| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 00h 04m 30.11827s[1] |
| Declination | −10° 30′ 34.2849″[1] |
| Apparent magnitude (V) | 4.953[2] |
| Characteristics | |
| Spectral type | K3 III[3] or K3 Ib[4] |
| B−V color index | +1.66[2] |
| Astrometry | |
| Radial velocity (Rv) | −42.10±0.33[5] km/s |
| Proper motion (μ) | RA: −6.85[1] mas/yr Dec.: −12.02[1] mas/yr |
| Parallax (π) | 1.56 ± 0.31 mas[1] |
| Distance | approx. 2,100 ly (approx. 600 pc) |
| Details | |
| Mass | 9.0±0.6[6] M☉ |
| Luminosity (bolometric) | 10,170[2] L☉ |
| Surface gravity (log g) | 0.90[7] cgs |
| Temperature | 4,152[7] K |
| Metallicity [Fe/H] | 0.08[7] dex |
| Rotational velocity (v sin i) | 5.8±1.0[8] km/s |
| Age | 29.7±3.6[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
3 Ceti is a single,[10] orange-hued star located around 2,100 light years away[11] in the equatorial constellation of Cetus. It is visible to the naked eye with an apparent visual magnitude of 4.95.[2] The star is moving closer to the Earth with a heliocentric radial velocity of −42 km/s.[5] It has a peculiar velocity of 60.7+3.8
−6.2 km/s and is a candidate runaway star.[6]
This is a red supergiant star with a stellar classification of K3 Ib,[4] although Houk and Swift (1999) classed it as a normal giant at K3 III.[3] It displays microvariability, undergoing changes in brightness with a frequency of 11.2 times per day and an amplitude of 0.0053 in magnitude.[4] The star is about 30 million years old with nine times the mass of the Sun.[6] It is radiating 10,170[2] times the Sun's luminosity from its photosphere at an effective temperature of 4,152 K.[7]
It is a possible supernova candidate.[11]
References[edit]
- ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- ^ a b c d e Hohle, M.M.; et al. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. arXiv:1003.2335. Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. S2CID 111387483.
- ^ a b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
- ^ a b c Koen, Chris; Eyer, Laurent (2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331 (1): 45. arXiv:astro-ph/0112194. Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x.
- ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
- ^ a b c d Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873
- ^ a b c d Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147 (6): 137. Bibcode:2014AJ....147..137L. doi:10.1088/0004-6256/147/6/137.
- ^ De Medeiros, J. R.; Udry, S.; Burki, G.; Mayor, M. (2002). "A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars". Astronomy and Astrophysics. 395: 97–98. Bibcode:2002A&A...395...97D. doi:10.1051/0004-6361:20021214.
- ^ "3 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved December 24, 2018.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ a b Asakura, K.; Gando, A.; Gando, Y.; Hachiya, T.; Hayashida, S.; Ikeda, H.; Inoue, K.; Ishidoshiro, K.; Ishikawa, T. (2015-06-03). "KamLAND SENSITIVITY TO NEUTRINOS FROM PRE-SUPERNOVA STARS". The Astrophysical Journal. 818: 91. arXiv:1506.01175v4. doi:10.3847/0004-637X/818/1/91.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction