HD 23089

HD 23089
Observation data; Epoch J2000 Equinox J2000
Constellation	Camelopardalis
Right ascension	03h 46m 02.33087s
Declination	+63° 20′ 42.1639″
Apparent magnitude (V)	4.79
Characteristics
Spectral type	G2II-III + B9V
U−B color index	+0.24
B−V color index	+0.79
R−I color index	0.53
Astrometry
Radial velocity (Rv)	-2.4 km/s
Proper motion (μ)	RA: -0.94 mas/yr ; Dec.: -8.41 mas/yr
Parallax (π)	4.08 ± 0.66 mas
Distance	approx. 800 ly ; (approx. 250 pc)
Absolute magnitude (MV)	−2.70 + −1.50
Orbit
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
Mass	5.0 ± 0.24 M☉
Radius	41 ± 7.3 R☉
Luminosity	1,150 L☉
Surface gravity (log g)	2.88 cgs
Temperature	5,250 K
Metallicity [Fe/H]	−0.28 dex
HD 23089 B
Mass	4.5 ± 0.21 M☉
Radius	5.3 ± 0.9 R☉
Luminosity	708 L☉
Temperature	13,000 ± 300 K
Rotational velocity (v sin i)	18 km/s
Other designations
	BD+62° 604, HD 23089, HIP 17587, HR 1129, SAO 12891.
Database references
SIMBAD	data

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 Unpublished speckle observations suggest that the orbit is tilted towards the Earth's line of sight, and it has a relatively high inclination of about 87 degrees.^[5]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

^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600
^ ^a ^b ^c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
^ ^a ^b 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, Bibcode:1998ApJS..119...83P, doi:10.1086/313152
^ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l 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, Bibcode:2006MNRAS.373.1351G, doi:10.1111/j.1365-2966.2006.11110.x
^ ^a ^b 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, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527
^ 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, Bibcode:1995ApJS...99..135A, doi:10.1086/192182

External links

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[van_Leeuwen2007-1] ^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600

[MERMILLIOD-2] Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M

[apjss119_1_83-3] 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, Bibcode:1998ApJS..119...83P, doi:10.1086/313152

[gcrv1953-4] Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W

[Griffin-5] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l 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, Bibcode:2006MNRAS.373.1351G, doi:10.1111/j.1365-2966.2006.11110.x

[apjss74-6] 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, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527

[apjs99_135-7] 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, Bibcode:1995ApJS...99..135A, doi:10.1086/192182

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Observation data Epoch J2000 Equinox J2000
Constellation	Camelopardalis
Right ascension	03^h 46^m 02.33087^s^[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 (R_v)	-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 mas^[1]
Distance	approx. 800 ly (approx. 250 pc)
Absolute magnitude (M_V)	−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
Mass	5.0 ± 0.24^[5] `M`_☉
Radius	41 ± 7.3^[5] `R`_☉
Luminosity	1,150^[5] `L`_☉
Surface gravity (log g)	2.88^[6] cgs
Temperature	5,250^[5] K
Metallicity [Fe/H]	−0.28^[6] dex
HD 23089 B
Mass	4.5 ± 0.21^[5] `M`_☉
Radius	5.3 ± 0.9^[5] `R`_☉
Luminosity	708^[5] `L`_☉
Temperature	13,000 ± 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
SIMBAD	data