26 Camelopardalis
26 Camelopardalis is a single[8] star in the northern constellation of Camelopardalis, positioned next to the southern constellation boundary with Auriga. It is a suspected variable star[9] that is dimly visible to the naked eye with a peak apparent visual magnitude of +5.93.[2] This object is located at a distance of 197 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +21 km/s.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 05h 46m 30.39025s[1] |
| Declination | +56° 06′ 56.0726″[1] |
| Apparent magnitude (V) | +5.93[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A4Vn[4] |
| B−V color index | +0.164±0.004[2] |
| Astrometry | |
| Radial velocity (Rv) | +21.0±4.3[2] km/s |
| Proper motion (μ) | RA: +19.337±0.133[1] mas/yr Dec.: −58.838±0.134[1] mas/yr |
| Parallax (π) | 16.5077 ± 0.0696 mas[1] |
| Distance | 197.6 ± 0.8 ly (60.6 ± 0.3 pc) |
| Absolute magnitude (MV) | 2.01[2] |
| Details | |
| Mass | 1.80±0.02[3] M☉ |
| Luminosity | 12.88+0.75 −0.71[3] L☉ |
| Surface gravity (log g) | 4.12[5] cgs |
| Temperature | 7,798±36[3] K |
| Metallicity [Fe/H] | −0.08[6] dex |
| Rotational velocity (v sin i) | 249[3] km/s |
| Age | 345[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a white-hued A-type main-sequence star with a stellar classification of A4Vn,[4] where the 'n' notation indicates "nebulous" absorption lines due to rapid rotation. It is an estimated 345[5] million years old and is spinning with a projected rotational velocity of 249 km/s.[3] The star has 1.80[3] times the mass of the Sun and is radiating 13 times the Sun's luminosity from its photosphere at an effective temperature of 7,798 K.[3]
References edit
- ^ a b c d e f 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 f 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 d e f g h Zorec, J.; et al. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ a b Cowley, A.; et al. (1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- ^ a b c David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ Netopil, Martin (August 2017), "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system", Monthly Notices of the Royal Astronomical Society, 469 (3): 3042–3055, arXiv:1705.00883, Bibcode:2017MNRAS.469.3042N, doi:10.1093/mnras/stx1077, S2CID 119034918.
- ^ "HD 38091". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-10.
- ^ De Rosa, R. J.; Patience, J.; Wilson, P. A.; Schneider, A.; Wiktorowicz, S. J.; Vigan, A.; Marois, C.; Song, I.; MacIntosh, B.; Graham, J. R.; Doyon, R.; Bessell, M. S.; Thomas, S.; Lai, O. (2014), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society, 437 (2): 1216, arXiv:1311.7141, Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932, S2CID 88503488.
- ^ Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.