Kappa Lyrae
This article will address the topic of Kappa Lyrae, which has acquired increasing relevance in recent years. Kappa Lyrae is a topic that has aroused the interest of researchers, experts and the general public, due to its impact on different areas of society. Since its emergence, Kappa Lyrae has generated debates, analyzes and reflections around its implications, consequences and possible solutions. This article will seek to offer a comprehensive view of Kappa Lyrae, exploring its origins, evolution, current challenges and future perspectives. It is important to understand the importance of Kappa Lyrae today, as its influence extends to fields as diverse as technology, politics, culture, economics and the environment.
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 19m 51.70908s[1] |
| Declination | +36° 03′ 52.3691″[1] |
| Apparent magnitude (V) | 4.33[2] |
| Characteristics | |
| Evolutionary stage | giant |
| Spectral type | K2-IIIabCN0.5[3] |
| U−B color index | +1.17[4] |
| B−V color index | +1.162±0.013[2] |
| Variable type | suspected[5] |
| Astrometry | |
| Radial velocity (Rv) | −24.36±0.13[6] km/s |
| Proper motion (μ) | RA: −16.75[1] mas/yr Dec.: +41.09[1] mas/yr |
| Parallax (π) | 12.96±0.14 mas[1] |
| Distance | 252 ± 3 ly (77.2 ± 0.8 pc) |
| Absolute magnitude (MV) | −0.11[2] |
| Details | |
| Radius | 18[6] R☉ |
| Luminosity | 127.4[7] L☉ |
| Surface gravity (log g) | 2.51[8] cgs |
| Temperature | 4,638[8] K |
| Metallicity | +0.13[8] dex |
| Rotational velocity (v sin i) | 5.0[6] km/s |
| Other designations | |
| κ Lyr, 1 Lyrae, BD+36°3094, HD 168775, HIP 89826, HR 6872, SAO 66869[9] | |
| Database references | |
| SIMBAD | data |
κ Lyrae, Latinized as Kappa Lyrae, is a solitary[10] star in the northern constellation of Lyra, near the constellation border with Hercules. It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.33.[2] This object is located approximately 252 light years from the Sun based on parallax,[1] but is moving closer with a radial velocity of −24 km/s.[6]
This is an aging giant star with a stellar classification of K2-IIIabCN0.5,[3] with the suffix notation indicating a mild underabundance of cyanogen. Having exhausted the supply of hydrogen at its core, the star has cooled and expanded. It now has 18[6] times the Sun's girth and is radiating 127[7] times the luminosity of the Sun at an effective temperature of 4,638 K.[8] κ Lyrae is a red clump giant, which means it is on the horizontal branch and is generating energy through core helium fusion.[11] It is a suspected small amplitude variable star.[5]
References
- ^ a b c d e f 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 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 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
- ^ Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M.
- ^ a b Percy, J. R.; et al. (1994), "Photometric surveys of suspected small-amplitude red variables. III: An AAVSO photometric photometry survey", Astronomical Society of the Pacific, 106 (700): 611–615, Bibcode:1994PASP..106..611P, doi:10.1086/133420.
- ^ a b c d e Massarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397.
- ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ a b c d Maldonado, J.; et al. (June 2013), "The metallicity signature of evolved stars with planets", Astronomy & Astrophysics, 554: 18, arXiv:1303.3418, Bibcode:2013A&A...554A..84M, doi:10.1051/0004-6361/201321082, S2CID 119289111, A84.
- ^ "kap Lyr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 14, 2007.
- ^ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv:astro-ph/0003329, Bibcode:2000ApJ...539..732A, doi:10.1086/309278, S2CID 16673121.