HD 51418

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HD 51418
Auriga IAU.svg
Red circle.svg
Location of HD 51418 (circled)
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 [1]
J−H color index -0.087 [1]
J−K color index -0.037 [1]
Variable type α2 CVn variable [2]
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  mas [1]
Distance 581 ± 10  ly
(178 ± 3  pc)
Details
Mass 3.557±0.178 [5]   M
Radius 3.297±0.165 [5]   R
Other designations
AG+42° 775, BD+42°1629, Gaia DR2  951315950188279424, GC  9158, HD  51418, HIP  33643, SAO  41475, PPM  49494, TIC  192072521, TYC  2950-1335-1, GSC  02950-01335, 2MASS J06592013+4218531, NY Aur, Renson 14180 [1]
Database references
SIMBAD data

HD 51418 (NY Aurigae) is an 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 by 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 europium, dysprosium, and holmium, which can be observed in the star's spectra as emission lines. [2] [7]

Contents

A light curve for NY Aurigae, plotted from Hipparcos data NYAurLightCurve.png
A light curve for NY Aurigae, plotted from Hipparcos data

In 1972, Austin F. Gulliver et al. announced that HD 51418 is a variable star. [9] It was given its variable star designation, NY Aurigae, in 1975. [10] HD 51418 possesses a strong magnetic field, which fluctuates in strength between −22–75 milliteslas (−220–750  G ). [11] The magnetic minimum is known to occur concurrently with the minimums in luminosity and rare-earth detection. [7]

Visual companion

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. [12] [13]

See also

Related Research Articles

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References

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  2. 1 2 3 Bychkov, V. D.; Bychkova, L. V.; Madej, J. (2021). "Catalog of averaged magnetic phase curves of stars: Second edition". Astronomy & Astrophysics. 652: A31. arXiv: 2004.14099 . Bibcode:2021A&A...652A..31B. doi:10.1051/0004-6361/202040215. ISSN   0004-6361. Record for this source at VizieR.
  3. Pyper, Diane M.; Adelman, Saul J. (1 August 2021). "Light Curve Changes and Possible Precession in mCP Stars". Publications of the Astronomical Society of the Pacific. 133 (1026): 084203. Bibcode:2021PASP..133h4203P. doi:10.1088/1538-3873/ac1ac0. ISSN   0004-6280.
  4. Brandt, Timothy D. (1 June 2021). "The Hipparcos–Gaia Catalog of Accelerations: Gaia EDR3 Edition". The Astrophysical Journal Supplement Series. 254 (2): 42. arXiv: 2105.11662 . Bibcode:2021ApJS..254...42B. doi: 10.3847/1538-4365/abf93c . ISSN   0067-0049.
  5. 1 2 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. arXiv: 1811.08902 . Bibcode:2019A&A...623A..72K. doi:10.1051/0004-6361/201834371. ISSN   0004-6361. Record for this source at VizieR.
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  7. 1 2 Jones, T. J.; Wolff, S. C.; Bonsack, W. K. (1974). "The Holmium AP star HD 51418". The Astrophysical Journal. 190: 579. Bibcode:1974ApJ...190..579J. doi:10.1086/152913. ISSN   0004-637X.
  8. EAS (1997). "The HIPPARCOS and TYCHO catalogues". Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission. ESA SP Series. 1200. Noordwijk, Netherlands: ESA Publications Division. Bibcode:1997HIP...C......0E. ISBN   9290923997 . Retrieved 15 October 2022.
  9. Gulliver, A. F.; Macrae, D. A.; Percy, J. R.; Winzer, J. E. (February 1972). "The spectrum and light variations in the peculiar A star HD 51418". Journal of the Royal Astronomical Society of Canada. 66: 72. Bibcode:1972JRASC..66...72G . Retrieved 30 November 2024.
  10. Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (January 1975). "60th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 961. Bibcode:1975IBVS..961....1K . Retrieved 30 November 2024.
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