HD 90089

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HD 90089
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Camelopardalis
Right ascension 10h 31m 04.6638s[1]
Declination +82° 33′ 30.915″[1]
Apparent magnitude (V) 5.252 ± 0.009[2]
Characteristics
Spectral type F4 V kF2 mF2[3]
U−B color index –0.05[4]
B−V color index 0.37[4]
Astrometry
Radial velocity (Rv)7.9 ± 0.9[5] km/s
Proper motion (μ) RA: –65.395[1] mas/yr
Dec.: +12.982[1] mas/yr
Parallax (π)43.9944 ± 0.2712[1] mas
Distance74.1 ± 0.5 ly
(22.7 ± 0.1 pc)
Absolute magnitude (MV)3.60[6]
Details
Mass1.29[7] M☉
Radius1.40+0.03
−0.06[1] R☉
Luminosity3.36 ± 0.02[1] L☉
Surface gravity (log g)4.43 ± 0.14[7] cgs
Temperature6,602+159
−69[1] K
Metallicity [Fe/H]–0.26[2] dex
Rotational velocity (v sin i)56.2[2] km/s
Age1.074[7] Gyr
Other designations
BD+83° 297, FK5 911, GJ 392.1, HD 90089, HIP 51502, HR 4084, SAO 1714, WDS J10311+8234A
Database references
SIMBADdata

HD 90089 (HR 4084 ; Gliese 392.1) is a star located in the northern circumpolar constellation Camelopardalis. With an apparent magnitude of 5.25,[2] it is faintly visible to the naked eye under ideal conditions. This star is located relatively close at a distance of 74 light years,[1] but is drifting away at a rate of almost 8 km/s.[5]

HD 90089 is an F4 main-sequence star with the calcium K-line and metallic lines of an F2 star.[3] At present it has 1.29 times the mass of the Sun[7] 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 6,602 K,[1] 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.[2] David et. al gave it an age of 1.1 billion years,[7] significantly older than the previous solution; it spins rapidly with a projected rotational velocity of 56.2 km/s,[2] and has an M0 companion separated 13" away.[8] 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.[2]

References[]

  1. ^ a b c d e f g h i j 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.
  2. ^ a b c d e f g Eiroa, C.; et al. (July 2013). "DUst around NEarby Stars. The survey observational results". Astronomy & Astrophysics. 555: A11. arXiv:1305.0155. Bibcode:2013A&A...555A..11E. doi:10.1051/0004-6361/201321050. S2CID 377244.
  3. ^ a b Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Robinson, P. E. (October 2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I." The Astronomical Journal. 126 (4): 2048–2059. arXiv:astro-ph/0308182. Bibcode:2003AJ....126.2048G. doi:10.1086/378365. ISSN 0004-6256.
  4. ^ a b Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  5. ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737.
  6. ^ Reiners, Ansgar (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, arXiv:astro-ph/0509399, Bibcode:2006A&A...446..267R, doi:10.1051/0004-6361:20053911, S2CID 8642707
  7. ^ a b c d e David, Trevor J.; Hillenbrand, Lynne A. (12 May 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: 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. ISSN 0004-637X.
  8. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.

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