Astronomy:NGC 1514
| Emission nebula | |
|---|---|
| Planetary nebula | |
 | |
| Observation data: J2000 epoch | |
| Right ascension | 04h 09m 16.98573s[1] |
| Declination | +30° 46′ 33.4699″[1] |
| Distance | 1520 ly |
| Apparent magnitude (V) | 9.27 |
| Apparent dimensions (V) | 2.2′[2] |
| Constellation | Taurus |
| Physical characteristics | |
| Radius | 0.5[citation needed] ly |
NGC 1514 is a planetary nebula in the zodiac constellation of Taurus,[2] positioned to the north of the star Psi Tauri along the constellation border with Perseus.[3] Distance to the nebula is 466 pc, according to GAIA DR2 data.[full citation needed]
It was discovered by William Herschel on November 13, 1790, describing it as "a most singular phenomenon" and forcing him to rethink his ideas on the construction of the heavens. Up until this point Herschel was convinced that all nebulae consisted of masses of stars too remote to resolve, but now here was a single star "surrounded with a faintly luminous atmosphere". He concluded: "Our judgement I may venture to say, will be, that the nebulosity about the star is not of a starry nature."[4][5]
This is a double-shell nebula that is described as, "a bright roundish amorphous PN" with a radius of around 65″ and a faint halo that has a radius of 90″.[6] It consists of an outer shell, an inner shell, and bright blobs.[7] The inner shell appears to be distorted, but was likely originally spherical.[8] An alternative description is of "lumpy nebula composed of numerous small bubbles" with a somewhat filamentary structure in the outer shell.[5] Infrared observations show a huge region of dust surrounds the planetary nebula, spanning 8.5 ly (2.6 pc). There is also a pair of rings forming what appears to be a diabolo-like structure, similar to those found in MyCn 18, but these are extremely faint and only visible in the mid-infrared,[8] The combined mass of the gas and dust is estimated at 2.2±1.4 M☉[6] The ionized gas is moderately excited, and the electron temperature is estimated to be 15,000 K.[8]
The nebula originated from a binary star system with the designation HD 281679 from the Henry Draper Catalogue.[9] The bright, visible component is a giant star on the horizontal branch with a stellar classification of A0III, while the nebula-generating companion is now a hot, sub-luminous O-type star.[5] The two were originally thought to have an orbital period on the order of 10 days,[7] but observations of the system over years showed that their orbit is actually one of the longest known for any planetary nebula, with a period of about 9 years.[10] Their orbital eccentricity is about 0.5.[10]
References
- ↑ 1.0 1.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 Finlay, Warren H. (2014), Concise Catalog of Deep-sky Objects, The Patrick Moore Practical Astronomy Series (2nd ed.), Springer Science & Business Media, p. 177, ISBN 978-3-319-03169-9.
- ↑ Sinnott, Roger W.; Perryman, Michael A. C. (1997). Millennium Star Atlas. 1. Sky Publishing Corporation and the European Space Agency. ISBN 0-933346-84-0.
- ↑ "On Nebulous Stars, Properly So Called.", Philosophical Transactions of the Royal Society 81: 71–88, February 10, 1791, doi:10.1098/rstl.1791.0006, Bibcode: 1791RSPT...81...71H.
- ↑ 5.0 5.1 5.2 Ressler, Michael E. et al. (December 2010), "The Discovery of Infrared Rings in the Planetary Nebula NGC 1514 During the WISE All-sky Survey", The Astronomical Journal 140 (6): 1882–1890, doi:10.1088/0004-6256/140/6/1882, Bibcode: 2010AJ....140.1882R.
- ↑ 6.0 6.1 Aryal, B. et al. (February 2010), "A giant dusty bipolar structure around the planetary nebula NGC 1514", Monthly Notices of the Royal Astronomical Society 402 (2): 1307–1312, doi:10.1111/j.1365-2966.2009.15966.x, Bibcode: 2010MNRAS.402.1307A.
- ↑ 7.0 7.1 Muthu, C.; Anandarao, B. G. (December 2003), "A Spatiokinematic Study of the Planetary Nebula NGC 1514", The Astronomical Journal 126 (6): 2963–2970, doi:10.1086/379552, Bibcode: 2003AJ....126.2963M.
- ↑ 8.0 8.1 8.2 Aller, A.; Vázquez, R.; Olguín, L.; Miranda, L. F.; Ressler, M. E. (2021), "The morpho-kinematical structure and chemical abundances of the complex planetary nebula NGC 1514", Monthly Notices of the Royal Astronomical Society 504 (4): 4806–4816, doi:10.1093/mnras/stab1233.
- ↑ "NGC 1514". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+1514.
- ↑ 10.0 10.1 Jones, D.; Van Winckel, H.; Aller, A.; Exter, K.; De Marco, O. (2017). "The long-period binary central stars of the planetary nebulae NGC 1514 and LoTr 5". Astronomy & Astrophysics 600: L9. doi:10.1051/0004-6361/201730700. Bibcode: 2017A&A...600L...9J.
External links
Coordinates: 
04h 09m 16.984s, +30° 46′ 33.47″
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