Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Lyra |
Right ascension | 18h 32m 49.95782s[1] |
Declination | +30° 33′ 15.14853″[1] |
Apparent magnitude (V) | 5.47[2] + 12.7[3] |
Characteristics | |
Spectral type | B8IV[4] or B8V[5] |
U−B color index | −0.463[2] |
B−V color index | −0.077±0.003[2] |
Astrometry | |
Radial velocity (Rv) | −10.3±1.5[6] km/s |
Proper motion (μ) | RA: 13.229[1] mas/yr Dec.: 11.581[1] mas/yr |
Parallax (π) | 9.3894 ± 0.1103 mas[1] |
Distance | 347 ± 4 ly (107 ± 1 pc) |
Absolute magnitude (MV) | 0.27[2] |
Details | |
A | |
Mass | 3.12±0.03[7] M☉ |
Radius | 2.7±0.1[8] R☉ |
Luminosity | 123.8+7.7 −7.1[7] L☉ |
Temperature | 11,695±81[7] K |
Metallicity [Fe/H] | +0.08±0.07[9] dex |
Rotational velocity (v sin i) | 36±2[5] km/s |
Other designations | |
Database references | |
SIMBAD | data |
HD 171301 is a suspected binary star[11] system in the northern constellation of Lyra. It has not been well-studied.[5] The brighter member of the pair, designated component A,[3] has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of 5.47.[2] The system is located at a distance of approximately 347 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −10 km/s.[6]
The stellar classification of HD 171301 is B8IV,[4] matching a late B-type star that may be a subgiant that is evolving off the main sequence. HD 171301 appears to be a type of chemically peculiar mercury-manganese star.[5] It has an estimated mass three[7] times that of the Sun and 2.7 times the Sun's radius.[8] The star is spinning with a projected rotational velocity of 36 km/s.[5] It is radiating 124[7] times the luminosity of the Sun from its photosphere at an effective temperature of 11,695 K.[7]
Its companion, component B, is a 13th magnitude star of an unknown spectral type.[12] It was first reported by S. W. Burnham in 1891. As of 1998, it was located at an angular separation of 6.7 arcseconds from the brighter star along a position angle of 157°.[3]
References
[edit]- ^ a b c d e 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. Gaia DR2 record for this source at VizieR.
- ^ a b c d e Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- ^ a b c Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
- ^ a b Osawa, Kiyoteru (1959), "Spectral Classification of 533 B8-A2 Stars and the Mean Absolute Magnitude of A0 V Stars", Astrophysical Journal, 130: 159, Bibcode:1959ApJ...130..159O, doi:10.1086/146706
- ^ a b c d e Adelman, S. J.; et al. (June 2017). "Elemental abundance analyses with DAO spectrograms: XL". Astronomische Nachrichten. 338 (5): 584–597. Bibcode:2017AN....338..584A. doi:10.1002/asna.201613214.
- ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
- ^ a b c d e f Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. S2CID 55586789.
- ^ a b Kervella, Pierre; et al. (March 2019). "Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly". Astronomy & Astrophysics. 623: 23. arXiv:1811.08902. Bibcode:2019A&A...623A..72K. doi:10.1051/0004-6361/201834371. S2CID 119491061. A72.
- ^ Gáspár, András; et al. (2016). "The Correlation between Metallicity and Debris Disk Mass". The Astrophysical Journal. 826 (2): 171. arXiv:1604.07403. Bibcode:2016ApJ...826..171G. doi:10.3847/0004-637x/826/2/171. S2CID 119241004.
- ^ "HD 171301". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 16, 2007.
- ^ 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.
- ^ "CCDM J18328+3033B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 16, 2007.
External links
[edit]- http://alcyone.de/cgi-bin/search.pl?object=HR6968 Archived 2007-06-21 at the Wayback Machine
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