LoTr 1
| Emission nebula | |
|---|---|
| Planetary nebula | |
| Observation data: J2000 epoch | |
| Right ascension | 05h 55m 06.6s[1] |
| Declination | −22° 54′ 02″[1] |
| Distance | 5,875[2] ly |
| Apparent diameter | 2' 26" ± 4"[3] |
| Constellation | Lepus |
| Designations | PN DeHt 1, PK 228-22 1, PN G228.2-22.1, V* AB Lep[1] |
LoTr 1 is a bubble-shaped elliptical nebula with a binary central star system.
Nomenclature
[edit]The nebula is commonly known as LoTr 1 or Longmore-Tritton 1. It was discovered in 1980 by astronomers A.J Longmore and S.B. Tritton and was found using the UK 1.2-meter Schmidt telescope.[4]
Characteristics
[edit]LoTr 1 belongs to the 'Abell 35 type' group of PNe.[5] The nebula features a central inner shell with an angular diameter of 47 ± 4" and Outer shell with a more Irregular shape that has a diameter of 4 ± 26".[3]
The Vexp for the inner shell is estimated to be 25 ± 4 km-1 while the outer shell is estimated to be 25 ± 4 km-1.[6]
Binary star AB Leporis
[edit]The primary star was classified to be a K 1 III-type giant[7] with an effective temperature of ~4750±150 K.[8] A barium abundance of 0.5 or greater classifies the system as a definite Ba ii star, with a value of 0.2–0.5 indicates the possibility of being a ‘mild’ Ba ii star.[9] The second companion is a White dwarf star.[3]
References
[edit]- 1 2 3 "V* AB Lep". simbad.cds.unistra.fr.
- ↑ "Longmore Tritton 1 PN in Lepus". chart32.de.
- 1 2 3 Tyndall, A. A.; Jones, D.; Boffin, H. M. J.; Miszalski, B.; Faedi, F.; Lloyd, M.; Boumis, P.; López, J. A.; Martell, S.; Pollacco, D.; Santander-García, M. (December 2013). "Two rings but no fellowship: LoTr 1 and its relation to planetary nebulae possessing barium central stars". Monthly Notices of the Royal Astronomical Society. 436 (3): 2082–2095. arXiv:1309.4307. Bibcode:2013MNRAS.436.2082T. doi:10.1093/mnras/stt1713.
- ↑ Longmore, A. J.; Tritton, S. B. (November 1980). "A second list of new planetary nebulae found on United Kingdom 1.2m Schmidt telescope plates". Monthly Notices of the Royal Astronomical Society. 193 (3): 521–524. Bibcode:1980MNRAS.193..521L. doi:10.1093/mnras/193.3.521.
- ↑ Bond, H. E.; Meakes, M. G.; Ciardullo, R. (August 2017). "The Abell 35-Type Planetary Nuclei". Symposium - IAU. 155: 397. doi:10.1017/S0074180900171864.
- ↑ Weinberger, R. (May 1989). "A catalogue of expansion velocities of galactic planetary nebulae". Astronomy & Astrophysics. 78 (301–324): 301. Bibcode:1989A&AS...78..301W.
- ↑ Bagnulo, S.; Leodux, C.; Jehin, E.; Cabanac, R.; Melo, C.; Gilmozzi, R. (December 2003). "THE UVES PARANAL OBSERVATORY PROJECT A LIBRARY OF HIGH-RESOLUTION SPECTRA OF STARS ACROSS THE HERTZSPRUNG TZSPRUNG-RUSSELL DIAGRAM" (PDF). The ESO Messenger. 114: 10–14.
- ↑ Castelli, F.; Kurucz, R. L. (2003). "New Grids of ATLAS9 Model Atmospheres". Astronomical Society of the Pacific. 210: A20. arXiv:astro-ph/0405087. Bibcode:2003IAUS..210P.A20C.
- ↑ Pilachowski, C. A. (January 1997). "The chemical compositions of the mild barium stars". Astronomy & Astrophysics. 54: 465–474. Bibcode:1977A&A....54..465P.
