B.; Rauch, T.; Jones, D.; Corradi, R. L. M.; Napiwotzki, R.; Day-Jones, A. C.; Koppen, J. (2012). "An Interacting Binary System Powers Precessing Outflows of an Evolved Star". Science. 338 (6108): 773–775. arXiv:1211.2200. Bibcode:2012Sci...338..773B. doi:10.1126/science.1225386. PMID 23139326.
- Palmer, J.W.; Lopez, J.A.; Meaburn, J.; Lloyd, H.M. (1996). "The kinematics and morphology of the planetary nebula Fleming 1. Bullets, jets and an expanding ring". Astronomy and Astrophysics. 307: 225–236. Bibcode:1996A&A...307..225P.
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На других языках
[de] Fleming 1
Fleming 1 ist ein planetarischer Nebel im Sternbild Zentaur am Südsternhimmel, der rund 10.000 Lichtjahre von der Sonne entfernt ist. Auffallend sind seine zwei gekrümmten Jets, eng gebündelte Ströme aus Gas, die vom Zentrum des Nebels ausgehen. Außerdem entdeckte man in seinem Zentrum zwei Weiße Zwerge, die sich gegenseitig alle 1,2 Tage umkreisen.- [en] Fleming 1
[ru] Флеминг 1
Флеминг 1 (англ. Fleming 1) — необычная планетарная туманность, находящаяся в созвездии Центавра. Обладает парой джетов, простирающихся более чем на 2,8 пк и имеющих узловатую структуру. Джеты и узлы движутся от центра туманности и, вероятно, были испущены туманностью в период 10—16 тыс. лет назад.[2] Внутренняя часть туманности имеет форму бабочки и погружена в слабое гало. Крылья бабочки указывают в направлении джетов, ось которых составляет угол 50° с лучом зрения. Область перегиба бабочки окружена тором из расширяющегося горячего газа, создающего внутренний яркий эллипс.[3] Возраст туманности оценивается в 5000 лет.[2]Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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