IC 4406 (The Retina Nebula) is a planetary nebula in the constellation Wolf , which is located at a distance of about 5218.5 light years from Earth. [1] This is a well-studied bipolar nebula of the southern sky. It is quite large (100 ″ × 30 ″) and convenient for study. IC 4406 was photographed by a large number of telescopes of different wavelengths, including using the AOF (The Adaptive Optics Facility) adaptive optics system on the Very Large Telescope . [2] Photographs in the near infrared range showed two fractions of molecular hydrogen that are orthogonal to the main axis of the nebula and are located at a distance of about 25 ″ from each other. They approximately coincide with two spherical structures, which indicates the possible presence of a dense torus consisting of dust.
| IC 4406 | |
|---|---|
| planetary nebula | |
 | |
| Research history | |
| Discoverer | Delail Stewart |
| opening date | 1899 |
| Designations | PK 319 + 15.1, ESO 272-PN6, AM 1419-435, CS = 14.7 |
| Observational data ( Age J2000.0 ) | |
| Right ascension | |
| Declination | |
| Distance | 5218 St. years (1600 pc ) [1] |
| Visible magnitude (V) | 10,2 m |
| Photographic magnitude (V) | 10.6 |
| Visible Dimensions (V) | 1.77 '× 1.77' |
| Constellation | Wolf |
| physical characteristics | |
| Radius | 0.13 × 0.45 St. of the year |
| Absolute magnitude (V) | -0.3 |
Visible images show a centrally ionized region with a diameter of approximately 32 ''. CO cards show the presence of high-speed collimated outflow in the polar direction. The total mass of molecular gas in the nebula is estimated at 0.16–3.2 solar masses . The images of the Hubble Space Telescope showed a curious structure of dark lines, which gave rise to the appearance of the nebula's own name - Retina ( lat. Retina ).
As for the chemical composition of the nebula, it is quite homogeneous. IC 4406 has a relatively low electron density. The central star of the nebula has an extremely high surface temperature of about 96800 Kelvin (for comparison: the effective surface temperature of the Sun is 5778 Kelvin). The luminosity of a star is estimated at approximately 400 luminosities of the Sun.
Notes
- ↑ 1 2 L. Cerrigone et al. IC 4406: a radio-infrared view . Arxiv.org (Apr 15, 2008). Date of appeal September 26, 2017.
- ↑ First observations with the latest adaptive optics system . ESA Press Release (August 2, 2017). Date of appeal September 26, 2017.
Literature
- L. Cerrigone, JL Hora, G. Umana, C. Trigilio. IC 4406: a radio-infrared view. - 2007 .-- DOI : 10.1086 / 589228 . - arXiv : 0710.2135 .
- Corradi, RLM; Perinotto, M .; Schwarz, HE; Claeskens, J.-F. The chemical structure of bipolar planetary nebulae. I. IC 4406 // Astronomy and Astrophysics. - P. 975-981.
Links
- IC 4406 in the original new general catalog (English) (inaccessible link) . Archived on May 24, 2004.
- IC 4406 in the original new general catalog (French) (inaccessible link) . Archived March 14, 2007.
- Checked information about IC 4406 (English) (inaccessible link - history ) .
- IC 4406 in the SIMBAD database
- IC 4406 at Vizier Base
- IC 4406 at NASA Extragalactic Database
- Databases about NGC / IC objects (English) (inaccessible link) . Date of treatment March 29, 2012. Archived February 2, 2007.