HD 90089

{{Short description|High proper motion star in the constellation Camelopardlis}}

{{Starbox begin

| name = HD 90089

}}

{{Starbox observe

| constell = Camelopardalis

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| ra = {{RA|10|31|04.7079}}

| dec = {{DEC|+82|33|31.146}}

| appmag_v = {{val|5.252|0.009}}

}}

{{Starbox character

| class = F4 V kF2 mF2

| b-v = 0.37

| u-b = –0.05

}}

{{Starbox astrometry

| radial_v = {{val|7.9|0.9}}

| prop_mo_ra = –86.133

| prop_mo_dec = +19.832

| parallax = 43.4367

| p_error = 0.5983

| parallax_footnote =

| absmag_v = 3.60

}}

{{Starbox detail

| mass = 1.29

| radius = {{val|1.40|0.03|0.06}}

| luminosity = {{val|3.36|0.02}}

| temperature= {{val|6602|159|69|fmt=commas}}

| metal_fe = –0.26

| gravity = {{val|4.43|0.14}}

| rotational_velocity = 56.2

| age_gyr = 1.074

}}

{{Starbox catalog

| names = {{odlist|BD = +83°297|FK5 = 911|HIP = 51502|HR = 4084|SAO = 1714|HD = 90089|GJ = 392.1|WDS = J10311+8234A}}

}}

{{Starbox reference

| Simbad=HD+90089

}}

HD 90089 (HR 4084; Gliese 392.1) is a star located in the northern circumpolar constellation Camelopardalis. With an apparent magnitude of 5.25, it is faintly visible to the naked eye under ideal conditions. This star is located relatively close at a distance of 75 light years, but is drifting away at a rate of almost 8 km/s.

HD 90089 is an F4 main-sequence star with the calcium K-line and metallic lines of an F2 star. Although the spectral type is of a form that would indicate an Am star, it is not listed in any of the major catalogues of chemically peculiar stars. At present it has 1.29 times the mass of the Sun and 1.4 times its radius. It radiates at 3.36 times the luminosity of the Sun from its photosphere at an effective temperature of {{val|6602|fmt=commas|ul=K}}, which gives it a yellowish-white hue.

HD 90089's exact age depends on the method, with X-ray giving it a young age of only 300 million years. David et al. gave it an age of 1.1 billion years, significantly older than the previous solution; it spins rapidly with a projected rotational velocity of 56.2 km/s, and has an M0 companion separated 13" away and at approximately the same distance.

An infrared excess has been detected around this star, most likely indicating the presence of a circumstellar disk at a radius of 145 AU. The temperature of this dust is 30 K.

References

{{reflist|refs=

{{cite journal | last1=Renson | first1=P. | last2=Manfroid | first2=J. | title=Catalogue of Ap, HgMn and Am stars | journal=Astronomy and Astrophysics | volume=498 | issue=3 | pages=961–966 |date=May 2009 | doi=10.1051/0004-6361/200810788 | bibcode=2009A&A...498..961R| doi-access=free }}

{{cite journal |last1=Johnson |first1=H. L. |last2=Mitchell |first2=R. I. |last3=Iriarte |first3=B. |last4=Wisniewski |first4=W. Z. |title=UBVRIJKL Photometry of the Bright Stars |journal=Communications of the Lunar and Planetary Laboratory |date=1966 |volume=4 |pages=99–110 |bibcode=1966CoLPL...4...99J}}

{{cite journal |last1=Gontcharov |first1=G. A. |title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system |journal=Astronomy Letters |date=November 2006 |volume=32 |issue=11 |pages=759–771 |doi=10.1134/S1063773706110065 |issn=1063-7737 |bibcode=2006AstL...32..759G|arxiv=1606.08053 |s2cid=119231169 }}

