HD 23089
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]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 mas[1] |
| Distance | approx. 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 | |
| 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 | |
| Database references | |
| SIMBAD | data |
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 Unpublished speckle observations suggest that the orbit is tilted towards the Earth's line of sight, and it has a relatively high inclination of about 87 degrees.[5]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
- 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- Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
- 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
- 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
- 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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