Astronomy:HD 23089

From HandWiki
Short description: Spectroscopic binary star system in the constellation Camelopardalis
HD 23089
Observation data
Equinox J2000.0]] (ICRS)
Constellation Camelopardalis
Right ascension  03h 46m 02.33087s[1]
Declination +63° 20′ 42.1639″[1]
Apparent magnitude (V) 4.79[2]
Characteristics
Spectral type G2II-III + B9V[3]
U−B color index +0.24[2]
B−V color index +0.79[2]
R−I color index 0.53
Astrometry
Radial velocity (Rv)-2.4[4] km/s
Proper motion (μ) RA: -0.94[1] mas/yr
Dec.: -8.41[1] mas/yr
Parallax (π)4.08 ± 0.66[1] mas
Distanceapprox. 800 ly
(approx. 250 pc)
Absolute magnitude (MV)−2.70 + −1.50[5]
Orbit[5]
Period (P)6124 ± 3 d
Eccentricity (e)0.678 ± 0.003
Inclination (i)87 ± 4°
Periastron epoch (T)MJD 45850 ± 3
Argument of periastron (ω)
(secondary)
136.5 ± 0.6°
Semi-amplitude (K1)
(primary)
15.87 ± 0.08 km/s
Semi-amplitude (K2)
(secondary)
17.6 ± 0.34 km/s
Details
HD 23089 A
Mass5.0 ± 0.24[5] M
Radius41 ± 7.3[5] R
Luminosity1,150[5] L
Surface gravity (log g)2.88[6] cgs
Temperature5,250[5] K
Metallicity [Fe/H]−0.28[6] dex
HD 23089 B
Mass4.5 ± 0.21[5] M
Radius5.3 ± 0.9[5] R
Luminosity708[5] L
Temperature13,000 ± 300[5] K
Rotational velocity (v sin i)18[7] km/s
Other designations
BD+62° 604, HD 23089, HIP 17587, HR 1129, SAO 12891.
Database references
SIMBADdata

HD 23089 is a spectroscopic binary[5] star in the northern constellation of Camelopardalis. Based on stellar parallax measurements made by Hipparcos, the system is about 800 ly (250 pc) away from the Sun.[1]

The system consists of a cooler giant star and hotter main sequence companion.[3] The pair orbit each other every 6,124 days, on an orbit that is relatively eccentric, at 0.678. Unpublished speckle observations suggest that the orbit is tilted towards the Earth's line of sight, and it has a relatively high inclination of about 87 degrees.[5]

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode2007A&A...474..653V 
  2. 2.0 2.1 2.2 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode1986EgUBV........0M 
  3. 3.0 3.1 Parsons, Sidney B.; Ake, Thomas B. (November 1998), "Ultraviolet and Optical Studies of Binaries with Luminous Cool Primaries and Hot Companions. V. The Entire IUE Sample", The Astrophysical Journal Supplement Series 119 (1): 83–104, doi:10.1086/313152, Bibcode1998ApJS..119...83P 
  4. Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Carnegie Institute of Washington, D.C.), Bibcode1953GCRV..C......0W 
  5. 5.00 5.01 5.02 5.03 5.04 5.05 5.06 5.07 5.08 5.09 5.10 5.11 Griffin, R. E. M.; Griffin, R. F.; Stickland, D. J. (2006), "Composite spectra Paper 14: HR 1129, a long-period binary showing evidence of circumbinary material", Monthly Notices of the Royal Astronomical Society 373 (4): 1351–1368, doi:10.1111/j.1365-2966.2006.11110.x, Bibcode2006MNRAS.373.1351G 
  6. 6.0 6.1 McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series 74: 1075–1128, doi:10.1086/191527, Bibcode1990ApJS...74.1075M 
  7. Abt, Helmut A.; Morrell, Nidia I. (July 1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement 99: 135, doi:10.1086/192182, Bibcode1995ApJS...99..135A 

External links