HD 51418

{{Starbox image

| image=

{{Location mark

|image=Auriga IAU.svg|alt=|float=center|width=300

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=HD 51418

|x=254|y=328

}}

|caption=Location of HD 51418 (circled)

}}

{{Starbox observe

| epoch = J2000.0

| constell = Auriga

| ra = {{RA|06|59|20.12818}}

| dec = {{DEC|+42|18|53.1147}}

| appmag_v = 6.67

}}

{{Starbox character

| type =

| class = A0 SrCrEuDy, A0pEuSrCrMgII

| variable = α² CVn variable

| b-v = 0.09

| j-h = -0.087

| j-k = -0.037

}}

{{Starbox astrometry

| radial_v = {{val|−22.5|3.0}}

| prop_mo_ra = -1.210

| prop_mo_dec = −6.792

| parallax = 5.6092

| p_error = 0.0929

| parallax_footnote =

| absmag_v =

}}

{{Starbox detail

| source =

| mass = {{val|3.557|0.178}}

| radius = {{val|3.297|0.165}}

| luminosity =

| gravity =

| metal_fe =

| temperature =

| rotation =

| rotational_velocity =

| age_gyr =

}}

{{Starbox catalog

| names = {{odlist | AG=+42° 775 | BD=+42°1629 | GC=9158 | GSC=02950-01335 | Gaia DR2=951315950188279424 | TYC=2950-1335-1 | 2MASS=J06592013+4218531 | PPM=49494 | HD=51418 | HIP=33643 | SAO=41475 | TIC=192072521}}, NY Aur, Renson 14180

}}

{{Starbox reference

| Simbad = V*+NY+Aur

}}

HD 51418 (NY Aurigae) is an Ap star and an α² CVn variable located about {{convert|178|pc|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," with an overabundance of metals including europium, dysprosium, and holmium, which can be observed in the star's spectra as emission lines.

File:NYAurLightCurve.png for NY Aurigae, plotted from Hipparcos data]]

In 1972, Austin F. Gulliver et al. announced that HD 51418 is a variable star. It was given its variable star designation, NY Aurigae, in 1975. HD 51418 possesses a strong magnetic field, which fluctuates in strength between {{convert|-22|-|75|mT|G|lk=on}}. The magnetic minimum is known to occur concurrently with the minimums in luminosity and rare-earth detection.

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.

References

{{reflist|refs=

{{cite journal | last1=Bychkov | first1=V. D. | last2=Bychkova | first2=L. V. | last3=Madej | first3=J. | title=Catalog of averaged magnetic phase curves of stars: Second edition | journal=Astronomy & Astrophysics | volume=652 | date=2021 | issn=0004-6361 | doi=10.1051/0004-6361/202040215 | page=A31| arxiv=2004.14099 | bibcode=2021A&A...652A..31B }} [https://vizier.cds.unistra.fr/viz-bin/VizieR-5?-ref=VIZ66f2b9e021e8f9&-out.add=.&-source=J/A%2bA/652/A31/tablea1&recno=120 Record for this source] at VizieR.

{{cite journal | last=Brandt | first=Timothy D. | title=The Hipparcos–Gaia Catalog of Accelerations: Gaia EDR3 Edition | journal=The Astrophysical Journal Supplement Series | volume=254 | issue=2 | date=2021-06-01 | issn=0067-0049 | doi=10.3847/1538-4365/abf93c | doi-access=free | page=42| arxiv=2105.11662 | bibcode=2021ApJS..254...42B }}

{{cite journal |last1=Gulliver |first1=A. F. |last2=Macrae |first2=D. A. |last3=Percy |first3=J. R. |last4=Winzer |first4=J. E. |title=The spectrum and light variations in the peculiar A star HD 51418 |journal=Journal of the Royal Astronomical Society of Canada |date=February 1972 |volume=66 |page=72 |bibcode=1972JRASC..66...72G |url=https://articles.adsabs.harvard.edu/pdf/1972JRASC..66...72G |access-date=30 November 2024}}

{{cite journal |last1=Kukarkin |first1=B. V. |last2=Kholopov |first2=P. N. |last3=Kukarkina |first3=N. P. |last4=Perova |first4=N. B. |title=60th Name-List of Variable Stars |journal=Information Bulletin on Variable Stars |date=January 1975 |volume=961 |bibcode=1975IBVS..961....1K |url=https://ibvs.konkoly.hu/pub/ibvs/0901/0961.pdf |access-date=30 November 2024}}

