PROFILPELAJAR.COM

Hubble 5

Hb 5
Emission nebula
Planetary nebula
Image of Hb 5 from the Hubble Space Telescope
Observation data: J2000 epoch
Right ascension17h 47m 56.25s[1]
Declination−29° 59′ 40.07″[1]
Apparent diameter52" x 18"[2]
ConstellationSagittarius
DesignationsPK 359.3-00.1, Hen 2-286, PN G359-3.3-00.9, Sa 2-244, BI 1-E[1]
See also: Lists of nebulae

Hubble 5 (Hb 5) is a rather large bipolar planetary nebula with a complex shape. This nebula was discovered by american astronomer Edwin Hubble in 1921.[3]

Hb 5 has an estimated size of 52" x 18" in Hα.[2] Its distance remains uncertain, with estimates ranging between 0.7 kpc and 2 kpc.[4] The electron temperature of the nebula is 13,000K-16,000K based on the Ne III temperature being low and the Ne V temperature is high. The Hβ flux is ~3.0 x 10-12 erg cm-2 s-1 or 1.19 x 10-10 erg cm-2 s-1.[5] The nebula is a bipolar, point-symmetric PN.[6]

Central Star

The central star is very faint and the presence of the Ne VI line proves that the star is quite hot. The star has a Zanstra temperature ranging from ~100,000 K for hydrogen to ~130,000 K for helium II. Additionally, the star has a radius of about ~0.17 R☉ and a luminosity of 2 x 10⁴ Lʘ.[2]

References

  1. ^ a b c "PN Hb 5". simbad.cds.unistra.fr.
  2. ^ a b c Pottasch, S. R.; Surendiranath, R. (2007). "Abundances in planetary nebulae: Hb 5" (PDF). Astronomy & Astrophysics. 462: 179–192. doi:10.1051/0004-6361:20066012.
  3. ^ Hubble, E. (June 1921). "Twelve New Planetary Nebulae". Publications of the Astronomical Society of Japan. 33 (193): 174. Bibcode:1921PASP...33..174H. doi:10.1086/123070.
  4. ^ Acker, A.; Ochsenbein, F.; Stenholm, B. (1992). "The Strasbourg-ESO Catalogue of Galactic Planetary Nebulae. Parts I, II". European Southern Observatory. Bibcode:1992secg.book.....A.
  5. ^ Odell, C. R. (1963). "Photoelectric Spectrophotometry of Gaseous Nebulae. I. The [S ii] Lines". The Astrophysical Journal. 138: 1018.
  6. ^ Corradi, L. M.; Schwarz, H. E. (1993). "Kinematics of bipolar planetary nebulae". Astronomy & Astrophysics. 278: 247–254.

Content Disclaimer

Informasi ini disarikan dari Wikipedia dan disajikan kembali untuk tujuan edukasi. Konten tersedia di bawah lisensi CC BY-SA 3.0. Kami tidak bertanggung jawab atas ketidakakuratan data yang bersumber dari kontribusi publik tersebut.

  1. The information displayed on this website is sourced in part or in whole from Wikipedia and has been adapted for the purpose of restating it. We strive to provide accurate and relevant information, however:
  2. There is no guarantee of absolute accuracy. Wikipedia is an open, collaborative project that can be edited by anyone, so information is subject to change.
  3. It is not intended to constitute professional advice. The content displayed is for informational and educational purposes only. For important decisions (e.g., medical, legal, or financial), please consult a professional.
  4. Content copyright. Wikipedia is licensed under the Creative Commons Attribution-ShareAlike License (CC BY-SA). This means that content may be reused with appropriate attribution and shared under a similar license.
  5. Responsible use. Any risk arising from the use of information from this website is entirely the responsibility of the user.