{{cite journal | display-authors=1 | last1=Eiroa | first1=C. | last2=Marshall | first2=J. P. | last3=Mora | first3=A. | last4=Montesinos | first4=B. | last5=Absil | first5=O. | last6=Augereau | first6=J. Ch. | last7=Bayo | first7=A. | last8=Bryden | first8=G. | last9=Danchi | first9=W. | last10=del Burgo | first10=C. | last11=Ertel | first11=S. | last12=Fridlund | first12=M. | last13=Heras | first13=A. M. | last14=Krivov | first14=A. V. | last15=Launhardt | first15=R.| last16=Liseau | first16=R. | last17=Löhne | first17=T. | last18=Maldonado | first18=J. | last19=Pilbratt | first19=G. L. | last20=Roberge | first20=A. | last21=Rodmann | first21=J. | last22=Sanz-Forcada | first22=J. | last23=Solano | first23=E. | last24=Stapelfeldt | first24=K. | last25=Thébault | first25=P. | last26=Wolf | first26=S. | last27=Ardila | first27=D. | last28=Arévalo | first28=M. | last29=Beichmann | first29=C. | last30=Faramaz | first30=V. | last31=González-García | first31=B. M. | last32=Gutiérrez | first32=R. | last33=Lebreton | first33=J. | last34=Martínez-Arnáiz | first34=R. | last35=Meeus | first35=G. | last36=Montes | first36=D. | last37=Olofsson | first37=G. | last38=Su | first38=K. Y. L. | last39=White | first39=G. J. | last40=Barrado | first40=D. | last41=Fukagawa | first41=M. | last42=Grün | first42=E. | last43=Kamp | first43=I. | last44=Lorente | first44=R. | last45=Morbidelli | first45=A. | last46=Müller | first46=S. | last47=Mutschke | first47=H. | last48=Nakagawa | first48=T. | last49=Ribas | first49=I. | last50=Walker | first50=H. | title=DUst around NEarby Stars. The survey observational results | journal=Astronomy & Astrophysics | volume=555 | page=A11 | date=July 2013 | doi=10.1051/0004-6361/201321050 | bibcode=2013A&A...555A..11E | arxiv=1305.0155| s2cid=377244 }}

{{citation | last1=Reiners | first1=Ansgar | title=Rotation- and temperature-dependence of stellar latitudinal differential rotation | journal=Astronomy and Astrophysics | volume=446 | issue=1 |date=January 2006 | pages=267–277 | doi=10.1051/0004-6361:20053911 | bibcode=2006A&A...446..267R |arxiv = astro-ph/0509399 | s2cid=8642707 }}

{{cite journal |last1=Gray |first1=R. O. |last2=Corbally |first2=C. J. |last3=Garrison |first3=R. F. |last4=McFadden |first4=M. T. |last5=Robinson |first5=P. E. |title=Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I. |journal=The Astronomical Journal |date=October 2003 |volume=126 |issue=4 |pages=2048–2059 |doi=10.1086/378365 |issn=0004-6256 |bibcode=2003AJ....126.2048G |arxiv=astro-ph/0308182 |doi-access=free}}

{{cite journal |last1=David |first1=Trevor J. |last2=Hillenbrand |first2=Lynne A. |title=The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets |journal=The Astrophysical Journal |date=12 May 2015 |volume=804 |issue=2 |pages=146 |doi=10.1088/0004-637X/804/2/146 |issn=0004-637X |bibcode=2015ApJ...804..146D |arxiv=1501.03154 |doi-access=free}}

{{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 |date=December 2001 |volume=122 |issue=6 |pages=3466–3471 |doi=10.1086/323920 |issn=0004-6256 |bibcode=2001AJ....122.3466M |doi-access=free}}

}}

External links

[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%204084 HR 4084]
[http://aladin.u-strasbg.fr/AladinPreview?-c=10+31+04.6638%2B82+33+30.915&ident=NSV++4864&submit=Aladin+previewer Image HD 90089]

Category:Camelopardalis

090089

051502

Category:F-type main-sequence stars

4084

Category:Suspected variables

Category:Durchmusterung objects

Category:Am stars