HR 9038 is a triple star system located thirty-five light-years away, in the constellation Cepheus. Component A is a spectroscopic binary system with an orbital period of 7.753 days and a combined stellar classification of K3 V.[9] Component B is a red dwarf star that orbits the primary pair every 290 years.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 23h 52m 25.31799s[1] |
| Declination | +75° 32′ 40.5141″[1] |
| Apparent magnitude (V) | 6.40[2] (6.93 / 7.33)[3] / 11.4[4] |
| Characteristics | |
| Spectral type | K3 V[5] + K3 V[5] + M2[6] |
| U−B color index | 0.70[2] |
| B−V color index | 0.98[2] |
| R−I color index | 0.5 |
| Astrometry | |
| Radial velocity (Rv) | +4.60[7] km/s |
| Proper motion (μ) | RA: 341.01[1] mas/yr Dec.: 41.50[1] mas/yr |
| Parallax (π) | 91.82 ± 0.30 mas[1] |
| Distance | 35.5 ± 0.1 ly (10.89 ± 0.04 pc) |
| Absolute magnitude (MV) | 6.77 / 7.16 / ?[3] |
| Absolute bolometric magnitude (Mbol) | 6.34 / 6.62 / ?[3] |
| Orbit[8] | |
| Primary | HR 9038 A |
| Companion | HR 9038 B |
| Period (P) | 290.0 yr |
| Semi-major axis (a) | 4.14″ |
| Eccentricity (e) | 0.55 |
| Inclination (i) | 49.58° |
| Longitude of the node (Ω) | 93.91° |
| Periastron epoch (T) | 2015.0 |
| Argument of periastron (ω) (secondary) | 134.14° |
| Orbit[5] | |
| Primary | HR 9038 Aa |
| Companion | HR 9038 Ab |
| Period (P) | 7.7531 d |
| Eccentricity (e) | 0.0 |
| Inclination (i) | ~60[3]° |
| Periastron epoch (T) | 2420001.264 |
| Argument of periastron (ω) (secondary) | 0.0° |
| Semi-amplitude (K1) (primary) | 39.9 km/s |
| Semi-amplitude (K2) (secondary) | 49.7 km/s |
| Details[3] | |
| HR 9038 Aa | |
| Mass | 0.70 M☉ |
| Radius | 0.69 R☉ |
| Surface gravity (log g) | 4.60 cgs |
| Temperature | 4820 K |
| Metallicity [Fe/H] | -0.29 dex |
| HR 9038 Ab | |
| Mass | 0.67 M☉ |
| Radius | 0.66 R☉ |
| Surface gravity (log g) | 4.62 cgs |
| Temperature | 4620 K |
| Metallicity [Fe/H] | -0.29 dex |
| Other designations | |
| HR 9038 A: HD 223778, HIP 117712, HR 9038, SAO 10879 | |
| Database references | |
| SIMBAD | A |
| B | |
References
edit- ^ a b c d e van Leeuwen, F. (November 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- ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data.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 c d e Fuhrmann, Klaus (2008). "Nearby stars of the Galactic disc and halo - IV". Monthly Notices of the Royal Astronomical Society. 384 (1): 173–224. Bibcode:2008MNRAS.384..173F. doi:10.1111/j.1365-2966.2007.12671.x.
- ^ a b Malkov, O. Yu.; et al. (2012), "Dynamical masses of a selected sample of orbital binaries", Astronomy & Astrophysics, 546: 5, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774, A69.
- ^ a b c Pourbaix, D.; et al. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID 119387088.
- ^ "GJ 909 B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 7 May 2017.
- ^ 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. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
- ^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 2017-08-01. Retrieved 2017-05-07.
- ^ Allen, Peter R.; et al. (August 2012), "Low-mass Tertiary Companions to Spectroscopic Binaries. I. Common Proper Motion Survey for Wide Companions Using 2MASS", The Astronomical Journal, 144 (2): 12, arXiv:1206.4289, Bibcode:2012AJ....144...62A, doi:10.1088/0004-6256/144/2/62, S2CID 51051184, 62.
External links
edit- "ARICNS: 01943 (A)". ARICNS. Centre of Astronomy, Heidelberg University.
- "ARICNS: 01944 (B)". ARICNS. Centre of Astronomy, Heidelberg University.
- NStars: 2352+7532[permanent dead link]
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