{{cite journal | last1=Kervella | first1=Pierre | last2=Arenou | first2=Frédéric | last3=Mignard | first3=François | last4=Thévenin | first4=Frédéric | title=Stellar and substellar companions of nearby stars from Gaia DR2: Binarity from proper motion anomaly | journal=Astronomy & Astrophysics | volume=623 | date=2019 | issn=0004-6361 | doi=10.1051/0004-6361/201834371 | page=A72| arxiv=1811.08902 | bibcode=2019A&A...623A..72K }} [https://vizier.cds.unistra.fr/viz-bin/VizieR-5?-ref=VIZ66f2bd6c264319&-out.add=.&-source=J/A%2bA/623/A72/hipgpma&recno=33327 Record for this source] at VizieR.

{{cite journal | last1=Balega | first1=Yu. Yu. | last2=Dyachenko | first2=V. V. | last3=Maksimov | first3=A. F. | last4=Malogolovets | first4=E. V. | last5=Rastegaev | first5=D. A. | last6=Romanyuk | first6=I. I. | title=Speckle interferometry of magnetic stars with the BTA. I. First results | journal=Astrophysical Bulletin | volume=67 | issue=1 | date=2012 | issn=1990-3413 | doi=10.1134/S199034131201004X | pages=44–56| bibcode=2012AstBu..67...44B }} [https://vizier.cds.unistra.fr/viz-bin/VizieR-5?-ref=VIZ66f4a259333d70&-out.add=.&-source=J/other/AstBu/67.44/table1&recno=30 Record for this source] at VizieR.

{{cite journal | last1=Mason | first1=Brian D. | last2=Wycoff | first2=Gary L. | last3=Hartkopf | first3=William I. | last4=Douglass | first4=Geoffrey G. | last5=Worley | first5=Charles E. | title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog | journal=The Astronomical Journal | volume=122 | issue=6 | date=2001 | doi=10.1086/323920 | pages=3466–3471| bibcode=2001AJ....122.3466M }} [https://vizier.cds.unistra.fr/viz-bin/VizieR-5?-ref=VIZ66f4a057315ef7&-out.add=.&-source=B/wds/wds&recno=42930 Record for this source] at VizieR.

{{cite journal | last1=Pyper | first1=Diane M. | last2=Adelman | first2=Saul J. | title=Light Curve Changes and Possible Precession in mCP Stars | journal=Publications of the Astronomical Society of the Pacific | volume=133 | issue=1026 | date=2021-08-01 | issn=0004-6280 | doi=10.1088/1538-3873/ac1ac0 | page=084203| bibcode=2021PASP..133h4203P }}

{{cite journal | last1=Hümmerich | first1=S. | last2=Paunzen | first2=E. | last3=Bernhard | first3=K. | title=A plethora of new, magnetic chemically peculiar stars from LAMOST DR4 | journal=Astronomy & Astrophysics | volume=640 | date=2020 | issn=0004-6361 | doi=10.1051/0004-6361/202037750 | page=A40| arxiv=2005.14444 | bibcode=2020A&A...640A..40H }}

{{cite journal | doi-access=free | last=Campos | first=L. M. B. C. | title=On magnetoacoustic-gravity-inertial (MAGI) waves - II. Application to magnetic and rotating stars: MAGI waves in magnetic and rotating stars | journal=Monthly Notices of the Royal Astronomical Society | volume=410 | issue=2 | date=2011-01-11 | doi=10.1111/j.1365-2966.2010.17552.x | pages=735–761}} [https://vizier.cds.unistra.fr/viz-bin/VizieR-5?-ref=VIZ66f4b51323c4e&-out.add=.&-source=J/MNRAS/410/735/table4&recno=21 Record for this source] at VizieR.

{{cite journal | last1=Jones | first1=T. J. | last2=Wolff | first2=S. C. | last3=Bonsack | first3=W. K. | title=The Holmium AP star HD 51418. | journal=The Astrophysical Journal | volume=190 | date=1974 | issn=0004-637X | doi=10.1086/152913 | page=579| bibcode=1974ApJ...190..579J }}

{{cite journal

| title=The HIPPARCOS and TYCHO catalogues | author=EAS

| journal=Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission

| publication-place=Noordwijk, Netherlands | publisher=ESA Publications Division

| year=1997 | series=ESA SP Series | volume=1200 | isbn=9290923997

| bibcode=1997HIP...C......0E

| url=https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats

| access-date=15 October 2022}}

}}

Category:Ap stars

Category:Alpha2 Canum Venaticorum variables

Category:Auriga