Astronomy:HR 3082
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 08h 04m 47.06842s[1] |
| Declination | +79° 28′ 46.6073″[1] |
| Apparent magnitude (V) | 5.39[2] |
| Characteristics | |
| Spectral type | A0p Si[3] or B9.5 IVs[4] |
| B−V color index | −0.040±0.002[2] |
| Astrometry | |
| Radial velocity (Rv) | +2.7±0.8[5] km/s |
| Proper motion (μ) | RA: −36.85[1] mas/yr Dec.: −53.27[1] mas/yr |
| Parallax (π) | 10.10 ± 0.24[1] mas |
| Distance | 323 ± 8 ly (99 ± 2 pc) |
| Absolute magnitude (MV) | 0.32±0.12[6] |
| Details | |
| Mass | 2.65±0.06[6] M☉ |
| Radius | 2.89[7] R☉ |
| Luminosity | 74+9 −8[6] L☉ |
| Surface gravity (log g) | 3.94±0.14[8] cgs |
| Temperature | 10,795±367[8] K |
| Rotational velocity (v sin i) | 30[8] km/s |
| Age | 36[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HR 3082 is a double star in the northern circumpolar constellation of Camelopardalis. It is faintly visible to the naked eye with an apparent visual magnitude of 5.39.[2] The system is moving closer to the Sun with a heliocentric radial velocity of +2.7 km/s.[5] It is currently at a distance of around 323 light years, based upon an annual parallax shift of 10.10±0.24 mas.[1]
The brighter component is a magnetic,[7] mild Ap star that displays an overabundance of silicon in its spectrum.[10] Cowley et al. (1969) listed a stellar classification of A0p Si,[3] while Abt and Morrell (1995) have it pegged as a subgiant star with a class of B9.5 IVs.[4] It has an estimated 2.65[6] times the mass of the Sun and 2.89[7] times the Sun's radius. The star is radiating 74[6] times the Sun's luminosity from its photosphere at an effective temperature of 10,795 K.[8]
The fainter component is a magnitude 9.6 star at an angular separation of 0.4″ along a position angle (PA) of 84°, as of 2009.[11] This is most likely a visual companion located along the same line of sight.[12] There is a magnitude 13.6 visual companion at a separation of 6.4″ along a PA of 169°, as of 2016.[11]
References
- ↑ 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, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C
- ↑ 4.0 4.1 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, Bibcode: 1995ApJS...99..135A.
- ↑ 5.0 5.1 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 6.0 6.1 6.2 6.3 6.4 Kochukhov, O.; Bagnulo, S. (2006), "Evolutionary state of magnetic chemically peculiar stars", Astronomy and Astrophysics 450 (2): 763, doi:10.1051/0004-6361:20054596, Bibcode: 2006A&A...450..763K.
- ↑ 7.0 7.1 7.2 Shulyak, D. et al. (September 2014), "Interferometry of chemically peculiar stars: theoretical predictions versus modern observing facilities", Monthly Notices of the Royal Astronomical Society 443 (2): 1629–1642, doi:10.1093/mnras/stu1259, Bibcode: 2014MNRAS.443.1629S.
- ↑ 8.0 8.1 8.2 8.3 8.4 David, Trevor J.; Hillenbrand, Lynne A. (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 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ "HD 49878". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+49878.
- ↑ Adelman, S. J. (September 1982), "Spectrophotometry of peculiar B and A stars. XII - HD 10783, 56 Tauri, HD 43819, 53 Aurigae, 49 Camelopardalis, HD 64486, HD 147550, HD 184905 and HD 192913", Astronomy and Astrophysics Supplement Series 49: 663–672, Bibcode: 1982A&AS...49..663A.
- ↑ 11.0 11.1 Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
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