HD 51418
  | |
| Observation data Epoch J2000.0[1] Equinox J2000.0[1] | |
|---|---|
| Constellation | Auriga |
| Right ascension | 06h 59m 20.12818s[1] |
| Declination | +42° 18′ 53.1147″[1] |
| Apparent magnitude (V) | 6.67 |
| Characteristics | |
| Spectral type | A0 SrCrEuDy,[2] A0pEuSrCrMgII[3] |
| B−V color index | 0.09 |
| J−H color index | -0.087 |
| J−K color index | -0.037 |
| Astrometry | |
| Radial velocity (Rv) | −22.5±3.0[4] km/s |
| Proper motion (μ) | RA: -1.210[1] mas/yr Dec.: −6.792[1] mas/yr |
| Parallax (π) | 5.6092 ± 0.0929[1] mas |
| Distance | 581 ± 10 ly (178 ± 3 pc) |
| Details | |
| Mass | 3.557±0.178[5] M☉ |
| Radius | 3.297±0.165[5] R☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 51418 (NY Aurigae) is a rapidly oscillating Ap star and an α2 CVn variable located about 178 parsecs (580 ly) away in the northern constellation of Auriga. With an apparent magnitude of 6.67 and a spectral type of A0, it can be faintly visible to the naked eye as a whitish dot under very good circumstances. The star has been noted as an "extreme lanthanide star,"[6] with an overabundance of metals including dysprosium and holmium, which can be observed in the star's spectra.[7]
Properties
HD 51418 also possesses a strong magnetic field, which fluctuates in strength between −22–75 milliteslas (−220–750 G).[8] The magnetic minimum is known to occur concurrently with the minimums in luminosity and rare-earth detection.[7]
Companion stars
Speckle imaging observations conducted in 2009 revealed a previously unresolved companion star at a separation of 0.15 arcseconds. The secondary star, component "B" of the double star WDS 06593+4219 as designated in the Washington Double Star Catalog, is an F-type star with an apparent magnitude of 10.0.[9][10]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "HD 51418". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-09-24.
- ↑ Bychkov, V. D.; Bychkova, L. V.; Madej, J. (2021). "Catalog of averaged magnetic phase curves of stars: Second edition". Astronomy & Astrophysics. 652: A31. doi:10.1051/0004-6361/202040215. ISSN 0004-6361. Record for this source at VizieR.
- ↑ Pyper, Diane M.; Adelman, Saul J. (2021-08-01). "Light Curve Changes and Possible Precession in mCP Stars". Publications of the Astronomical Society of the Pacific. 133 (1026): 084203. doi:10.1088/1538-3873/ac1ac0. ISSN 0004-6280.
- ↑ Brandt, Timothy D. (2021-06-01). "The Hipparcos–Gaia Catalog of Accelerations: Gaia EDR3 Edition". The Astrophysical Journal Supplement Series. 254 (2): 42. doi:10.3847/1538-4365/abf93c. ISSN 0067-0049.
- ↑ 5.0 5.1 Kervella, Pierre; Arenou, Frédéric; Mignard, François; Thévenin, Frédéric (2019). "Stellar and substellar companions of nearby stars from Gaia DR2: Binarity from proper motion anomaly". Astronomy & Astrophysics. 623: A72. doi:10.1051/0004-6361/201834371. ISSN 0004-6361. Record for this source at VizieR.
- ↑ Hümmerich, S.; Paunzen, E.; Bernhard, K. (2020). "A plethora of new, magnetic chemically peculiar stars from LAMOST DR4". Astronomy & Astrophysics. 640: A40. doi:10.1051/0004-6361/202037750. ISSN 0004-6361.
- ↑ 7.0 7.1 Jones, T. J.; Wolff, S. C.; Bonsack, W. K. (1974). "The Holmium AP star HD 51418". The Astrophysical Journal. 190: 579. doi:10.1086/152913. ISSN 0004-637X.
- ↑ Campos, L. M. B. C. (2011-01-11). "On magnetoacoustic-gravity-inertial (MAGI) waves - II. Application to magnetic and rotating stars: MAGI waves in magnetic and rotating stars". Monthly Notices of the Royal Astronomical Society. 410 (2): 735–761. doi:10.1111/j.1365-2966.2010.17552.x. Record for this source at VizieR.
- ↑ Balega, Yu. Yu.; Dyachenko, V. V.; Maksimov, A. F.; Malogolovets, E. V.; Rastegaev, D. A.; Romanyuk, I. I. (2012). "Speckle interferometry of magnetic stars with the BTA. I. First results". Astrophysical Bulletin. 67 (1): 44–56. doi:10.1134/S199034131201004X. ISSN 1990-3413. Record for this source at VizieR.
- ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. doi:10.1086/323920. Record for this source at VizieR.
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